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1-2-1 code came back, hmm 700 1990

posted by  invar on  Mon May 2 01:46 CST 2005
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last visit: Fri Feb 26 21:00 CST 2010
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Very strange. The car's performance seems to be just fine. I am wondering if the IAC is somehow triggering the 1-2-1 bad MAP sensor code. As far as I know, if the MAP sensor is not working, the car doesn't even run.

I disconnected the MAP sensor with the car off and tried to start it, and it doesn't start at all, just keeps cranking. Does anyone know if MAP sensors can go partially bad? When I tested it for functionality the other day, the voltage did go up and down based on the amount of throttle applied, so it would APPEAR to be working.

After resetting the check engine light yet again, the only codes now are 3-2-1 (cold start) and 2-2-3 (bad IAC). Ran it for a minute or two, gunned the engine a bit, and the 1-2-1 code is nowhere in sight. Very strange.

I guess I'll replace the IAC first and see if the other codes stop showing up.
--
Ken
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'






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