Have a 2000, with 3.0L flex fuel. When i start it up, has a miss (very intermediate). When i give it gas, will go away. This morning, i was able to get DTC,s. Showwing miss in cylinder 5, and pending miss in 6. Any suggestions?

thanx
nate

 

have you ever replaced the factory ignition wires on your ranger

my B4000 is a 2010 model and the factory ignition wires were already shot

i replaced them with taylor spiral pro wires

 

Yes ^^^

Also check the spark plugs in #5 and #6, reset gap.

Cold engine needs to run Rich, that rich air/fuel mix will drown a weak spark.

 

Replaced wires/plugs. Still get miss on cylinder #6, on cold start up. Will go away if i let truck idle for a bit. Any more suggestions?

nate

 

2 things

1 / replace the coil pack , they do not last forever , sounds like 1 of the coils in the pack is failing

2 / run a full can of seafoam mixed with a entire tank full of 91 octane fuel through the engine

you probably have some significant carbon buildup in cylinders 5 and 6

when you use antiseize on spark plug threads , make sure you only use the COPPER antiseize and not the aluminum product

the copper antiseize aids in better electrical conduct between the spark plug and the aluminum cylinder head

 

Yes, there was a TSB on the 3.0ls in the early 2000's, bad batch of coil packs was the reason, thought is was '01-'02 but you could have got one in late 2000

 

Would that also make a "ticking" noise? Like pre-ignition noise?
Also, what brand would you reccoment? Can't fine motorcraft parts for it? Motorcraft number on part is F5SU-12029-AA

 

Davis(screamin' demon) and Accel coils have had good reviews.

That "ticking" could also be a bad spark plug wire or even the coil arcing.

Tonight or in a dark garage start engine and open the hood
Make sure it is good and dark, then watch spark plug wires and coil for arcing

Focus on #6 first as that's the misfiring cylinder, also #2 since that shares #6 coil

DO NOT reach for it, lol, you WILL get a bad shock, use a flashlight to see where it is then turn off the engine before checking the wire

 

replaced plugs, wires and coil pack. Still misses when first started (intermediate). Hot weather seems to make it worse

any more suggestions?

 

no codes, just pulled plugs. Cylinder 6 had brown slime on it. Wiped right off. Engine problems?

 

I guess you are down to mechanical issue.

I could be bad lifter, hydraulic lifters have a spring and a valve inside, either can fail, this can cause ticking at lower RPMs, lower fuel/air intake(intake valve) or not all exhaust gases are cleared(exhaust valve), because valve isn't opening all the way, so you get misfire or partial misfire.
When RPMs increase the oil pressure goes up and lifter is fully expanded.
Warmer weather makes for thinner oil to start out with.
You could try a compression test, or pull valve cover on that side and test push down pressure on those lifters compared to the others on that side.
Also turn engine over manually to check "lift" on each push rod/rocker

Ticking could also be a fuel injector, although more of a long shot with description, i.e. it most likely wouldn't get better at higher RPMs it would get worse

 

That sounds about right, ticking seems to be from cylinder 6. I did just put 10w40 in it (from 10w30), noise is less. Over 100k on it, drive it until time for Jasper motor.

Thanx for all the help guys