techboy

Well ... I'm back to where I was before. Window worked great for few weeks and now it's stuck down again. I disassembled the switch again, but I didn't find any issues. I think it's the window regulator motor. I have to pull it out to test it for sure. Bad news is I checked Rockauto and they are NLA so I'm gonna have to find one somewhere if that indeed is the issue. Always something with this car, good thing I like it.

Installed. So far so good. We have headlights. 🙂

Amazing. What a slick looking color combo.

With the throttle shaft back in place we can begin to reassemble the lower portion of the TB. Before you do that though, make sure you have everything you need. I'd highly recommend you replace the majority of the hardware on the TB. I just ran out to Home Depot and picked up some grab bags in the metric section. Here's what I bought: You also want to pick up the GP gasket set I mentioned previously. And, you definitely want to pick up the FelPro version of the TB gasket as well. You can see the FelPro gasket on the right has a coating on that helps it to seal better. The one in the GP kit has leaked on me in the past and I've had to rip everything apart again. So, do it right the first time. Before we can use the gasket rebuild kit though, it was time to rewind the throttle spring. You want to slide the spring back on and make sure the little J-shaped hook grabs on the metal piece shown below. Then just simply wind until your painted-on line reappears. Here's that hook again from another angle. Once it's wound, put your 12mm back on and tighten down. With the spring rewound it's time to bust into that gasket kit and put the gasket that goes between the upper and lower TB sections in place. Now it's to tighten down the two halves. I used fresh M5 -.8 x 16mm Allen heads. Highly recommend, can easily be removed with a T-handle allen wrench later if need be. Plus, they look waaay nicer. Here's where we're at with our two halves back together and the spring back on. Next I reattached all the various brackets. I cleaned them up as best I could on my wire wheel first and then clear-coated them to prevent them from rusting. Some more of those new screws: Next I mounted the ISC back onto the housing using 5 new 8mm hex head machine screws. And here is the lower half rebuilt from two slightly different angles. The very last piece of all this to put our fuel top hat back together. I decided to send mine out to Chad here on the board to have it machined out for domestic injectors. Whether you do this or not, the process of rebuild is pretty much the same. In OEM form the top injector housing is a bit narrower and has screens down inside. Be careful not to damage the screens. Chad's modification machines this area out slightly and eliminates the screens. This is mine after having it powdercoated to match the rest of the TB assembly. First, we're going to start by installing the dampener diaphragm. You want to make sure you install this thing the right direction. There are 2 DIFFERENT sides to it. You want to install it so that side #1 is facing toward you like so: Next, there's an o-ring from your GP kit that goes on the cap. Find that and carefully slip it over. Hopefully you didn't misplace your spring, b/c we're going to drop that in next. Tighten everything down with an 8mm nutdriver. Now we're going to remount that Fuel Pressure Regulator (FPR). Here again I'm going to deviate from stock and install a Trilogy adjustable FPR. This particular unit mounts in the stock location though, so the process is the same. The 3rd option is you can pick up an adjustable FPR from FuelLab or Aeromotive or some other company like that and do a custom setup. There are two small gaskets in your kit that go on the FPR. You want to install them here and here: Reinstall in on the housing with the 3 8mm nuts and tighten everything down with your nut driver again. Now's its time to look at the injectors. Good stock injectors are getting harder and harder to find. Most of them have failed over the last 30 years, and many many many of them leak. If you want to chance it, you can send them out to be tested, but it cost money of course and there's no guarantee yours are good. Sometimes you can get lucky and find them F/S on the board here. Other options do exist. Trilogy and FIC make replacement Mitsu style injectors for these cars. They are often listed on eBay and can found on here as well. I believe I was told once the Trilogy injectors are just re-badged FIC's. You can even buy the injectors and FPR from Trilogy as a package deal. If you have your injector housing machined out, then you can run domestic injectors and have many more replacement options. I went with the latter of course b/c I had my housing modified to fit domestics. I will cover both OEM and Domestic injector installation next. I'll start with my Domestic Injector build first. I picked up these injectors from Verocious Motorsports. They are 95lb and 55lb injectors respectively. Chad provided the hardware and the two o-rings you see to the right in addition to the machining he did. You might remember at the top of this topic the first thing we did was remove those awful screws Mitsu had in there from the factory. Do NOT re-install them. Get a nice set of allen key screws M6 - 1.0 x 20mm is the OEM size. You'll need longer ones, maybe 25mm, with spacers if you go with the FIC's or Trilogy's. I believe Trilogy provides them if you buy from them. I also wrapped the corresponding "green" injector with green electrical tape just to make sure I installed it in the correct position. If you go with Domestic injectors, the lower two gaskets aren't necessary in this setup, so rather than risk them coming off on their own and ending up in the motor, remove them. All you need is the provided o-ring on the top that came with your injectors, and the o-ring seats provided by Chad. Gently push them down into the TB housing, and before you put the injector housing on, put some luby-lube on the o-rings. Now you can tighten down the injector housing with those new screws you got. You can see how the spacer makes up for the extra height of the injectors in this picture.

My relays showed up today. Yeah! I'll have to get them installed and let you know guys if this solves the issue.

rule of "looks about right" ... that's hysterical. Can't wait to see if this works for you. As long I've been on the board I've never seen anyone mock an intake up in that fashion before.

After getting everything deconstructed I sent my TB out to be cleaned and powdercoated. You may choose to do the same or just clean yours up. You can soak it in a bucket of Simple Green or Purple Power. I can tell you from personal experience spray painting it will not last. The first time you get a fuel leak at the feed or return line, or have leaky injectors all the paint will shrivel up and be ruined. It's up to you, but definitely clean it up a bit. In addition to cleaning, you are going to need new shaft seals, a throttle rebuild kit (I recommend the GP available through DAD), a FelPro TB gasket, and anything else you may be replacing or upgrading. I chose to replace the fuel pressure regulator with an aftermarket Trilology model and replacement injectors. First thing we want to do is install the new shaft seals on the throttle body. Get your throttle shaft and throttle plate. Everything I've ever read recommends the use of a 9/16th socket, so that's what I used to carefully tap the first one in. We're only putting one in at this time on the side opposite the TPS mount. Before I just slid the shaft back in through the new seal I wanted to be sure everything was nice and clean and free of debris. So I wiped it all down with denatured alcohol. I also used assembly lube on the shaft to help from accidentally tearing the new seal. Maybe not necessary, but I was being cautious. Next you want to placed the teflon washer back in it's place on the TPS side. Do this BEFORE you slide the throttle shaft back in place. And then very carefully slide the shaft back into it's home. The teflon washer should sit under the cir-clip. The whole purpose of this washer is to keep the clip from digging into the soft metal of the TB. This is what it should look like on the throttle cable side where we already tapped in the shaft seal. In order to tap the 2nd shaft seal in place you'll have to rig up some blocks of scrap wood or something. Otherwise when you stand it on end it'll be standing on the throttle shaft and you'll be tapping on that which you don't want to do. Grab your 9/16th socket and tap the 2nd shaft seal in place. With the shaft back in place with 2 new shaft seals it's time to put the throttle plate back in position. Pay attention to the markings you made previously. I used some Threadlocker Blue on the threads of the throttle plate screws to help hold them in place. I'm not sure if red or blue would be better, but this is what I had. I can tell you the 2nd day I took my JIS screwdriver and tried to gently back them out and they didn't budge. Coat the screws and twist them back in place. The screw heads will eventually face the down toward the motor, opposite of what they are in the this picture. I still need to spin the throttle shaft 180 in the next two photos. (You call tell if you have shaft spun correctly by looking at the notch on the shaft for the TPS. It needs to facing up otherwise the TPS won't mount on and you'lll be 180 out.) And that's the installation of your NEW shaft seals .... all back together. Next we'll reassemble the Throttle body.

The next thing we want to do is carefully remove the throttle spring. I would suggest taking some Testors paint and painting a line on the throttle spring so you can just match it up when you re-wind it. Beats having to count and all that. Remove the 12mm nut on the end and remove the linkages and the spring. You should be left with this. Before you take the throttle plate out, you want to label everything so it so goes back in the the proper orientation. I puts "B's" on the bottom for "bottom" and I used 3 lines to represent the side with the three vacuum lines on the TB. Now it's time to remove the butterfly screws so we can get the throttle plate out. I started by grinding off the staking on the backs of the screws. I used a small grinding bit in my dremel. Sorry the camera had a hard time focusing on this small item. Here's what it looked like for me. If you do this, be very careful to not nick up your throttle shaft too much. You can see I hit it in a few spots. More on that in a minute. You can see in this pic below that when I tried to remove the butterfly screw on the right w/ a regular screwdriver it started to cam-out immediately. So I stopped. They took a few weeks to show up b/c they literally came from Japan, but I ordered this set of JIS screwdrivers from Vessel. I highly recommend these as you'll find them useful for many other locations on the car. Once they arrived, I clamped the assembly down to my workbench with a wood clamp and grabbed my new screwdriver. Make sure you keep some downward pressure on the top of the driver. After a slight "pop", both of them spun right out. Once those two screws are out you should be able to slip the throttle plate out. Before you go ahead and slide the throttle shaft out, get out some emery cloth and lightly sand down the burs and scoring on the shaft so you don't do any damage while sliding it out. You don't want to score anything. Mine didn't move to well, it took a couple of light taps with a rubber mallet and it came right out. Once the shaft is out you want to immediately look for the teflon washer. Put that in a safe place till the rebuild. You'll now be able to remove the throttle shaft seals on each side. There's no need to try to save these on the way out, we're replacing them. I used a flat head screwdriver and popped mine out. And here's the whole entire reason we're doing this job in the first place. You can see that one of my shaft seals was totally shot.

Over the next couple of days I'll be putting the Throttle Body Rebuilt thread back together. I was able to salvage a lot of it from the Wayback Machine. I just have to reattached the pictures I think. At the time of the Wayback capture this had over 9,000 views, so I figured it would be a valuable one to resurrect. ~techboy This is a step by step tutorial on how to tear down and rebuild the throttle body including the replacement of the throttle shaft seals. For those of you who have looked through my restoration thread, many of these pictures are the same, however in this thread I will go into more detail of what and how-to, whereas in my restoration thread I glossed over some things. Hopefully this helps a few people out in the years to come. Tools required for tear-down are pretty straight forward. You'll need a phillips head screwdriver, an 8mm nut driver or socket and maybe a pair of needle nose pliers. First, let's assume that the throttle body is off the car. If it's not, you'll want to remove it to do this procedure. Mitsubishi was actually kind in this area in that all 4 of the 12mm bolts holding the TB to the manifold are accessible. However, you will need to remove the fuel lines (feed and return), a few coolant lines and some vacuum lines. And, of course, you'll have to disconnect a few wiring harnesses related to the TB. Once it's off the car and on your bench you should be looking at this: Depending on how often things have been apart on your car this very first step could be your most difficult and make you want to abandon doing this altogether. You need to remove to the top two screws pictured below. They can be really frozen in there and I've read horror stories of them shearing off trying to get them off. Hopefully that doesn't happen to you and they come right out. There's very little room to get vise grips or anything of the like in there so you might want to soak them in PB Blaster and wait 24 hours. I WOULD NOT recommend putting these two back in, we'll talk about that more later. Once those two screws are out, the "top hat", or the fuel injector housing, should pop right off, it's only pressed onto the injectors. Once removed it should look like this: First, let's disassemble the pulsation dampener. Remove the two screws holding the cover on. Once you open this up there will be an o-ring, a spring, and a diaphragm-type gasket that will be replaced later on in the rebuild. OPTIONAL: Depending on what you plan to do with your rebuild you may be interested in adding a fuel pressure gauge. There's a great little spot to do this on the back of the housing. All you need to do is remove this allen key plug. It might be tough to get out, a little heat may help here. Thread is a 1/4" BSPT (taper thread). Most fuel pressure gauges are 1/8" NPT. You can tap this out to just a 1/4" NPT at this time, and put a 1/4" to 1/8" reducer, or find a 1/4" BSPT to 1/8" NPT adapter (they do make these), or you can purchase other Earls-type fittings to change the position, angle, whatever you want. Getting back to our TB, it should now look like this with the top hat removed: Next up we're going to remove some of the wiring harness brackets so we can get the ISC off. Remove the 3 screws shown: The brackets will come right off with the screws removed. Set them off to the side. With the brackets out of the way we now have access to all the ISC screws. There are 5 total that you need to remove in order for it to come off. Once they are removed the ISC will "fold" over out of the way. It will still be attached by the long thin spring. Get your needle nose pliers and gently twist it out to fully remove the ISC. Removed. Set if off to the side. (NOTE: now is a good time to make sure this thing works. There are some FAQ tutorials, or your FSM, to explain how to test it. All you need is a 6V lantern battery and some wire.) If you haven't already, pop out the primary and secondary injectors. Make sure the bottom o-rings come with. You can set those off to the side too, more about them later. The last step to getting your TB tore down into it's basic pieces is to separate the TB halves. There are two screws left that hold it together. Once those screws are removed the top should lift right off... ... and you'll be left with this underneath.

I think by "T" shape he is referring to #3, the CTS. The prongs are arranged in a "T". You most likely need to replace sensor #1. That's you gauge sender to the cluster. If a new sensor does it fix it, trace the wiring and make sure there's not an issue with the physical wire.

Great little read there.

There's also some people, unfortunately, that just aren't on the boards at all. I know 4 people I can think of off the top of my head, all in my general area, with nice, show worthy, running Starquests. I know that sounds crazy for how rare these cars are, but only one of them has a screenname here and they're not an active poster. So, there's that too - some people just aren't into sharing what they know and contributing. I agree with what others have said too - we need to find a way to loose the ads here.

Throwing my 2 cents on here as well ... I think another thing that muddies the waters between here and FB is people don't always realize who each other is/are. For example, I'm on FB as well, but under my actual name. Here, I have a screen name I use on every forum. So, anytime you give advice or technical input on a forum it helps to have credibility, but I could be talking to someone like Texas or psu_ on FB and never know it. I'm not sure how that relates to driving more traffic here, but I do agree that the frequent crashes and then the ultimate crash really hurt. I felt like prior to that incident this board was very active. Honestly, I considered leaving after crash myself, but kev kinda inadvertently talked me out of it. So here I am.

Anything designed for a foxbody Mustang fits really well.

I just traced them. 😁 One would have to guess on the fillets a little bit, but the numbers should give anyone a rough idea.

So I finally had a chance to look into this a bit. This is my green fusible link ... I see no issues there. Looks pretty clean to me. I pulled the battery and removed the cover. Turns out the the headlight, taillight, power windows and defogger relay are all the same. I pulled headlight relay and the defogger relay (since I don't even drive the car in the winter). I swapped the defogger relay in for the headlights and checked - I have headlights. This is my headlight relay. If you can't see the numbers - it's an OMRON MB183865. I Googled that up and found a company in China on eBay that is still selling these for 3.99. So I ordered 4. Figured I replaced the headlight and taillight with new ones and keep the other 2 as spares. Here's the eBay link: RELAY I still can't be 100% sure I've solved the issue - time will tell, but I'm with psu_crash - I think it's the relay. These things are approaching 35 years old. If the issue crops up again I'll let you all know.

Did this for you today ... hope it helps.

I want to swap a rack in super bad as well. Probably one of the last LARGE scale projects on my list.

That post / info from Mike is very helpful. Thanks for copying that in. I looked up the relay - it's a RY51. I was going to take a look at it today, but didn't get that far, ran into some issues working on a different car. But I should be able to get to it tomorrow. Hopefully I'll get to the bottom of this and report back.

I'll check the green fusible link, although I replaced all those with new ones when I did the restore. Although - that was eight years ago already Definitely going to look into the relay and the contacts.

OK, so correction on my own post. The tree of relays that I tucked up by the coil does NOT contain the headlight relay - my memory was wrong. I was flipping the FSM tonight and realized it's under the cover right next to the battery - which is better in my case. I'm thinking this guy is the problem ...????

So, I've got my 2nd electrical question of the season. I'm having an intermittent problem this year where sometimes I have no headlights. To be clear, the pop-ups work just fine - they go up and down. Just sometimes the lights don't kick on. The first time it happened, the next day they worked fine. Last time it happened, I discovered a blown fuse on the horn, I replaced it and they started working - but I'm thinking that coincidence b/c I just can't see how the horn would be related to the headlights. I know there's that relay tree by the ignitor box that I think has a few related to the headlights - mine is tucked in the fender, so I'll have to take that all apart to investigate that if you guys think that's the culprit. There's nothing in the interior fuse box labeled headlights, and assume my console switch is good since they go up and down. Looking for your thoughts. ?? I did some searching, but all the results seem to be tied to someone whose pop-ups weren't opening.

Steve at Starquestparts sometimes has a set or 2 in stock. They are rare these days and very hard to find, but they do pop-up every now and then if you want to buy and original set. I can take measurements of my OEM ones when I get the chance and post up some photos.

Very nice. This car is virtually identical to mine with the exception of a difference of 30k miles.

Congrats and welcome to the club! What color is your car? How many miles? Cool that it's a Starion and not a Conquest - makes it a touch more rare I know you just graduated HS, so I'm sure $$ is not available by the buckets, but if you don't already, I'd suggest picking up something reliable for daily - like a Civic or Corolla (maybe you even already have a daily). Point is, these cars can be finicky and take some time and patience to get just right, so I don't want to see you get frustrated with it as a daily driver. Either way, you're at the right place. Tons of knowledgeable people here, and some who have owned these since new.