5 Trucks at Dealer Today - Same Problem

[Jumbo Jet]

I carried my truck into the dealer today for the occasional engine knocking problem.



Dealer had 4 other trucks in today with same problem. He checked TSBs and Star Tech and did not find any listed problems similar to mine.



Scenario: I crank the truck up, drive it 7 miles, turn engine off for 5-10 minutes, crank back up and under a load, either Drive or Reverse, and the engine knocks from 800-1000 RPM. The knock will quit after RPM exceeds 1000 RPM. Slow down, engine will knock again.



One truck today was a 6 speed, mine is an Auto.



I hope someone finds a solution. Knock is not only loud but also embarrasing to me for a NEW truck with 5,000 miles.



Service manager is investigating. Told me to drive the truck - didn't appear to be a serious problem. My next truck may not be a Dodge. The hammering knocking noise sucks!

 

[lmills]

Dang, that sucks. I wish you luck with getting it fixed

 

[Prairie Dog]

There have been some post's in the past regarding bad injectors causing knock. Seems like it was mostly the no. 1 cyl for some reason if I remember rite.

Good luck,

Scotty

 

[Tomeygun]

Originally posted by Prairie Dog

There have been some post's in the past regarding bad injectors causing knock. Seems like it was mostly the no. 1 cyl for some reason if I remember rite.

Good luck,

Scotty

two trucks at my dealership was a loose injector holddown



It was a very sickening knock... tell them to tighten all injectors...



My tech found it by shutting down each injector one at a time

 

[rbattelle]

This comes and goes on my truck. Frankly, I ignore it. I probably have a loose injector hold down (as others have reported).

 

[Fitasc]

My knock proved to be the # 1 cyl. injector. Road tested with dealer computer hooked up-- Shut off #1 and no clatter/"knock".

Shut off 2 through 6 and knock remained in the rpm range, mentioned by other posters, and we experienced a loss in power.

DC approved the replacement of the injector( this is a controled procedure and required the road test) and my truck has run perfectly since with a 2mpg increase. Empty @ 72 mph. yields 19. 2/19. 4 with cruise. Speed rolls about 2mph when I hit hill tpos. Also, I'm running 285 BFG'S and have recalibrated the speedo---

My 373 has become about 360. Pulling my toy box yields about 15. 8 to 16. 9 depending on speed between 70/78.

JAH

 

[Tomeygun]

exactly what rpm was this knock heard at?



I think my knocks at low speed like from a stop, and at idle, at idle the knock is a little less harsh... At what speed/rpm did they test and turn off an injector?



Thanks



Tom

 

[Jumbo Jet]

Anyone with pictures of the injector hold down that needs to be tightened according to preceding posts?



Do the valve covers need to be removed?

 

[BIGORANGEJEEP]

I personally would never ignore a knock. My 03 did infact have a bad #1 injector, and yes it sounded like $#!#. My main concern was that it might wash down a cylinder(sp). On a brand new truck I would not take a chance. Took two times before they figured it out. It took three days to get one flown in from Wisconsin so they gave me a loaner car to drive.

 

[Dean Upson]

I heard a bad knock on an '03 and it turned out to be the injecter pump. Truck had 7k on it and it sounded very bad.



Dean

 

[Steve M]

I've got 27k on mine and there is a slight knock but every diesel I've heard seems to have one cylinder more pronounced than the others. I haven't heard one with a loud knock yet. The cost of fuel system components in the new diesels causes me some concern with any diesel. If the new 3rd gen Cummins turns out to be a bank vacuum waiting to happen, my next truck might be an F250 V-10 or Dodge 2500 Hemi. But definately not a PSD or Duramax.

 

[loncray]

Yes, good luck getting that fixed. I've been really lucky so far - no engine problems outside of gelled fuel one morning when it got really cold.

 

[dnitzel]

My '03 knocked when it hit about 4 k miles and lasted until it got to about 10 k. Does not do it anymore at all, never had time to take it to the dealer. I figured if the engine blew, it still had the 100 k warranty. The idle does lope a bit though now and the turbo whistles real good when ambient outdoor is <35 DEGF.

 

[Jumbo Jet]

My service manager will not try to fix the loud knock in my engine because he can't find a reference to the problem in Star Tech.



Who can provide me a picture of the Injector Hold Down, and I will check the tightness myself?



Thanks