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09-13-2017, 05:22 PM | #1 |
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1996 GMC Jimmy SLT 4×4
Although the information states 1996, I believe that the motor may have been switched for the 95 or al the least the heads were changed for whatever reason. My clue was that whenever I would want to change the spark plugs the ones listed for the 96 were not the ones that fit. The plugs from the 95 had the proper length and thread depth and pitch.
So here is my dilema... Do I gap the plugs as if this was the 95 motor or do I gap the plugs for the specifications of the 96 ECM? |
09-13-2017, 07:20 PM | #2 |
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Re: 1996 GMC Jimmy SLT 4×4
Can you take a pic of the engine? There are major differences in the pre 96 engines(tbi or CPI) and the 96 and later engines. The cylinder heads are not interchangeable between the 2. The intake manifolds have different bolt patterns.
The 96 and newer call for platinum or iridium plugs. Never gap an iridium plug. It will chip and ruin it. Just make sure the plug wasn't dropped or damaged. |
09-13-2017, 10:12 PM | #3 |
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Re: 1996 GMC Jimmy SLT 4×4
What is it you want to know. It has a Single fuel injection spider, with a plastic upper intake manifold, the plugs that fit are the AC Delco 803, the plugs listed are like the 809 the entire motor was replaced pre ownership according to the previous owner.
Last edited by Cyphercrash; 09-13-2017 at 10:13 PM. Reason: Additional info |
09-14-2017, 05:12 AM | #4 |
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Re: 1996 GMC Jimmy SLT 4×4
There's no possible way for a 96 and newer intake manifold to bolt to 95 and earlier heads. Your motor must be a 96+. I'll look at some plugs when I get to work.
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09-14-2017, 06:05 AM | #5 |
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Re: 1996 GMC Jimmy SLT 4×4
I see 41-803 for a 95 and down, I see 41-979(double platinum) and 41-993(iridium) for 96+
So do the 96 plugs not fit? or did it have 95 down plug installed in it previously? Its possible the last person to due a tune up put the wrong plugs in it. |
09-14-2017, 10:26 AM | #6 | |
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Re: 1996 GMC Jimmy SLT 4×4
Quote:
The 41-803 is the only plug that fits the treads in the head. |
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09-14-2017, 10:28 AM | #7 |
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Re: 1996 GMC Jimmy SLT 4×4
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09-14-2017, 10:59 AM | #8 |
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Re: 1996 GMC Jimmy SLT 4×4
Can you take some pics of the motor? Especially of the intake manifold and bolts.
The 96+ intake manifold only has 8 bolts holding it down, and they are straight up and down. 95 and earlier have 12 bolts, and they are angled. Its not physically possible to put a 96+ intake on older heads. |
09-14-2017, 06:59 PM | #9 | |
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Re: 1996 GMC Jimmy SLT 4×4
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09-14-2017, 07:33 PM | #10 |
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Re: 1996 GMC Jimmy SLT 4×4
You are saying the entire motor was replaced and a vortec intake manifold was installed. I am saying that it's not possible to put a vortec intake on 95 heads.
The intake manifolds are different between 95 tbi, cpi, and 96 vortec. They bolt in differently and they look very different, and they inject fuel differently. R Posting pics is easy on this site. You can upload them from your computer or phone. No need to link them from a third party. |
09-14-2017, 07:48 PM | #11 | |
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Re: 1996 GMC Jimmy SLT 4×4
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09-14-2017, 08:18 PM | #12 |
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Re: 1996 GMC Jimmy SLT 4×4
Th first year for the plastic plenum intake is 96. You said that's the intake you have.
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09-14-2017, 09:15 PM | #13 |
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Re: 1996 GMC Jimmy SLT 4×4
Well, lets review the facts. The engine only accepts the 803 plugs. It has the plastic upper intake, is it possible that they drilled out the spark plug holes and Re tapped them for the other plugs? I'm just trying to figure the gap out.
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09-14-2017, 09:33 PM | #14 |
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Re: 1996 GMC Jimmy SLT 4×4
I am trying to find what the facts are. I am trying to figure out what kind of parts were used to put the engine together.
It's more likely that they re drilled the intake manifold. That's why I wanted to see pics. Just put the plugs in that fit. If you have the newer "crab" style distributor, you can gap them at .060". |
09-14-2017, 10:17 PM | #15 | |
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Re: 1996 GMC Jimmy SLT 4×4
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09-15-2017, 08:18 AM | #16 |
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Re: 1996 GMC Jimmy SLT 4×4
Then look at the last sentence in post 14.
I would like to help you find out what engine you have pieced together, but I cant do that without more info or pics. I am done posting in this thread until that happens. |
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