Service engine soon light?

WEESER

MEMBER
2002 CHEVROLET TRAILBLAZER
4 CYL
2WD
AUTOMATIC
140,500 MILES

I had an oil low light come on. I changed the oil pressure sensor and the spark pugs while I was at it. I drove the truck again the service engine soon light comes on. The truck runs hard now I get the codes read P0014 Cam sensor I changed the sensor and P1345 ignition system misfire what do I do now? The light is still on and the oil gauge still drops once in a while. I am lost now. Yes, I gapped the plugs correctly and started the motor and removed each electrical lead off the plugs one at a time to see if I had a bad plug, and the oil I used was Moble 1. The truck still runs hard and oil light comes on when at idle sometimes.

2 Replies

KASEKENNY

MECHANIC
18,907 POSTS

I am hoping that the low oil pressure light and these codes are not related. If they are then most likely you have metal floating around the engine oil system and it is getting caught in the phasers. However, let's run through this testing and see what we turn up.

Here are guides that cover all this material to help explain what you are testing:

https://www.2carpros.com/articles/how-camshaft-variable-valve-timing-works

https://www.2carpros.com/articles/high-or-low-engine-oil-pressure

Let us know what you find and we can go from there. Thanks

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Sunday, December 6th, 2020 AT 3:02 PM

STEVE W.

MECHANIC
12,998 POSTS

From the description it sounds like at least two issues, both likely stemming from the same cause, namely the lack of oil pressure. The first test would be to put a mechanical oil pressure gauge on it to see what the pressure actually is. However the final repair is likely going to be replacing the oil pump and probably the bearings for excess wear in all those parts which are reducing the oil pressure. That lower oil pressure is also responsible for the cam timing shifting and causing the cam sensor code and the misfire code as well because the cam position is causing leaks around some of the valves.

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Sunday, December 6th, 2020 AT 3:07 PM