5.4 missing.... COP's??
 

Guys my 01 5.4 has 56700 and is supercharged and was running fine on Troyer tunes till this morning..I took a second to fire up this morning and then was running rough I took it around the block and really noticed the miss under acceleration so I pulled over and loaded my bad gas tune just incase. but was still there after loading the tune. on the way back to the house it seemed to go away and started running fine for a min or two and then came back just as fast... No CEL or codes to read..Fuel pressure gauge readings look good and the Wideband is reading a little rich ..

I suspect it's the COP's but was looking for advice as I lost my job last week and don't need to throw parts at it...

so do you guys think the COPs are suspect or should I be looking some where else ???

Update
 

Used the truck to take my little one to school.. when it first started it ran rough I let it idle for approx 10-15 mins and drove him to school and all was well so I drove around for about an hour and still running fine .....WTF any ideas ??? Bad gas maybe??? last time I filled up i did not use Chevron Fuel

When was the last time you changed the fuel filter?

Its been raining here in Utah allot. Your problem is almost certainly due to moisture on your coils. Might go away when it drys out but probably not. You should probably get them cheap E-nay coils and dielectric grease them to water proof them and you'll be good.

glc the fuel filter has alittle more than 6k on it....and the pressure seems to be fine via the readings on my autometer gauge. I should be good for 14k more right??

jethat I didnt drive it the couple of days it rained..but I understand what u mean..

I drove it agian tonite still no CEL .. while the truck was idling I heard it miss 2 times but the drive home was fine.

dont mater if you drove it or not. Moisture gets in there and your screwed. Might dry out if it ever stops raining.. more scheduled for tomorrow..

i agree. saturday we had storm that actually created a tornado about 10 miles from me, but sunday morning i got a code for a misfire on cylinder 1. today i took the coil out and and cleaned it up a bit, wiped it down, and put it back in and its running a ton better. it was missing really bad in overdrive between 40-45mph but it now its fairly smooth and not throwing codes.

im thinking about going ahead and buying a set of coils just incase it goes bad.

Almost a year later .......So I never did get new COP's the miss went away till today:mad: but now its 3 times as bad still no cel but my wideband is reading lean during the miss. I thought a miss do too no spark would make me run rich :confused: Are the COP still the most likely problem?? or more like a injector ???:coffee:

Try pushing it hard when it starts to act up, that's most likley the only way you'll generate a DTC pointing you towards the faulty coil.

Other than that, just replace them all -

http://cgi.ebay.com/ebaymotors/NEW-I...Q5fAccessories

what he said above is a bad idea.if you are running lean then its bad to get on it especially being s/c.that could be very bad.
i suggest that you unplug one coil at a time with the engine running and see which coil,if any are bad.pull and check your plugs,read their condition.i just had a problem almost like yours, it turned out to be bad cops,i put on new accels and wow what a difference.i also replaced my plugs with motorcraft 479's.good luck

No, what I said above is a good idea. Pushing the motor at the bad spot can generate a DTC. The misfire monitor count will increase, in-turn can forward that bad cylinder #. What you propose NEVER works. In theory it should, but if you new these engines, you would support what I'm saying. The engine would have to be severely missing @ idle and this doesn't happen unless you have Primary failure. With Primary failure, you have a CEL or MIL always.

Also - Sorry, -Accels have the WORST record for failure.

Yea, you don't know what your talking about. You might want to use the search bar for a little education.

Good Luck with that.

That same coil finally bit the dust. i'd just order a whole set of them global e-bay coils and replace them all and I'd probably throw a new set of plugs in there while I was at it. Then it would be good for along time. I'd save the known good ones incase of another single failure..

Yea, that's what he should do, -less hassle that way. :thumbsup:

Get the coils from a known good supplier tho, I posted that one above.

k Thanks guys I just ordered a set from Global and will get them in asap....this time :lol:

I'm still confused about the A/F readings if I was not getting spark wouldint I run rich ?? not lean ??

Another question my A/F sensor is in the drivers side header just after the collector. I was seeing the A/F dip into the Sixteens while cruising home last night . do you think that points to the drivers side of the engine for the problem??

jbrew....you are saying that I need an education...YOU are the one telling someone that is running lean to hammer it when the problem starts...you must want him to blow up his truck.I am an ase master that does own a speed shop that has built well over 500 hipo cars/trucks.oh and my truck did this same thing and what i described helped me find my problem...bad cops.now you are right that these engins are very picky and no i dont have alot of exp with them but i dont care what engine,if you are running lean dont hammer it you are just asking for trouble.

01lightning super,please dont do what he suggest by hammering it when the problem starts,if you are leaning out you can and will hurt something in the motor. the cops,from ebay i dont know anything about so i cannot comment but they do have a good rep from what i have read.the accels on my truck are doing just fine,just remember that every part out there is going to have a bad one every now and then,thats why warranties are great.