Help!

[DUNE RCR]

So after replacing many parts now I'm at a loss. My truck decided to not start the other day and I have no spark. I am gettin fuel however.

I have replaced coil packs, plug wires, plugs, crank position sensor, camshaft position sensor and checked all fuses and relays.

I'm at a total loss right now and need my truck for tomorrow morning. Any input would be greatly appreciated.

Truck info: 99 xlt 5.0 awd ran Thursday night wouldn't start Friday morning.

 

[DUNE RCR]

Any help would be great. I really need my truck for work in the morning.

 

[DUNE RCR]

Anything? I would like to get my truck up and running here soon. Any help at this point would be greatly appreciated.

 

[Lefty2053]

Does it turn over? Or just a clicking sound?

 

[DUNE RCR]

It does turn over. It does everything its supposed to except spark. I have tested both coils and they are working. I have replaced the cam and crank sensor, new plugs, wires and packs and still no spark. I'm at a loss cause I have gone through everything by the book(Chilton's). It has good compression across all cylinders. Its a problem with the ignition circuit, I just cant figure it out and was hoping someone else has had this problem and had a fix for it.

 

[Turdle]

OK, while this may seem like a waste of time I assure you it isn't. Something in the "flow" of things was missed.

I strongly urge you to take a breath, back up and perform this procedure. Pay close attention to all details.

http://www.explorerforum.com/forums/showthread.php?p=2352806

Forget about the things you replaced for now, it may cause you to ignore the obvious.

 

[DUNE RCR]

I found that post already and did all those steps. Everything works as its supposed to. Just still have no spark from the coils.

On another note I was wondering when you would chime in turdle. You are a god of information on here.

 

[DUNE RCR]

I found that post already and did all those steps. Everything works as its supposed to. Just still have no spark from the coils.

On another note I was wondering when you would chime in turdle. You are a god of information on here.

 

[Turdle]

ok, let's try a few things right quick

Grab an 11mm socket, remove the PCM connector at the firewall, and then re seat it tightly. ( hoping to fix a bad connection in the plug)

Try starting the truck while holding the accelerator to the floor.

Check if the crank pulley is actually spinning ( the trigger wheel part)--I know this is a sohc thread, but look at this one

http://www.explorerforum.com/forums/showthread.php?t=267709&highlight=balancer+belt

 

[Turdle]

You are a dog of information on here.

Fixed a post too

 

[DUNE RCR]

I'll check that as soon as I get home from work later.

 

[Themightyquinn]

Possible weak starter or not enough voltage goin to the starter. I know it its difficult to to measure voltage and amperage at the starter with one person. Have you checked ALL electrical wiring and cleaned all electrical contacts? I know you said you were getting fuel, but did you mean you checked fuel pressure? Best of luck.

 

[DUNE RCR]

I'm getting roughly 60 psi fuel pressure at the rail. My starter is only about 3 months old and is cranking the engine up to a decent speed, no change from before. My battery has about 13.5v at the time I was cranking(optima red top) and fully charged before I try cranking everytime(charge it every night so in the morning its ready).

 

[DUNE RCR]

This is why I'm totally confused as to what is going on here. I have never personally seen this happen before without it being a sensor or bad coil.

 

[DUNE RCR]

So my crank trigger ring(idk what it's actually called) is fine. I also removed my cam sensor to see if the gear had sheared by chance, nope solid. I rechecked the voltage going to the coil packs and tested fine. I'm now completely lost.

 

[DUNE RCR]

Are the coil packs supposed to be grounded through the plate or not? What I mean by that is would it be better if the plate where bare metal or stay painted?

 

[Turdle]

Yes, the coil packs ground to the bracket.

 

[DUNE RCR]

Ok that's what I figured. I read somewhere on here where someone had a similar(not total loss) issue with spark on a v6 and they just cleaned all the rust and whatnot away and their truck ran way better. I have duty tomorrow so I will have to work more on this Wednesday.

Thanks for all the input. I will update when I clean off the plate and reassemble everything.

 

[DUNE RCR]

So a little update... Still no spark. I ground the mounting bracket to bare metal and cleaned the coils mounting surfaces spotless and still I have nothing. I give this thing one more week of tinkering and it will have to go to the stealership for diagnostics. I'd rather not go that route as I don't have the money for that plus I have always done all my own work on all my vehicles.

 

[DUNE RCR]

So I still have nothing. I refuse to take it to the stealership as they want $280 just to connect it to a computer and diagnose it.