ok first thing first my mechanic is sayin might need to have my computer flashed that that might be the cause of my misfire as they cant seem to find anything else right now has anyone experienced this before and how do ur computers just go bad. Also does anyone think my edge could have something to do with it, however it does the same thing set to stock and when not plugged in. Please read my last thread " misfire under load"

 

Change your autolites to Motorcraft and see how that works out.

You are getting duped at the garage. This is a tactic for unsuspecting people when they come in to the shop.

Plugs are much cheaper than a PCM.

 

yea im doin the plugs in the morning but it is weird that my check engine light still hasnt come on and it is a bad mis under load but they didnt say that i needed a computer jus my current flashed but i thought i could do that with my edge i dont kno

 

I think that is a bonus that is optional on the EDGE. So, look back in your info, and see.

Since you are going to replace the plugs in the morning, disconnect your battery the entire time you are doing that. This will force your computer to relearn the cycle all over again. (AKA-poor man flash of the computer)

Remember to use plenty of dielectric grease. Let us know how it goes.

Good Luck!

 

My 06 5.4 Was Doing The Same Thing. You Could Hook It Up To A Computer It Would Show A Misfire But No Check Light.when I Finally Got It To Throw A Code It Was A Random Misfire. Changed The Plugs And Running Good Again.

 

ok so he showed me today "the mechanic" they had it hooked up to like there ten thousand dollar mac scan tool he had it in gear power brakin it and it was mis firing like crazy and the scan tool is reading no mis fires lol this is why he is tellin me it might be my computer he says.

 

OK, go replace your PCM and see if it helps.

Evidently trial and error from other people's past experiences don't apply to you.

I hope you don't do this with your chain of command. It is your check book not mine!

 

Was he in mode 6?

 

Woah take it easy, he is here for HELP, as he doesn't know the cause. The TECH said it could be the PCM, he is concerned not knowing any better.

 

why blame it on Edge or even mention it. just return to stock to see if the Edge makes a difference

 

 

so she has all new mtrcraft plugs, and all the coils been stress tested they all came back fine and i still have a horrible mis under load. This engine only has 2500 miles on it does any one think one of the valves could be stuck open thats another theory they are givin me

 

Does the {{{Check Engine light}}} illuminate in the "Key On" position?

Is it functional?

When driven normally, 1/2 throttle, what RPM/load range does the misfire occur?

Answer as accurately as you can, if you can't recall - say so.

 

yes the service engine light soon does come on and also i have the edge it reads nothing and i also have access to the mac tool scanner it reads nothing. it wont trip a code and it has been 3 days now

 

Have you set the edge back to stock ? Is there a program removal process with that tuner ?


When driven normally, 1/2 throttle, what RPM/load range does the misfire occur?