I have a 2004 Jeep Liberty and the engine is misfiring. If it was my old 2003 Ford F150, I'd know to change out a coil. Is there something similar in the engine of this model Jeep that I can change easily?
It uses COP units, coil on plug. Easy to change IF they are the issue.
When was the last time the plugs were changed? These do not use a high
mileage plug, they use a copper plug that needs to be changed every 35K
or they start misfiring, If you install any of the platinum or iridium
plugs they tend to mis-fire as well.
There is one copper core with platinum tip that works OK but they are
hard to find.
If you have multiple mis-fires you will want to check the fuel pump
output and make sure you are getting good flow.
On Tuesday, May 23, 2017 at 8:32:31 PM UTC-5, Steve W. wrote:
Code P0306 indicates that Cylinder 6 has too many misfires within a predetermined period of time.
PO306 Cylinder 1-10 Misfire Detected
Any thoughts would be greatly appreciated. I read where it could be a bad ASD relay too, but I couldn't find one on this car. I'm going to try the fuel injector cleaner. I may try replacing the fuel injectors at some point.
On Wednesday, May 24, 2017 at 8:47:25 AM UTC-5, Kevin Bottorff wrote:
Kevin, I don't have a compression gauge. I'm trying to do the easy and inexpensive things first before I take it to the shop.
Additional information. It runs well until I get it on the highway and get it warm. That's why it cuts out. And yes, as I walked away from the car yesterday, I did smell gasoline.
Thanks for all the help.
Check the running fuel pressure. That's a returnless system and the
pumps do get weak. I see where you hear a click from a possible rocker
arm. That could account for one cylinder but it wouldn't cause the
random miss or 3 and 4 misses.
I would start with a fuel pressure test, then do a top cylinder cleaning
as the 3.7 is prone to carbon build up.
It's very possible it's tossed a rocker arm. I would start with the easy
stuff first. Then pop the valve cover off and take a look if they don't
improve the issue. Broken valve spring or fallen rockers are easy to spot.
On Thursday, May 25, 2017 at 7:33:57 AM UTC-5, Steve W. wrote:
I took the valve covers off. As it turns out, it wasn't a fallen rocker arm. It was TWO fallen rocker arms on the passenger's side. The lifters are frozen solid, so I'll replace those and hope it runs for a while.
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