ok here's the problem. i have a 91 t2 motor in a 90 gtu. for awhile now i have been having problems with the car. backfire issue etc...not being able to get any boost, car ilding to high around 2.5-3k rpms. and today i replace my vac line and after that i doulbe check everything, but now it wont stay running, it will backfire and then die. anyone help plz..

 

ah sounds just like mines. only thing I can say for now is
...better learn to use the search button!

but yea your problem sounds pretty close to mines, but mine is a 90 turbo non swap
it idle's high and lack of boost, I'm in the process of replacing all my vac lines and I'm looking for a new tps unit.

might wanna check your tps to see if it's adjusted right and make sure to follow the tps guide to the T or you'll screw up like me haha

 

thanks, but if i adjust the tps without the engine being warm will it make a difference so i could then crank it and warm it up and then readjust?

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/tps-testing-gone-bad-726992/page2/

look a few posts down. and there is a way to adjust the tps with the engine being cold

I just did what you did also, adjust the tps while the engine was cold and it was never the same again, but today like a few hours ago, I warmed up the car and attempted to adjust the tps again and found out I had a bad tps (well I hope it is)

 

i hope you swapped ecu's too.

 

well i brougth the car with the swap, i think it has the t2 ecu. thanks for the info, but keep it coming.

 

Did you check your plugs? Check for any loose or accidentally disconnected vacuum lines? Are you sure you got a good seal on your manifold flanges? Were you sure to connect your AFM back? Because that will cause this problem specifically.

Also, make sure the fuel lines are routed properly.

 

afm is the mass air flow meter rite? just making sure. well guess i'm gonna take off the manifold again just to make sure everything on rite. damn it. this car been giving me hell. oh well i love the car so gota do what i gota do. again thanks ya

 

where the hell is the afm??

 

dangit, my manual is out in the car, and i don't feel like going outside to get it right now. hopefully i'll check this thread in the morning and, if you still haven't checked the afm, i'll post its location

where you at in nc?

 

i'm in greensboro jord4n, well i check and check the vac lines and still i cant seem to get it to stay on. it will crank easy but just wont stay on, could bad plugs cause this, i just replace them the other day. i took off the fliter and press the mass air flow down and it will stay on but ildes high and lots and lots of white smoke comes out, it doesnt smell like old but fuel. take my hand off it idles high still. dont press in mass air flow, car wont stay on. help help...plz ...plz.

 

ok about to give up. will bad comp cause this problem? i check the compit seems good but again i'm new to this so can really tell.

 

when adjusting tps let the car warm up

 

wait, white smoke...can you smell the smoke? it *could* be coolant leaking into the chamber(s), and perhaps that'd keep the car from running unless you kept on the throttle?

 

no i smell fuel. even though it's white smoke. only happens when i press in the afm in. and it will stay on but idles high and rough

 

where is the afm? is it in the intake box? I'd double check to see if it's hooked up to the box also!

 

nevermind found the afm, mine is intergrated with the intake box? that's really different from a s4 heh

 

intercooler piping loose?

 

can loose pipes cause this? i havent check my intercooler pipes yet.

 

yea, when you pop one it will start and immediately die. It's happened to me a couple of times.... damn worm gears!

 

i'll check those when i get back home this weekend. but whats strange is that the same day the car was running, i replace the vac lines, and then it wont stay on. haven't given it any boost since i had the car.

 

hmmmm i would double check all your vac lines then too, especially the big ones, maybe you missed one. Did you have to remove any intercooler piping to get all those vac lines?

 

hmmm, well i check and check all of my vac lines a few times but the only thing i took off was the top part of the manifold. and i didnt tighten the pipes coming from the fmic into the throttle body. was that the issue? since the car was running like 2hrs before?

 

that'd be my bet, you gotta tighten those suckers down or it's just a GIANT vacuum leak

 

thanks tex, only if i had my car here with me i'll check to see if thats the problem, but i left it back home urghhhhhh.