Having trouble when cold.
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Having trouble when cold.
I have a '97 2.3
Any ideas for why the truck will want to die at stop signs only when cold? its a problem i've had for a long time now. as soon as i hit normal temp it runs great.
It idles smooth at start-up and runs fine until i let off the gas and come to a stop. then it chugs and tries to die unless i keep the rpm's up.
- i replaced the idle air control valve but it didn't help.
- i have a pretty new mass air flow sensor so i know it's not that.
- no check engine light or pending codes
- i've done the cold & warm idle relearn routine and while i want to say that maybe it is a little better, it still wants to die at stop signs.
- it doesn't seem to stay on high idle when i start it and its cold. (but its been so long now i'm not sure i remember what it should sound like)
Any ideas for why the truck will want to die at stop signs only when cold? its a problem i've had for a long time now. as soon as i hit normal temp it runs great.
It idles smooth at start-up and runs fine until i let off the gas and come to a stop. then it chugs and tries to die unless i keep the rpm's up.
- i replaced the idle air control valve but it didn't help.
- i have a pretty new mass air flow sensor so i know it's not that.
- no check engine light or pending codes
- i've done the cold & warm idle relearn routine and while i want to say that maybe it is a little better, it still wants to die at stop signs.
- it doesn't seem to stay on high idle when i start it and its cold. (but its been so long now i'm not sure i remember what it should sound like)
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From: SW Va
OK, so the only clues we have to go on is it seems to be temp related & the idle relearn helped a little, but not much.
SO, without a scantool that can read live PID feeds to & from the computer, we're gonna have to do some trouble shooting guessing & since it seems to idle ok when warmed up, I'd maybe begin by having a look at the computers coolant temp sensors resistance/ohms value when its cold, to see if its giving the computer a corrupt input about true engine temp when its cold. Here is a link for resistance & voltage values to look for, so break out your multimeter & let us know what you find. Fuel Injection Technical Library » Engine Coolant Temperature Sensor (ECT)
SO, without a scantool that can read live PID feeds to & from the computer, we're gonna have to do some trouble shooting guessing & since it seems to idle ok when warmed up, I'd maybe begin by having a look at the computers coolant temp sensors resistance/ohms value when its cold, to see if its giving the computer a corrupt input about true engine temp when its cold. Here is a link for resistance & voltage values to look for, so break out your multimeter & let us know what you find. Fuel Injection Technical Library » Engine Coolant Temperature Sensor (ECT)
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tomtoc
1983 - 2012 Ranger & B-Series
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Feb 27, 2007 10:45 AM
