Stumbling Engine

got boost? got a pretty engine bay? stuck in gear? rebuild your shifter and then post here
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andy
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Stumbling Engine

postby andy » 11/02/13 @ 22:21

Ok I am having a weird issue. Once the car gets warmed up I have this stumbling issue that occurs from a dead stop to about 2000 rpm. Once I am passed that I have no issues.

I can re create the problem by pulling the E brake and forcing the engine to stay in the range of problems. Around 1200-2000 rpm.

I also had an issue where when the car was stopped and I pressed the gas slightly it would go to 2100 rpm and then bounce down and go up and bounce down and go back up. I took video of the problem here it is.

I have plugs and wires with 6,000 miles on them.



Any thoughts?
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bigx5murf
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Re: Stumbling Engine

postby bigx5murf » 11/03/13 @ 02:35

Just taking a shot in the dark here, but do you have any way to measure voltage? I've found that when your alternator is going out, the ecu will raise the idle to try and compensate.
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Waffles
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Re: Stumbling Engine

postby Waffles » 11/03/13 @ 02:44

Check your coolant level.
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andy
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Re: Stumbling Engine

postby andy » 11/03/13 @ 12:46

To add another piece to the puzzle my car is perfect when it is cold and i have no issues until about 30 minutes later well after the car has warmed up.

It is a 92 with a 1.6.
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phillyb™
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Re: Stumbling Engine

postby phillyb™ » 11/03/13 @ 12:50

my friend had a misfire at idle and literally replaced EVERYTHING he could think of and still never found the issue.

i wonder if a bad fuel philter could cause this...

it is weird that it's only while warm. so @waffles might be on to something...
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Waffles
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Re: Stumbling Engine

postby Waffles » 11/03/13 @ 13:45

Low coolant causes the IACV sensor (or whatever you miata guys call it) to go crazy. it causes a surging and or erratic idle.

EDIT: or just an air bubble, so if its not low try bleeding the system.

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