Question about 1990 Cadillac Deville
Code F48 is for low freon in the ac, and code F49 is for the computer turning off the ac compressor because the pressure is too high or the engine temp is too high. So neither code would have a direct effect on the engine running.
You may have to get a mechanic involved that can watch the data stream coming into the computer and check the exhaust gas to see if it is too rich or too lean.
Posted on May 09, 2013
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Posted on Jan 02, 2017
it sounds like the mass air flow metering sensor thats in the air intake pipe ,but any more than that iam at a loss as none of these cars here in spain so i cannot tell you exactly where to look
Posted on Jun 15, 2010
SOURCE: I have a 1991 Cadillac Deville with a V8. It won't pass smog. Has high co. I replaced the egr valve, charcoal canister, spark plugs, spark plug wires, cap and rotor, catalytic converter, oxygen sen
Hello! when you say you checked the MAP sensor what do you mean? Did you take voltage readings at idle ? A vacuum leak is the likely culprit, especially to the MAP...The minor shake at idle being the major clue...Send a comment...guru..saailer
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Posted on Dec 24, 2011
Are you getting fuel to the injectors and spark to the plugs ?
Any chance something is not hooked up, or the distributor was not re-installed correctly ?
Posted on Dec 13, 2012
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