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Old June 15th, 2009, 10:52 PM   #1
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Default 1994 Suburban 6.5 diesel surging

my suburban is surging, just takes off on me. When it takes off it just pours the black smoke and the fuel pressure gauge spins 360 counter clockwise. It's a totally random thing. It will be fine for weeks, then act up. If I shut it down and let it sit for a while it fine. Any help would be appeciated
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Old June 15th, 2009, 11:29 PM   #2
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thats a sign that the pmd is about to puke on you
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Old June 16th, 2009, 07:50 AM   #3
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The PMD is less than 2 yrs old and is relocated to a different spot
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Old June 16th, 2009, 05:46 PM   #4
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sounds like its sucking air. could just be fuel scum. try some bio treatment before you do anything else.
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Old June 16th, 2009, 07:08 PM   #5
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I talked to a couple people and got some ideas. the truck is throttle by wire and the sensor could be bad, or the diesel version of a pcv valve (don't know what it's called) is bad and sucking oil. Any possibilitys of these being the culprit?
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Old June 16th, 2009, 07:17 PM   #6
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doubtful. if you were sucking oil you'd get more of a runnaway condition that would last minutes not seconds. secondly the holeffect sensors are really susseptible to dirt & crud in the fuel. the one thing that everyone seems to ignor is fuel conditioner. I have been down this road many times. if the fuel is the problem it plugs filters and acts wierd. if its a pump issue like I have seen the thing throws a code most often before you know theres an issue. a code 99 is a crank sensor error on yours and would be caused if you had the pump off and didn't reset the computor to see it. they are very easy engines to work on just not very clean. the one thing that seems to be the common denominator is time. if its never had a pump and its around 120,000 miles its about due. roostamaster pumps are well known for this. yours would be around $2400 to rebuild plus 7 hours($100 per hour) labor to install.

...try the conditioner first.
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Old June 16th, 2009, 07:56 PM   #7
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I talked to a couple people and got some ideas. the truck is throttle by wire and the sensor could be bad, or the diesel version of a pcv valve (don't know what it's called) is bad and sucking oil. Any possibilitys of these being the culprit?
the petal sensor rarely goes bad, the pcv valve you are talking about is the cdr valve , oil does get through it but when it plugs up it makes all the engine seals leak, a good cleaning to it with some brake cleaner solves that problem and is cheaper than the $42 for it at napa(or about $80 at autozone).

where was the pmd/fsd relocated to, i hope behind the bumper or it is a good chance it is bad again, the biggest mistake people make is to mount it on the intake which is far hotter than keeping it mounted on the pump, best place is out of the engine bay all together.
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Old June 16th, 2009, 08:01 PM   #8
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doubtful. if you were sucking oil you'd get more of a runnaway condition that would last minutes not seconds.
the 6.5 can take quite a bit of oil before it gets a runaway condition, on a really bad engine you could do away with the cdr and run a hose right into the turbo intake and still not get it to runaway, its pretty rare on a electric 6.5

i could not agree more about additives to the fuel, diesel service silver to every tank is a good thing with the new ulsd on these older engines, that optical sensor can be a picky little bugger and good fuel with additives helps keep it happy.
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Old June 16th, 2009, 09:31 PM   #9
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you sound like you know these pretty well. the majority of things I every saw were fuel related at the dealer. people think you can shit in the tank of a deisel and it will run. its just the opposite. they are picky buggers indeed. I had a couple drive me crazy trying to diagnose. the damn things both turned out to be fuel issues to. bacteria growing in the fuel and blocking the fuel pick ups under certain conditions and made a starvation condition like the lift pump was bad.
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Old June 16th, 2009, 09:58 PM   #10
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looks like I'll run to the parts store tommorrow and get some fuel additive. at least it's a place to start
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Old June 16th, 2009, 11:15 PM   #11
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you sound like you know these pretty well. the majority of things I every saw were fuel related at the dealer. people think you can shit in the tank of a deisel and it will run. its just the opposite. they are picky buggers indeed. I had a couple drive me crazy trying to diagnose. the damn things both turned out to be fuel issues to. bacteria growing in the fuel and blocking the fuel pick ups under certain conditions and made a starvation condition like the lift pump was bad.
i knew other diesels(have been wrenching in general for almost 30 yrs) but took a crash course in the world of the 6.5 when i got my 98 crew dually 4x4, i wish i had known when i bought it to not get the 97-2001 #506 block 6.5 as mine has the common oil squirter crack in the block and the also common broken #2 main cap from a bad balancer/dampener pulley.
the 6.5 section on dieselplace is the best place to find anything and everything about the 6.5 known to man.

i im going to replace mine with a 6.2 with the newer 6.5 heads and cooling system

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Old June 17th, 2009, 06:09 PM   #12
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sounds like you got a peach. I have seen others spit parts right out of the pan. I had one of the old 5.7 in a `79 old royal with 29,000 mile spit the crank out in 4 peices, it tore mains right out with the block connected to them. the car was mint and the engine blew back in `93. it was one of those "GM designed" grenades. the 62 still sucked for a long time but after `84 they got tons better. the glow pugs were the worst on the early ones with the screw in controler. if you can find truck engine with the mechanical distributor and do away with the electronic crap. lots of them potato chip trucks had them
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Old June 17th, 2009, 11:46 PM   #13
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sounds like you got a peach. I have seen others spit parts right out of the pan. I had one of the old 5.7 in a `79 old royal with 29,000 mile spit the crank out in 4 peices, it tore mains right out with the block connected to them. the car was mint and the engine blew back in `93. it was one of those "GM designed" grenades. the 62 still sucked for a long time but after `84 they got tons better. the glow pugs were the worst on the early ones with the screw in controler. if you can find truck engine with the mechanical distributor and do away with the electronic crap. lots of them potato chip trucks had them
then i would have to do away with the 4l80e or run a stand alone ecm to run it and that's not an option or i would have put a big block in it and call it a day.
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Old October 4th, 2009, 09:59 PM   #14
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Does anybody have access to a Tech II and the knowledge to set the timing on a 6.5 diesel??????????????????



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