fuel problem?

mrmccrory · October 8th, 2009, 03:30 PM

i have a 98 cobra svt 5 speed dohc. when i go start it up, it sometimes starts but dies, or it starts but its a weak, studdered start. i only use premium but only once in a while idle speed increases to about 1200 rpm. whats really going on here?

Trick Tuners · October 8th, 2009, 03:34 PM

any computer codes. Did you try cleaning the IAC?

mrmccrory · October 8th, 2009, 04:45 PM

no i didnt try the i.a.c. i thought that might be it but i wasnt sure.

DickH · October 9th, 2009, 06:49 AM

does it drive around fine once running?

Traidmarx · October 9th, 2009, 01:33 PM

hmmm...i don't wanna say for sure but same thing happened to my buddy's 97 cobra, ended up being the timing chain broke....does it run okay once you've got it running..when idling at 1200, is it smooth or idling rough?

mrmccrory · October 9th, 2009, 04:58 PM

it runs real smooth when i start it up. the idle speed increases only once in a while, and the car doesnt run rough when @ 1200 rpm,its natrual idle speed in about 850 rpm. just louder and more unnatrual. from all of that it does kinda make sense that the problem could be the air intake control unit. either it needs to be cleaned or replaced.

October 8th, 2009, 03:30 PM	#1
mrmccrory Newbie 1998 cobra svt Join Date: Sep 2009 Posts: 16 Blog Entries: 1 iTrader: 0 reviews	fuel problem? i have a 98 cobra svt 5 speed dohc. when i go start it up, it sometimes starts but dies, or it starts but its a weak, studdered start. i only use premium but only once in a while idle speed increases to about 1200 rpm. whats really going on here?

October 8th, 2009, 03:34 PM	#2
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,471 iTrader: 3 reviews	any computer codes. Did you try cleaning the IAC? __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

October 9th, 2009, 06:49 AM	#4
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 3,944 iTrader: 2 reviews	does it drive around fine once running? __________________ Before asking a gearing related question click THIS link and enjoy all your saved time. Click here for your tuning needs My slow paced budget 5.4 dohc build

October 9th, 2009, 01:33 PM	#5
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,079 iTrader: 0 reviews	hmmm...i don't wanna say for sure but same thing happened to my buddy's 97 cobra, ended up being the timing chain broke....does it run okay once you've got it running..when idling at 1200, is it smooth or idling rough? __________________ 1995 Mustang GT..4.30's,BBK Longtubes, Off Road X-Pipe,Magnaflow Catback,BBK Intake,BBK Underdrive Pulleys Walbro 255lph pump,accel dizzy,MSD Coil,MSD 8.5 Super Conductors,front sway bar removed, more coming soon.

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October 8th, 2009, 04:45 PM	#3
mrmccrory Newbie 1998 cobra svt Join Date: Sep 2009 Posts: 16 Blog Entries: 1 iTrader: 0 reviews	no i didnt try the i.a.c. i thought that might be it but i wasnt sure.

October 9th, 2009, 04:58 PM	#6
mrmccrory Newbie 1998 cobra svt Join Date: Sep 2009 Posts: 16 Blog Entries: 1 iTrader: 0 reviews	it runs real smooth when i start it up. the idle speed increases only once in a while, and the car doesnt run rough when @ 1200 rpm,its natrual idle speed in about 850 rpm. just louder and more unnatrual. from all of that it does kinda make sense that the problem could be the air intake control unit. either it needs to be cleaned or replaced.

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