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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 06-09-2019, 01:45 PM   #1 (permalink)
Tr00b
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Got the boost farts

Replaced the boost solenoid a long time ago when I actually accidentally had a MAP sensor unplugged. Occasionally when hot I'll have no boost or it will have the boost farts, where it will be zero until about 2000 rpm and suddenly the boost kicks in, leaving a giant trail of black smoke.

Unfortunately this only seems to be when driving. Both the vacuum pump and the wastegate actuator are original but function fine until when hot and only sometimes malfunction when hot.

The remedy for this is a blast of WD-40 into the solenoid and a long blast into the vac system. Haven't done this since last summer and this solution is very temporary, couple weeks to a month in the summer and frankly irritating. Because it usually happens when smoke is not desired, like in Friday traffic jam, or when I want to beat on the truck or when towing.

The truck is tuned hot so it sees peak 11-15 lbs of boost at times , and it's possible that boost vs intake temperature kicks the truck into derate possibly? Yesterday I got an SES light which I'm attempting to read today. Bluetooth OBD scammer number 9 must be dead

Possible fail points could be the MAP sensor, vac pump, wg solenoid that just sucks, or wg actuator.

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1996 GMC K1500xcab 6.5 3.73 4L80E rear bags Bought at 99k 12/13 now 138k 9/17
Repairs:
BWD OPS 1/14 Heath PMD kit 3/14 Airtex boost solenoid 6/14 Lube Specialist cooler lines and cooler, rad support mounts, Pro Comp ES9000 Shocks, rear brakes 7/14 Interstate Batts, Cooper AT3 tires, Hummer H3 rims, stepper motor 4x4, coolant flush 11/14 Stabilizer bar links, soot trap gasket 9/15 Dorman tank, sending unit/sock delete, filler neck, filler neck, hose, Leroy's Tank Barbs, SAE30R9 lines, WIX filter head and prefilter with brackets by paleyjim, intake manifold gaskets 3/16 Used transmission, dipstick tube, fluid flush, drain plug pan by paleyjim, power steering fluid flush, transfer case seals and fluid 9/16 Duraterms 11/16 Ball Joints and wheel bearing drivers side. Powerstop pads, lubed sliders 4/17 AD244, Leroy's Flight Systems PMD 9/17
Performance:
Ashland Muffler 2.5 X-over 12/13 FTB FFM by paleyjim, ported upper egr delete S-code, lower F-code, ported IP fitting, FASS DRP-02 lift pump 3/16 Transgo Shift Kit by paleyjim, Energy Susp. engine+trans mounts 9/16 Ported GM8, Diamond Eye, Quadstar tune 11/16 K47 Box, Glowshift 3-1 1/17 Leroy's Billet Crank pulley, Fluidampr. 9/17
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Old 06-16-2019, 10:56 AM   #2 (permalink)
structures
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My truck is pretty much stock with exception of a turbomaster. I always was driving blind in my 97 without gauges and was surprised when I mounted the pillar gauges to find out I had zero boost most of the time. Truck was a dog just passing people on the highway empty. Then I was really surprised towing maybe around 10k in OD I was barely getting 5 psi, then when dropping in 3rd gear boost went to zero. I then did the "turbo master" mod and got rid of the vacuum set up. Like a whole different truck. Always peppy on the highway empty running a couple pounds. Down shifting when trailering gives more boost always. It's set to maybe 12-14 psi max. Never seen it go above 15 anyway. Once or twice I've gotten a boost code can't remember what it is. But never had any derate.

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1997 Chevy K2500 Ext cab long bed Vin F 6.5l TD 4:10 4l80e
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Old 06-21-2019, 02:58 PM   #3 (permalink)
LinePilot
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Quote:
Originally Posted by structures View Post
My truck is pretty much stock with exception of a turbomaster. I always was driving blind in my 97 without gauges and was surprised when I mounted the pillar gauges to find out I had zero boost most of the time. Truck was a dog just passing people on the highway empty. Then I was really surprised towing maybe around 10k in OD I was barely getting 5 psi, then when dropping in 3rd gear boost went to zero. I then did the "turbo master" mod and got rid of the vacuum set up. Like a whole different truck. Always peppy on the highway empty running a couple pounds. Down shifting when trailering gives more boost always. It's set to maybe 12-14 psi max. Never seen it go above 15 anyway. Once or twice I've gotten a boost code can't remember what it is. But never had any derate.
Robert, did u turn up your pump or add a chip with your TurboMaster? Have been considering deleting my vac system and go mechanical.
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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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Old 06-22-2019, 06:46 AM   #4 (permalink)
structures
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No. No tunes. I ran a no 9 resistor at one point.
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1997 Chevy K2500 Ext cab long bed Vin F 6.5l TD 4:10 4l80e
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Old 06-22-2019, 09:12 AM   #5 (permalink)
crankme69
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I would check the wire connections at the solenoid plugs while the motor is running for poor connections...

Mine is OBD1 and I believe the turbo & vacuum setup rod may be slightly different but I added an external helper spring to mine that keeps mine boosted so if that vac system chits the bed mine will never go to zero. I just added a spring that would be used for an old wooden screen door works like a charm, so I have both.
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1995 1500 Silverado 6.5TD 2WD Ext Cab 246K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 217K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 208K Buddy chip F intake, daily work commuter 21mpg avg

2005 FLHTC 107 Twin Cam Tman 625 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

1995 FXD 80 EVO V Thunder 2015 cam, Mikuni 42, SE slip ons, 80Tq & 70Hp
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Old 06-22-2019, 11:16 AM   #6 (permalink)
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Quote:
Originally Posted by structures View Post
No. No tunes. I ran a no 9 resistor at one point.
Appreciate it , thanks.
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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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Old 07-06-2019, 09:12 AM   #7 (permalink)
Tr00b
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I can swat the top of the solenoid with my hand and the boost will come on, yet if I pull the line off the actuator, I lose all vacuum to the actuator. Have to hook it back up and swat the solenoid for it to come back on.

Sprayed it with wd40 on Tues and it was acting up by Friday. It was acting up in the driveway so I was able to mess with it. It's working now but function is pretty sketchy don't trust it.

After many years of hanging on to the stock system for fuel efficiency, im starting to have enough going wrong with the truck that I won't be able to to replace the vac pump when it goes. Going to see if I can find my old boost solenoid, I kept it ....

Crankme do you have a picture of your semi spring gate?
__________________
1996 GMC K1500xcab 6.5 3.73 4L80E rear bags Bought at 99k 12/13 now 138k 9/17
Repairs:
BWD OPS 1/14 Heath PMD kit 3/14 Airtex boost solenoid 6/14 Lube Specialist cooler lines and cooler, rad support mounts, Pro Comp ES9000 Shocks, rear brakes 7/14 Interstate Batts, Cooper AT3 tires, Hummer H3 rims, stepper motor 4x4, coolant flush 11/14 Stabilizer bar links, soot trap gasket 9/15 Dorman tank, sending unit/sock delete, filler neck, filler neck, hose, Leroy's Tank Barbs, SAE30R9 lines, WIX filter head and prefilter with brackets by paleyjim, intake manifold gaskets 3/16 Used transmission, dipstick tube, fluid flush, drain plug pan by paleyjim, power steering fluid flush, transfer case seals and fluid 9/16 Duraterms 11/16 Ball Joints and wheel bearing drivers side. Powerstop pads, lubed sliders 4/17 AD244, Leroy's Flight Systems PMD 9/17
Performance:
Ashland Muffler 2.5 X-over 12/13 FTB FFM by paleyjim, ported upper egr delete S-code, lower F-code, ported IP fitting, FASS DRP-02 lift pump 3/16 Transgo Shift Kit by paleyjim, Energy Susp. engine+trans mounts 9/16 Ported GM8, Diamond Eye, Quadstar tune 11/16 K47 Box, Glowshift 3-1 1/17 Leroy's Billet Crank pulley, Fluidampr. 9/17

Last edited by Tr00b; 07-06-2019 at 09:13 AM.
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Old 07-06-2019, 12:28 PM   #8 (permalink)
JMJNet
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Looks like the boost solenoid may be bad?
Did you check all the vacuum lines?

I did what @structures did 12 years ago with a TM from Heath (NOT homemade) and never look back.
I know most member here will flame you when we suggest the mechanical wastegate aka TM.
The cost and time to maintain and troubleshoot the vacuum system is just not worth the time. Plus the system is aging 24 years old to be exact in my truck. It is well above the life expectancy that GM ever put in this truck. IMO.
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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
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4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator
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Old 07-06-2019, 01:26 PM   #9 (permalink)
jnlperformance
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... I still use the vacuum actuated wastegate.... there is a bit of a saftey factor to it as well as efficiency.

Not to say I dont plan on going to a mechanically actuated wastegate (relatively soon)

...to each is their own... and dont fix it if it's not broken....

And troob, if you need a boost solenoid PM me I think I have a spare or two if your spare dosent turn up or does not work (also... can we not get these on RA??)
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Last edited by jnlperformance; 07-06-2019 at 01:29 PM.
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Old 07-06-2019, 08:48 PM   #10 (permalink)
crankme69
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Quote:
Originally Posted by Tr00b View Post
Crankme do you have a picture of your semi spring gate?
https://www.dieselplace.com/forum/63...ml#post4643184

Running both won't hurt anything, might loose a little MPG with both but it sure is easy to install and remove.

__________________
1995 1500 Silverado 6.5TD 2WD Ext Cab 246K, FSD cooler bumper mount, Buddy 3 pos chip, DE 4" exhaust, K47 with F intake

1995 Tahoe 6.5TD 217K Buddy chipped cat & muff delete

1994 1500 Silverado 6.5TD 2WD RCLB 208K Buddy chip F intake, daily work commuter 21mpg avg

2005 FLHTC 107 Twin Cam Tman 625 cams, 10.1 CR, Mik 45, DTT map, 3.37 final, E1 clutch & VPC with SE 6 sp, SnS roller rockers Bub 7 2 into 1 exhaust, 120Tq & 120Hp

1995 FXD 80 EVO V Thunder 2015 cam, Mikuni 42, SE slip ons, 80Tq & 70Hp

Last edited by crankme69; 07-06-2019 at 08:53 PM.
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