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1993 GMC s15 Jimmy Blazer W/4.3

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New User

Jun 24, 2010, 3:19 PM

Post #1 of 3 (3080 views)
1993 GMC s15 Jimmy Blazer W/4.3 Sign In

The check engine light came on two days ago and the engine has a little skip when its idleing and don't seem like it has all the power its supposed to have. Its not a bad power lose. I changed the plugs, wires, rotor button and distributor cap. Can anybody please tell me what the problem may be.

Hammer Time
Ultimate Carjunky / Moderator
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Jun 24, 2010, 3:29 PM

Post #2 of 3 (3072 views)
Re: 1993 GMC s15 Jimmy Blazer W/4.3 Sign In

The "check engine" light is an indicator for a system that monitors many electronic functions in the system, also called the "malfunction indicator lamp" (MIL). It can come on for any of hundreds of different causes from any of the systems that the computer monitors. Some are very important and can lead to further component or engine damage and some are emissions related not as serious but still a problem and need to be repaired.

Your first step is to have the computer scanned to retrieve the trouble codes that were set when the check engine light came on. Those codes will give you specific information about what the computer saw and will get you pointed in the right direction to find your problem. With a 1996 or newer and some 95 cars and you have an AutoZone or Advanced auto parts in your area, they will read them for free. Once you have these code numbers, we can be a lot more specific about what your problem may be.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
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Jun 25, 2010, 12:50 AM

Post #3 of 3 (3063 views)
Re: 1993 GMC s15 Jimmy Blazer W/4.3 Sign In

Thoughts on this:

Wiggles - you have the post about the defrost with A/C on and that would likely be the vacuum leak HT suggested. If source of vacuum was messed up other than just the one line that is more common it would be fooling an assortment of controls and capable of setting codes that won't just say "vacuum" leak.

Chase that down. The two issues together make a vacuum problem the likely cause of both,


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