Cronic_Moronic
LVC Member
My girl recently purchased a lincon LS v8 with 108k and supposedly bad coils. Turns the dealer that did the diagnostic on the car was a collection of morons and the issue is not with the coil packs.
When we got the car it was idleing very poorly, throwing multiple codes related to misfires, coils and a code for the EGR solenoid. It was also making a pronounced knock from the right head area.
All of the problems went away after 2k rpms.
Since getting the car I have replaced 3 coils (cylinders 1,3 and 4), the EGR solenoid, all 8 plugs and the right secondary timing chain tensioner. I also re timed the right exhaust cam. When I re timed the cam I didn't use the ford/jag tool - I lifted the cam out and manually turned it until the flat spot on the exhaust cam matched the angle of the intake cam of the same head. I did use an angle gauge to match them up, not just by eye. I used a 3rd generation metal tensioner from ford. Aside from the broken plastic on the tensioner everything else in the head looks good, no excessive wear or gunk.
With all that done the car idles much better with the knocking noise much less pronounced. All is good past 2k rpms still. The car now has a miss at 1500 rpms when hot. The CEL is still on and does flash indicating a missfire. Last time I had the codes read it was a P0301 and a P0304 with no other codes.
As for other things I have checked the fuel pressure is a steady 33 to 34 psi at idle and through short revs though I haven's tried taping the gauge to the windshield and going for a drive though I assume that since the miss fires seem located in #1 and #4 only the fuel supply to the injectors is fine. I also changed the fuel filter.
I haven't run a compression or leak down test as of yet but the car doesn't exhibit and signs of bent valves or a blown head gasket.
I changed the oil, 6 quarts came out and aside from being black as sin it looked fine.
At this point I'm not sure where look next and I don't have the time or money to go through and replace parts until I fine the one that is bad.
Any ideas on where I should look next or what tests I should run?
When we got the car it was idleing very poorly, throwing multiple codes related to misfires, coils and a code for the EGR solenoid. It was also making a pronounced knock from the right head area.
All of the problems went away after 2k rpms.
Since getting the car I have replaced 3 coils (cylinders 1,3 and 4), the EGR solenoid, all 8 plugs and the right secondary timing chain tensioner. I also re timed the right exhaust cam. When I re timed the cam I didn't use the ford/jag tool - I lifted the cam out and manually turned it until the flat spot on the exhaust cam matched the angle of the intake cam of the same head. I did use an angle gauge to match them up, not just by eye. I used a 3rd generation metal tensioner from ford. Aside from the broken plastic on the tensioner everything else in the head looks good, no excessive wear or gunk.
With all that done the car idles much better with the knocking noise much less pronounced. All is good past 2k rpms still. The car now has a miss at 1500 rpms when hot. The CEL is still on and does flash indicating a missfire. Last time I had the codes read it was a P0301 and a P0304 with no other codes.
As for other things I have checked the fuel pressure is a steady 33 to 34 psi at idle and through short revs though I haven's tried taping the gauge to the windshield and going for a drive though I assume that since the miss fires seem located in #1 and #4 only the fuel supply to the injectors is fine. I also changed the fuel filter.
I haven't run a compression or leak down test as of yet but the car doesn't exhibit and signs of bent valves or a blown head gasket.
I changed the oil, 6 quarts came out and aside from being black as sin it looked fine.
At this point I'm not sure where look next and I don't have the time or money to go through and replace parts until I fine the one that is bad.
Any ideas on where I should look next or what tests I should run?
