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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 03-15-2014, 03:35 PM   #21 (permalink)
grabowski
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Remove the Optical Sensor filter harness.

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Midland Diesel Las Vegas Diesel rebuilt 5221 Blue Label IP with ULSD Upgrade & rebuilt Bosch injectors @ 2200psi. 235-85 on 16" PYO alloys. Bilstein HDs, Hellwig rear sway bar. Heath TM. Fluidampr. S&B oiled filter Intake, Provent 200 W/catchcan. Bosch Duraterm GP W/PT Solutions GP harness. WJ FTB. AC Delco Tstat & Red Line Water Wetter. hxtasy PMD #2 resistor on Heath Isolator 4. LS 1/2" oil cooler & lines. OPS Relay Mod & Leroys Hose. Diamond Eye exhaust. Heath 2.5" crossover. W/T Grille. VDO EGT & Vac/Boost gauge with copper line & Leroys Boost Bolt.


- 12-13-16 Out Of Commission @ 194,680k, 50 miles after Teds Mil Takeout Install. Bad noises in the motor.
- 12-29-16 #7 lifters and pushrods replaced and still sounds like a metal trash can half full of hammers rolling down a scree field.
- 03-01-17 @ 194,802 miles she's no longer mine.

12-28-2016: I no longer recommend Badger/kr_services and Ted's Trucks
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Old 03-15-2014, 03:36 PM   #22 (permalink)
racer55
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Quote:
Originally Posted by amrush2112 View Post
Took a photo of code sticker in glove box. Looks like I have 3.73 gears. Anyone know how to break down this sheet?
use this with the vin #:
Comprehensive Chevrolet, Saturn, GMC, Hummer, Cadillac, Buick, Oldsmobile, Pontiac, Geo, Dodge, Plymouth, Jeep, Chrysler, Ford, Lincoln, Mercury, Mazda Truck, Mercedes VIN Decoder

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Old 03-15-2014, 03:37 PM   #23 (permalink)
amrush2112
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Quote:
Originally Posted by grabowski View Post
Remove the Optical Sensor filter harness.

Can you educate me on the what and why? Have no idea what that is.
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Old 03-15-2014, 03:46 PM   #24 (permalink)
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Quote:
Originally Posted by amrush2112 View Post
Can you educate me on the what and why? Have no idea what that is.
Take a look at this: https://www.dieselplace.com/forum/1428384-post31.html

Look at the top of the injection pump. There is a harness that connects to the Optic Sensor. It is the black cylinder on the top of the IP: https://www.dieselplace.com/forum/63-...ml#post5796970. The filter is connected about 6" down the harness. Unplug it from both ends and hook the harness back together.

The Optic Sensor Filter Harness is a known failure point and will contribute to the symptoms you hare having.
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Old 03-15-2014, 04:11 PM   #25 (permalink)
amrush2112
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Quote:
Originally Posted by Freddyack View Post
Take a look at this: https://www.dieselplace.com/forum/1428384-post31.html

Look at the top of the injection pump. There is a harness that connects to the Optic Sensor. It is the black cylinder on the top of the IP: https://www.dieselplace.com/forum/63-...ml#post5796970. The filter is connected about 6" down the harness. Unplug it from both ends and hook the harness back together.

The Optic Sensor Filter Harness is a known failure point and will contribute to the symptoms you hare having.

I looked for the sensor and was unable to find anything 6 inches down so I am guessing that may already have been completed. I did notice the smog pump is still on there. That is going to go soon.

I was also playing around with the not so well mounted remote PMD and cooler while the engine was running. As I touched the wire harness where it plugs into the PMD I was able to move the harness and the engine stumbled a few times then I actually could make it die. I moved it again and restarted the truck and it fired right off again. I think the culprit may be a bad or faulty connection in the cable and not the PMD itself. (Awesome!) So I think my best plan is to replace the remote location cable to a longer (6') cable and mount in front of oil cooler.

Also looks like the injection pump is new. Bonus! I also did the rev to 2000 for 10 seconds and let off throttle and it drops back and idles smoothly. Good sign. I repeated this test 5 times...same results.
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Old 03-15-2014, 04:22 PM   #26 (permalink)
grabowski
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Quote:
Originally Posted by amrush2112 View Post
. I did notice the smog pump is still on there. That is going to go soon.
Smog pump?
__________________
The highest recommendations are in Bold below
________
1985 GMC 6.2 manual 4x4 3/4+ton 64,013 miles (5-1-19)
______________
The Blowby Queen '94 Chevy 'burb Silverado K2500 4L80E 4.10. Quadstar Tuning.
Midland Diesel Las Vegas Diesel rebuilt 5221 Blue Label IP with ULSD Upgrade & rebuilt Bosch injectors @ 2200psi. 235-85 on 16" PYO alloys. Bilstein HDs, Hellwig rear sway bar. Heath TM. Fluidampr. S&B oiled filter Intake, Provent 200 W/catchcan. Bosch Duraterm GP W/PT Solutions GP harness. WJ FTB. AC Delco Tstat & Red Line Water Wetter. hxtasy PMD #2 resistor on Heath Isolator 4. LS 1/2" oil cooler & lines. OPS Relay Mod & Leroys Hose. Diamond Eye exhaust. Heath 2.5" crossover. W/T Grille. VDO EGT & Vac/Boost gauge with copper line & Leroys Boost Bolt.


- 12-13-16 Out Of Commission @ 194,680k, 50 miles after Teds Mil Takeout Install. Bad noises in the motor.
- 12-29-16 #7 lifters and pushrods replaced and still sounds like a metal trash can half full of hammers rolling down a scree field.
- 03-01-17 @ 194,802 miles she's no longer mine.

12-28-2016: I no longer recommend Badger/kr_services and Ted's Trucks
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Old 03-15-2014, 04:27 PM   #27 (permalink)
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Quote:
Originally Posted by amrush2112 View Post
I looked for the sensor and was unable to find anything 6 inches down so I am guessing that may already have been completed.


Quote:
Originally Posted by amrush2112 View Post
I did notice the smog pump is still on there. That is going to go soon.
Is the "smog pump" you are looking at mounted below the A/C compressor? If so, that is the vacuum pump. It controls the turbo waste gate. So dont remove it unless you are going to replace the turbo waste gate controls with: Heath Diesel or make one like this: https://www.dieselplace.com/forum/63-...-easy-pie.html

Quote:
Originally Posted by amrush2112 View Post
I was also playing around with the not so well mounted remote PMD and cooler while the engine was running. As I touched the wire harness where it plugs into the PMD I was able to move the harness and the engine stumbled a few times then I actually could make it die. I moved it again and restarted the truck and it fired right off again. I think the culprit may be a bad or faulty connection in the cable and not the PMD itself. (Awesome!) So I think my best plan is to replace the remote location cable to a longer (6') cable and mount in front of oil cooler.
Glad you found the problem . But dont mount the PMD in front of the oil cooler! You will block air flow. Most guys put it inside the bumper behind the license plate bracket.

Quote:
Originally Posted by amrush2112 View Post
Also looks like the injection pump is new. Bonus! I also did the rev to 2000 for 10 seconds and let off throttle and it drops back and idles smoothly. Good sign. I repeated this test 5 times...same results.
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Old 03-15-2014, 04:34 PM   #28 (permalink)
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Quote:
Originally Posted by Freddyack View Post




Is the "smog pump" you are looking at mounted below the A/C compressor? If so, that is the vacuum pump. It controls the turbo waste gate. So dont remove it unless you are going to replace the turbo waste gate controls with: Heath Diesel or make one like this: https://www.dieselplace.com/forum/63-...-easy-pie.html



Glad you found the problem . But dont mount the PMD in front of the oil cooler! You will block air flow. Most guys put it inside the bumper behind the license plate bracket.

Yes - Vacuum pump. Check on the not mounting in front of oil cooler. Makes sense. I am going to see if I can initially check the connections and find out the fault on the harness to the PMD. I believe that with the unit not being properly mounted that it is the cause of the disruption and weakened connection - aka - short. That will give me time to get a back up PMD and better harness while I fix the other gremlins to make it road worthy.
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Old 03-15-2014, 05:26 PM   #29 (permalink)
Freddyack
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Quote:
Originally Posted by amrush2112 View Post
Took a photo of code sticker in glove box. Looks like I have 3.73 gears. Anyone know how to break down this sheet?
From the FAQ's RPO Codes: https://www.dieselplace.com/forum/63-...rpo-codes.html

The VIN number link Racer55 posted is a great resource, too
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Old 03-15-2014, 06:37 PM   #30 (permalink)
amrush2112
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Quote:
Originally Posted by Freddyack View Post




Is the "smog pump" you are looking at mounted below the A/C compressor? If so, that is the vacuum pump. It controls the turbo waste gate. So dont remove it unless you are going to replace the turbo waste gate controls with: Heath Diesel or make one like this: https://www.dieselplace.com/forum/63-...-easy-pie.html



Glad you found the problem . But dont mount the PMD in front of the oil cooler! You will block air flow. Most guys put it inside the bumper behind the license plate bracket.

Quote:
Originally Posted by grabowski View Post
That is what I was looking for! Thanks!

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