Huge idle problem...

[mulot30th]

Okay, listen:

I perfectly matched my RAF table in order to get between -0.05 and 0.05 of stit about all time, but since my car is m6 converted to a manual body 700r4, pcm have no way to know its in gear, so when I shift it in gear, stit go up in the 2-3 range. But anyway, I just tried to run it that way and it was the poorest idle I ever got, so I changed back to my idle as it was at first and its 100% better but still need a stupid 1100 rpm idle.

I will repeat myself, but as soon as this stupid idle goes anywhere below 900 rpm ( for whatever reason) it just won't recover and will stall.

Shit, I has been able to tune this car to perfection on both Nitrous and N/A using a 2 bar sd tune at any throttle position, but.... Idle is getting me angry to the point I am no more wanting to run this car bcause it always keep stalling for absolutely no reason anywhere any time.

I am about to give up on this stupid idle thing and set it to idle at 2k rpm

[kindaslo]

9 times out of ten idle problems are mechanical in my experience..

At the risk of over simplifying things, have you done a smoke test for vacuum leaks?

[mulot30th]

No....

How to I do this smoke test?????


BTW... with timing in the 40deg range, at 1100rpm, it kinda acceptable... still nowhere like stock idle, but I could live with that if I had no other choice.

[Russ K]

If it was my car, I'd hook up an A4 park/neutral switch so the pcm knows if the trans in in gear or P/N. Then you can tune both rows of the RAF table.

Russ Kemp

[SSUte01]

You have two options as I see it, follow ^^^^ (and posted earlier by VYSSLS1) and wire in a P/N vs Gear switch or tune to the problem, if the problem is at it's worst then tune the RAF for in gear not P/N, the downside is the P/N idle wont be perfect but if anything it will be better than current setup IMO - that is assuming there are no vacuum leaks or similar.

Without the ability for the PCM to discriminate between P/N and gear every solution will have to a compromise.

I am not sure the correct pin to wire to or best method to approach it, but I am sure someone on here has done something similar.

[mulot30th]

If it was my car, I'd hook up an A4 park/neutral switch so the pcm knows if the trans in in gear or P/N. Then you can tune both rows of the RAF table.

Russ Kemp

Anyone know which wire should I look for?

Because I already hooked the clutch pedal switch that enable start of motor in neutral/park positions only.

Maybe I could just jump the two connections on the pcm together?

[7420NW7TH]

What kind of throttle body are you using?

[mulot30th]

stock but ported

Here is a pic: