Variable camshaft issue?

TAHOE'N_IT

MEMBER
1998 CHEVROLET TAHOE
5.7L
V8
4WD
AUTOMATIC
370,000 MILES

One day I stopped at a gas station, and it wouldn't start once I was done pumping gas. No noises or odd symptoms beforehand. Codes referred to an issue with the VVT solenoid and that both bank 1 and 2 were too lean. It cranks but acts like there's no spark. I wanted to test the camshaft position sensor to start with but have not been able to find it or the VVT. I've searched online and can't find a good picture or reference. Thanks for any help.

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,896 POSTS

Hi,

The camshaft position sensor is located at the top rear of the engine (see picture below). This vehicle doesn't have variable valve timing solenoids.

The lean fuel mixture on both sides could be a few things. I need you to try something. See if the engine will start if you use starting fluid. If it does and then stalls, it sounds like the fuel pump has failed. If that isn't the case, I need you to check for ignition spark.

Here is a link that explains how it's done:

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Let me know what you find.

Joe

See pic below.

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Sunday, November 17th, 2024 AT 9:22 PM

TAHOE'N_IT

MEMBER
2 POSTS

So it wouldn't start with starting fluid, and I checked for spark which there was. I located the CPS and replaced it. When I went to start it, it started right up so I gave myself a pat on the back and went to bed. This morning it started right up but when I got a mile or two from the house and the engine started to warm up it died while I was driving and won't start again. Not sure what to do next.

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Tuesday, November 19th, 2024 AT 6:43 AM

KEN L

MASTER CERTIFIED MECHANIC
48,397 POSTS

Lets check for spark again to see if it is still there, please go over this video which will help you see what's going on and how to test for spark. I have seen the engine run low on engine oil and cut the spark off so please check that first.

https://www.youtube.com/watch?v=lXLJbuAZ4CE&t

Please upload pictures or videos in your response of any problems so we can see what to help you with.

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Thursday, November 21st, 2024 AT 9:33 AM