So for the last three weeks, off and on when I start the car for the first time that day, it just goes apey. Right off the bat the engine will rev to about 1200, then drop down below 500 and bounce up and down for a little almost stalling. One time it did I believe. Yesterday I fired it up to roll up to Volksfest and it spent about 3 minutes jumping between 800 rpm and 200 rpm.
I figured it was a bad tank of gas, but I'm on the third tank since it started. Once it settles down it runs just fine and I don't have any problems the rest of the day. Maybe it's just some moisture in the lines? I'm gonna go get some dry gas to run through, that won't hurt.
Any ideas? I'd like to narrow this down before I head up to APTuning on Wednesday to get chipped.
You probably want to run a throttle body alignment, it'll be good even if it doesn't solve the problem. If that doesn't work, you might have to clean your throttle body, maf, or injectors. That's where I'd start.
Make sure your foot isnt on the gas when you start it.. it will re-set the Idle to where ever you had it and it will wander trying to find the right place
Make sure you have 93 Oct and run you take till the light comes on
When was the last time you changed your spark plugs? they may not be firing right (Happened to me)
And check your MAF sensor and your air filter/ CAI filter
And if you have an aftermarket/ or even stock DV check the return connection (one closes to middle) if it is loose or disconnected it acts as a low grade BOV and dumps into your engine bay instead of your throttle body causing your car to run to rich making it have an erratic idle
it could be linked to one of these.... or a combination of both.... hope it helps
When you get the APR chip they should be able to fix your cold start issues.
If it isn't only when the car is cold its another problem. Talk to the guys at APT and they should be able to help you. I know Chuong (PCMoney01) had cold start issues with his APR Chip (I know your not chipped yet) but they were able to fix it for free.
Went out, fired it up, and it fell right on its face and stalled. Hit it again and it fired up perfectly normal.
Air filter's fine, it was just replaced not too long ago and I checked it. The wiring harness for the coils looked good from what I could see. It was in for its 20k service a month and a half ago (4000 miles) so all the carbon and stuff was cleaned out of it then. When it first started a few weeks ago it wasn't throwing codes, but I'll ask the guys at APTuning to scan it first and do a Throttle Body alignment.
I'm trying to be in denial about the MAF, even though I know they fail.
Even with the my APR updated version, I still experience cold start sometimes. Every morning when I try to start my car it would sputter up and down like it's about to stall. I'm thinking it might be bad gas from Rutters. I will replace the coolant temperature sensor with the green version to see if it works. I'll keep you inform.
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