Can anyone help me? Idle used to hold at 4k I lowered the TPS % to about 11% and now it's holding 2.5k and sometimes bouncing at 2.5k. If I cause the RPMs to go low they'll fall to about 1k and bounce up and down a few hundred RPMs and sometimes jump back up to 2.5k

Here's a log of my idle, It couldn't have anything to do with switching over to E85 could it? The problem started when I did my first logging pull after switching over to an E85 map.

 

Can you do a log with engine temperature as well? Your ISC steps are 70+. This will easily jack your RPMS up to those levels, but is normal during warmup.

 

Do this:

Ignition on, start logging TPS in EvoScan. Depress the gas pedal 100% and see if it logs 100%. If it does you should be okay at idle with zero throttle applied (roughly 13%).

Warm up car fully, (coolant ~180+). EvoScan>Speed Actuator Sensor>enable. Turn BISS screw to idle at ~750rpms. Deactivate SAS through EvoScan and set idle RPM through ECUFlash. You should no longer bounce idle erratically.


all of this is under the assumption you're on a stock unmolested TB.

HTH!

 

Probably shoulda stated I'm on the Skunk2 TB and have been for about 10k miles

I can't remember if that log was when the car was warm so I'll take another one

 

Sometimes with larger TB, they're not "supposed" to read 100% TPS when you're flooring it during the TPS test with IGN on (ie Boomba unit). They're meant to read ~96% in order to allow the same velocity of air to hold idle right.

 

Yea mine never reads 100 if the idle is 13% the floored % is about 95 I think. Where it is now its like 11-91

 

whats your low fuel trim ? log the trims/ o2 sensor volts/ o2 feedback and coolant temp

 

SO, I adjusted my TPS sensor to 12.5% and cleared the p0121 code. When I restarted my car the idle shot up to 4k and held there. I then went home and decided to log it. Upon restarting the car, the CEL came on again and the rpms shot up to 4K then dropped to 2.5k and started bouncing. It seems it idles lower but the idle surges when the TPS code is on. Is 12.5% still too low?

when the car idles and holds at 4k the AFRs are perfect at 14.7


and uhm, where does this go?


it's coming out of the wiring harness on the driver side of the valve cover. It looks like a ground that broke off

 

found pics of someone else's motor and it looks like that grounds to a bolt right above where it comes out of

 

thats ur ground for what looks to be your cam sensor, check under neath the cam sensor connector for a ground terminal that has wiring off it...at least thats what it looks liek to me, re solder wire back to it, reset battery and then check and see how it runs...

 

Correct that is the ground from the cam position sensor... get that fixed ASAP!