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06-02-2015, 06:21 PM
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#8 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: CEL Light on and off
The ECM in a 1989 has memory. It can store multiple codes at the same time.
The light does not need to be illuminated to read the trouble code/codes that are stored in the system. Because your truck is a 2500, it may have a different EGR system then most the 1500 trucks. There are multiple types of EGR valves. You need to know which kind of EGR it has. TBI trucks are generally Negative back pressure EGR or Port EGR systems, except California emission 4.3 TBI trucks had Linear EGR valves. The negative back-pressure EGR systems are very about the EGR valve you use. I have posted many times on these topics and you can find those posts with a search.
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For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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