fordguy2100

Sorry had a long day... Was kind of vague. I was referring to the torque pro app; which monitors (meters popped into my head because you choose dial meter, half meter, etc and then what you want to monitor) should I choose to look at to find a misfire. Also my evaporative system check keeps saying incomplete. Is that a related issue?

jprevat

iTrader: (1)

Just run test results and look at $53 tests 01-08

fordguy2100

Ok, yeah my problem is the miss is very intermittent. Happens usually when I'm lower on gas or the truck has sat for a week (I travel for work so it sits for a week at a time. Only had cold idle. But as soon as I drive and get above 1500rpms or 20mph the miss will go away and not come back for a while. Every like 5th time I have the miss the cel comes on and then goes off after 50miles. Usually a p0304 but all new motorcraft plugs/cops. Injectors were inspected (still within spec) and cleaned. Ran some Lucas oil fuel treatment. Compression test failed, but barely and only failed 1/3 times it was tested. Fuel pressure has been checked multiple times by a garage and even when they are able to get the rough start they can't diagnose the problem. Have tried the "turn the key on to let the pump prime" and didn't help. Also replaced fuel pump and gasket and all hoses down there. Triple checked for any leaks down there. At a loss here

jprevat

iTrader: (1)

Im leaning toward compression. The next time you are gone for a week and come home pull #4 and put a cap of oil in the cylinder. It wont hurt anything but will bring compression up for a short time.

If it still misfires I might would have to start checking the wiring or consider the pcm.

fordguy2100

So if the oil helps, I'll be looking to get a new head gasket? Thanks I'll actually be going away tomorrow so hopefully I can diagnose this when I get back.

Another note that might be related is I also have the same intermittent rough start. It will turn over for anywhere from 3-10seconds but it's never failed to start. It doesn't matter on the gas level or how long the truck has sat, it's just completely random. Also doesn't coincide with the misfire either; sometimes they happen together, sometimes they don't.

Jbrew

So, how are you determining low compression ? Just curious, you didn't post any numbers.

I'm assuming..well, how did yuh do it man man ?

... Have you seen this one yet ? -

http://www.f150online.com/forums/art...ng-proper.html


BTW- The PCM kills the rail/injectors right after 4 seconds if she hasn't fired yet. That's consecutive crank. It resets right away. The way it reads, if it doesn't start within 4 seconds, switch the ignition off then try again. It's programmed that way to protect the converters...in case you were unaware.

fordguy2100

I don't have the numbers with me, it was tested a few months back when my truck was in the shop, but the mechanic had said they failed and I recall the lowest number was not within 75% of the highest number. I have not seen that post yet but I will definitely read it and see what I can do. Thanks

fordguy2100

So any idea as to why it's not cranking over within 4seconds? I was not aware it did that

jprevat

iTrader: (1)

I would consider it. The PO of my red truck said it would do it completely random from time to time. He said you could crank and crank but let it sit a minute and it would fire right up. It now has a P01633 and I am going to have to get the PCM checked out after I make sure my #55 pin in the pcm harness is getting continuous voltage.

wernerj16

Hey guys go the bluetooth adapter today. Ran it but idk if I need more info in my settings? Here are my settings. And the data I got. Not sure if I should have left it run longer or not. Can any help me out?