High pressure relieve valve

[raychem]

your injectors sound bad, but if your fca was bad you WILL set a code, also you guys are forgetting----dirt in the system can easily wipe out everything in it's path. including relief valves and injectors or anything else that fuel runs in to.

I have personally had many instances especially with 24v's that have had faulty sensor (IAT, MAP,ect) that have never set off a code even when they were bad. Remember the comp looks many times for ranges and as long at it is within range... NO CODE.

 

[betterthanstock]

If you keep blowing relief valves, ask the dealer to replace the high pressure fuel sensor. If it sends too low a signal, it's like driving with a pressure box on all the time.

 

[Bob4x4]

your injectors sound bad, but if your fca was bad you WILL set a code, also you guys are forgetting----dirt in the system can easily wipe out everything in it's path. including relief valves and injectors or anything else that fuel runs in to.

I have replaced FCA's that had failed w/out setting codes... ... ... . not all failures set codes. The engineers that decide what to monitor did not cover all possibilities. They still do not have all the answers on the CRD or there would be no need of the lemon law.



Bob

 

[Gypsyman]

If you've been running with low rail pressure your injectors may be partially carboned over. I had injectors installed, ended up with a high side leak so the truck was barely making 12k at the rail. The 800 mile trip home was enough to completely carbon up the brand new tips. Fixed the high side leak, pulled, cleaned and reinstalled the injectors, all of the symptoms went away. Something to think about.



Richard

 

[CraigJones]

Where was yoyr high side leak ? I just replaced my injectors with F1's about 3 weeks ago and now it sounds like my truck is getting loud again. I really thinking that I have a leak that I can't find or my CP3 is going. Thanks

 

[Gypsyman]

Connector tube nuts weren't torqued correctly. Using the scanner we sent the CP-3 to max and all it could muster was 12k. Pulled the tubes, inspected them, re-installed and torqued to spec. Cured the problem.



Richard

 

[turbo lcc]

Not sure this will help but here is a link to what us D-max guys are doing about the fuel rail reg issue.



http://www.thedieselgarage.com/forums/showthread.php?t=8036

 

[EB]

Checked with dealer to see if they had checked the FCA. Said no, said it would have set a code. Giving up on dealer, having injectors put in tomorrow, will check the FCA at the same time. According to repair manual, remove FCA shake it, if it rattles, it is OK. If it doesn't replace it. Have one of those coming along with the injectors.

In the first post of this thread, I said I was having issues with injectors, heavy smoke on the least bit of acceleration, and a definite knock or tap all the time. This wasn't mentioned except to a few people in PM's. Myself and a few others have decided it is probably the injectors. I talked to someone at Piers Diesel about getting injectors and they said they need to change their Website on the injectors for 3rd gen trucks. They won't take cores because they are more likely than not cracked and no good. He also told me that the normal life expectancy for injectors was 200K miles. I have 299+K miles on my truck. I believe putting the injectors in will solve the problem. We will find out tomorrow.

 

[EB]

The injectors are in, I believe that solved the problem. The truck now starts like it should, doesn't knock like it was doing or smoke at the slightest bit of acceleration. I had the FCA checked, it was OK, and had the rail pressure checked and it was OK.

The old injectors were completely carboned up. (low fuel pressure??) I believe the knocking is what was taking the high pressure valve out, (back pressure from the injectors trying to fire?) I don't know, but it seems to be fixed now, time will tell. Hopefully I can get another 299,000 miles out of this set.