Starting with FUEL PRESSURE

[94f450sd]

what color is the fuel in the filter?
the P1293 is a bad connection in the wireing to the valve cover gasket on the passengers side.pull both valve covers and check all the wireing connections on the gaskets and harnesses.most likely have a burnt pin.repair the wireing problem first

 

[CSIPSD]

Replace BOTH of your UVCG, and the wire harness. Then test again. With the one on 8 failing and again on three, dont waste time replacing one, do them both.

The IAH delete is not causing this, delete it and forget it.

Your Boost is low, check and or replace all your CAC connections, check every location for leaks.

Sounds like a wastegate is loose if your jumping from 12 to 17 by unhooking it.

Also look at getting the ITP boost regulator.

 

[jeffnzoya]

OK, let me bring all of you up to speed. The only mods I have on this truck is a Pinnical Performance 4 inch from turbo back exhaust. Pyrom & Boost Guage. An 80hp sc (the one that plug's into the computer to the left of your feet), and the AIH delete. I have a K&N filter also but no aftermarket intake. Comeing soon.

My problems with this engine as compaired to my original engine are as follows.

1. Not as much power.
2. 12 mpg vs 16.
3. Not near as smooth.
4. Very loud chatter to engine. Can't hear my exhaust
5. And to me, a noticable miss.

What I've done to this point.

Original scan showed #8 cyl. bal. fault. And the tech. acted like the HPOP pressure was way low but later said is was ok.

Changed #8 injector with one from my old engine and put new O ring's on it (purchased the O ring's while at the shop, 40 miles from my house). Over the next week I noticed improvement but still felt miss.

Had scanned again at the same place. Showed #8 and #3 cyl. bal. fault. I thought no way and got a second opinion. The second opinion showed #3.

Changed #3 injector with one from my old engine but did not use new O ring's. For the first few miles, it felt smooth but after a good runnin it felt like the miss was still there.

Drove for a few weeks and took back for a scann. #3 bal. fault and high side open bank #1 Right.

Today, I again pulled the #3 injector and replaced (with one out of my other engine). After completion, I started the truck and it really seemed to be running smoother and I am not sure it is not a little bit better. However, after my test drive, and I pulled it back into the garage, I felt what I think is a low rpm miss. And now a new twist, when I rev the engine to about 2k rpm and hold for a few seconds and let rpm's drop, it want's to die, and then regains composure but still misses.

OK, Please don't laugh. I have the valve cover gasket's from my old engine. They were only a few month's old when she let go. Would it be worth my while to change them or is that a job for a real tech.

Thank's for your imput.

Jeff.

 

[jeffnzoya]

Joe, I am glad you mentioned checking for leaks. I went out and took a flashlight and looked around the turbo for leaks and noticed a lot of black soot around the pipe behind the turbo. Could this be my boost problem. If so, how much of a b---- is it to fix.

Jeff

 

[CSIPSD]

Joe, I am glad you mentioned checking for leaks. I went out and took a flashlight and looked around the turbo for leaks and noticed a lot of black soot around the pipe behind the turbo. Could this be my boost problem. If so, how much of a b---- is it to fix.

Jeff

Up pipes are very common issues. You can replace them and then do it again in a year or so, or look at a bellowed system like here.

Diesel


Basicly everything you would replace, but coated and with bellowed up pipes, which delete the compression dougnuts that come from the factory. This should fix some of your boost issue.

As far as the running rough, Get 8 new injector O ring kits, REPLACE them all, TQ to proper spec, replace the glow plugs, replace the UVC wire harness and gaskets on both sides. Until you do this, you are just chaseing your tail. Might want to pick up a ICP sensor and read up on cleaning the IPR as well.

 

[jeffnzoya]

Joe; After driving my truck for awhile today, it really feels much smoother and a slight increase in power. My plan is to change both VCG's and I'll also replace all the O rings.

Also, I purchased an air filter from NAPA, removed my factory air box and used my stock tubing to attached the filter.

I went down to a place where there is about a 1/2 mile straight which is up an incline and from a dead stop WOT to 70mph with OD override pushed in I boosted 17. This was with the red hose unplugged.

Same run with the red hose plugged in and it boosted 15.

I have read several post's stateing the PSD should boost 16 stock. Do you think the up tube leak could be robbing me of that much boost. I would think with a 80 hp chip, it should boost more than that.

Jeff.

 

[dpantazis]

jeff-

good move getting rid of that K&N filter.

you have a boost leak. i would bet money on it. rig up a doo-hickey like i showed you and you WILL find it. trust me. you could have a bad clamp or torn boot.

dennis

 

[jeffnzoya]

Dennis, I am not sure what kind of doo-hickey you are talking about but I am all ears.

Also, I have checked all my clamp's and boot's and all seem to be ok.

Got to go to work. Be back on line about 10.

Jeff

 

[JLDickmon]

after reading this thread, here's what I would do..
1. pull all the boots, clean them in some soapy water and reinstall them
2. if you have a new set of v/c gaskets, swap them out.
2a. double check the connectors for burnt spots, loose terminals or green groties
3. pull the chip and throw it on the bench for right now
3a. check for loose pins, green stuff, etc., here too.
4. change the oil - use a CF/CG/CH rated oil, like Shell Rotella, Mobil Delvac, Kendall Super D

hissing noise.. that intrigues me
I'm thinking the exhaust packpressure valve might be stuck shut? partially closed? EBPV sensor or tube clogged?
not sure that would cause low boost pressure, but it sure would make it a gutless wonder

anyhow..
Dennis & the others are giving you good advise; listen to them, you shall

 

[jeffnzoya]

where is the EBPV located or how can I have it checked.

Jeff