importwarrior Posted September 20, 2015 Report Share Posted September 20, 2015 well for startersmodified 86 FIP TBi pro with ignition. problem is when driving normal there is no real boost.even floored it only makes 4 Psi maybe 5 under heavy load. things that have been done... new exhaust manifold gasket, studs, nuts, washers.manifold has been surfaced.new turbo TD06 20G, waste gate, turbine housing all new.checked all intercooler couplers and clamps tight.new manifold to turbo gasket.new turbine to down pipe gasket.vacuum when idling and under cruise is normal compared to my cars readings. air fuel ratios seem proper. what happened?:while driving the car before all the above was done it all of a sudden lost most like a coupler popped off.thought it was the turbo and after that found the exhaust manifold gasket needed repair. put in all new listed above and same exact symptoms. like a coupler popped of or has massive vac leak? tested intercooler from end to end and it is holding boat pressure no problems. don't know what else to check. maybe a clogged cat? no sign of leaks on intake or T body. it looks clean as new. can bad hydraulic lifters cause this problem? any suggestions would be great!!! Thanks! Link to comment Share on other sites More sharing options...
FijiPhil Posted September 20, 2015 Report Share Posted September 20, 2015 A clogged cat can def do what your describing. I'm assuming it's an aftermarket exhaust? Could you run just the downpipe and disconnect the rest of the exhaust? That should tell you if it was a car issue or not. Link to comment Share on other sites More sharing options...
jmactenn Posted September 20, 2015 Report Share Posted September 20, 2015 Have you checked the turbo itself to insure it fpins freely and compressor and exhaust wheels are not loose. I have seen one side net come loose and the other side doesn't spin as fast. Link to comment Share on other sites More sharing options...
speedyquest Posted September 20, 2015 Report Share Posted September 20, 2015 Another thing to check if your still internal wastegate is that your flapper is sealing properly. I'm having an issue with mine right now as well something similar to what your describing except that sometimes it seats well and seals, other times it sits oddly and will leak not allowing for fast boost building and once in awhile a lack of any real boost. In my case I need a new hotside I think. Link to comment Share on other sites More sharing options...
importwarrior Posted September 20, 2015 Author Report Share Posted September 20, 2015 turbo spins great and is brand new. i know that does not mean it could have a problembut the new turbo has the same problem as the old one did. no boost past 4-5 psi.. clogged cat is welded on. the exhaust is 2 1/2 inch from the turbo back to 3 inch muffler.no way to see cat unless i cut it out..... I can remove the entire exhaust and go for a test spin. will try it out. waste gate flapper was getting stuck open but cleaned up the flapper area and now it opens and closes properly. thank you for all the help suggestions. Link to comment Share on other sites More sharing options...
slydogg Posted September 20, 2015 Report Share Posted September 20, 2015 exhaust is fairly new, total rebuild by machine shop,less the 8000 miles unless scott is logging a lot. there is an ebc that is wired in. just needs to be hooked up to wastegate. hose leak or wastegate is all i got. i assume that is my ex you are asking about. i'm still in love with her so be gentle. Link to comment Share on other sites More sharing options...
importwarrior Posted September 21, 2015 Author Report Share Posted September 21, 2015 The car is amazing. many mods for sure. taking my time doing things proper.nothing but TLC here. just running out of options on this issue. seems like a hole in the intercooler or vac hose came off somewhere. I'm sure it is something i am missing. Link to comment Share on other sites More sharing options...
StarquestRescue Posted September 21, 2015 Report Share Posted September 21, 2015 Plumb a pressure gauge in to the o2 sensor bung and report back. 2" exhaust is 1/2 a plugged exhaust to begin with. Link to comment Share on other sites More sharing options...
importwarrior Posted September 21, 2015 Author Report Share Posted September 21, 2015 great idea will report back. Link to comment Share on other sites More sharing options...
slydogg Posted September 21, 2015 Report Share Posted September 21, 2015 it's 2&1/2 in. exh. Link to comment Share on other sites More sharing options...
importwarrior Posted September 21, 2015 Author Report Share Posted September 21, 2015 oops i missed the 1/2 part on my original post. the car has a new paint job, i got the Tach working great.car runs good just short on boost. Link to comment Share on other sites More sharing options...
slydogg Posted September 24, 2015 Report Share Posted September 24, 2015 any boost yet ? Link to comment Share on other sites More sharing options...
SunbirdGTO Posted September 24, 2015 Report Share Posted September 24, 2015 No, not yet. I am going to take it to a local turbo shop for a boot leak test next week. And a leak down test if necessary. Just a thought, any chance the clutch could be slipping? Link to comment Share on other sites More sharing options...
freebird Posted September 24, 2015 Report Share Posted September 24, 2015 eliminate the bov? Link to comment Share on other sites More sharing options...
importwarrior Posted September 24, 2015 Author Report Share Posted September 24, 2015 Sunbird GTO is the owner and as stated it is going to a shop for boost leak test and a leak down test. Link to comment Share on other sites More sharing options...
slydogg Posted September 25, 2015 Report Share Posted September 25, 2015 No, not yet. I am going to take it to a local turbo shop for a boot leak test next week. And a leak down test if necessary. Just a thought, any chance the clutch could be slipping? clutch is new but stock,very good chance it is slipping. i have an act clutch and pressure plate i was going to install. Link to comment Share on other sites More sharing options...
importwarrior Posted September 28, 2015 Author Report Share Posted September 28, 2015 Tested the clutch 4 th gear pull from 24 to 30 MPH step on gas and Car rpm's climb with speed. Stoped put car in 3rd tries to start as if in first gear. Car would stall if I didn't press the clutch in. Tested the waste gate and it opens and closes no issues. Checked compression and it is high 135 plus across. All cylinders. Still need to test exhaust pressure. Need to drop exhaust with downpipe only to see If it makes a difference Link to comment Share on other sites More sharing options...
Starfighterpilot Posted September 29, 2015 Report Share Posted September 29, 2015 No, not yet. I am going to take it to a local turbo shop for a boot leak test next week. And a leak down test if necessary. Just a thought, any chance the clutch could be slipping? Just a suggestion on saving yourself some money that is probably just as good as doing a boot leak down test (what I'm assuming is the intake accordian intake boot between the intake filter cannister & the Turbo inlet). Remove the 'boot" and look at it entirely while flexing each of the ripples's peaks & valleys using a magnifying glass. See any cracks, splits etc.especially in the valleys? Then look at the inside of the hose ends to see if they are frayed, delaminated, cracked etc. None - OK. Then reinstall the intake boot and start the engine. Have someone monitoring the tac RPM while you flex the boot as you're spraying starter 'fluid" on each boot wrinkle and joint. If RPM's increase as you spray then you found your leak. If no RPM increase then remove all of the hoses going to & from the intercooler and do the same thing. Still no evidence of leakage? The remove the OVCP and check it is 'rubber" connectors the same way as above. I've found that the weak link in the Starquest's inlet tubing is the rubber hose connection between the OVCP and the TB inlet. Over the years I've found that 2 of them in the Old Broads life, developed cracks in 'em. Never could figure out why they went FUBAR in just that particular location. Then remove and visually check your intercooler for evidence of it's cooling tubing (between the fins) having hples, dings or cracks caused by road debris. For suspect areas, ya might want to check it using the starter fluid while monitoring engine Tac RPM's. also. Just some thoughts from a Dirty Old Man who's gone through what you are going through. For What It's Worth. KEN PS SAFETY ISSUE - make sure that you have a fan indirectly blowing across the engine house while your spraying the starter fluid cuz it may put you asleep - like RIGHT NOW CUZ IT'S ETHER!! Link to comment Share on other sites More sharing options...
importwarrior Posted September 29, 2015 Author Report Share Posted September 29, 2015 Ovcp to TBody is a new 4 ply coupler. He car has no mas sensor do to the TBi pro from FIP. It has a MAP sensor. Need to remove cat and check it for flow. Link to comment Share on other sites More sharing options...
DSMracespeed Posted September 30, 2015 Report Share Posted September 30, 2015 wastegate actuator may be bad/weak or made for low boost. Jerry L. Link to comment Share on other sites More sharing options...
importwarrior Posted September 30, 2015 Author Report Share Posted September 30, 2015 the car started doing this and we replaced everything and found a few new things as we went along.made lots of repairs and fixes. replaced the turbo with a whole new turbo including turbine housing and wategate.pressure tested the wastegate and it appears to be opening properly. at least functioning and moving smooth.original boost controller was set to 10PSi. put a brand new hallman boost controller on it because we thoughtit might be the problem did not make a difference. thursday the 8th will be when we check exhaust and cat. Link to comment Share on other sites More sharing options...
Edde Posted October 3, 2015 Report Share Posted October 3, 2015 Reminds me of this happening to jonboyb some years ago. Don't know how it was resolved and can't seem to find the thread. Any chance the timing is off a tooth? Link to comment Share on other sites More sharing options...
importwarrior Posted October 3, 2015 Author Report Share Posted October 3, 2015 Great question. Seem to idle perfect. Drives great just when boost comes on nothing. Will check it Thanks for the help. Link to comment Share on other sites More sharing options...
slydogg Posted October 5, 2015 Report Share Posted October 5, 2015 only thing not new on that car was the air filter, i'm gussin' that has been replaced. don't make me drive down there. she may just miss me !!!. Link to comment Share on other sites More sharing options...
importwarrior Posted October 6, 2015 Author Report Share Posted October 6, 2015 Need all the help I can get.Probably home sick.Thursday will be another attempt to figure out this problem.Removing exhaust for a test drive downpipe only among other things. Link to comment Share on other sites More sharing options...
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