Knocking and Acceleration Troubles

STEVESMITH1987

MEMBER
CHEVROLET MONTE CARLO

Hi, I bought a 1996 Monte Carlo LS, 111,000 miles, Engine 3100 SFI VE. Latley the car begins to knock when its cold and when I accelerate it hesistates, once the car warms up the problem disappears but will reset and resume when it sits overnight.

All of my fluids are full, please help, thanks.

Steve

7 Replies

SERVICE WRITER

MECHANIC
9,123 POSTS

Hi Steve,

Would you describe this as a tick from the top of the motor, or more of a knock from the bottom?

When you got the car was the oil real dark, and when changing does it get dark very quick?

Lower end is usually bearings going bad, upper noise is usually a lifter or oil flow problem.

IT may help to see if any codes are stored in the pcm.

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Saturday, July 21st, 2007 AT 9:21 AM

STEVESMITH1987

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Definatley more of a tick on the top. I'm taking it in for a diagnostic today. The oil looked fine.

Would either of those be very costly? I only have $300 or so to spend.

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Saturday, July 21st, 2007 AT 10:20 AM

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Depending on the severity of the tick, it may be charactoristic.

The hesitation may not be related to the tick.

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Saturday, July 21st, 2007 AT 10:17 PM

STEVESMITH1987

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This morning I left the car warm up for about 3 minutes and the tick went away and I got no hesitation.

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Sunday, July 22nd, 2007 AT 6:44 AM

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I wonder if there is a vacuum leak that is sealing itself up when it gets hot. The intake manifold gaskets were a problem on these. You can spray carb cleaner around the gasket and see if the idle changes when it is cold.

Were their any codes present?

Perhaps a coolant temp sender is out of spec causing a early rich condition.

(The tick may still not be related only in that it is a symptom happening at the same time as the hesitation. That is, the tick may remain there once the hesitation is solved.)