Question about Pontiac Montana

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Loud lifters Change oil on 99 Montana. After 250 mile trip, I stopped and when I started it back up, I heard a loud lifter noise that got worse as I accelerated. I checked the oil and it seemed weird (kinda like syrup) (not a head gasket issue) I changed the oil and used valve medic and it quieted down about 85% but still have a noise when in idle and during initial acceleration. Seems to quiet down at highway speeds.

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  • Pontiac Master
  • 5,371 Answers

Good you changed the oil. Keep an eye on it. It should stay a nice clear color for about a thousand miles. Sounds like a lifter is bad. Good idea to change them all if you change one. If it doesn't get worse, and doesn't cause any other problems, some people just live with it.

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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  • 35 Answers

SOURCE: rough idle / varying oil pressure when accelerating

Ok not to keen on newer vehicles actually prefer the carburated ones, but oil pressure is supposed increase on your gauge when accelerating. If it wasn't going up before and just staying at 40 the needle might have been stuck. But idle should be 40 lbs and when you work the moter (reving or driving down the road) the guage should show an increase for every 1000 rpm above idle. Second if you can get a hand held scanner (bought mine off ebay for $30) check for any codes in your computer you will probably find that you either have a bank running wrong or some other sensor that needs to be changed. I'd go with getting my own scanner it saves alot of money and time, garages make their money here.

Posted on Jan 03, 2009

joecoolvette
  • 5660 Answers

SOURCE: Clicking noise when accelerating

It's hard to diagnose with just the small information you have stated, but it 'sounds' like it's that Exhaust Gas Recirculation Valve gasket.

In your cylinder head is a runner that brings exhaust gas up through the intake manifold.
The EGR valve is attached to the intake manifold, and the sensory part of the EGR valve sits down in the pathway of the runner.

A bad EGR valve gasket will let exhaust gasses escape, making the sound you described.

Posted on Apr 20, 2009

SOURCE: tapping sound after changing all new lifters

What motor is it? Some of the V-6's will always make the noise no matter what you do! Gotta love GM for this!

Posted on Jun 08, 2009

Blackberry_U
  • 223 Answers

SOURCE: Engine makes a rapping noise at idle and under throttle.

The rapping noise makes me think that it might be a broken belt or even the lifters. It could be even your fan. Check the blades to se if they are bent or broken.

Posted on Jun 17, 2009

  • 7 Answers

SOURCE: Knocking noise. Overheated engine, warped heads,

overhaul

Posted on Oct 20, 2010

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