Engine stumbles when idling - what's wrong?
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Joined: Nov 2003
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From: California
Engine stumbles when idling - what's wrong?
When I'm waiting at a traffic light, I can feel the car shudder slightly every now and then. Since the RPM dips down momentarily when the car shudders, I figure it must be the engine that's stumbling.
Any idea what the problem might be?
'92 LS - 100K miles
Any idea what the problem might be?
'92 LS - 100K miles
Instructor
Joined: Mar 2001
Posts: 1,189
Likes: 15
From: Guam
Originally Posted by LS4Lexus
When I'm waiting at a traffic light, I can feel the car shudder slightly every now and then. Since the RPM dips down momentarily when the car shudders, I figure it must be the engine that's stumbling.
Any idea what the problem might be?
'92 LS - 100K miles
Any idea what the problem might be?
'92 LS - 100K miles
Chu...
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Joined: Nov 2003
Posts: 56
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From: California
Originally Posted by ChuH
Without knowing some history with your car it is very difficult to help diagnose this problem. When is the last time you changed your air filter and spark plugs? Does the problem occur when your A/C compressor kick in? Does the problem occur when you come to a stop?
Chu...
Chu...
I can feel the shudder when the engine is idling (e.g. waiting at a traffic light) even when the A/C is off.
Pole Position
Joined: Jan 2004
Posts: 3,379
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From: St. Thomas, Ontario
Originally Posted by LS4Lexus
Air filter changed 8K miles ago. Spark plugs changed 20K miles ago.
I can feel the shudder when the engine is idling (e.g. waiting at a traffic light) even when the A/C is off.
I can feel the shudder when the engine is idling (e.g. waiting at a traffic light) even when the A/C is off.
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Thread Starter
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Joined: Nov 2003
Posts: 56
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From: California
The fuel pump and fuel filter (OEM) were replaced a year and a half ago - this was after the engine shut off on its own when coasting at a low speed. Hopefully it's not the same thing, as that was an expensive repair!
Thanks for the suggestions. If anything else comes to mind, please post.
Thanks for the suggestions. If anything else comes to mind, please post.
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