My 99 vortec 5.7 STINKS, has a subtle miss but no Codes or CEL

[brycebba]

Great advice guys!! Thank you, any replies are helpful.

Is this the manual you mean? I have these if so in a box that I can get out

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[east302]

Yes, that’s exactly what you need. It has the step-by-step diagnostics for each code.

I’d start there.


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[brycebba]

Man, it might be worth using the online tool so I can search, I forgot how thick these manuals are.

 

[east302]

I have them in pdf, but it’s not an ideal format to find things easily. The alldata version is more user-friendly.


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[brycebba]

Yeah, I imagine so. I think I will try to check for shorts this afternoon or bad grounds and if that comes up with nothing then I will dig through. Since it was an engine swap, I know the ground points are different so it will take some digging around underneath the ol jeep. I hate working on cars when they NEED it, I like it when its optional lol

 

[Killjoy]

Are the 1998 manuals basically the same as the 99 models? Ive been looking for a set for my suburban

 

[brycebba]

As far as I understand they are. Someone respected on here told me it would be ok to buy 98 manuals for my 99 Yukon. Don't know if that's totally true or not

 

[east302]

It’s hard to read, but changes for 1999 Suburbans included radiator materials, different starter and revised seals in the 4L60e.

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I’d get the 99 if it’s available, but wouldn’t worry too much with getting a 98.


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[brycebba]

I was hoping for something painfully obvious as I crawled under the jeep today but nothing seemed out of whack. Large and small grounds seemed ok of the ones I checked. I did notice the main 12v terminal on the starter was kind of loose. I wiggled it all around and didn't see any place it was grounding out so I don't think that's my culprit. I just have to think these error codes and symptoms are the result of something ya know. A ground issue or shorting somewhere or a main cause like a malfunction in the computer which is very unlikely on its own. I just wish I knew what I was doing enough but I know that 8 codes with disassociated circuits don't just all appear at the exact same time right?

 

[Schurkey]

I know that 8 codes with disassociated circuits don't just all appear at the exact same time right?

If they're the sort of codes that require a specific drive cycle to set, sure they'll all appear at the exact same time--as soon as that drive cycle completes.



I have a '92 and a '93 Lumina. They're extremely similar vehicles. That said, the brake switches are totally different. Buying a '98 manual for a '99 vehicle will probably get you 98% correct information, but you'll never know which 2% is wrong.








My 1988 service manual for my 1988 K1500 was copyrighted in '86. It's so fukked-up they had to issue a "Service Manual Supplement" to correct the errors.