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Old 12-03-2010, 02:12 AM   #1 (permalink)
SS Duramax
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So whats the latest glow plug rave?

I've searched and didn't really find any conclusive results.

I've got a 99 Hummer with a 6.5 diesel and I'm experiencing some hard starts, even with 30+ temps. She's got 44,000 miles and I run optilube winter additive and don't have any codes so I'm thinking its the glow plugs. I don't have access to a block heater plug in at work, but at home I plug her in. I don't know what glow plug's are in it now, but I want to make sure she'll start right up on the coldest winter nights. I'd rather just replace them so I know whats in there and don't have to worry about swelling or broken tips. All the hummer guys say AC 60g's, but you 6.5 guys say they take too long to heat up. What about Kennedy's "Quick heat glow plugs", any good? I've also read about WAP plugs, any good?

I can get a programmed computer to extend the glow plug on time, but probably won't do anything like that until next summer. I don't know about wiring in an extended glow plug switch either, I'd rather just cycle the plugs a few times.

So what would be the best glow plugs for my hummer and where can I get them?

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2006 LBZ LT3 3500 CC. Banks Ram air intake and Super Scoop, 3" SS Heat wrapped and ceramic coated downpipe, MBRP 5" SS downpipe back exhaust.

1999 Hummer H16.5L TD, Ron Davis Aluminum radiator, HD water pump, Airraid air filter, 37" tires and locker stock

1996 Z28 SS clone.GMMG,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strano 1 lowering springs & swaybars,Spohn Road Race K-member with adj upper and lower A-arms,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall,strange chromemoly driveshaft. 9.2:1 383 TC78(10psi) 600hp 600ft/lbs
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Old 12-03-2010, 06:53 AM   #2 (permalink)
downplanetim
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AC delco 60g work just fine for my 92 6.2 175K miles, 95 6.5TD 293K miles below 30 degrees here at times no starting issues yet. They are little noisy for about 1-2 minutes.

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Old 12-03-2010, 07:59 AM   #3 (permalink)
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Bosch Duratherms seem to be the universally recommended "best" option for the 6.5.

AC Delco 60G's are also well recommended but require an extended runtime (upwards of 10+ seconds) to heat properly - this will require a glow override be put in place to either do so automatically, or manually.
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Old 12-03-2010, 09:52 AM   #4 (permalink)
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x2 for Bosch Duraterm. It can be purchased from RockAuto for very good price around $60 for a set of 8.

Forget about WAP or their rebrand (Instant Heat, Super Heat, High Heat, etc.) They have known to fail very fast like within a couple of month. This is only valid for 6.5 WAP.

As for hard start, make sure your Lift Pump is good. It is also a sign of failing PMD.
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Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator

Last edited by JMJNet; 12-03-2010 at 09:54 AM.
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Old 12-04-2010, 12:14 AM   #5 (permalink)
SS Duramax
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Quote:
Originally Posted by JMJNet View Post
x2 for Bosch Duraterm. It can be purchased from RockAuto for very good price around $60 for a set of 8.

Forget about WAP or their rebrand (Instant Heat, Super Heat, High Heat, etc.) They have known to fail very fast like within a couple of month. This is only valid for 6.5 WAP.

As for hard start, make sure your Lift Pump is good. It is also a sign of failing PMD.
PMD is a d-tech and is about a month old.
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2006 LBZ LT3 3500 CC. Banks Ram air intake and Super Scoop, 3" SS Heat wrapped and ceramic coated downpipe, MBRP 5" SS downpipe back exhaust.

1999 Hummer H16.5L TD, Ron Davis Aluminum radiator, HD water pump, Airraid air filter, 37" tires and locker stock

1996 Z28 SS clone.GMMG,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strano 1 lowering springs & swaybars,Spohn Road Race K-member with adj upper and lower A-arms,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall,strange chromemoly driveshaft. 9.2:1 383 TC78(10psi) 600hp 600ft/lbs
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Old 12-04-2010, 01:11 AM   #6 (permalink)
JMJNet
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Quote:
Originally Posted by SS Duramax View Post
PMD is a d-tech and is about a month old.
Unfortunately, a month old does not mean a thing even a day old does not mean that it cannot fail. Lately, Dtech are having trouble making reliable PMD. They were good at the beginning but seems that the quality had gone down the drain.
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1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator
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Old 12-04-2010, 03:37 AM   #7 (permalink)
SS Duramax
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Alright, so I just emailed the last owner and apparently it already has 60g's in it, about 1 1/2 years old, also I had the starter rebuilt less than 4 months ago. I don't have another PMD to change out so I can't check the current one, but this hard starting feels like a glow plug issue. What else can it be?
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2006 LBZ LT3 3500 CC. Banks Ram air intake and Super Scoop, 3" SS Heat wrapped and ceramic coated downpipe, MBRP 5" SS downpipe back exhaust.

1999 Hummer H16.5L TD, Ron Davis Aluminum radiator, HD water pump, Airraid air filter, 37" tires and locker stock

1996 Z28 SS clone.GMMG,KBDDSFC's,Spohn Adj TA w/DS loop,SJM chromemoly adj LCA's and PHB,Strano 1 lowering springs & swaybars,Spohn Road Race K-member with adj upper and lower A-arms,Strange 12 bolt with 4.11's,Pro Race 4L60E with 2800 stall,strange chromemoly driveshaft. 9.2:1 383 TC78(10psi) 600hp 600ft/lbs
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Old 12-04-2010, 08:54 AM   #8 (permalink)
PrivatePilot
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Don't rule out the glow plugs - all it takes is one boost using a fast charger to have possibly cooked some of them - GP's don't like high voltages.

There was actually a decal under the hood (if it's still there) that mentions that 6.5 equipped trucks should not be high-rate boosted for this very reason.

It's possible the PO (or perhaps even yourself, have you ever boosted/fast charged it?) inadventently damaged some of the GP's. The only way to 100% confirm would be to get an ohm meter and check them all out - the diagnostic procedure is very easy and will tell you for sure if the GP's are good or bad.

Also, 60G's require 10 seconds to heat up to proper temperature for startup - is the Wait To Start light staying on (solid) this long? Chances are the GP controller wasn't modified when the 60G's were installed and it's still cycling based on the original programming - which is inadequate for 60G's. Even cycling the key on and off won't provide adequate glow time for 60G's as the cycles after the first will be very short.

A glowplug override circuit is fairly easy to install if you are electrically handy...and then you can cycle the plugs for as long as you please before cranking - hold them on for 10-12 seconds and then start cranking (while leaving them on) and I think you may have a whole new startup experience. The 60G's are self-regulating so there's no worry about burning them out by overriding to a long cycle.
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SOLD: '97 C3500 Crew Cab Long Box Dually 6.5 Turbo Diesel.
Rebuilt with Navistar 506 block spring 2012
Special thanks to Racer55 and WhiteK2500 for their invaluable assistance!
Helping a friend: Duckies Longarm Quilting Oshawa / Durham Region!

Last edited by PrivatePilot; 12-04-2010 at 08:58 AM.
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Old 12-04-2010, 10:57 AM   #9 (permalink)
JMJNet
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The moral of the story on my post #6 is the same as privatepilot said, "Test everything again". PO may have rebuilt starter, what was changed when it was rebuilt? Probably the answer is "don't know". Things can go wrong very fast, thorough check is the only way to eliminate possible bad parts. Unfortunately, we don't have access to the truck so you have to do the test yourself.

The diagnostic checklist, while it is not perfect, is a good way for people to test parts systematically without missing anything.

Who knows your problem may be the Lift Pump?
__________________
1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator
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