Hey guys,

I hope everyone had a Merry Christmas.

A few weeks ago, I got the SES flash and then steady. I read the codes, misfire 5 and misfire 8. So I replaced the wires. Sure enough, a few days later, misfire 5 and misfire 8. A few days after that, misfire 5 and misfire 8. I then replaced one the of coil packs, as 5 and 8 share a coil and they were always misfiring together. Not 10 miles after the new coil... Misfire 5 and misfire 8. Then, 30 miles later, misfire 6. What? 6? Then, a few days and a hundred miles later, misfire 5. Then 50 miles later, misfire 5.

The truck has 116k on it and the P/O did head gaskets about 5 years ago.

Thoughts?

Thanks!


~Max

 

Do a pressure test.

 

I'll do a pressure test this weekend. Anything particular I should be looking for, other than basic compression problems?

 

Check and see if your coolant level has gone down and also if your oil has turned milky brown. I noticed that you mentioned changing the wires and one of the coils but what about your spark plugs. If you haven't, take them out and examine them.

 

The truck uses VERY little coolant. After initial top on when purchasing, I've put 1/2" or so in the overflow over a couple thousand miles. Oil is milk free. Have not had the plugs out yet, they were replaced when I bought the truck 4,000 miles ago.

I'll pull the plugs tomorrow night and see if they have any signs of coolant. I'm also thinking of slamming a new plug in 5 just in case this is indeed ignition related and that coil in question somehow beat up that plug before I replaced it.

Anybody got a parts list I should start budgeting for if this is gaskets? (fingers crossed it's just a plug

~Max

 

Send me your number and I'll walk you thru exactly what to check.
By the way, no coolant lose is acceptiable.