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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 07-30-2019, 07:34 PM   #31 (permalink)
JWJ2017
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OT: I'm curious what is going on w my instrument cluster. Do they just get tired? I've checked and cleaned the ground points...but my voltmeter also reads low...wondering if i need to replace it or just deal w it...

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1997 K2500 Suburban, 6.5L VIN F
4L80E, 208K miles, pretty much stock
(prev owner did a lot, I removed aftermarket intercooler, reinstalled vacuum pump w/wastegate control etc after I bought it)
relocated PMD w/resistor, mounted behind grille
Webasto diesel-fired coolant pre-heater
EGT, boost and trans temp gauges
3.73 gears (was 4.10)
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Old 07-30-2019, 07:41 PM   #32 (permalink)
OkDually
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Quote:
Originally Posted by JWJ2017 View Post
OT: I'm curious what is going on w my instrument cluster. Do they just get tired? I've checked and cleaned the ground points...but my voltmeter also reads low...wondering if i need to replace it or just deal w it...
Is the entire cluster acting up or just a gauge?
There are some links to gauge fixes in the FAQ

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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
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Old 07-30-2019, 11:31 PM   #33 (permalink)
JWJ2017
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Quote:
Originally Posted by OkDually View Post
Is the entire cluster acting up or just a gauge?
There are some links to gauge fixes in the FAQ

before this I thought it was just voltmeter. but now I'm wondering about the cluster. tank level seems fine. ol pressure seems a little low, but havent measured it independently


thx for the tip
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1997 K2500 Suburban, 6.5L VIN F
4L80E, 208K miles, pretty much stock
(prev owner did a lot, I removed aftermarket intercooler, reinstalled vacuum pump w/wastegate control etc after I bought it)
relocated PMD w/resistor, mounted behind grille
Webasto diesel-fired coolant pre-heater
EGT, boost and trans temp gauges
3.73 gears (was 4.10)
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Old 07-31-2019, 01:21 AM   #34 (permalink)
jnlperformance
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Originally Posted by DieselGuy93 View Post
Long bed crew cab here, get 15mpg combined.

I do a lot of idling and warm up time. I don't like to turn the truck on/off a bunch of times, so that probably eats into my fuel budget a tiny bit.
So do I. It's not good to just crank and go without a warmup... and the fuel costs of idiling are very negligible.

Driving otr, that truck never ever turned off.

When mine is on, it stays on for quite some time. Especially in the winter.
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Last edited by jnlperformance; 07-31-2019 at 01:26 AM.
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Old 07-31-2019, 06:05 PM   #35 (permalink)
JWJ2017
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Hey my apologies everyone, I didn't see the FAQ ***The Official MPG Thread*** which is pretty good!


I do appreciate all the patient answers though, esp considering it's been covered before!
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1997 K2500 Suburban, 6.5L VIN F
4L80E, 208K miles, pretty much stock
(prev owner did a lot, I removed aftermarket intercooler, reinstalled vacuum pump w/wastegate control etc after I bought it)
relocated PMD w/resistor, mounted behind grille
Webasto diesel-fired coolant pre-heater
EGT, boost and trans temp gauges
3.73 gears (was 4.10)
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Old 08-01-2019, 12:56 PM   #36 (permalink)
jnlperformance
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Theres a bazillion posts on pmd relocation, bad this and that... an endless rabbit hole of the same ole song and dance. No need for apologies.

Besides... what fun would that be if we all stuck to the same old boring post with 500 friggin pages... exempting a few... like the "what have you done to your (variable) today?" Or ? I think maybe one or two more....the funny CL ads and rides we all want...
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Last edited by jnlperformance; 08-01-2019 at 01:00 PM.
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Old 11-08-2019, 02:04 PM   #37 (permalink)
JWJ2017
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UPDATES:

new injectors didn't really bump it up much. with 1.13X conversion on odo readings, and the handful of upgrades, I'm now at 15MPG city/17MPG hwy.


I guess for a K2500, that's prob the best I can hope for?


I put in Pensacola Diesel new injectors, so maybe I could have gone Bosch or better and gotten better performance?
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1997 K2500 Suburban, 6.5L VIN F
4L80E, 208K miles, pretty much stock
(prev owner did a lot, I removed aftermarket intercooler, reinstalled vacuum pump w/wastegate control etc after I bought it)
relocated PMD w/resistor, mounted behind grille
Webasto diesel-fired coolant pre-heater
EGT, boost and trans temp gauges
3.73 gears (was 4.10)
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Old 11-08-2019, 06:08 PM   #38 (permalink)
Tommygunner
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Just sayin about long idle times.... Unlike OTR trucks. These engines are not designed for sitting long periods at idle. At idle, especially in cold weather. The combustion chamber temps go down. Fuel does not ignite or burn fully. Unburned fuel washes down the cylinder wall, causing wear, dilutes the oil, and fouls the injectors with carbon. Idling long time will also plug up a catalytic convertor if so equipped. They do not like raw fuel.
A warm up of 3-5 minutes is really all they need.
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1998 GMC K1500 WT, 6.5 TD. 80,000 miles. Auto, 3.73 gears. Remote PMD mounted on the radiator support. KOJO tune WOW! Carter HD lift pump. Feed the beast, GM8 turbo with Hurricane impeller. K&N filter. Ported, gasket matched upper intake. Leroy's braded stainless steel oil lines.
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Last edited by Tommygunner; 11-08-2019 at 06:10 PM.
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Old 11-08-2019, 08:27 PM   #39 (permalink)
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Quote:
Originally Posted by JWJ2017 View Post
UPDATES:


I put in Pensacola Diesel new injectors, so maybe I could have gone Bosch or better and gotten better performance?
The injectors you bought are made in China, New Delphi or new Bosch would have been the ones to get.
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Old 11-08-2019, 09:21 PM   #40 (permalink)
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Quote:
Originally Posted by DieselPro View Post
The injectors you bought are made in China, New Delphi or new Bosch would have been the ones to get.
What's your opinion on Acdelco injectors? Everybody says ACDELCO this and ACDELCO that.............so i put 8 new 217-1404 Acdelco injectors in this summer. Are they actually Bosch or some other brand, hopefully not CKO?

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'95 GMC Sierra 6.5TD C2500 2x4, reg cab, long box, 4L80E, 3.73 rear, VIN F, L65, 120K. Mods: DE 4" exhaust/crossover, WW2, PMD relocate, Dmax fan/clutch, HP air filter, Fluidampr, B&M Trans/Diff covers.
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