Explorer won't start in cold!!
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From: mass
Explorer won't start in cold!!
Have a 91 Exp 4.0 v6, has a no start problem only in the cold weather. Last year, replaced coil pack, fuel pump, crank censor, this winter...same problem. Just will not start when it is cold. No codes, no ck engine. Checked it today...it has no spark. Veh belongs to a friend of mine, he is out of money and out of patience. Does anybody have an idea what could cause this? Fuel filter has also been changed. told him to ck crank position censor connector.
He's going to check it in the morning. Appreciate any help.
Thanks
He's going to check it in the morning. Appreciate any help.
Thanks
Postmaster
Joined: Dec 2001
Posts: 3,742
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From: UT
What kind of no start -- the kind where the starter doesn't turn or barely turns, or the kind where the starter is doing just fine, but the engine refuses to catch? If the latter, does it have good fuel pressure (~40 psi) while trying to start?
Logistics Pro
Joined: Jun 2009
Posts: 4,817
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From: Cedar Rapids, IA
A bad CKP (or one with too large of a gap) will not prevent the starter from cranking the engine, it would just prevent a reliable spark (and hence no start).
I don't have the factory service information for the 1991 model year and I'm unable to find details on the correct spacing. It's probably something like the thickness of the cardboard box material a new sensor comes in. This model year is around the time when Ford was still using an ignition module and camshaft position sensor in the distributor. Are you sure this Explorer has a CKP sensor? If not, ignition modules were pretty common failure items.
Edit: I checked the manual for the 1992 Explorer 4.0L and it does use a CKP sensor (called the VRS) along with an Electronic Distributorless Ignition System (EDIS) module. You might see if your local parts store still have a tester for the ignition module in your truck.
-Rod
I don't have the factory service information for the 1991 model year and I'm unable to find details on the correct spacing. It's probably something like the thickness of the cardboard box material a new sensor comes in. This model year is around the time when Ford was still using an ignition module and camshaft position sensor in the distributor. Are you sure this Explorer has a CKP sensor? If not, ignition modules were pretty common failure items.
Edit: I checked the manual for the 1992 Explorer 4.0L and it does use a CKP sensor (called the VRS) along with an Electronic Distributorless Ignition System (EDIS) module. You might see if your local parts store still have a tester for the ignition module in your truck.
-Rod
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From: mass
He went to the parts store and they told him that vehicle isn't equipped with an ignition module. But I don't understand that because all of them had to have some type of ignition module but being distributorless...i dont know.
Jeff
Jeff
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Postmaster
Joined: Dec 2001
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From: UT
Someone at the parts store is confused. It most definitely does have an ignition module (usually called ignition control module or ICM) that should be located next to the battery and radiator.
One of the first things I would suggest would be check the power and ground to the ICM.
Another test, especially if does seem to be in the ignition system, would be to pull codes from the computer. Some faults in the ignition system will leave trouble codes in the computer's memory.
One of the first things I would suggest would be check the power and ground to the ICM.
Another test, especially if does seem to be in the ignition system, would be to pull codes from the computer. Some faults in the ignition system will leave trouble codes in the computer's memory.
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