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ChevLoRay · 08-03-2010, 07:00 PM

It is quite possible. The 02 sensor samples the combustion gasses and, as an imput to the CPU, the CPU takes that information and other pieces of data and tells the engine what to do.

Do a search for code 42 and I am sure you'll find other information. If the SES/Check light comes on periodically, you can be sure that it is storing codes. Do a search for ALDL and you'll also pull up some information about that system and many tests that can be done to help determine the problem.

I was going to have some fun with your title and say, "If it is missing and running like crap, whoever took it will soon find out" But, that wouldn't be right, would it?

Hopefully, the search will help you with trouble-shooting. There are knowledgeable people on here who can offer you plenty of suggestions about how to trouble-shoot and what to look for.

08-03-2010, 07:00 PM	#2
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: 1990 chevy missing, runs like crap It is quite possible. The 02 sensor samples the combustion gasses and, as an imput to the CPU, the CPU takes that information and other pieces of data and tells the engine what to do. Do a search for code 42 and I am sure you'll find other information. If the SES/Check light comes on periodically, you can be sure that it is storing codes. Do a search for ALDL and you'll also pull up some information about that system and many tests that can be done to help determine the problem. I was going to have some fun with your title and say, "If it is missing and running like crap, whoever took it will soon find out" But, that wouldn't be right, would it? Hopefully, the search will help you with trouble-shooting. There are knowledgeable people on here who can offer you plenty of suggestions about how to trouble-shoot and what to look for. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. Last edited by ChevLoRay; 08-03-2010 at 07:03 PM.