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Old 05-13-2019, 08:10 AM   #1
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Location: Bergen, NY
What I Drive: 2004 Red SVT, 2007 Gray ST

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Question Idle and Stalling issues


I have been having some weird idle issues lately after I replaced my serpentine belt and tensioner. I also recently replaced my Oil pan as the old one was rusted and leaking.

Essentially the car is not consistent at idle, especially on cold start, it will wobble a little and starta round 1200-1300 cold, and then randomly dip down about 100rpm until it eventually balances out at around 830ish. Once it balances lower, it becomes super inconsistent, ranging between 800-850 and occasionally the engine will shake the whole car. The issue that reeeally threw me off was randomly (Only happened twice, I have seen no cadence) when I come to a stop light and go into neutral, the car is fine until I stop entirely. Once I am stopped completely the car sputters and the engine seems kinda almost cuts out, down to like 200rpm then kicks back up to 800, does that until I rev a little, then it balances. While that is happening the only lights that turn on on the dash is the Battery light.

I have replaced the coil pack and spark plug wires, I plan on getting spark plugs soon. My alternator is going to be rebuilt this week.

I have not yet replaced any timing parts since I got the car, but they are on the way (along with an underdrive pulley), I don't know if that's what could be causing it, or if it's something else, I am really not sure. I have replaced the PCV, and I have had issues with the VCT solenoid in the past (was leaking a little oil and wasn't seating correctly) so I am not really sure what is happening.

When the car is going, it runs fine. The issue only seems to be at idle, I get no bogging down or performance issues otherwise.

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