TheDieselPage.com Forums  
2017 - TDP's 21st Anniversary
What's New: | Feature Articles: | Product Reviews: | Member's Area: | Subscribe:
Duramax 6600 Diesel Page | Advertiser's Section | Classified Ads | Photo Album | Diesel Books, GM Licensed T-shirts


Go Back   TheDieselPage.com Forums > The Diesel Page Member Forums > 6.5L Turbo Diesel
Register FAQ Members List Photo Album Mark Forums Read

6.5L Turbo Diesel 1992-00 6.5TD - Discussion forum for the 6.5L engine.

Reply
 
Thread Tools Display Modes
  #21  
Old 05-19-2017, 10:49 AM
6.5_Diesel 6.5_Diesel is offline
Enthusiast
 
Join Date: Mar 2017
Location: ND
Posts: 20
Default

Quote:
Originally Posted by DmaxMaverick View Post
The vibration is normal. ECM boost control is not on/off, but is modulated and will allow wastegate opening at a gradual rate. 17" is a little high, but within the margin of error. 15" is ideal at sea level at any "full closed" RPM, with 11" the minimum. Less than ideal variations could be a matter of a well seasoned solenoid, or aftermarket programming adjustments. If you have an aftermarket power program, it wouldn't be unusual to have increased wastegate actuator vacuum, as a means to compensate for increased exhaust back pressure against the wastegate.

Ok, I will hook the trailer up tonight and take it for a spin after I get my boost bolt in so I can monitor boost again. I relocated my AIT back to stock as mentioned. As far as the boost solenoid goes, to my knowledge it is the original from new. I do not have a chip or anything to increase power. Just a PMD relocate, straight pipe exhaust and a not so cold air intake.
Reply With Quote
  #22  
Old 05-20-2017, 04:47 AM
6.5_Diesel 6.5_Diesel is offline
Enthusiast
 
Join Date: Mar 2017
Location: ND
Posts: 20
Default

Well, I installed my boost bolt last night and did a check with the new boost solenoid to see how it compared to the one on the truck. Both resulted in a vacuum reading at the actuator of about 19" Hg. So I left the stock one in place and took it for a drive with my 850 lb 4 wheeler in the box and a 3400 lb trailer on the back. It would still build boost as I was accelerating until it hit about 10 psi then would drop down to about 8 psi, which it appeared to hold. It appears to be working, but with the load I hooked up I did not get the engine temp up to about 200-210 like when I am pulling hard, so I will have to wait till next weekend when I take the camper on a trip to see if it actually works when under heavy towing.
Reply With Quote
  #23  
Old 05-30-2017, 08:38 PM
6.5_Diesel 6.5_Diesel is offline
Enthusiast
 
Join Date: Mar 2017
Location: ND
Posts: 20
Default

So I took the truck on a trip this weekend pulling the camper. I still get either a defueling symptom or an inability to control boost. It seems to happen when I drop below 60mph but as soon as I get to about 50mph it straightens out again (when in 5th gear). When it acts up I tried downshifting into 4th and that would not cure the problem it would continue to defuel/surge the boost.

I did have something else happen as well. I pulled the camper for 2.5 hours and then parked the truck for the weekend. When I went to start the truck after 3 days to hook the camper up, the truck would crank and crank but not start. It would not even try to start. No smoke out the tailpipe or anything. I was getting fuel to the fuel filter, but it seemed like nothing was going to the engine. I then went and unplugged my relocated PMD and plugged in the old one on the side of the pump, but nothing. Then I plugged in my relocated PMD and it started. Then about 10 miles down the road I had a huge miss in the motor, so I am putting money on my PMD is about to fail.

My last question is could a failing PMD cause my other symptoms of the defueling/boost surging? I would think that it is a definite possibility.
Reply With Quote
  #24  
Old 05-31-2017, 07:15 AM
Robyn's Avatar
Robyn Robyn is offline
Missy Good Wench ( Moderator)
 
Join Date: Apr 2001
Location: Newberg Oregon
Posts: 9,176
Default

The PMD is always on the hit list.

The PMD is the big weak link in the injection system on these engines.

What brand of PMD are you using ???
__________________
(1) 95 Suburban 2500 4x4
(1) 2017 Smart fortwo
Reply With Quote
  #25  
Old 05-31-2017, 06:22 PM
a5150nut's Avatar
a5150nut a5150nut is offline
Enthusiast
 
Join Date: Jan 2001
Location: Knoxville,Tennessee
Posts: 2,102
Default

And how good is your extension wire for your remote PMD?
Maybe clean connector pugs with electrical contact cleaner and spray a little di electric grease in them.
__________________
"The Constitution is not an instrument for the government to restrain the people, it is an instrument for the people to restrain the government."
-Patrick Henry


A5150nut
2006 K3500 D/A
94 6.5 4x4 5spd Sold
Reply With Quote
  #26  
Old 05-31-2017, 10:08 PM
6.5_Diesel 6.5_Diesel is offline
Enthusiast
 
Join Date: Mar 2017
Location: ND
Posts: 20
Default

Quote:
Originally Posted by Robyn View Post
The PMD is always on the hit list.

The PMD is the big weak link in the injection system on these engines.

What brand of PMD are you using ???
I have the relocate kit from Heath Diesel. I cannot remember what brand PMD it came with as it was like 6+ years ago I did the install. I have a new one on the way from Leroy Diesel along with the #9 resistor.
Reply With Quote
  #27  
Old 06-13-2017, 12:20 PM
6.5_Diesel 6.5_Diesel is offline
Enthusiast
 
Join Date: Mar 2017
Location: ND
Posts: 20
Default

Quote:
Originally Posted by 6.5_Diesel View Post
I have the relocate kit from Heath Diesel. I cannot remember what brand PMD it came with as it was like 6+ years ago I did the install. I have a new one on the way from Leroy Diesel along with the #9 resistor.
Well I took the truck on another trip with the camper and it happened again.....a no start. I found out the no start is from my harness going to the relocated PMD. To make it back home I go lucky that the pig tail off of the pump was just long enough to reach the PMD by setting it on the intake. The original PMD is a Dtech with a No. 7 resistor. I have ordered a new cable and will be mounting my new PMD with a No. 9 resistor onto the heatsink. I will be keeping the Dtech that was on the truck for a spare.

On the trip down camping, I still had the defueling/boost surge issue when I got between 60 and 55 mph (in 5th gear), so when I was at the camp ground I threw in the new boost solenoid I had to see if on the way home it would still do it. It still does the defueling/surging when I hit just the right speed ranges in both 4th and 5th gear. I have a new boost sensor that I am going to try, but after that I am out of ideas on what it could be.

Also, I noticed an oil leak coming down the passenger rear side of the bell housing. When I look up top, I can also see some oil in the valley under the intake. Any ideas on what could be leaking? Could it be the oil pressure sending unit?
Reply With Quote
  #28  
Old 06-13-2017, 06:44 PM
JohnC's Avatar
JohnC JohnC is offline
Enemy of the State
 
Join Date: Jan 2001
Location: New Hampshire - Live Free or Die
Posts: 4,948
Default

I seem to recall issues with surging when I was experimenting with a #9 resistor, about 18 years ago... IIRC, mine was calibrated for #4.
__________________
"Need" - Wanting to get someone else's money.
"Greed" (formerly meant what "need" means today) - wanting to keep your own.
"Compassion" - a politician's willingness to arrange the transfer.
-Joseph Sobran

Current oil burners: MB 350SDL, Kubota 7510
Gone but not forgotten: '87 F350 7.3, '91 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6
Reply With Quote
  #29  
Old 06-14-2017, 05:54 AM
6.5_Diesel 6.5_Diesel is offline
Enthusiast
 
Join Date: Mar 2017
Location: ND
Posts: 20
Default

Quote:
Originally Posted by JohnC View Post
I seem to recall issues with surging when I was experimenting with a #9 resistor, about 18 years ago... IIRC, mine was calibrated for #4.
I was wondering if the resistor change could mess up the air to fuel algorithms and how the ECM responds causing the issue. I have read that the computer can be very picky when it comes to maintaining proper air to fuel. What is the stock resistor for a 3/4 ton F VIN engine? Is it still a #4? I remember reading somewhere what it was but I cannot remember.
Reply With Quote
  #30  
Old 06-14-2017, 10:01 AM
JohnC's Avatar
JohnC JohnC is offline
Enemy of the State
 
Join Date: Jan 2001
Location: New Hampshire - Live Free or Die
Posts: 4,948
Default

The resistor is to calibrate the individual injection pump to the software. (Don't know how to better explain it). So, the resistor goes with a particular pump, not a vehicle. IIRC, 5 is the target setting, so if you're not sure what you should have, 5 is a good guess.
__________________
"Need" - Wanting to get someone else's money.
"Greed" (formerly meant what "need" means today) - wanting to keep your own.
"Compassion" - a politician's willingness to arrange the transfer.
-Joseph Sobran

Current oil burners: MB 350SDL, Kubota 7510
Gone but not forgotten: '87 F350 7.3, '91 C2500 6.5, '95 K2500 6.5, '06 K2500HD 6.6
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -7. The time now is 03:37 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1996-2017 by TheDieselPage.com - All Rights Reserved