I bought this car with a ton of codes. Finally cleared them all, but now the car is idling at like 1800-2000rpm. No CEL, I’ve replaced the IAC three times. The factory IAC was shot, pep boys was making a hiss, and the Duralast seems okay... I cannot find any vacuum leaks, I cleaned the throttle body. IAC is showing 12v and TB showing 5v. And I already cleaned the MAF. I did notice if I unplug the IAC, I get absolutely no change in idle. Anyone have any ideas on what to look for next?
Idle stuck around 2k. Any ideas??
- Thread starter Miked232
- Start date
Hanging idle or just stuck at 2k?
Ac on or off?
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Ac on or off?
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Tuned? Vacuum leak?
Sounds like my 97 cobra,it would do that off and on. Then it quit doing it and I haven’t had an issue since.
To note,i’ve Been through just as many IAC’s myself.
To note,i’ve Been through just as many IAC’s myself.
Op, get the idle hanger plate off ebay; should help.
These blocks are notorious for the high idle syndrome.
When i crank ac, she gets high man
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These blocks are notorious for the high idle syndrome.
When i crank ac, she gets high man
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my I know 3 people with 3 different make/models and they all ran terrible on the duralast IAC, take that for whatever its worth. They all went back to OEM and it was fine
No AC In the car, prior owner did a delete. And I just replaced the TPS sensor, the idle leveled out at 1100rpm for maybeeee 30 seconds and then crept back to 1800rpm.
I’m not using the plate. But I did the gasket mod where you restrict the IAC to a 3/16th opening.
Also I haven’t vacuumed test. But I don’t hear anything and I tried probing around with propane and noticed no change to the idle
Oh ...and ford discontinued the IAC...
I’m not using the plate. But I did the gasket mod where you restrict the IAC to a 3/16th opening.
Also I haven’t vacuumed test. But I don’t hear anything and I tried probing around with propane and noticed no change to the idle
Oh ...and ford discontinued the IAC...
I was actually gonna check on there today. That’s my normal go to place or NAPA. And now with the duralast I’m also throwing p1506
Something simple. Original owner might have set the idle screw high to keep the car running since it had so many issues. Try adjusting the idle screw down and see if it can stay started.
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Mine does it occasionally, seems to have it's days. I was thinking I needed to do a seafoam treatment since mine sat a lot prior to me getting it. Let us know if that idle screw fixes it!
1800 RPM is where mine goes on a cold start. Have you checked both temps sensors in the crossover pipe? One runs the dash gauge and the other is an input to the CPU.
Do you still have IMRCs installed? One of the most common vacuum leak points on these cars is o-rings on each end of the IMRC butterfly connecting rods.
IMRC’s were left alone. The gaskets looked like they were in good shape. I’m borrowing a smoke machine from my friend on Thursday
Also gonna check the idle screw and temp sensors once I get home from work
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Best of luck. These kinds of issues can be a real pain to pin down, but perseverance usually wins out. Kudos for making the effort to bring a Cobra back to life.
I absolutely love this car. I wouldn’t sell it because of something so silly. The car has a ton of aftermarket parts.
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Yah..these are great cars, no lie.
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Well new update. Codes p1504 and 1506 showed up. I figured 1504 was because I was messing with the IAC, I cleared the codes and within 10 miles, 1506 reappeared. My idle is now sitting at steady 1800-2000rpm. I didn’t get to check temp sensors due to the rain, but idler screw seems okay.
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Both iac codes.
Stop playing around and get a new iac, stat
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Stop playing around and get a new iac, stat
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I cannot find a motocraft IAC anywhere. I’ve checked rockauto, 1aauto, Ford, etc. I’ve had my mechanic friends searching around as well.
is “Standard” brand any good? I see LMR sells them.
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