4.0 Stalling when cold???
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4.0 Stalling when cold???
My '92 just got fresh plugs and wires but is still stalling when its not completely warmed up. I can let it warm up for ten minuets but when I accelerate from a dead stop at the first stop sign it will die about half the time. I live near Dallas, so we're not talkin serious cold. It was 70 yesterday.
(update) I also just put in a new thermostat (192 degree) so that shouldnt be the problem. I used to think the problem was related to the amount of fuel in the tank (less fuel = more problem) but I have recently determined that's NOT the case. If I slooowwly ease into the gas it will do OK, but if I give it any serious gas, it will stall.
Any ideas???
(update) I also just put in a new thermostat (192 degree) so that shouldnt be the problem. I used to think the problem was related to the amount of fuel in the tank (less fuel = more problem) but I have recently determined that's NOT the case. If I slooowwly ease into the gas it will do OK, but if I give it any serious gas, it will stall.
Any ideas???
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Joined: Jan 2002
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From: suburban atlanta
three thoughts: 1)disconnect the MAF connector, and see if it helps. That puts it into default.
2)check the ACT sensor.. (air temp coming in)
3)checkt the CTS (coolant temp)
4)(i lied0 check the IAC for being sticky
and 5) Most likely: the O-rings between the parts of the intake are hardened, and only seal up when the engine has warmed up. There are an upper set and a lower set. Do both. I think there may be a TSB, but I don't own one, so didn't check. It is cheap, relatively.
tom
2)check the ACT sensor.. (air temp coming in)
3)checkt the CTS (coolant temp)
4)(i lied0 check the IAC for being sticky
and 5) Most likely: the O-rings between the parts of the intake are hardened, and only seal up when the engine has warmed up. There are an upper set and a lower set. Do both. I think there may be a TSB, but I don't own one, so didn't check. It is cheap, relatively.
tom
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Thanks for the suggestions Tom, but...
Where is the ACT and what is the IAC???
I've disconnected the MAF and that didn't do much.
O-rings, do you mean the rings at both ends of the plastic intake snorkel? Those seem to be in good shape. No serious hardening.
Thanks.
Where is the ACT and what is the IAC???
I've disconnected the MAF and that didn't do much.
O-rings, do you mean the rings at both ends of the plastic intake snorkel? Those seem to be in good shape. No serious hardening.
Thanks.
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Ok, I figured out what the IAC is by reading the Acronym Definitions (I'm catchin' on...) and I'm gonna clean it out this weekend, but I can't find anything about the ACT. Where do I find that?
Thanks for the help...
Thanks for the help...
Logistics Pro
Joined: Jan 2002
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From: suburban atlanta
6) check your fuel pressure & volume. You DO have a clean (relatively) fuel filter, right?
The ACT will be a screw-in to the intake manifold with 2(i think) wires going to it. If you pull it out, it will have a loop of metal protecting a probe down in the middle. It is a temp-variable resistor. It in effect simulates the bi-metal on old carb chokes. Cold, add more fuel, Warm, don't need so much. With the TX temps, and your symptoms, it's probably OK, as it has more effect in northern climes.
tom
The ACT will be a screw-in to the intake manifold with 2(i think) wires going to it. If you pull it out, it will have a loop of metal protecting a probe down in the middle. It is a temp-variable resistor. It in effect simulates the bi-metal on old carb chokes. Cold, add more fuel, Warm, don't need so much. With the TX temps, and your symptoms, it's probably OK, as it has more effect in northern climes.
tom
