Quote:
Originally Posted by S-Class Guru
Have you thought of an exhaust manifold leak; it has all the symptoms.
The vast majority of small manifold leaks pop when cold under acceleration, then seal up when hot.
Maybe leaking around the EGR system, if your car has one, or the manifold is cracked.
If the tick only occurs during acceleration, and not when just revving in neutral, it seems unlikely to be a valvetrain issue to me. The valvetrain and the oil supply don't know whether you are accelerating wide open or in neutral.
But..... covering all the bases; the hydraulic actuators (valve lifters) can be replaced relatively easily and inexpensively. They are in the ends of the rocker arms, so teardown is very minimal.
DG
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For mine at least, it is more than a tick, it is just loud in general. Mine does not appear in neutral, ONLY when accelerating (i.e. putting a load on the engine). I checked the exhaust manifold after I bought the car thinking it was an exhaust leak but found nothing--and it passed emissions with flying colors. I need to generally just inspect the thing and another engine is in the works since I want a good solid base for a turbo project.
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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.
Past: 135i, GTI, 300E, 300SD, 300SD, Stealth
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09-01-2010, 11:44 AM
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