Rough Idle at Stop Lights - Maintenance and Repair Forum

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Rough Idle at Stop Lights
Monday, August 24, 2015 7:29 AM
Hi all,

I have a Pontiac Sunfire 2003
2.2L Ectotec

What I've done so far:

Throttle body cleaned replaced IAC, MAP sensor, Fuel filter, Fuel pressure regulator.

When I check fuel pressure I get 50psi.

Spark plugs were changed

No vacuum leaks.

I'm at a loss....

Re: Rough Idle at Stop Lights
Monday, August 24, 2015 8:01 AM
Have you tried pulling the battery cable for a few minutes to reset the stored data in the PCM? Compression test?



"In Oldskool we trust"
Re: Rough Idle at Stop Lights
Monday, August 24, 2015 12:51 PM
Yes, I did a reset, didn't work.

How do I do a compression test on an Ecotec??
Re: Rough Idle at Stop Lights
Wednesday, September 02, 2015 11:52 AM
I did a compression test today and came out with 149 on all 4 cylinders with dry test.

But I came out with only 150 wet again all 4 cylinders. Did that come out right?? I put a cap full of oil in each cylinder when I ran the test...
Re: Rough Idle at Stop Lights
Wednesday, September 02, 2015 8:47 PM
Is your check engine light on?
What rpm does it sit at?
Re: Rough Idle at Stop Lights
Thursday, September 03, 2015 12:31 PM
Nicholas Reilly wrote:Is your check engine light on?
What rpm does it sit at?


No check engine light

When I'm at the stop light it sits at around 500 or 600 rpm
Re: Rough Idle at Stop Lights
Thursday, September 03, 2015 10:34 PM
Correction it is 800 RPM
Re: Rough Idle at Stop Lights
Monday, September 07, 2015 6:00 AM
Update:

Car is stumbling more when I stop, today on my way to work it almost concked out on me...
Re: Rough Idle at Stop Lights
Monday, September 07, 2015 12:59 PM
It is an auto right? How is the fluid level?

I know a problem in the older cavaliers was a torque converter locking solenoid would start to go, causing bad idle in gear from it trying to lock the converter. Could be a problem with that.
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