surging idle help

jam77 · August 19th, 2007, 12:52 AM

I have a problem with my 87 mustang gt's idle it surges by about 400 rpms and them dies. I have tried just about everything from running codes to resetting base idle numerous times. Just curious if any of you guys have any ideas. I was told that idle issues can be worked out with a tune via a chip or pms type device is this true? Thanks for any help you guys can provide

sn94 · August 19th, 2007, 01:11 AM

Hey
I Had The Same Issue With My 94 Gt
I Cleaned The IAC (IDLE AIR CONTROL)
And Clean The MAF
That Stopped My Car From Dying Out
Sumtimes It Can Be A Fuel Pressure Regulator
U Can Hook Up A Guage And See If The Fuel Pressure Is Correct
I Would Clean The IAC and MAF
Hope This Helps

PaT #06

jam77 · August 19th, 2007, 05:40 PM

Ive actually replaced the mass air meter and the iac. I just got done spraying the vacume lines with card clean and the idle doesnt change so im beginning to rule out a vaccume leak. The only thing i can think of is a kink in the return line on the fuel tank when i swapped to the 255lph fuel pump. Is it possible to have a surging idle from that??

usmcsawgunner · August 19th, 2007, 05:51 PM

i doubt it...

sn94 · August 19th, 2007, 06:54 PM

yea i dont think that would be a problem
i would check just in case tho
wow im stumped
ill ask around and see what else i can find

PaT #06

jam77 · August 19th, 2007, 07:45 PM

yeah the only reason i think the fuel line is because it was kinda in bad shape and after putting the pump in i find that i cant back the fuel pressure down with my adj regulator as low as i used to before the install, ive actually backed the screw almost out of the regulator and it still wont come down. idling my wideband stays around 10.0 and the fumes will drive you out of the garage.

AdderMk2 · August 20th, 2007, 03:22 PM

sounds like you have a bad ECT or ACT to me.... might wanna check those out

92_LX_5.0 · August 20th, 2007, 06:45 PM

try disconnecting and cleaning the "salt and pepper shakers" and by that i mean the two big wiring connectors on the top/backside of your plenum.

August 19th, 2007, 12:52 AM	#1
jam77 Enthusiast 1987 Mustang GT Join Date: Apr 2007 Location: IL Posts: 685 iTrader: 0 reviews	surging idle help I have a problem with my 87 mustang gt's idle it surges by about 400 rpms and them dies. I have tried just about everything from running codes to resetting base idle numerous times. Just curious if any of you guys have any ideas. I was told that idle issues can be worked out with a tune via a chip or pms type device is this true? Thanks for any help you guys can provide __________________ 87 GT, typhoon upper and lower,70mm tb, 90mm maf, bbk shorties, bbk x-pipe, flowmaster cat back, 3:73 gear, pro 5.0 shifter, novi blower,afm power pipe, load IO, Trick Flow heads, Anderson B-31 cam, Anderson PMS, 42 lb injectors, t-rex fuel pump.

August 19th, 2007, 01:11 AM	#2
sn94 Regular BLWN91GT Join Date: Jul 2007 Location: Dyer, Indiana Posts: 393 iTrader: -1 reviews	IDLE ISSUES Hey I Had The Same Issue With My 94 Gt I Cleaned The IAC (IDLE AIR CONTROL) And Clean The MAF That Stopped My Car From Dying Out Sumtimes It Can Be A Fuel Pressure Regulator U Can Hook Up A Guage And See If The Fuel Pressure Is Correct I Would Clean The IAC and MAF Hope This Helps PaT #06

August 19th, 2007, 05:40 PM	#3
jam77 Enthusiast 1987 Mustang GT Join Date: Apr 2007 Location: IL Posts: 685 iTrader: 0 reviews	surging idle help Ive actually replaced the mass air meter and the iac. I just got done spraying the vacume lines with card clean and the idle doesnt change so im beginning to rule out a vaccume leak. The only thing i can think of is a kink in the return line on the fuel tank when i swapped to the 255lph fuel pump. Is it possible to have a surging idle from that?? __________________ 87 GT, typhoon upper and lower,70mm tb, 90mm maf, bbk shorties, bbk x-pipe, flowmaster cat back, 3:73 gear, pro 5.0 shifter, novi blower,afm power pipe, load IO, Trick Flow heads, Anderson B-31 cam, Anderson PMS, 42 lb injectors, t-rex fuel pump.

August 19th, 2007, 07:45 PM	#6
jam77 Enthusiast 1987 Mustang GT Join Date: Apr 2007 Location: IL Posts: 685 iTrader: 0 reviews	surging idle help yeah the only reason i think the fuel line is because it was kinda in bad shape and after putting the pump in i find that i cant back the fuel pressure down with my adj regulator as low as i used to before the install, ive actually backed the screw almost out of the regulator and it still wont come down. idling my wideband stays around 10.0 and the fumes will drive you out of the garage. __________________ 87 GT, typhoon upper and lower,70mm tb, 90mm maf, bbk shorties, bbk x-pipe, flowmaster cat back, 3:73 gear, pro 5.0 shifter, novi blower,afm power pipe, load IO, Trick Flow heads, Anderson B-31 cam, Anderson PMS, 42 lb injectors, t-rex fuel pump.

August 20th, 2007, 03:22 PM	#7
AdderMk2 Banned Join Date: Aug 2007 Location: al-Ahhmadi, Kuwait Posts: 991 iTrader: 0 reviews	sounds like you have a bad ECT or ACT to me.... might wanna check those out __________________ [URL="http://providence.craigslist.org/cto/2148862880.html"]1994 Cobra For Sale[/URL] [SIGPIC][/SIGPIC] [QUOTE=Timm10221]Its only a 10 inch Tach that sits right in the center of the dash with LED lights and a Spinner bezel that has dimonds and gold plating.. And when you hit 4500 plus is sounds off (AAHHH SHITT) :cool:[/QUOTE]

August 19th, 2007, 05:51 PM	#4
usmcsawgunner Regular 1993 Mustang GT 13.2 @98.54 Join Date: Apr 2007 Location: Kaneohe Bay, Hawaii Posts: 433 iTrader: 0 reviews	i doubt it...

August 19th, 2007, 06:54 PM	#5
sn94 Regular BLWN91GT Join Date: Jul 2007 Location: Dyer, Indiana Posts: 393 iTrader: -1 reviews	yea i dont think that would be a problem i would check just in case tho wow im stumped ill ask around and see what else i can find PaT #06

August 20th, 2007, 06:45 PM	#8
92_LX_5.0 Newbie Join Date: Jan 2007 Posts: 43 iTrader: 0 reviews	try disconnecting and cleaning the "salt and pepper shakers" and by that i mean the two big wiring connectors on the top/backside of your plenum.

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surging idle help