IDLES ALL JACKED

cobraaaamannn · January 13th, 2012, 09:56 PM

Hey guys, i hope im in the right spot. I have a 98 cobra. It has idle problems. Some times when I initially start it, it will idle down to 400rpms, and almost stall out. then spike back up to about 1500. sometimes while driving it, ill stop at a light and the idle will stick at 1500 and after a few seconds calm down. It will also on first start and after running..will idle to 400 and fluctuate between 400 and 500 and bog down likes its missing a cylinder. I replaced plugs, checks msd ignition for back wire but seems fine. Ive cleaned MAF. I seem to hear some kind of what I think vac leak on right side of engine near plugs.....cant seem to loccate it pin point, I sprayed MAF cleaner on it and rpm's spiked up a small bit....would that be an indication of a vac leak?

VAC LEAK ? Maybe injectors? Or BAD fwd O2?
Its got 3.73s, XPIPE,JLT CAI, MSD ignition,

I cant grasp the problem??? THANKSSSSS@!!

cobraaaamannn · January 13th, 2012, 09:59 PM

ALSO THROTTLE RESPONSE, SOMETIMES WHEN I FIRST START IT, AND TAKE OFF IT WILL LAG WHEN I GIVE IT GAS.....LIKE ITS NOT GETTING WHAT IT NEEDS??? THROUGH THE GEARS....EVEN SOMETIMES WHILE AROUND 75MPH IT WILL LAG DOWN AND SEEM TO GET STUCK AND NOT WANNA CONTINUE TO ACCELERATE!!!!!!!!!

ahhhhhhhhhhhhhhhhhhhhhhhhh@!@#%%^(&^*

lakesidecustoms · January 13th, 2012, 10:08 PM

I would check the intake. You might have a intake leak and it is sucking air. With it running spray around the intake and see if it changes the idle. If it does you have a intake leak. Its just like having a vac. leak. Let us know what you come up with.

97S281 · January 14th, 2012, 01:49 PM

He already said he had a leak at the intake.

96red&blackstang · January 17th, 2012, 01:12 PM

throttle positioning sensor or TPS. i was trying to fix the wires that connect to this and notice that if these wires touch it would spike the idle at 2000rpm and wont drop down.

cobraaaamannn · January 18th, 2012, 10:04 PM

OK ILL check that out.... I have read a lot about maybe the o2's could be bad or maybe even the injectors...someone said if the altanator was bad then it sparks could be low....so many things@!!!! AHHHHHHHH

THANKS GUYS & GALS

Tang Stang · January 19th, 2012, 11:30 AM

Originally Posted by cobraaaamannn

I seem to hear some kind of what I think vac leak on right side of engine near plugs.....cant seem to loccate it pin point, I sprayed MAF cleaner on it and rpm's spiked up a small bit....would that be an indication of a vac leak?

That would be the problem.

cobraaaamannn · January 21st, 2012, 12:56 AM

how could I fix it or even isolate it tho

Tang Stang · January 21st, 2012, 10:24 PM

Wherever you were spraying the MAF cleaner when the rpm's increased...there is your leak.

January 13th, 2012, 09:56 PM	#1
cobraaaamannn Newbie Join Date: Jan 2012 Posts: 6 iTrader: 0 reviews	IDLES ALL JACKED Hey guys, i hope im in the right spot. I have a 98 cobra. It has idle problems. Some times when I initially start it, it will idle down to 400rpms, and almost stall out. then spike back up to about 1500. sometimes while driving it, ill stop at a light and the idle will stick at 1500 and after a few seconds calm down. It will also on first start and after running..will idle to 400 and fluctuate between 400 and 500 and bog down likes its missing a cylinder. I replaced plugs, checks msd ignition for back wire but seems fine. Ive cleaned MAF. I seem to hear some kind of what I think vac leak on right side of engine near plugs.....cant seem to loccate it pin point, I sprayed MAF cleaner on it and rpm's spiked up a small bit....would that be an indication of a vac leak? VAC LEAK ? Maybe injectors? Or BAD fwd O2? Its got 3.73s, XPIPE,JLT CAI, MSD ignition, I cant grasp the problem??? THANKSSSSS@!!

January 14th, 2012, 01:49 PM	#4
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	He already said he had a leak at the intake. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

January 21st, 2012, 10:24 PM	#9
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	Wherever you were spraying the MAF cleaner when the rpm's increased...there is your leak. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

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January 13th, 2012, 09:59 PM	#2
cobraaaamannn Newbie Join Date: Jan 2012 Posts: 6 iTrader: 0 reviews	ALSO THROTTLE RESPONSE, SOMETIMES WHEN I FIRST START IT, AND TAKE OFF IT WILL LAG WHEN I GIVE IT GAS.....LIKE ITS NOT GETTING WHAT IT NEEDS??? THROUGH THE GEARS....EVEN SOMETIMES WHILE AROUND 75MPH IT WILL LAG DOWN AND SEEM TO GET STUCK AND NOT WANNA CONTINUE TO ACCELERATE!!!!!!!!! ahhhhhhhhhhhhhhhhhhhhhhhhh@!@#%%^(&^*

January 13th, 2012, 10:08 PM	#3
lakesidecustoms Lake View Customs 1998 GT convertible 5 spe Join Date: Jan 2012 Location: KY Posts: 13 iTrader: 0 reviews	I would check the intake. You might have a intake leak and it is sucking air. With it running spray around the intake and see if it changes the idle. If it does you have a intake leak. Its just like having a vac. leak. Let us know what you come up with.

January 17th, 2012, 01:12 PM	#5
96red&blackstang Regular 1996 Mustang gt Join Date: Aug 2010 Location: San Antonio Posts: 69 iTrader: 0 reviews	throttle positioning sensor or TPS. i was trying to fix the wires that connect to this and notice that if these wires touch it would spike the idle at 2000rpm and wont drop down.

January 18th, 2012, 10:04 PM	#6
cobraaaamannn Newbie Join Date: Jan 2012 Posts: 6 iTrader: 0 reviews	OK ILL check that out.... I have read a lot about maybe the o2's could be bad or maybe even the injectors...someone said if the altanator was bad then it sparks could be low....so many things@!!!! AHHHHHHHH THANKS GUYS & GALS

January 21st, 2012, 12:56 AM	#8
cobraaaamannn Newbie Join Date: Jan 2012 Posts: 6 iTrader: 0 reviews	how could I fix it or even isolate it tho

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