What to do? 2000 Explorer valve job.

[ricky123]

I have a 2000 Explorer w/ 4.0 SOHC 4 x 4 w/ 90k mi. Check engine light was on and it would not pass smog check. I took it to a mechanic to check light. This is his report: Performed diagnosis on malfunction light on found COE PO306 misfire #6 cylinder. Checked cyl cotribution found #2 & #3 cyl also show misfire but intermittent. swap #6 plug and wire to #5 misfire did not follow. replaced coil with test coil no change. need to run compression test and fuel test.

Performed fuel pressure test KOEO 65 psi OK. Performed cranking compression test all cyl within 155-160 psi. performed running compression test #6 cyl @ 55 psi #5 cyl @ 90 psi. Suspect bad valves, recommend remove cylinder heads and inspect. Note: Requires R & R engine.

At this point I took the vehicle home as they wanted $3200 to repair. Has anyone had this problem? How much should a valve job cost. Should I have Timeing Chain worked on at the same time.

 

[Sedition]

A hell of a lot cheaper if you are able to work on it yourself.

 

[Turdle]

welcome to the forum

yep, timing chains will be removed to pull the heads.

I moved this thread to the stock 1995-2001 sub forum, and deleted the duplicate thread.

 

[2000StreetRod]

dynamic compression test

The numbers for a dynamic compression test are typically half or less those for a static compression test. Cylinder #5 may be OK but cylinder #6 definitely has a problem. It is probably valve train related but it might be a sticking valve. I suggest trying an engine flush - especially if you haven't been changing your oil and filter on time. I use Gunk's engine flush. You add it to a cool engine, idle the engine for five minutes, drain the engine, replace the filter and add new oil. I always prefill my filter with oil to reduce the time the engine runs without oil pressure.

Cylinder #6 is on the driver side. The engine does not have to be pulled to remove the head.