Recent Content by Rockranch

Croll, Mine started much like yours sounds now. It's just that I don't drive mine a lot in the winter and I have been plugging along trying to find the problem, when I have time. It has just gotten worse.

Thank you. Mark, over at TST, suggested a possible small crack in the tip, that grows under increased pressure, causing the intermittent knock/smoke that goes away under cruise. That makes sense to me. When I have the time, I'll dig into it and figure out what is actually wrong and fix it. I...

Glad I could help!

I have asked the dealer, in the past, about a contribution test, and was told it's not available for the 2003. I expect what I'll do next is reconnect the TST so I can monitor rail pressure and look at connecting a fuel pressure gauge for the low side. I'll also pull the valve cover and ohm...

Thank you for the suggestions. At this point I'm just trying to diagnose the problem to effect a repair, without throwing parts at it in hopes of getting it right. If I wanted to do that, I'd just take it to the dealer. ;) The current injectors may, or may not, have 270,000 miles on them. If...

I've tried 2 stroke oil, and some other things, as a diagnostic remedy, but I'm not sure what MMO is. I think my brain just kick on. Marvel Mystery Oil?

Thanks for the follow up, Ed. To be honest, between the weather and this chest cold, I haven't been able to do more than think about it. I did have a conversation with Mark, over at TST. He was kind enough to give me a few ideas to try, along with the advice I have gotten here. I'll look into...

Thanks for the response, Bob4x4. I am aware of that, but it disappeared with the fender liner. I guess I was looking for a direction to look for what remains of that harness.

I have one, so I'll give it a try, though the problem seems to be under load and not at idle. I guess I could talk the wife into hanging on the fender and shooting temps as a drive down the road and get it to knock! Thanks.

It looks like the Scanguage II won't give me rail pressure, so I guess I'll be reconnecting my TST to monitor the rail pressure.

Replacing them all seems to be the consensus. I bought the truck used with about 195,000 on the clock and I'm now at about 270,000. I have no idea how many miles were on the injectors before I bought it. I'll poke around and see if I can check them through the harness, or if I need to pull the...

Where would I measure that? Can I do that at the plug on the head, by disconnecting the plug from the harness? If so, which two pins per injector? Thanks.

I'm thinking about that, but it is a lot of wiring to hook up, and it's raining. I might try my scangauge II. I think I can get rail pressure on it.

The tuner does monitor rail pressure, but the tuner has been completely removed from the system, to eliminate it as a cause of the problem.

Fuel filtration and pump is a Fass 95 titanium. I don't have a fuel pressure gauge on the low side and, without the TST hooked up, I don't have a rail pressure gauge. The bucking, knocking, smoke all happen together. The knocking and smoke seem like too much fuel at the wrong time. Like spark...