kazuma
10-24-2011, 12:24 PM
Hey guys I've run into sort of a weird issue and I am stuck at what it could be.
I had noticed that my car would go ridiculously rich(<10 afrs) sometimes and if I let off and go back on the gas it would disappear but lately it does it no matter what I do except if I were to go WOT it goes and sits at about 11.5-12 afr which it should do. so far I've done the following trouble shooting:
1.change out stock FPR for a aeromotive one, set the pressure to 40psi without vacuum and when vacuum is plugged in sits at 34psi. No difference at all
2. redid all grounds and added 3 additional ones. Much better lighting but still no difference
3. replace Coolant temperature sensor(not the gauge one but the ecu one). No difference
4. Checked for boost leaks. When I did this I found I had a boost leak right at the throttle body which I fixed but I also heard a very loud squeal from the back of the motor near where the head meets the block(bottom of intake manifold). At first i thought it was a the big o-ring that keeps the injector in and replaced it(it had a small rip anyways) but then I realized it wasn't that and I could actually feel air pressure from underneath the manifold.
I think the intake manifold gasket has to be replaced but I just wanted to get some other opinions before I did that(still have a stock manifold and it's a PITA to remove as you all know).
PS: the build is:
built ka24de(ross pistons, eagle rods)
stock head
650cc injectors/z32 maf/tuned ecu(chipped)
t3/t4 50trim turbo
thanks!!
I had noticed that my car would go ridiculously rich(<10 afrs) sometimes and if I let off and go back on the gas it would disappear but lately it does it no matter what I do except if I were to go WOT it goes and sits at about 11.5-12 afr which it should do. so far I've done the following trouble shooting:
1.change out stock FPR for a aeromotive one, set the pressure to 40psi without vacuum and when vacuum is plugged in sits at 34psi. No difference at all
2. redid all grounds and added 3 additional ones. Much better lighting but still no difference
3. replace Coolant temperature sensor(not the gauge one but the ecu one). No difference
4. Checked for boost leaks. When I did this I found I had a boost leak right at the throttle body which I fixed but I also heard a very loud squeal from the back of the motor near where the head meets the block(bottom of intake manifold). At first i thought it was a the big o-ring that keeps the injector in and replaced it(it had a small rip anyways) but then I realized it wasn't that and I could actually feel air pressure from underneath the manifold.
I think the intake manifold gasket has to be replaced but I just wanted to get some other opinions before I did that(still have a stock manifold and it's a PITA to remove as you all know).
PS: the build is:
built ka24de(ross pistons, eagle rods)
stock head
650cc injectors/z32 maf/tuned ecu(chipped)
t3/t4 50trim turbo
thanks!!