| Re: Overheated at the drive through Zoo |
Subject: Re: Overheated at the drive through Zoo by dan0617 on 2009/7/24 16:07:17 I just had a coolant temp sensor go bad on my '89. There is 1 for the computer and another one for the gauge. The gauge one was working fine. The car would start right up, but idled higher than normal. Would eventually stall out, then it was very hard to get restarted. What was going on is that the sensor that feeds the computer was telling the computer it was like -15 degrees out, so it was dumping tons of fuel into the car and idling high like it was trying to warm up. Never got a code thrown because -15 degrees is possible I guess. I have datalogging stuff so I hooked the car up to datalog to find out it was saying -15. But again, the dash gauge read just fine. The sensor is the one in the intake, and it cost $13 at Advance Auto. It could also just be debris between the radiator and condenser as mentioned before. Get that cleaned out first. The if the coolant temp sensor isn't bad and causing both your problems, then I'm betting you have a sticking or non-working IAC valve causing the idle rpm issue. Easiest way to check (as long as your AC works): warm your car up good, have it sitting idling in gear, turn the AC on. Idle should dip down, then recover back to at least where it was, maybe a hair higher. If the idle drops down a couple or few hundred rpms and does not recover or if the car stalls out, the IAC valve is either sticking or needs replaced. |
