Bad Idle Trouble
 

I am having some problems with the way my car runs. When its cold, It will start, and idle good for a couple seconds, then hesitate and drop to under 500 rpms, then regain itself. It does this till its warm, and it stops. Also, Sometimes the car will idle above 1000 rpm until you stop and restart the engine. What going on?

What year Mustang do you own? If it is a 87-88 speed density I would check the idle air bypass valve. What mods do you have? Need more info.

You're going to have to give a little more information on your car before anyone can give you some help.

------------------
1995 Mustang GT

I have somewhat of the same problem. It idles around 1000 and then drops to about 500.It does almost anytime though. When I'm at a light I sometimes have to give it gas or else it will die. I dont know what it is but I recently installed an off-road H-pipe, and it never had that problem before. I thoght it was my cam at first because it did it before but very little like when it was hot or cold. I also thought it may be my timing.maybe someone out there can help me with a solution or something.
Thanks.

------------------
3.55 gears,posi,mac 1 5/8 shorties,off-road h-pipe,w/flowmasters,bbk 65mm throttle body,frpp aluminum driveshaft,frpp b303 cam,hurst short throw shifter.

Its a '90 and only things are headers, h-pipe, and cat-back

Clean the idle air motor, check the TPS, and reset the computer.

------------------
1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer

See my car at: www.mustangworks.com/cgi-bin/moi-display.cgi?179

When my 93 did that, I cleaned the throtle blade. It has a little hole in it, and if it plugs, the idle goes wonky.

------------------
93LX excopcar 150K 3.55's mac full headers. funnest car I ever had.
14.3@96 @ 4000ft
67 390 ranchero 3.70's cast manifolds, comp cams 260H, completly stock
15.1@90mph
66 merc comet 351w, isky roller 600 lift 268/260@.050, vic jr. 700DP, 5000stall, 4.56's c-4, 3400lbs with driver

Thanks guys Ill look into those things.

There are any improvement ?????

------------------
94 COBRA # 926/5009
TFS track heat heads (ported), Cobra intake (ported), 24# Injectors, 3/8" Phenolic spacer, E303 Cam, TFS 1.7 rr
BBK 1 5/8" headers, BBK 65mm TB, Pro-M 80mm MAS, PIH kit w/ A9L computer, FMS 3.55 ratio
BBK 190 lph fuel pump, Paxton fpr, MSD'S, March Pulley's, Pro-5 tower power shifter, Autometer shift light (5600),
Intellitronix Air/Fuel gauge, Eibach Sportline Springs, Tokico 5-way adjustable, Granatelli Motorsport Subframe



[This message has been edited by HAITHAM (edited 09-04-2001).]