I've had this strange knocking sound going on for the past few months and I'm not sure what it is. It does it while idling, while driving at a steady speed, while accelerating, but NOT while coasting. It doesn't sound like piston slap or bad bearings, at least not to me. 

 

Here's a video of the sound I'm talking about:

 

 

As you can hear my idle is still set too high 

Edited June 23, 20168 yr by The_Hammer

The_Hammer

On the 12V's it's generally recommended to use the thinnest washers that way it's shooting as far in the bowl as possible with the higher than stock timing people typically run.  As far as what's stock, I've seen each size in a stock application.

 

notlimah

Thanks, I'm glad you found it useful.

 

 

@Cowboy So... Where is that wonderful write up here?

My truck is running worse now. The injector knock is louder, there is a noticeable miss while idling, and I've lost some power. It's funny how fast it's gone downhill since starting this thread 

Time to get it fixed before you do damage something...

56 minutes ago, Mopar1973Man said:

Time to get it fixed before you do damage something...

 

I should have the new injectors this weekend. 

 

Oh, and 

 

Edited June 29, 20168 yr by The_Hammer

Ohhh Archer! Haha

I just remembered what the shop that popped my injectors a couple years ago told me. He said the P7100 wears out before the injectors do and that it was probably time for a rebuild 

Injectors typically last at least 300k.  Though the stock ones I've seen between 200-300k are typically down to 220-240 bar.  All they needed was a little shimming and were good to go again.

 

The P7100 is debatably the most reliable part on the truck, though some 94-95's have plunger warping issues.

 

22 hours ago, Mopar1973Man said:

@Cowboy So... Where is that wonderful write up here?

 

Complications.

Edited June 29, 20168 yr by Cowboy

Well I'm still waiting on my injectors 

 

Guy was supposed to ship them Wednesday but didn't, didn't Thursday because he said he and his wife ended up with food poisoning but promised to ship them yesterday. I sent him a text a couple hours ago asking if he shipped them yet and haven't heard back. I'm starting to get pissed already. If he didn't ship them yesterday I'm telling him to refund my money or I'm filing a claim with PayPal.

 

 

ETA: Finally heard back from the guy, said he shipped them yesterday and I should have them middle of next week. 

Got the injectors in this morning. No more injector knock or popping while under a load and a TON more power! It pulls hard until around 2200-2300 rpm then starts defueling. I can only imagine what a 4k gsk and bigger turbo will do 

Glad you got things straightened out!

Good to hear you got it figured out.  Which injectors did you go with?

3 hours ago, Hawkez said:

Good to hear you got it figured out.  Which injectors did you go with?

 

Contaigious Diesel 5x.012 VCO. I bought them lightly used (around 5k miles) from a member on Cummins forum. 

Good to hear you found your problem. Hope you are drying up alright out there. 

2 hours ago, dripley said:

Good to hear you found your problem. Hope you are drying up alright out there. 

 

We're all dried up and the river is back to normal. Almost done repairing the house, should be back in it within two weeks. 

I've now got some questions about turbos. I'm going to upgrade my HX35 eventually and I'm not sure which direction to go. I'm not going any larger than the 5x.012's I have now and just want to maximize their potential. I was thinking about going with a 62/65/12 but I'm not sure yet. Thoughts? 

Be careful. As you increase turbos the lag will always come with it.

True enough, but the drive-train likes lag so it's kind of a wash depending on how you look at it.

 

I obviously do not look at it that way!

 

Also being an automatic, you won't notice the lag as much as us stick guys.  A HE351 or S362SXE should do fine.

As long as the turbo lag doesn't create poor street manners and excessive smoke output. Then lag on...