Crazy Idle problem

Roket · 06-19-2003, 10:05 PM

My 92 mustang will idle at 2000 then goes down to 1100 (modified motor) like it should..then while im sitting still in neutral, it will slowly climb to 2000 again, and then goes back down to 1100..then after a while (few seconds), it goes down to like 800...ihave the idle set right and the tps....what can be causing this...oh..also have new o2 sensors installed today. Thanks guys

jimberg · 06-19-2003, 11:39 PM

Start by retrieving your codes. When you say you have the tps right, does that mean it's at .9 volts or so, or are you trying to set it for .99 volts?

You should reset your computer and then let it idle for about 10 minutes to let it relearn your new components.

Coupe50h · 06-20-2003, 12:20 AM

Check vaccuum connections.
i actually created a vacuum leak to make my car idle right, but the e-cam i have is notorious for that stuff.

Roket · 06-21-2003, 09:11 AM

What about the ilde control valve on the side of the TB? Would they get dirty or anything?

Coupe50h · 06-21-2003, 11:07 AM

Quote:

Originally posted by Roket
What about the ilde control valve on the side of the TB? Would they get dirty or anything?

yes, clean that with some tb/carb cleaner, worth a try being those things are like 50$

Roket · 06-21-2003, 06:16 PM

Ok, thanks guys!

jimberg · 06-21-2003, 09:04 PM

Did you not get any codes? I'd check that and the vacuum lines before I start pulling stuff apart.

Roket · 06-25-2003, 09:16 PM

havent checked codes yet, but will check hoses again

daman007 · 06-26-2003, 03:11 PM

if your idle is jumping around 9 times out of 10 its your idle control, its actualy pretty comon on 5.0 87-93, when my car started doing it i was going nuts yhen a freind pointed it out to me that thats what it probably was, first make sure your sensers are all working proper maybee get a code readout, then clesn the idle control unit, yhey get realy dirty. In my case i cleaned it and that was it problem solved, but 6 months later did it again so i replaced it and its never done yet for 2 years. just a little tidbit i thought id share with you, good luck.

Roket · 06-26-2003, 06:12 PM

I cleaned mine real good and no help....so im getting a new one today..thanks guys! Ill let ya know if it works better

bri32zz · 06-26-2003, 08:17 PM

Drill a small hole in your TB flap this helped mine idle right when I had my e-cam- Also clean your TPS and then unhook your neg. terminal for 30 minutes. Rehook it up idle the car for 10 minutes then drive in stop and go traffic for 30 minutes. This should help you out some. What kind of cam r u running? Good luck---Bri

jimberg · 06-26-2003, 09:41 PM

What codes did you get? If you haven't read them yet, why would you just start replacing parts that may not even have a problem? There are a bunch of things that can cause a rough idle.

06-19-2003, 10:05 PM	#1
Roket Registered Member Join Date: May 2002 Location: Ottawa illinois Posts: 41	Crazy Idle problem My 92 mustang will idle at 2000 then goes down to 1100 (modified motor) like it should..then while im sitting still in neutral, it will slowly climb to 2000 again, and then goes back down to 1100..then after a while (few seconds), it goes down to like 800...ihave the idle set right and the tps....what can be causing this...oh..also have new o2 sensors installed today. Thanks guys

06-19-2003, 11:39 PM	#2
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Start by retrieving your codes. When you say you have the tps right, does that mean it's at .9 volts or so, or are you trying to set it for .99 volts? You should reset your computer and then let it idle for about 10 minutes to let it relearn your new components. __________________ 351W 89 Mustang GT Convertible

06-20-2003, 12:20 AM	#3
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Check vaccuum connections. i actually created a vacuum leak to make my car idle right, but the e-cam i have is notorious for that stuff. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

06-21-2003, 09:04 PM	#7
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Did you not get any codes? I'd check that and the vacuum lines before I start pulling stuff apart. __________________ 351W 89 Mustang GT Convertible

06-26-2003, 03:11 PM	#9
daman007 Registered Member Join Date: Jun 2003 Location: victoria canada Posts: 7	idle control problem fix (most likely) if your idle is jumping around 9 times out of 10 its your idle control, its actualy pretty comon on 5.0 87-93, when my car started doing it i was going nuts yhen a freind pointed it out to me that thats what it probably was, first make sure your sensers are all working proper maybee get a code readout, then clesn the idle control unit, yhey get realy dirty. In my case i cleaned it and that was it problem solved, but 6 months later did it again so i replaced it and its never done yet for 2 years. just a little tidbit i thought id share with you, good luck.

06-21-2003, 09:11 AM	#4
Roket Registered Member Join Date: May 2002 Location: Ottawa illinois Posts: 41	What about the ilde control valve on the side of the TB? Would they get dirty or anything?

06-21-2003, 06:16 PM	#6
Roket Registered Member Join Date: May 2002 Location: Ottawa illinois Posts: 41	Ok, thanks guys!

06-25-2003, 09:16 PM	#8
Roket Registered Member Join Date: May 2002 Location: Ottawa illinois Posts: 41	havent checked codes yet, but will check hoses again

06-26-2003, 06:12 PM	#10
Roket Registered Member Join Date: May 2002 Location: Ottawa illinois Posts: 41	I cleaned mine real good and no help....so im getting a new one today..thanks guys! Ill let ya know if it works better

06-26-2003, 08:17 PM	#11
bri32zz Registered Member Join Date: Aug 2002 Location: Canton GA Posts: 216	Drill a small hole in your TB flap this helped mine idle right when I had my e-cam- Also clean your TPS and then unhook your neg. terminal for 30 minutes. Rehook it up idle the car for 10 minutes then drive in stop and go traffic for 30 minutes. This should help you out some. What kind of cam r u running? Good luck---Bri __________________ My CAR IS GONE R.I.P----I miss YOU 331ci, 69 Windsor heads ported and shaved , Trick Flow-Intake ported,JE blower pistons, Custom cam 542 lift, 1.73 rrs, Equal length headers, BBK Hi-Flow cats, Hurst shifter, 3:73 gears, Tremec 3550 tranny,Lakewood drag suspension-90/10 in front and 50/50 in the back. Lakewood traction bars. Edelbrock 70mm tb, K&N filter, Kirban fuel reguator, Custom sub-Frame connectors,83 lb squirters, powerdyne blower with 12psi pulley, http://www.pumpoperators.com/brian/ Rice Haters Club Member #82 My wife is AWSOME!!!!!!!!

06-26-2003, 09:41 PM	#12
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	What codes did you get? If you haven't read them yet, why would you just start replacing parts that may not even have a problem? There are a bunch of things that can cause a rough idle. __________________ 351W 89 Mustang GT Convertible

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