surpra550 Posted May 9, 2011 Report Share Posted May 9, 2011 OK I just bought my first Tsi, right here on this website. It was the 89 Fiji blue with 55k on it. It has some minor bolt on mods. Under full throttle or normal driving, it seems to be ok. Once you level out or are feathering the throttle, the car loads up, smokes black smoke, and runs crappy. At first I thought is was lack of fuel. But today I rode behind the car and you could see the black smoke billow out. It also sounds terrible while it is loading up. I have no clue where to start. The seller told me about this but said he fixed it due to a bad vacuum line. That didn't seem to be the problem. Any help would be greatly appreciated!! Thanks in advance. Link to comment Share on other sites More sharing options...
NotStock88 Posted May 9, 2011 Report Share Posted May 9, 2011 please list mods that have been performed. Link to comment Share on other sites More sharing options...
surpra550 Posted May 9, 2011 Author Report Share Posted May 9, 2011 please list mods that have been performed.Maintenance:New NGK Plugs & WiresDistributor capVacuum advanceVacuum lines replacement and removal2nd air cleaner removalReplaced Strut isolatorsRepacked front bearingsRebuilt TBNew Injector clipsJet Valve Elimination KitNew Brakes front and rearNew o2 sensorBrake pads fron and rear Mods:Cross Drilled & Slotted RotorsStainless Brake LinesRising Rate FPR in stock locationStainless fuel line with pressure gauge on TB2.5” Turbo back *DM exhaust with MagnaflowPorted & Stressed Relived exhaust manifoldMBC set to 13psiAHP with K&N filter1st gen MAS1st gen BOVTB center removed from top part for better air flowKenwood CD playerManual Boost gauge in stock locationPowder Coated Valve cover with new gasket Link to comment Share on other sites More sharing options...
Hoosierquest Posted May 9, 2011 Report Share Posted May 9, 2011 Could be running on the secondary injector. Start the car and unplug the green injector, if it keeps running look else where. Could be a vacuum leak or dirty injector, leaky bov , hacked 1g MAS. I would check that bov after the injector. Link to comment Share on other sites More sharing options...
surpra550 Posted May 9, 2011 Author Report Share Posted May 9, 2011 Could be running on the secondary injector. Start the car and unplug the green injector, if it keeps running look else where. Could be a vacuum leak or dirty injector, leaky bov , hacked 1g MAS. I would check that bov after the injector.I will give it a try. Thanks! Link to comment Share on other sites More sharing options...
Indiana Posted May 9, 2011 Report Share Posted May 9, 2011 If that DSM BOV isn't modded it will leak nearly all the time. Google 1G DSM BOV mod to see the fix for it. The few psi extra past stock boost will put in too much fuel at low/mid rpms making it too rich. The spit and sputter is your misfiring fouled plugs when this is happening. What plugs you using? Link to comment Share on other sites More sharing options...
surpra550 Posted May 9, 2011 Author Report Share Posted May 9, 2011 If that DSM BOV isn't modded it will leak nearly all the time. Google 1G DSM BOV mod to see the fix for it. The few psi extra past stock boost will put in too much fuel at low/mid rpms making it too rich. The spit and sputter is your misfiring fouled plugs when this is happening. What plugs you using?Not sure about the plugs other than they are NGK. We have checked most of what you suggested but can't seem to nail the problem down. I will check into the BOV. Any more help would be appreciated. Thanks Bill! Link to comment Share on other sites More sharing options...
rockvilleash1976 Posted May 9, 2011 Report Share Posted May 9, 2011 The problem is in the BOV. The way i drove the car i never saw this issue except with steady throtle at 70 mph. I replaced the vac line to the BOV and it improved. Find a hard pipe and a BOV and it will be a non issue. Link to comment Share on other sites More sharing options...
rockvilleash1976 Posted May 9, 2011 Report Share Posted May 9, 2011 The plugs are NGK BPR7ES. They are not fouled i drove the car two hours to meet you in DC and my girlfriend followed me all the way. The car did not have any smoke. Most any car at WOT will smoke. You do have to remember this is a 22 year old car and if you beat on it you will break it. Link to comment Share on other sites More sharing options...
surpra550 Posted May 9, 2011 Author Report Share Posted May 9, 2011 The problem is in the BOV. The way i drove the car i never saw this issue except with steady throtle at 70 mph. I replaced the vac line to the BOV and it improved. Find a hard pipe and a BOV and it will be a non issue.What kind of BOV would you recommend??? Can I do anything to the BOV that is on it now to straighten it out??? Link to comment Share on other sites More sharing options...
surpra550 Posted May 9, 2011 Author Report Share Posted May 9, 2011 The plugs are NGK BPR7ES. They are not fouled i drove the car two hours to meet you in DC and my girlfriend followed me all the way. The car did not have any smoke. Most any car at WOT will smoke. You do have to remember this is a 22 year old car and if you beat on it you will break it. Well if wanted a car NOT be beat on I would have bought a K-Car! Lol...The smoking isn't at wide open throttle. It is under partial boost or feathering of the throttle. I just need some input on how to fix it. Can I just buy a different BOV and install it?? Or what if I just remove the BOV that is on it now?? Also the A/C was a broken fitting behind the Compressor, I didn't even need to add freon. Feedback appreciated! Link to comment Share on other sites More sharing options...
Hoosierquest Posted May 10, 2011 Report Share Posted May 10, 2011 If you can easily remove the bov then remove it and see if it cures your problem. Google search 1g bov mod it 1g bov crush. Link to comment Share on other sites More sharing options...
surpra550 Posted May 10, 2011 Author Report Share Posted May 10, 2011 If you can easily remove the bov then remove it and see if it cures your problem. Google search 1g bov mod it 1g bov crush.Thanks, will try it in the morning. Keep the feedback coming! Link to comment Share on other sites More sharing options...
Indiana Posted May 10, 2011 Report Share Posted May 10, 2011 You didn't look did you? http://www.thedodgegarage.com/turbo_bov_mod.html The smoke may be from crankcase pressure. That PCV valve from the dealer? That car have an oil separator on it? Link to comment Share on other sites More sharing options...
surpra550 Posted May 10, 2011 Author Report Share Posted May 10, 2011 You didn't look did you? http://www.thedodgegarage.com/turbo_bov_mod.html The smoke may be from crankcase pressure. That PCV valve from the dealer? That car have an oil separator on it?Thanks, checking it out now. Link to comment Share on other sites More sharing options...
rockvilleash1976 Posted May 20, 2011 Report Share Posted May 20, 2011 I removed the oil seperator. There is just an Air Filter venting the valve cover. When i had the car you could see the manual boost guage creep up to zero while at 70mph. When to manual boost guage hit zero that is when it would start to sputer. I just got used to it and watched the boost guage so I would accelerate or back off just a bit and the boost guage would drop back down the the vac side while at speed and the sputer would go away. I hope this info helps Supra 550 and you guys figure out what is going on. I crushed the 1st G BOV and checked it with a handheld vac guage. Link to comment Share on other sites More sharing options...
Indiana Posted May 20, 2011 Report Share Posted May 20, 2011 What that meant was before there was boost but the rpms were high that makes enough volume of the low pressure to the BOV to cause it to open and then it starts to puke because its way too rich with all that air blowing out. If you have the separator you might give it to him so he can put it back on. Link to comment Share on other sites More sharing options...
surpra550 Posted May 20, 2011 Author Report Share Posted May 20, 2011 Problem solved!! I removed the BOV and it accelerates perfectly!! Now the next big question....with running 14-15lbs of boost, do I need to bother reinstalling another BOV. Will there be any performance advantage?? Thanks for the input! Link to comment Share on other sites More sharing options...
rockvilleash1976 Posted May 23, 2011 Report Share Posted May 23, 2011 The seperator was included with the other removed stock items if you need it. i am glade to hear that the issue is corrected. The main purpose of the BOV is to take back pressure off the turbo between gears. it is a little more complex than that but for general purposes this is why most people use BOV's. It will extend the life of your turbo. You do not get any HP gain in reality it can hurt the over all performance if you dont route the air from the BOV back into the system. The mass air flow sensor has already accounted for that air and now it is out of the system. A lot of newer turbo car vent the bov back into the system and several guys have done the same thing on thier quest's. Link to comment Share on other sites More sharing options...
Shelby Posted May 25, 2011 Report Share Posted May 25, 2011 http://www.thedodgegarage.com/turbo_bov_mod.html if you read that link Indy gave you and do the mods it says to do,,your 1g bov will work fine but you MUST do the mods to it Link to comment Share on other sites More sharing options...
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