Guys-
Had multiple codes p1300/p0300/p0305/p0308. Changed out my coil packs and truck ran great. Started up this morning and all was well. After being parked, I restarted and felt the misfire and got an P0300 code. I'm thinking that it might be a crank position sensor. Would appreciate your thoughts on the CPS. Where is the CPS located and how difficult is it to change?

Thanks for your help.

 

CPS failures normally happen when the engine is hot, and result in complete shutdown rather than a misfire.

 

OK. That helps. Thank you!

 

And, a crankshaft position sensor failure does not trigger a code.

You said you changed the coil packs; what about plugs and wires?

 

Plugs (E3) were changed 22k miles ago. Kingsborne 8mm wires are 4 years (32k miles) old.

 

What plugs were installed?

 

E3 48 and my shop just looked at them 5k miles ago and said that they looked fine.

 

All of my terminal connections are clean and dry. Should I be using dielectric grease on the coil terminals and plugs? My research is conflicting. Some manufacturers (CRC) say to glob tons of the grease on contacts where others say never on the contacts and only around the spark plug boot. Thanks for your thoughts and help.

 

I asked what plugs were installed because conventional copper plugs don't last well in the DII. Double-platinum plugs are specified (Champion 7070s). If you'd like to understand why double-platinums are specified vs. copper just google "wasted-spark system", which is what is used in the DII.

Before I started taking care of my truck myself a dozen+ years ago a local mechanic installed copper plugs. They lasted only 13,000 miles before the misfires started. I installed double-platinum 7070s and they were still going strong 59,000 miles later when I replaced them proactively just because I found a set of STI wires at Rock Auto for just $11 and replaced them proactively too.

I didn't know anything about E3s so I went looking online. E3 doesn't specify what metals are used. I found this at the E3 site - "With decades of experience in spark plug engineering and the automotive aftermarket, the principals of E3 Spark Plugs realized that the key to producing a better spark plug did not lie in the use of fancy metals, such as iridium or platinum." (Emphasis in the original)

I know you said the mechanic "said that they look fine", but you might try swapping to 7070s or an equivalent.

As for the dielectric grease, it is an insulator, not a conductor of electricity. It should be used on the boots only. That said, the metal-to-metal connections are usually tight enough to scrape off the grease leaving a good connection. That may be why you find conflicting information. Before I understood all of this I used dielectric grease on the connectors when I replaced an O2 sensor. Holy Moly! All kinds of hell ensued and it took a lot of work to get the connectors cleaned out. If I tried it again on an O2 connector I'd use it very sparingly to try to help keep out water, but never on the metal-to-metal connections.

I hope this helps. Let us know how it goes. YMMV. Good luck.

 

I appreciate your thoughts on the plugs. I may have to bite the bullet and change plugs although I've never had an issue in several years of using the E3 plugs.

This evening when I drove the truck I got back my 1300/0300/0305/0308 codes. In looking at the freeze frame data it says "OL-Fault". Not sure what that means. Any ideas??


frame data is says "OL-Fault".