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Rough idle....

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Old Aug 30, 2009 | 01:11 AM
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Raggedy Ann's Avatar
Raggedy Ann
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Default Rough idle....

My 79 L48 just started idling rough all the sudden....It was fairly cool outside this evening, but I ran the car for about 20 minutes, and it's like it never warmed up and the temp never got above 1/4....It also hesitated when accelerating from a dead stop, but ran pretty well once the car was moving.
I did just change the neck and gasket that was leaking above the thermostat....is it possible the thermostat's bad and causing the rough idle?
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Old Aug 30, 2009 | 07:40 PM
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Gasket will have no affect on the engine idle.

You need to open the hood and have a good visual inspection to see if you have disturbed something while you were working. Check that you didn't loosen a spark plug lead. Also check that the alternator or drive belts didn't get wet with anti-freeze.
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Old Aug 31, 2009 | 08:55 AM
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Sounds like a vacuum leak to me... I would look and see if you knocked something off the carb in terms of vaccum lines.
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Old Aug 31, 2009 | 09:21 AM
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Originally Posted by Crash80
Sounds like a vacuum leak to me... I would look and see if you knocked something off the carb in terms of vaccum lines.


If you're using vacuum advance, have a look at the rubber hose going to the distributor...
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