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lindakoch76

DMax Cylinder Pressure Fluctuations

My 2004 Chevrolet DMax diesel is acting up. I'm getting higher fuel consumption, reduced power, and the check engine light keeps popping on. I'm also seeing cylinder pressure fluctuations. Could this be a timing belt issue or something worse, like the head gasket?

Summary of the thread

A 2004 Chevrolet DMax diesel is experiencing higher fuel consumption, reduced power, and cylinder pressure fluctuations, with the check engine light on. The initial concern is whether the issue is related to the timing belt or a more severe problem like the head gasket. A potential cause identified is a leak in the intake manifold, affecting the air-fuel mixture and cylinder pressure. The problem was ultimately traced to a sensor issue, with the intake manifold leak contributing to sensor errors, and it was resolved without cost.

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4 comment(s)

juergeneis93

Fluctuations in cylinder pressure with those symptoms could be a few things. When was the timing belt last changed? Have you noticed any unusual engine knocking or hissing sounds? It could also be a problem with the intake manifold.

lindakoch76 (community.author)

The timing belt was changed maybe 50,000km ago. Engine knocking? Not consistently, but I have noticed it a couple of times. What does the intake manifold have to do with cylinder pressure?

juergeneis93

A leak in the intake manifold can cause a change in the air-fuel mixture, messing with cylinder pressure. Intermittent knocking and pressure issues... I would have a mechanic check the camshaft timing and the manifold. Consequential errors can be nasty.

lindakoch76 (community.author)

Thanks, I'll get it checked out. It ended up being a sensor issue, but the mechanic said the intake manifold was indeed starting to leak, which was causing the sensor to throw codes. There was no cost to fix.

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CHEVROLET

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DMAX