94 Explorer Problem With Warm Starts

[Wolfie_85]

So, I don't have it yet, but my mom drove it today and tried to start it after being off for just a few minutes, and it wouldn't start. She waited ten minutes and tried again, it started right up.

Without looking at it myself, I'm wondering what it could be. When I go to pick it up, I have to drive it 300 miles!

 

[larrydd999]

It could be quite a few things, but I'd suggest the starter brushes are almost to the end of their life. I've seen the same problem with forklifts that get a lot of use in a day and are turned off between uses. It's almost always the starter or a loose connection in the start circuit.

 

[arco777]

What do you mean when you say it wouldn't start? Did the engine crank over, or nothing when you turned the key?

Common faults of no crank include corrosion of the battery terminal connections, internal corrosion of the battery cables themselves, or starter issues as mentioned above.

If it cranks but does not start, check for spark, and check for fuel pressure. Then go from there.

 

[cgbier]

Engine drowned?

 

[Wolfie_85]

You hear the starter engaging normally, but the engine doesn't start. It has a newer starter, so that's not likely. Then, ten minutes or so after leaving it alone, it starts no problem.

 

[Wolfie_85]

If by drowned you mean water, nope!

 

[arco777]

I would start by checking fuel pressure during a hot start situation. You should see 30-40 PSI at the fuel rail test port when the pump primes the system (key ON, before turning to START).

 

[cgbier]

If by drowned you mean water, nope!

Nope, I meant drowned in gas. But I don't think that can happen with EFI engines.

 

[Maniak]

Nope, I meant drowned in gas. But I don't think that can happen with EFI engines.

It can with leaking injectors.. To check this you would pull the plugs after parking the vehicle. Let it sit enough to when it would have the issue, then pull the plugs. If they are wet an injector is leaking..

That could also cause starting issues because you might not have enough fuel pressure when you start. If turning the key on/off/on/off/on and then starting it make it start better then the fuel pressure isn't high enough when it starts. This issue is normally a cold start issue, not a warm start though.

~Mark

 

[FR-425]

It's the temp sensor for the PCM

The one "near" the thermostat housing for the PCM looks like this.

It is a bad Temp sensor.

http://www.rockauto.com/catalog/moreinfo.php?pk=951148&cc=1119631

Been here, done that already on the 94.

It's flooding because the PCM "thinks" it is a cold engine.

There are (2) sensors, so make sure you change the one that has a cone on the end of it, next to the thermostat housing.