96 villager miss fire when hot

[divot91]

runs great when its stone cold, but, when it warms up to regular op temp it kicks and bucks any ideas? it has 196k miles, 3.0l just changed plugs, thanks in advance

[tempfixit]

Have you ever changed fuel pump????? Check fuel pressure with a gauge after fuel filter, if you can tape it too windshield wiper and observe from cold to warm up to see if you are losing fuel pressure.

ANother thing to check is the coil, you could try using a hair dryer and heated up the coil when the engine is completely cold and see if it acts up then.

ANother thing is remove distributor cap and rotor, then plate in distributor to see if there is any dust on the optical sensor (camshaft sensor), if so the bearing on shaft is going south and will need to replace distributor, the optical sensor could also be faulty.

hope this helps

PM sent

[danielsatur]

How old are the spark plug wires?

[divot91]

not sure how old the wires are, just got the van just recently, they dont look to new, i did find out that the mounting brackets for the coil are broke and the the coil is just laying there, that cant be good. and i tryed to locate the fuel rail valve but cant seem to find it, would i have to tap in to the rubber fuel line to check pressure?

[tempfixit]

THere is not a valve on the fuel rail, just hook up a gauge after the fuel filter just us another piece of hose to connect it to the fuel filter.

[danielsatur]

Mount your coils, and lift your hood up at night!
Do you see any sparking with the engine running.

[divot91]

i will try that tonite, old school stuff, pops taught me that

[divot91]

sorry for the delay on info, bunch of drama around here, tryed new fuel filter and looking at the wires in the dark, no sparks at night and filter didnt do anything. i have a feeling its the pump, or, the optic in the dist.

[divot91]

anyone know what the fuel pressure is suppose to be?

[tempfixit]

Originally Posted by divot91

anyone know what the fuel pressure is suppose to be?

36 to 38 psi

[danielsatur]

If not sure about the wires, it's probably worth replacing, because silicone wires will break down.

[divot91]

inside the dist. cap dont look all that great, under the cover inside the dist. looks brand new, ill try cap, wires and rotor and see if that helps, last resort is the pump which i am not looking forward to

[divot91]

could this problem be that the timing is off?

[tempfixit]

I do not believe the timing would be off unles timing belt has slipped. I would check the fuel pressure regulator to see if there is any gas in the vacuum line, if so replace regulator. If you don't check the fuel pressure you will be just guessing and throwing money at the problem without a fix. Timing should be 15-17 degrees.

[danielsatur]

Had a bad ignition module, that would cause the timing togo bad when it got warm.
Took the module off , and Advance Auto tested as being bad! the problem was resolved with a new ignition module.