Second Opinion(s) Please

[Paul T. Casey]

My hot rod is running pig rich when cold. Gets better as the car warms up. I'm leaning Idle Air Control. No CEL or codes (rear O2's off). Any other ideas?

[CBT]

My hot rod is running pig rich when cold. Gets better as the car warms up. I'm leaning Idle Air Control. No CEL or codes (rear O2's off). Any other ideas?

Funny you should mention this, I got in mine around 4:30 today to go to class. Turn the key, car turned over like a frickin Harley, BLAP BLAP shudder shake BLAP etc. etc. for a couple seconds. I left it run, but popped the hood. Maaaaan, a CLOUD of smoke followed me around to the front of the car and rolled out the garage. I mean it was eye-watering. But it smoothed out while I had the hood up. I eased down the street thinking "guess it's time to clean the MAF and stuff. Mebbe get plugs or COP's or both." Then I cranked up the Foreigner and went to class. All seemed normal, but I guess like you say, time to blast the IAC and MAF with some cleaner, may as well do the throttle body, too.

[Zack]

It could be the tune. The temp at which you started the car may be borderline of when it changes fuel table values and it got confused for a second.

[Got_1]

My hot rod is running pig rich when cold. Gets better as the car warms up. I'm leaning Idle Air Control. No CEL or codes (rear O2's off). Any other ideas?

It sounds like its taking too long to go into closed loop. I would get a scanner on it (find someone who has one) and view the O2 waveform. watch to see how long it takes to switch from 200mv to 800mv. if its more than 100ms then the sensors are scrap.

[Zack]

^^^what he said

[FordNut]

Mine was really rich when I cranked it up today. It hasn't been started in weeks, I'll try it tomorrow and see how it acts. Gotta be hell for tuners who put a car on the dyno in the heat of summer and tune them, then they act funky when it's 20 degrees.

[FordNut]

No help for the original question, but next day mine fired right up and ran like it's supposed to.

I'm very traction limited...

I do seem to have a tune issue, though. On the way home, I gas it and it immediately breaks the rear tires loose, then sets the CEL. Checked the DTC codes and there are 6 codes set. Left bank lean, Right bank lean, and 4 different coils misfired... I'm not sure, maybe the coils because it hit the rev limiter when the tires spun, maybe the lean codes because it was light throttle opening and hadn't gone into WOT fuel tables.

[Paul T. Casey]

Mine was bad yesterday, but seemed okay this morning. I'm a bit stymied, as air temps were similar. Ran it 50 to 130 on my "private track" with no problem, other than a little stiffness of my personal shifter.

[Pops]

Hey you are not supposed to take that pill before the work day begins!:D

[Paul T. Casey]

It sounds like its taking too long to go into closed loop. I would get a scanner on it (find someone who has one) and view the O2 waveform. watch to see how long it takes to switch from 200mv to 800mv. if its more than 100ms then the sensors are scrap.

Is this something that could be monitored on a dyno with wideband sensors? The local dyno guy has a special event this weekend for the hsvracing.com gang, which includes me.