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Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

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  #1  
Old 04-06-2012, 05:04 PM
Diesel Fan

   

Default i need help 6.5 turbo shut off and wont start i have replaced everything

ok guys im new so go easy if i do somthing wrong. I have a 94 2500 6.5 turbo ive only had it about 8 weeks the other day while driving it shut off like it was out of fuel i read alot about the pmds i looked all through the form and was convinced it was the pmd so i bought a brand new one itstalled it and still wouldnt start im not tha type to just replace things till i find the problem but being i didnt know the history on the truck and read the form i was sure the pmd was it so after it still didnt start i read more and more i tested everything according to the form and couldnt find no problems so i was convinced it was the ip i pulled it off and discoverd i had a odd ball ip 5068 so i send it to pensacola fuel injection and had it rebuilt got it back and installed it and it still wouldnt start then i was sick and puzzled so i read more oh i had the codes read before i started and it showed 13 so i figuredi was over looking somthing so i looked again and did more checks and couldnt find any thing so i replaced the crank sensor still nothing so a few people i talked to convinced me it was the ecm they said that was all that was left well i bought a rebuilt 1 installed it same thing want start so i lost yes its got fuel i even added 10 gal before i repalced any thing to make sure that wasnt the problem lift pump is working i even bypassed the op switch still nothing it just spins and spins has plenty of commpression and isnt making any strange noises im getting fuel to the ip but nothing out of it i checked the old pump before i removed it and the new pump no fuel comming out i checked return lines there free flowing do you guys think maybe the prom is bad because the new ecm didnt have a prom and i had to install mine? i found where someone said the green wire going to the pmd should have 1.2vdc while cranking this is the signal wire mine only has 0.4 while turning over i checked it at the connector and the ecm it didnt change what would be causeing this and could this be my problem why theres no fuel comming out the ip please guys i need help im out of cash and have no wheels sorry for all qustions do any of you have any suggestions of what it could be or any thing else to check its hade me puzzled for 3 weeks now im gonna keep working on it but i dont know what else to do ill keep yall posted if i get her back going and also what the final issue ends up being if i find it
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  #2  
Old 04-07-2012, 10:31 AM
ebarresi5894's Avatar
Diesel Wrench

   
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Default

so..... the fuel pump works? your getting fuel? its kinda jumbled make it simple.

is there fuel to the filter?
can you hear the lift pump run?
can you smell diesel?
PM me if you would like too

ebarresi5894's Sig:97 2500 12V 140k gauges, tuned AFC, #100 fuel plate, 3K GSK, 5" Stacks, BHAF,

97 3500 12V 180k AFC tuned, no fuel plate, adjustable OFV, 1/2" lines, big line kit, 3k GSK, 7" Stacks, K&N intake, Rebuilt tranny billet TC, Shift kit,
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  #3  
Old 04-07-2012, 11:56 AM
Diesel Fan

   

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Thanks for the reply yes it's got fuel to the filter and IP the lift pump is working I even strait wired it and let it run constant while trying to start it I even checked the pressure at the tee valve and its good I don't smell fuel its not getting fuel to the injectors
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  #4  
Old 04-07-2012, 04:27 PM
great white's Avatar
Diesel Enthusiast
Status: Just an ol' wrench lookin to pay it forward...

   

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I don't want to sound like your grammar teacher, but you're going to have to rewrite your first blurb with some punctuation and paragraphs.

I just couldn't read it.

I got a couple blurbs that might indicate a few things, but you really need to rewrite that and organize it a bit.

One thing I did pick out was that you changed the IP.

Did the new pump come with a new PMD or have you installed a new one yet?

*edit*

Nevermind, it was so confusing in the middle I completely lost that you had already installed a new PMD.....

Last edited by great white; 04-07-2012 at 04:30 PM..
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  #5  
Old 04-07-2012, 05:20 PM
Diesel Fan

   

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let me start by saying it just shut off while driving down the road and want start back. I have replaced the ip its a rebuilt one with a new pdm.I installed a new crank sensor. I installed a reman ecm. It turns over good has good compression but want start. I checked fuel pressure @ the tee fitting and its good i even strait wired the lift pump i let it run constant while trying to start it. Its getting good fuel to the ip but none coming out of the ip. On the harness going to the ip the red wire has 5.5dc the pink wire has 12.30 the lt green pin c is a ground and the lt green pin a only has 0.3 while cranking it. The new ecm i installed didn't come with the prom i used my old prom. I have checked all the fuses and all the connectors and inspected the harness what am i missing please help. The truck is a 94 2500 6.5 turbo with auto 4x4 with 160,000 its all stock as far as i know i've only had it about 8 weeks it ran great no issues till last week when it shut off it was like it run out of fuel no strange nosies or nothing it just shut off and i've even put more fuel in to double check that the gauge is working i dont no what else to do i think i've done replaced everything well everything except what is wrong with it. Thanks again for yalls help and i'll keep you posted with what i find.
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  #6  
Old 04-07-2012, 07:12 PM
great white's Avatar
Diesel Enthusiast
Status: Just an ol' wrench lookin to pay it forward...

   

Default

Originally Posted by bushwacker View Post
let me start by saying it just shut off while driving down the road and want start back. I have replaced the ip its a rebuilt one with a new pdm.I installed a new crank sensor. I installed a reman ecm. It turns over good has good compression but want start. I checked fuel pressure @ the tee fitting and its good i even strait wired the lift pump i let it run constant while trying to start it. Its getting good fuel to the ip but none coming out of the ip. On the harness going to the ip the red wire has 5.5dc the pink wire has 12.30 the lt green pin c is a ground and the lt green pin a only has 0.3 while cranking it. The new ecm i installed didn't come with the prom i used my old prom. I have checked all the fuses and all the connectors and inspected the harness what am i missing please help. The truck is a 94 2500 6.5 turbo with auto 4x4 with 160,000 its all stock as far as i know i've only had it about 8 weeks it ran great no issues till last week when it shut off it was like it run out of fuel no strange nosies or nothing it just shut off and i've even put more fuel in to double check that the gauge is working i dont no what else to do i think i've done replaced everything well everything except what is wrong with it. Thanks again for yalls help and i'll keep you posted with what i find.

Well, since you've already changed everything expensive, I've only got two suggestions for you;

1. clean the PCM ground on the passenger rear side of the manifold:

Click the image to open in full size.

High resistance here can cause the symptoms you describe. Clean teh other grounds as well

2. Ignition switch. These deteriorate over time and cause all kinds of weird issues.

That's about all I've got.

Boy, are you going to be some mad if you clean the grounds and it starts!



I would be if that fixed it after spending all that dough.......
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  #7  
Old 04-07-2012, 09:31 PM
Diesel Fan

   

Default

Great white thanks for the reply tomorrow i'll check the grounds but off the top of my head i dont think there is a ground there. I know there is a main ground on the driver side front of the intake. I hope thats my problem but somone has put new heads on the truck in the past they may didnt hook the grounds back up in that location. I will find them in the morning if there not there and move them and be sure there grounded good. The ignition switch has been changed at some point also. I noticed that it has a black harness comming from it and plugged up under the dash as if it was a late model with the dieod in the switch but the keys are just plain keys. The keys had been working fine do you think they could be my prolem does a 94 have the theft key? I'm betting its a ground after seeing that pic. I'm about sure the grounds arnt there. Well im going to be mad if thats the problem after spending all the cash but I will be glad to have my truck back going and least i'll know a what parts have been replaced if i have trouble in the future i'll keep you posted tomorrow with what i find i want to get a flash light and go see about her now i want be able to sleep tonight thinking about it. Well thats nothing new i havnt slep all week trying to figure it out. Thanks again
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  #8  
Old 04-08-2012, 04:58 AM
great white's Avatar
Diesel Enthusiast
Status: Just an ol' wrench lookin to pay it forward...

   

Default

Those grounds need to be connected. Among other things, it provides the ground for the PCM.

The PCM ground resistance must be minimal since the signals need to be clean for proper operation. If those grounds aren't connected, the PCM will have to try and ground through another component which makes the signal "dirty" and can cause all kinds of problems.

You may or may not have a vtd called "passlock".

I'm not sure if it came as early as 94.

You'd have a dash light "security" lit up if it was your problem. It would also light up when you turn the key and the cluster does it "bulb check" at first start if your truck has it.

It's a pita system.

Prone to failure, it will let the truck start and kills the engine a few seconds later.

There is no "chipped" key. There's a signal sent from the column cylinder when it's turned and the PCM looks for this signal. It's so stupid and pointless it can be fooled with a simple resistor. It's also a really stupid system because all a thief has to do is jamb a screwdriver in the key slot and force the cylinder to turn. The truck will start and run fine.

About all the passlock system is good for is frigging up and screwing the legitimate owner over when it fails.

And it will fail........they all do eventually. Either the cylinder or the passlock module.

I always turn the pita system off when I reflash a PCM.....unless the guy specifically requests it be left on.


Sent from my iPhone using Tapatalk

Last edited by great white; 04-08-2012 at 05:11 AM..
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  #9  
Old 04-09-2012, 06:25 PM
Diesel Fan

   

Default

I checked the grounds they where bolted to the back of the head i cleaned them good but still no fuel. I only have one black wire coming out of the harness that you said where the ecm grounds i checked everywhere and i cant find another one. I also cleaned all the other grounds good. What am i over looking i have never had a truck beat me up like this. I got good fuel pressure to the ip but nothing coming out im not getting power to the fuel solenoid on the back of the ip. Even if it was out of time fuel should still come out of the ip right? or no? Please guys i need help what am i missing ive checked everthing i know and replaced everything what am i over looking?
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  #10  
Old 04-10-2012, 09:51 AM
Diesel Fan
Status: Tinkerer

   

Default

did you say you are not getting power to the fuel solenoid? That is the problem if it is not getting energized. Nothing will come out of the injection pump if that is off.

bftrain's Sig:2007 Mega Cab 5.9 HO Cummins with 6 speed manual
1983 6.2 Suburban 3/4t
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