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Old 02-17-2013, 05:00 PM   #1 (permalink)
JSarge
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Random timing loss.. Help!

So, i woke up this morning and fired the truck up. For the first 10 seconds of run time, it sounded normal, then all of a sudden the truck got nearly silent, sounding like a gas engine, and started pouring white smoke. The two video's below will explain just about everything you need to know about the situation.

I would much appreciate it if you can watch them, and give me some pointers. It is imperative that i get this thing running by tomorrow .. which is why im hoping and preying its a simple crank sensor or something along those lines.

Watch pt 1 first! Labeled them backward.


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[ '95 GMC C2500HD SLE 6.5TD 4L80E/G80/3.73 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
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Last edited by JSarge; 02-17-2013 at 05:02 PM.
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Old 02-17-2013, 05:29 PM   #2 (permalink)
JSarge
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Interesting update. Ran it around the block a few times, engine much quieter than usual, it did seem as if it was retarded (obviously) cause it had less power than usual. However, it was running okay and the smoke had dissipated. I decided to try and take a video.. Lol, as i go to hit the record button, the truck shuts off as if its a failing PMD. This PMD is 3 months old, been mounted on a heat sink behind the bumper its whole life .. MAYBE 3k miles on it. Well, it hesitated to start after shutting down, but once it fired back up .. it was back to its old self again. Louder, powerful, less smokey, as it was in the beginning. Drove it about 20 miles and nothing changed. Now im fooled this IS going to happen again .. so we need to hunt this crap down.

John
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[ '95 GMC C2500HD SLE 6.5TD 4L80E/G80/3.73 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
Vac pump del DE 3" down pipe w/ 4" straight pipe exits before axle H/O water pump 195 degree tstat
Manual Boost/Fuel Pres gauges Walbro FRC-10 Lift pump FFM delete Volvo marine water seperator/filter
Bumper mounted FSD Home made TM @ 10 PSI Lube specialists oil line's Rebuilt 506 w/ ARP main studs


[ '88 GMC C3500 DRW SLE 6.5TD TH400/DANA 80/4.10 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
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6.5 FAQ L@@K!: Click Here!
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Old 02-17-2013, 05:31 PM   #3 (permalink)
sctrailrider
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I'm not up to snuff on the electronic motors but I don't think you can get the right readings until the temps are above 170*, and I could be wrong but if you unplug the crank sensor you should do the KOKO to reset the pump timing and go from there with the tuning.

It might be the vid but there sounds like a knock in the vid..
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Old 02-17-2013, 05:36 PM   #4 (permalink)
JSarge
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Quote:
Originally Posted by sctrailrider View Post
I'm not up to snuff on the electronic motors but I don't think you can get the right readings until the temps are above 170*, and I could be wrong but if you unplug the crank sensor you should do the KOKO to reset the pump timing and go from there with the tuning.

It might be the vid but there sounds like a knock in the vid..
Not familiar with the 'KOKO". I'll do some research .. Definitely no knock, im recording on a 4 year old android phone running 1.2.x. I'm very anal on hearing things, and would recognize it. Plus, this engine was assembled with zero corners cut, and theres only ~400 miles on it. Well, minus using old sensors but hey what the hell!
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[ '95 GMC C2500HD SLE 6.5TD 4L80E/G80/3.73 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
Vac pump del DE 3" down pipe w/ 4" straight pipe exits before axle H/O water pump 195 degree tstat
Manual Boost/Fuel Pres gauges Walbro FRC-10 Lift pump FFM delete Volvo marine water seperator/filter
Bumper mounted FSD Home made TM @ 10 PSI Lube specialists oil line's Rebuilt 506 w/ ARP main studs


[ '88 GMC C3500 DRW SLE 6.5TD TH400/DANA 80/4.10 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
SOLD

6.5 FAQ L@@K!: Click Here!

Last edited by JSarge; 02-17-2013 at 05:37 PM.
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Old 02-17-2013, 05:48 PM   #5 (permalink)
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There is no KOKO on an OBD1 thats for 1996 OBD2 & newer
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Old 02-17-2013, 06:02 PM   #6 (permalink)
JSarge
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Quote:
Originally Posted by crankme69 View Post
There is no KOKO on an OBD1 thats for 1996 OBD2 & newer
Thank you for verifying that.

Well, again, i ran it another 10 miles. No hickups, no timing loss, it IS running a bit rough but im sure the TDCO got screwed up as i was messing with .. other than that, i dont understand how this decided to happen out of no where. ANY ideas appreciated.

P.S. .. now that i listen to the second video, i can hear a knock but its definitely the video. I think the crap mic is picking up the sound of the straight pipe in the back ground. Just try to ignore.
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[ '95 GMC C2500HD SLE 6.5TD 4L80E/G80/3.73 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
Vac pump del DE 3" down pipe w/ 4" straight pipe exits before axle H/O water pump 195 degree tstat
Manual Boost/Fuel Pres gauges Walbro FRC-10 Lift pump FFM delete Volvo marine water seperator/filter
Bumper mounted FSD Home made TM @ 10 PSI Lube specialists oil line's Rebuilt 506 w/ ARP main studs


[ '88 GMC C3500 DRW SLE 6.5TD TH400/DANA 80/4.10 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
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6.5 FAQ L@@K!: Click Here!

Last edited by JSarge; 02-17-2013 at 06:10 PM.
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Old 02-17-2013, 06:27 PM   #7 (permalink)
Big Blue DSL
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Random timing loss.. Help!

So you said in your video that it won't run without the crank sensor plugged in?
It should run off the optical sensor with extended crank time.....do you have the filter harness on the optical sensor


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in the works...... just a few more things
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Old 02-17-2013, 06:38 PM   #8 (permalink)
JSarge
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No, the filter is not plugged in. Its somewhere about 120 miles from me, but it has been doing fine without it. How much extended crank time? I was only cranking it for the typical 3-5 seconds with the crank sensor unplugged, and it not starting. Should i go for 10-15 seconds without the crank sensor? Even if i decide to do this, all it will be telling me is that the optical sensor is good or bad right?
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[ '95 GMC C2500HD SLE 6.5TD 4L80E/G80/3.73 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
Vac pump del DE 3" down pipe w/ 4" straight pipe exits before axle H/O water pump 195 degree tstat
Manual Boost/Fuel Pres gauges Walbro FRC-10 Lift pump FFM delete Volvo marine water seperator/filter
Bumper mounted FSD Home made TM @ 10 PSI Lube specialists oil line's Rebuilt 506 w/ ARP main studs


[ '88 GMC C3500 DRW SLE 6.5TD TH400/DANA 80/4.10 "F" TRIM - Ext Cab/Long Box ] Rebuild Thread: Click Here!
SOLD

6.5 FAQ L@@K!: Click Here!

Last edited by JSarge; 02-17-2013 at 06:38 PM.
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Old 02-17-2013, 06:40 PM   #9 (permalink)
Big Blue DSL
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Random timing loss.. Help!

If u unplug the crank sensor when it's running does it shut off


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1995 suburban K1500(known to us as "marbles")398500km
New 18:1 engine(10000KM ago),stud girdle, balanced,DSG gear Drive, Diamond pre-chambers,HO water pump and dual T/Stats,marine injectors,3" down pipe, 4" downpipe back DUAL exhaust from diamond eye,new pensacola ds4 pump,home made remote filters and carter lift pump,home made FTB mod(drilled out fitting in IP,HUMMER hydraulic cooling fan, HOLSET HX40W,Peinisular intake. Now rocking a six banger by buddy and it flat out rocks!
in the works...... just a few more things
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Old 02-17-2013, 06:42 PM   #10 (permalink)
Big Blue DSL
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Random timing loss.. Help!

Yes that's correct it will diagnose the optical sensor


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1995 suburban K1500(known to us as "marbles")398500km
New 18:1 engine(10000KM ago),stud girdle, balanced,DSG gear Drive, Diamond pre-chambers,HO water pump and dual T/Stats,marine injectors,3" down pipe, 4" downpipe back DUAL exhaust from diamond eye,new pensacola ds4 pump,home made remote filters and carter lift pump,home made FTB mod(drilled out fitting in IP,HUMMER hydraulic cooling fan, HOLSET HX40W,Peinisular intake. Now rocking a six banger by buddy and it flat out rocks!
in the works...... just a few more things
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