Idle problem /// Need some help !

das50cal · July 3rd, 2007, 08:55 PM

When I am driving and push in my clutch, my idle will move up and down from 500 to 800 until I come to a complete stop. I have checked for vac leaks, changed my pcv valve, checked for exhaust leaks. I do not think it is my tune because I put it back to stock and it still done it.

I have an 05 gt with a vortech s-trim, xpipe, flowmasters and 4:10 gears. It seems that it did not start until my gears were installed. Maybe just a coinsidence.

any help would be great !!!!

TDog · July 3rd, 2007, 09:36 PM

is your air filter on your S/C breathing okay ? Idle is when the engine is at its weakest for sucking air. If you have blockage, this is where it could be.
Fuel too.

das50cal · July 3rd, 2007, 09:46 PM

yes it seems to be ok, I can hear it pretty good, what can I check as far as fuel ?

TDog · July 3rd, 2007, 09:48 PM

replace fuel filter. Before that though I'd go and buy gas from somewhere else. It could be gas. And, based on your tune for your S/C, you could be running the wrong octane.

das50cal · July 3rd, 2007, 10:02 PM

I usually buy 93 octain, when I buy 92 octain I cant tell any difference. I have not checked the fuel filte. I will check and see what it is tuned for.

TDog · July 3rd, 2007, 10:16 PM

GO to your garage and get a tune and/or your tune looked at. Follow the specs for gas that they tell you to the letter. Given you are supercharged, it could be the tune.

das50cal · July 3rd, 2007, 11:45 PM

I dont understand why it has not done it the whole time I had the tune though.

TDog · July 4th, 2007, 12:04 AM

hard to say then. could be gas, fuel filter, air filter prob...so hard to know unless you take care of each one at a time

das50cal · July 4th, 2007, 11:51 AM

I going to replace the fuel filter today, thanks for the help !!!

Grabber523 · July 4th, 2007, 03:27 PM

Drain all the fuel out of your system. Have a bonfire. Roast some weiners. Fill up at a different gas station that gets more business. Had the same thing when I filled up at a casino gas pump...loosely regulated...also got a lot of surging when I opened the throttle. Only thing I can think is the PCM was pulling timing waaaay out...

das50cal · July 4th, 2007, 05:07 PM

changed my fuel filter and it is still doing it. It cant be the gas it has been doing it for over a month.

Grabber523 · July 4th, 2007, 05:37 PM

I thought it couldn't possibly be gas with my 350z either...I was just filling up at the wrong gas station...new gas and it never came back.

das50cal · July 4th, 2007, 06:28 PM

I have noticed something else today, if I am in neutral and I just tap the gas pedal down like an 1/8 of an inch the idle goes down to 500 then goes back to 900 where it is set.

July 3rd, 2007, 08:55 PM	#1
das50cal Newbie Join Date: Sep 2006 Location: INDY Posts: 22	Idle problem /// Need some help ! When I am driving and push in my clutch, my idle will move up and down from 500 to 800 until I come to a complete stop. I have checked for vac leaks, changed my pcv valve, checked for exhaust leaks. I do not think it is my tune because I put it back to stock and it still done it. I have an 05 gt with a vortech s-trim, xpipe, flowmasters and 4:10 gears. It seems that it did not start until my gears were installed. Maybe just a coinsidence. any help would be great !!!! __________________ granny shifting, not double clutching like ya should. You could win by an inch or a mile...winning is winning.

July 3rd, 2007, 09:36 PM	#2
TDog Enthusiast Join Date: Jan 2007 Posts: 650	is your air filter on your S/C breathing okay ? Idle is when the engine is at its weakest for sucking air. If you have blockage, this is where it could be. Fuel too. __________________ Tdog 2007 mustang GT 5speed, Black

July 3rd, 2007, 09:46 PM	#3
das50cal Newbie Join Date: Sep 2006 Location: INDY Posts: 22	yes it seems to be ok, I can hear it pretty good, what can I check as far as fuel ? __________________ granny shifting, not double clutching like ya should. You could win by an inch or a mile...winning is winning.

July 3rd, 2007, 09:48 PM	#4
TDog Enthusiast Join Date: Jan 2007 Posts: 650	replace fuel filter. Before that though I'd go and buy gas from somewhere else. It could be gas. And, based on your tune for your S/C, you could be running the wrong octane. __________________ Tdog 2007 mustang GT 5speed, Black

July 3rd, 2007, 10:02 PM	#5
das50cal Newbie Join Date: Sep 2006 Location: INDY Posts: 22	I usually buy 93 octain, when I buy 92 octain I cant tell any difference. I have not checked the fuel filte. I will check and see what it is tuned for. __________________ granny shifting, not double clutching like ya should. You could win by an inch or a mile...winning is winning.

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July 3rd, 2007, 10:16 PM	#6
TDog Enthusiast Join Date: Jan 2007 Posts: 650	GO to your garage and get a tune and/or your tune looked at. Follow the specs for gas that they tell you to the letter. Given you are supercharged, it could be the tune. __________________ Tdog 2007 mustang GT 5speed, Black

July 3rd, 2007, 11:45 PM	#7
das50cal Newbie Join Date: Sep 2006 Location: INDY Posts: 22	I dont understand why it has not done it the whole time I had the tune though. __________________ granny shifting, not double clutching like ya should. You could win by an inch or a mile...winning is winning.

July 4th, 2007, 12:04 AM	#8
TDog Enthusiast Join Date: Jan 2007 Posts: 650	hard to say then. could be gas, fuel filter, air filter prob...so hard to know unless you take care of each one at a time __________________ Tdog 2007 mustang GT 5speed, Black

July 4th, 2007, 11:51 AM	#9
das50cal Newbie Join Date: Sep 2006 Location: INDY Posts: 22	I going to replace the fuel filter today, thanks for the help !!! __________________ granny shifting, not double clutching like ya should. You could win by an inch or a mile...winning is winning.

July 4th, 2007, 03:27 PM	#10
Grabber523 Hardcore Enthusiast 2007 Mustang GT 12.3@113 1.8 60' Join Date: Mar 2007 Location: Northwood, ND...Hell Has Frozen Posts: 1,157	Drain all the fuel out of your system. Have a bonfire. Roast some weiners. Fill up at a different gas station that gets more business. Had the same thing when I filled up at a casino gas pump...loosely regulated...also got a lot of surging when I opened the throttle. Only thing I can think is the PCM was pulling timing waaaay out... __________________ HMUSN: "I was rewarded with a fart of colossal magnitude -- a cross between the sound of someone ripping a very wet bed sheet in half and of plywood being torn off a wall."

July 4th, 2007, 05:07 PM	#11
das50cal Newbie Join Date: Sep 2006 Location: INDY Posts: 22	changed my fuel filter and it is still doing it. It cant be the gas it has been doing it for over a month. __________________ granny shifting, not double clutching like ya should. You could win by an inch or a mile...winning is winning.

July 4th, 2007, 05:37 PM	#12
Grabber523 Hardcore Enthusiast 2007 Mustang GT 12.3@113 1.8 60' Join Date: Mar 2007 Location: Northwood, ND...Hell Has Frozen Posts: 1,157	I thought it couldn't possibly be gas with my 350z either...I was just filling up at the wrong gas station...new gas and it never came back. __________________ HMUSN: "I was rewarded with a fart of colossal magnitude -- a cross between the sound of someone ripping a very wet bed sheet in half and of plywood being torn off a wall."

July 4th, 2007, 06:28 PM	#13
das50cal Newbie Join Date: Sep 2006 Location: INDY Posts: 22	I have noticed something else today, if I am in neutral and I just tap the gas pedal down like an 1/8 of an inch the idle goes down to 500 then goes back to 900 where it is set. __________________ granny shifting, not double clutching like ya should. You could win by an inch or a mile...winning is winning.

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