crank but no start!

[13kidd]

Yesterday my truck was starting very hard to the point where it would barely turn over but it would start. I parked it in the garage overnight and this morning I installed a new battery and now all the truck does is crank and crank and crank and doesn't even try to start.

I bought a new coil pack and still no luck. So I break out the multimeter and at the 12v source of the plug for the coil pack I'm at around 12 volts when key is in on position and around 10 volts when cranking but when I would test the individual towers on the coil pack there was no power to any of them when cranking over.

Just a random thought maybe it could help diagnose this, but probably about 3 months ago I seafoamed my truck (only put it in through the brake booster, none in crankcase or gas tank). And I realized my gas mileage went down considerably which was no big deal since the seafoam probably fouled the O2 sensors but I still haven't replaced them due too money issues. So could the O2 sensors be bad and keep the truck from starting? Truck also has brand new spark plugs AFTER seafoam was done.

 

[13kidd]

Bump, any thoughts or recommendations help right now!

 

[TxGasRacer]

http://troubleshootmyvehicle.com/ford/4.0L/how-to-test-a-no-start-condition-1

 

[AllanD]

As any fireman (or boy scout) can tell you to have fire you need air, fuel & a source of ignition.

A mechanic will say air, fuel & spark.

Diagnostic procedure always starts with the simple, then gets to the details...

AD

 

[Heavyfire14]

As any fireman (or boy scout) can tell you to have fire you need air, fuel & a source of ignition.

A mechanic will say air, fuel & spark.

Diagnostic procedure always starts with the simple, then gets to the details...

AD

Pretty much..

Screwdriver in a spark plug wire and close to some bare metal. Then next would be to use a fuel pressure guage and see how much pressure it has if any. And if it doesnt then make sure you check your lil fuel reset button on the passenger side floorboard. Then if everything checks out the get a pressure tester and test all your cylinders.

Sent from my LGLS885 using Tapatalk

 

[13kidd]

So last night I took each spark plug out and tested for a spark and they were all firing off with the old coil pack so I was back to square one not knowing what my problem was. So I decided to reinstall the new coil pack I bought yesterday since I cant return it and what would you know, even though I had already tried the new coil pack and it didnt work for some reason, the truck fired right up and I have not had a problem starting it or running since. Thanks for all the tips everyone, this truck just likes to keep me on my toes.

 

[txgocartB3000]

Sounds like there might be a loose wire/connection in the general area.

As you are removing and replacing parts it gets moved and contact is restored.

Wear electricians gloves and start moving wires.

Ray

 

[black_demon69]

Sounds like there might be a loose wire/connection in the general area.

As you are removing and replacing parts it gets moved and contact is restored.

Wear electricians gloves and start moving wires.

Ray

try the coil pack connector just wiggle it a bit . I have seen them go bad or get dirty and then coil doesn't produce any sparkles from time to time.

 

[enjr44]

If it were mine, I would keep fiddling with it and try to get it to do it again so you can really fix it.

Otherwise, there may come a dark and stormy night when you are standing out in the rain wiggling stuff saying, "What the heck do I do now!!"