High idle, ECMlink log included

[justinh722]

I haven't been able to get the car to idle normal since I got this 6 bolt running. It's currently in a 95 GST. I'm using PTE 1200 injectors and a walbro 255 pump with an AFPR. Fuel pressure is 43 psi. I had to basically up the sliders on MAF comp to get the car to idle, which idles too high and very lopey. If someone could please take a look at this log and give me some direction. I have my global at 62% and deadtime at 490.

 

[motozachl]

High idle is generally from a boost/vac leak, confirm this first. Also I'm not sure what that idle air tab does so try unclicking that check box, looks like it adjusts the idle air percentage

 

[justinh722]

I did a boost leak test a few days ago and it wouldn't hold any boost pressure. Tracked that to the intake gasket. I replaced that and fixed a couple more leaks but there was a small leak behind the TPS sensor. I don't know if that means throttle shaft seals or if it's the O-ring for the tps. I figured it being such a small leak that it wouldn't effect a whole lot. I have yet to do a boost leak test from the turbo. I'll give that a try today and see what I come up with. It just seems to be running a little rich to me. Thanks.

 

[nastyleak]

I don't think there is an o-ring on the TPS because its on the outside of the throttle shaft seal. When I took apart a 1G throttle body its seals were really bad. I've also found that replacing the TPS screws with allen head screws actually allows you to adjust or replace it 100x easier. Its also worth considering blocking off the FIAV which I did also with it off the car using better allen-hex screws which actually work and don't strip like the garbage wuss grade screws that came on there. Philips head screws are a garbage way to connect things IMO!

 

[motozachl]

Yes definelty do this before you start tuning or it will constantly throw it off. Your combFT at idle is way too low at -16% try to zero this in at idle using the mafcomp & adjusting the deadtime

 

[justinh722]

I have a 1990 throttle body so when I took off the TPS I could have sworn I seen an O-ring on there. good idea replacing the TPS bolts with allen heads since it's hard as hell to get to the bolts. I'm pretty sure you can only block the FIAV on the 91+ throttle bodies. One of these days I'll get around to replacing the shaft seals just for peace of mind. Thanks.

Yes definelty do this before you start tuning or it will constantly throw it off. Your combFT at idle is way too low at -16% try to zero this in at idle using the mafcomp & adjusting the deadtime

The hard part about that is I would be tuning for an idle of 1200 because I can't get it to go lower. I can't even set base timing because I can't get it to idle at the recommended RPM. I'm wondering if my MAS is going bad because dave over at ECMlink was saying the readings look off. I'm thinking about switching to SD. Prob the same price as a used MAS sensor.

 

[92AWDHX40]

Terry's Talon Troubleshooting Tips #3 - Fast Idle (aka. Idle Surge) basic idle i would start here.

 

[justinh722]

I tested all the coils in the ISC already and they all checked out fine. My EGR is blocked so that can't be it. I'll try a few things on that page and see what I come up with. Thanks.