Rough Idle
Thread Starter
Joined: 03-30-2020
Posts: 5
From: Tx
Rough Idle
My car has a rough idle while filling with gas, but once going down the road it's ok. Only happens while stopped at the pump and actually filling the car. It also happens when I turn the AC on and it's at idle. Doesn't run rough going down the road. The rpms surge from normal to below normal. Never surges above the regular rpms. I am sure this has been discussed somewhere in the forum but if someone could please point me to that particular forum or perhaps have an idea as to what it may be. The evap purge solenoid under the hood has been replaced already.
Senior Member
Joined: 05-02-2014
Posts: 227
From: Oshawa, Ontario
My car has a rough idle while filling with gas, but once going down the road it's ok. Only happens while stopped at the pump and actually filling the car. It also happens when I turn the AC on and it's at idle. Doesn't run rough going down the road. The rpms surge from normal to below normal. Never surges above the regular rpms. I am sure this has been discussed somewhere in the forum but if someone could please point me to that particular forum or perhaps have an idea as to what it may be. The evap purge solenoid under the hood has been replaced already.
Thread Starter
Joined: 03-30-2020
Posts: 5
From: Tx
There is no Check Engine light on btw. Just the rought idle. The car is an 08 SS with 56k. Just recently got it about a month ago. So it has sat quite a bit.
Senior Member
Joined: 05-02-2014
Posts: 227
From: Oshawa, Ontario
it fixed mine when I was having a rough idle when it was stockish and saved me the trouble of fixing it. My idle is weird now too but that is unrelated lol. I’m going to do the same thing to my daily driven ss when it goes eventually
Senior Member
Joined: 10-19-2013
Posts: 419
From: Dallas Texas
My car has a rough idle while filling with gas, but once going down the road it's ok. Only happens while stopped at the pump and actually filling the car. It also happens when I turn the AC on and it's at idle. Doesn't run rough going down the road. The rpms surge from normal to below normal. Never surges above the regular rpms. I am sure this has been discussed somewhere in the forum but if someone could please point me to that particular forum or perhaps have an idea as to what it may be. The evap purge solenoid under the hood has been replaced already.
1 Check for CEL codes
2 Clean Throttle body
3 Check for vacuum leaks
4 Spark Plugs
5 Possibly problem with coil packs
6 Test Fuel pressure
7 check air filter
8 Clean Mass Air flow sensor
9 timing chain loose
Moderator
Joined: 01-23-2009
Posts: 26,483
From: Fredericksburg,VA
Add AC compressor showing signs of imminent death to the list.
It is against the law to fill your tank while the engine is running because it is a fire hazard; you might as well hold a lit match near the filler. The EVAP system will try to tell the operator how stupid they are by making the engine run bad. The EVAP vent valve MUST be open in order to fill the tank; it opens when the engine is off.
It is against the law to fill your tank while the engine is running because it is a fire hazard; you might as well hold a lit match near the filler. The EVAP system will try to tell the operator how stupid they are by making the engine run bad. The EVAP vent valve MUST be open in order to fill the tank; it opens when the engine is off.
