b-3000 check engine code p0301

[bgreen1922]

I was refrenced to this site from a member of ford-trucks.com. Hop I can get some help.

98 b-3000 4x4 manual started running terrable. Shaking like crazy. Engine light came on. Took it to auto zone to have the code read and it was p0301. They told me cylinder 1 misfire. Suggested new plugs and wires.

So put new plugs and wires in. Didint solve anything. While I was working on it I disconnected the battery and now the check engine light if off but I am sure it would come back on once it is driven more.

Next step is removed the plug wire from the plug on cylinder #1 and put an old plug in it. Turned the truck over and got no spark. I did the same thing to plug wire on cylinder #3 and got a spark. So I am not getting a spark on cylinder #1.

Next step is took the coil pack to Autozone and they tested it and they said it was working properly.

So now what? Still no spar but dont know what to do next.

Please Help!

Thanks guys.

 

[modelageek]

I don't own one of these engines but maybe i can help get the ball rolling. are you sure the wire for the #1 cylinder was fine? the coilpack checked out ok. Do these have an ignition module or is it part of the pcm? I don't think it would matter but did you reboot the pcm(disconect the neg bat terminal) after all the new wires plugs and coilpack was put back in. did the truck run any better?

 

[bgreen1922]

I don't own one of these engines but maybe i can help get the ball rolling. are you sure the wire for the #1 cylinder was fine? the coilpack checked out ok. Do these have an ignition module or is it part of the pcm? I don't think it would matter but did you reboot the pcm(disconect the neg bat terminal) after all the new wires plugs and coilpack was put back in. did the truck run any better?

Yes, I checked the wire with a multi meter and it is ok. I did not disconnect the battery after I had the coil pack checked out and its ok.

I will go disconnect the battery for a while and give it another try. any idea how long it needs to be disconnected for to reboot the computers?

Not sure about the ignition module or pcm. Not real familiar with this truck (its my girlfriends) but I have searched otheford sites and the web but have not come up with much.

Thanks.

 

[masterbrenden]

when in doubt change a wire, it may help
or you may have a dead hole, have you tried a compression test

 

[modelageek]

have you tried a compression test

I dont think it is a compresion issue, He does not have a spark on cyl #1.

 

[bgreen1922]

I already changed the wires and plugs. I also re tested the wires with a multi meter and they are ok. I had the battery disconnected for a few hours last night and when I reconnected it it still is not running any better.

I could try compression but I really dont know how to do that. do i have to remove all the spark plugs to do that?

 

[modelageek]

If you don't have a spark ar lpug #1. The problem is the no spark. It is not a compression issue. Do NOT bother with a compression test. I would search why you are not getting a spark

 

[bgreen1922]

I took the #1 plug wire off the coil and started the truck. I tested with a test light and i get nothing, even when the truck is reved up. I did the asme with the #5 plug wire and I get spark. So what does that mean?

 

[bgreen1922]

I just checked the compression. 148 psi so that seems fine.

 

[modelageek]

it is not the compression. just some thoughts. you have no power at the #1 socket on the the coilpack. you tested the coil pack and it is is fine. so lets figure out why it is not working. I think your ignition module is part of the pcm. I would start looking into that. is there a leak around where the pcm sits. are all grounds and screws fastened correctly on the coil. is there a junkyard around that you can get a used pcm cheap. could the crankshaft cause just one cylinder not to fire.

 

[bgreen1922]

it is not the compression. just some thoughts. you have no power at the #1 socket on the the coilpack. you tested the coil pack and it is is fine. so lets figure out why it is not working. I think your ignition module is part of the pcm. I would start looking into that. is there a leak around where the pcm sits. are all grounds and screws fastened correctly on the coil. is there a junkyard around that you can get a used pcm cheap. could the crankshaft cause just one cylinder not to fire.

Where is the pcm? what does it look like? is there any way to test it? Coil is fast fastned good. Had it off to bench test it and re installed it. I will try to find a junk yard...

No idea about the crank question you have.

Thanks!

 

[modelageek]

Where is the pcm? what does it look like? is there any way to test it? Coil is fast fastned good. Had it off to bench test it and re installed it. I will try to find a junk yard...

No idea about the crank question you have.

Thanks!

You need to invest in a manual. the pcm slides into the firewall on the passenger side at the top. follow the bundle of wires. disconnect the neg battery terminal if you pull it. see if there is a leak around it. I usually never suggest a pcm but i am wondering in your situation of you should investigate it.

 

[Rearanger]

I think you need to verify if it's the coil pack, I don't trust parts store guys.

But first you can see if it's not the PCM. You'll need to locate the harness connector for the coil pack. You'll then need to determine which pin is the ignition start/run pin (there should be 4 pins?). I don't have your year so can't say which pin it might be. Mine's on the outside of the connector on left viewed as connector into coil pack connector. With KOEO measure voltage between IGN/START pin and ground - is it greater than 10v? If yes then connect test lamp between IGN/START RUN pin and the corresponding pin for cylinder #1. (mine is on far right opposite IGN/START RUN pin). Disable fuel pump. Crank engine while looking at test lamp. Did lamp blink consistently - if yes it's probably your coil pack, but you'll have to measure resistance of pins to determine further if it's the PCM and I think that's beyond your test ability. Either way you'll need a pin diagram. If the test voltage was not 10V or greater on the IGN/START RUN pin then you'll have to trace why.

 

[modelageek]

Where is the pcm? what does it look like? is there any way to test it? Coil is fast fastned good. Had it off to bench test it and re installed it. I will try to find a junk yard...

No idea about the crank question you have.

Thanks!

You need to invest in a manual. the pcm slides into the firewall on the passenger side at the top. follow the bundle of wires. disconnect the neg battery terminal if you pull it. see if there is a leak around it. I usually never suggest a pcm but i am wondering in your situation of you should investigate it.

 

[nick344]

It sounds like a bad coil. I and the same issue with a 2000 model. Running terrible and setting #1 misfire code. Altough I had spark the coil was bad. replace with a new one and ihas been running great for the lady.