AHHHH my car wont idle help

91evilstang · 03-22-2001, 04:24 AM

I have a 91GT stock short block and almost every thing else except F303 cam off road H pipe(with stock headers)pullys roller rockers and high lift valve springs.My car will surge up and down, up to about 1500 and down to about 500(especially when cold)and now the problem has progressed to the point where it dies if i dont keep my foot on the gas(very annoying since its a five speed)I havent really tried anything thought i would get some advice before waisting time and money.Any help would be greatly appreciated.

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speed is money.How fast you want to go?

MSTANGfromSN · 03-22-2001, 01:52 PM

Surging is generally related to a fuel mixture (lean typically) problem.

I'd check your TPS/idle setting & that should eliminate it.

If you can verify your fuel pressure might wanna check that to.

How old is your Fuel Filter.

03-22-2001, 05:49 PM

Clean the IAC and check the TPS. Also make sure the mass air meter is plugged in all the way. Sometimes the plug doesn't snap and it vibrates back out.

gray87GT · 03-22-2001, 11:46 PM

Just for sh*ts and giggles why don't you unhook the PCV hose from your valve cover to your throttle body. I did that and it ran sweet even if I capped them both off. I know you shouldn't do this, but if it helps it may narrow it down to a PCV/MAF problem.

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87 GT, BBK shorty's, offroad H-pipe, ASP pullies, 70mm T.B., Cobra intake, no smog pump, Windsor Jr irons, Comp cams 1.6 rollers, F303 cam, H.D. export W.P., Tri-Ax, FMS subframes, Battle boxes, SSM liftbars, FMS King Cobra clutch, mass-air conversion, 73mm C&L, 24lb injectors, BBK fuel pressure regulator, 3/8" no EGR spacer, and other piddly sh*t.

03-22-2001, 04:24 AM	#1
91evilstang Registered Member Join Date: Mar 2001 Location: lafayette IN USA Posts: 48	AHHHH my car wont idle help I have a 91GT stock short block and almost every thing else except F303 cam off road H pipe(with stock headers)pullys roller rockers and high lift valve springs.My car will surge up and down, up to about 1500 and down to about 500(especially when cold)and now the problem has progressed to the point where it dies if i dont keep my foot on the gas(very annoying since its a five speed)I havent really tried anything thought i would get some advice before waisting time and money.Any help would be greatly appreciated. ------------------ speed is money.How fast you want to go?

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03-22-2001, 01:52 PM	#2
MSTANGfromSN Registered Member Join Date: Mar 2001 Location: Balto. MD Posts: 35	Surging is generally related to a fuel mixture (lean typically) problem. I'd check your TPS/idle setting & that should eliminate it. If you can verify your fuel pressure might wanna check that to. How old is your Fuel Filter.

03-22-2001, 05:49 PM	#3
88GT5.013.02 Guest Posts: n/a	Clean the IAC and check the TPS. Also make sure the mass air meter is plugged in all the way. Sometimes the plug doesn't snap and it vibrates back out.

03-22-2001, 11:46 PM	#4
gray87GT Registered Member Join Date: Jan 2001 Location: Minnesota Posts: 177	Just for shts and giggles why don't you unhook the PCV hose from your valve cover to your throttle body. I did that and it ran sweet even if I capped them both off. I know you shouldn't do this, but if it helps it may narrow it down to a PCV/MAF problem. ------------------ 87 GT, BBK shorty's, offroad H-pipe, ASP pullies, 70mm T.B., Cobra intake, no smog pump, Windsor Jr irons, Comp cams 1.6 rollers, F303 cam, H.D. export W.P., Tri-Ax, FMS subframes, Battle boxes, SSM liftbars, FMS King Cobra clutch, mass-air conversion, 73mm C&L, 24lb injectors, BBK fuel pressure regulator, 3/8" no EGR spacer, and other piddly sht.