Rough idle when cold

Mustang_289 · 01-22-2002, 03:16 PM

Our stang runs really rough when it's cold. We took it out today and really ran bad - to the point where it wouldn't stay running.. It actually gives the indication that it's flooded. Let it sit for a while and was able to get it started and idling. Seems like when the engine got warmed up - it ran better. When we got the car it had about 1/2 tank of gas - not sure if there's any water in it or how long it's been sitting. Topped it off today with some high-test and put some fuel anti-freeze in the tank.

Does anyone have any ideas on what I can check to perform process of elimination? I'll be putting on a new fuel filter to see what that does. I've seen posts about the TPS voltage could that be something to check - if so where do I check - and what voltage should I be seeing?

Thanx for any help with this one!

PatrickMx · 01-23-2002, 09:13 AM

Check the TPS. .91 at idle and 4.6 at Full throttle. Check between the green and black.

95mustanggt · 01-23-2002, 10:54 AM

It sounds like you just got the car. I would give it a good tank of fuel or 2 first. Also give it a tune up. Change plugs, wires, PCV, fuel filter and check out the distributor cap.

You can check the TPS and IAT sensors too. But I'd do a tune up first.

Mustang_289 · 01-23-2002, 11:34 AM

We got the car in August and my son and I have been putting it back together - great project! We do have new plugs, plug wires, distributor cap, and rotor. Just got a fuel filter to put on trying to figure out best way to replace - without getting soaked with gas (another post). I'll do the PCV volve.

What are the IAT sensors you're talking about?

Mustang_289 · 01-23-2002, 02:28 PM

Man - I'm full of questions today, where is the PCV valve on an 88GT with EFI?

01-22-2002, 03:16 PM	#1
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	Rough idle when cold Our stang runs really rough when it's cold. We took it out today and really ran bad - to the point where it wouldn't stay running.. It actually gives the indication that it's flooded. Let it sit for a while and was able to get it started and idling. Seems like when the engine got warmed up - it ran better. When we got the car it had about 1/2 tank of gas - not sure if there's any water in it or how long it's been sitting. Topped it off today with some high-test and put some fuel anti-freeze in the tank. Does anyone have any ideas on what I can check to perform process of elimination? I'll be putting on a new fuel filter to see what that does. I've seen posts about the TPS voltage could that be something to check - if so where do I check - and what voltage should I be seeing? Thanx for any help with this one!

01-23-2002, 10:54 AM	#3
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	It sounds like you just got the car. I would give it a good tank of fuel or 2 first. Also give it a tune up. Change plugs, wires, PCV, fuel filter and check out the distributor cap. You can check the TPS and IAT sensors too. But I'd do a tune up first. __________________ 1995 Mustang GT 20016 F150 Lariat Super Crew

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01-23-2002, 09:13 AM	#2
PatrickMx Registered Member Join Date: Jan 2002 Location: Mississippi Posts: 23	Check the TPS. .91 at idle and 4.6 at Full throttle. Check between the green and black.

01-23-2002, 11:34 AM	#4
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	We got the car in August and my son and I have been putting it back together - great project! We do have new plugs, plug wires, distributor cap, and rotor. Just got a fuel filter to put on trying to figure out best way to replace - without getting soaked with gas (another post). I'll do the PCV volve. What are the IAT sensors you're talking about?

01-23-2002, 02:28 PM	#5
Mustang_289 Registered Member Join Date: Sep 2001 Posts: 512	Man - I'm full of questions today, where is the PCV valve on an 88GT with EFI?