Did a diagnostic.

IHateHacks · 01-28-2007, 04:18 AM

Code 22- Coolant temperature sensor signal

Code 25- (1988 California models only) Air-fuel ratio lean condition

Code 26- (1988 California models only) Air-fuel ratio rich condition

Code 52- Knock sensor signal

I would check the coolant temperature sensor's resistance. Should be 4-6K ohms at 32 degrees F. The resistance should go down as the engine warms up. At 212 degrees F it should be .17-.22K ohms. So check it when its ice cold then check it when its fully warmed up. You will have to remove the PS reservoir to get to the sensor. If the resistance doesn't change or is not in the ranges I specified, the sensor is bad.

You're on your own with the lean AND rich conditions. I would bet, since you said your not sure about the code 25, that it was 26 repeating twice and you missed a flash. That would make sense since a bad coolant temperature sensor usually defaults to completely rich (i.e. 20k ohms never changes).

And for the last code, your knock sensor or knock sensor circuit is bad. The TSRM doesn't show you how to check the circuit so I can't help you there.

01-28-2007, 04:18 AM	#4
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	Code 22- Coolant temperature sensor signal Code 25- (1988 California models only) Air-fuel ratio lean condition Code 26- (1988 California models only) Air-fuel ratio rich condition Code 52- Knock sensor signal I would check the coolant temperature sensor's resistance. Should be 4-6K ohms at 32 degrees F. The resistance should go down as the engine warms up. At 212 degrees F it should be .17-.22K ohms. So check it when its ice cold then check it when its fully warmed up. You will have to remove the PS reservoir to get to the sensor. If the resistance doesn't change or is not in the ranges I specified, the sensor is bad. You're on your own with the lean AND rich conditions. I would bet, since you said your not sure about the code 25, that it was 26 repeating twice and you missed a flash. That would make sense since a bad coolant temperature sensor usually defaults to completely rich (i.e. 20k ohms never changes). And for the last code, your knock sensor or knock sensor circuit is bad. The TSRM doesn't show you how to check the circuit so I can't help you there.