ALEV8

I have always hated a rough idle. Should I check my plugs first? Need some guidance. Thanks!

mudman2

Not really , need more description. What happens when rolling

Model / Year

Boeing 717

Mine idles rough for about 1-2 mins after initial startup then stops, actually its misfiring, but porsche said they could see no misfire codes and it still did it after i replaced coils so........

mudman2

2 things come to mind

1 - Check valve failing on fuel system, is it worse after filling gas
2 - Fuel pump beginning to fail

ALEV8

Idles slightly rough at a stop and at initial startup, not while rolling. Drives and accelerates great. 2004 CTT.

ALEV8

I'll have the fuel pumps/pressure checked if it's easy enough to do. Not noticeably worse after fill-up.

mudman2

OK check valve ok, coils ok

ALEV8

Got it. My thought was fuel pump.

mudman2

mine to

Dennis C

When my coils went, I got a CEL and it smelled like burning sulfur.

ALEV8

Yeah nothing like that. Occasionally I get a waft of weird air freshener or something when I first start the AC after work, not in AM. It does not smell like coolant either.

yeldogt

The A/C smell is most likely not related.

Mine did run rough at times -- no codes -- and it was the coils.


Another strange thing about my 06 -- it can not be left running while you are refueling. I normally don't do it with my cars but early on it was running a few times when it was getting gas and the car would stumble and give me a rough idle for hours after?

It must get air in the fuel system - can't think what else it could be?

Km1.8t

You will know it when the coils actually go bad enough to make a difference at idle and pull a light. I think they do start to run rough as they break down but it takes the cracking to get severe before the cel comes on. I pulled the codes on mine before I changed them and it only showed a missfire at number 4 but when I pulled out the coils, they were ALL cracked. Incidently, number 4 was in the worse condition. I would just go ahead and change them along with the plugs with the most recent parts available. My new coils ended in 08 in the part number.

ALEV8

My plugs have 40k on them.

mtonks

Did you ever fix this as it have the same problem and it's driving me insane! Cheers