Thread: RPM's bounce while coasting

My crazy idle is back. Checked all vac lines, whatever line I pulled the engine reacted so its not vac leak from what I see.

Maf sensor? When I pull the maf plug it stops going crazy... Is this the problem?

Im not throwing a maf code though I only throw a p0102 when I unplug it. This is pissing me off. No one has any insight? Hidden vacuum lines, something I can show you with the aeroforce??? Anything?

Im testing rare's theory tonight with the overkill pcm. HVAC is the middle line on top of the s/c? What is the line thats off the evap by the brake booster.

see y'all have all these underlying problems. mine is supposed to be here on Wednesday, which gives me that night and two full days before Italy to see what it does. my car's fine it doesn't have any vac leaks or anything so i'll post to let yall know as well.

mine was fine to brandon. I had codes but it ran perfect. Now I cant get enough of it

0227122103 - YouTube my timing

0227122058 - YouTube fuel trims? driving low on top high on bottom

0227122100 - YouTube fuel trims on deceleration

THis was WITH overkills pcm installed this time.

Rares theory was put the overkill back in and drive with the maf unplugged. Upon first start up idle was finiky for about5 seconds then was normal the entire time while driving. No crazy bounce, wanting to stall I had when the maf was plugged in. Fluke or fact I dont know. I still had the deceleration bounce though as you see in the vids above. Im throwing in the stock pcm and returning this one.

I guess tmw I will run the stock pcm with maf unplugged and monitor the timing and fuel trims again and see how that goes.

Oh ya and with stock pcm my car gets off the line pretty good at 1800rpm. With overkills I need like 2500rpm and the exhaust is pretty loud.

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Brand new 02 sensor
RPM's? ROCK STEADY. Stock pcm not a hiccup bounce chug even when filling up with gas.
Ltft at a 40-45mph cruise in 3rd its between -3.9 / -5.4 depends on the road. Cant goose it with a 3.4 on a stock pcm but I see clicks off +.07 and 0.0 So I am pretty dam sure she is locked in ready to roll

I think a new code popped up p0104, google says maf? so maybe replace that? Otherwise twin egr faults(duh) and the abs/tc module thing. Yup so far the po131 is gone

2nd overkill pcm is in. So far all is well. (acceleration still kinda sucks, but we will see how that turns out next week)