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So, it's been really hot here in Raleigh the past couple days, and I've had the return of a problem that was happening last summer. It only happens when it's extremely hot outside, i.e. about 90-95 degrees. Here's the scenario:
1. Engine has been running for maybe 10-20 min, it doesn't really matter except to say that it's up to normal operating temp.
2. Car is stopped for 2-10 min, i.e. going into a store.
3. When I come back out and try to start the car, it starts at normal idle speed but immediately the RPMs drop to 500 or so, I dunno how accurate my tach actually is, and it feels like it's about to stall. The CEL will be on, as well.
4. Giving it a little gas will either stall the car or get it back to normal idle speed, and the CEL will go off. If it stalls, it will take a few more tries and stalls before it idles fine for the rest of the drive, until the car is briefly stopped again.
To add to the confusion, this occurs regardless of whether the AC switch is on or off.
The code that is thrown is 1-2-1, Bentley calls this a "Fault in signal to/from air mass meter." I sprayed some CRC QD Contact Cleaner on the AMM connector, just for laughs; can't really tell if this has had any effect. I also tried running in limp-home mode, but this causes an immediate stall. I guess LH 2.4 cars don't have this ability? I know I could do it in my 88, (LH 2.2) even though it would confuse the transmission. I've yet to figure out why.
Yesterday I took the apparently non-functioning airbox thermostat out and used a piece of wire to hold the damper to always have fresh air coming in. It seemed to help slightly, but I still had the RPM drop today. Was I too late to fix this, and save the AMM, or is there another issue someone has dealt with before? I have a good junkyard source for 240 parts, so if I need an AMM it's not too much of a hassle, but I'd rather be sure that this is the problem before I throw $25 + gas money at it.
Again, any insight would be appreciated,
Drew
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