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idles way up,then back down....then WAY back up,then back down...etc etc HELP PLEASE

If it comes down to that I might know where to lay hands on a "used but good" IP that won't cost too much, that was reported to running when it was pulled off the truck when original owner did a Cummins swap into his burb.
 
diesel timing.jpgI ran i few test on my truck with my snap on MTG-2500. Remember...its still new to me. There was only one code in it. Over reving of motor ? I can't get it to start again..... even tried ether again. I was playing around with my scanner not sure what the time thing meant but i took a pic of it. didn't know if it would help or not.
 
Not sure what to do now.... it won't even start now.
I only have internet from 8-10:30 am. No highspeed where i live.
but if somebody wanted to text me while i was trying to figure out what to do with my truck while i was around it would be awesome...
802-535-5663 Jeff

Thanks
 
It's not starting ? did you do anything to it ? that display you are seeing is showing when PCM is in control as 17 desired & 17 actual, you have to go one more step and look for a function called time set which takes out the PCM timing control and sets you up on base timing derived from IP position feedback , when you are at that screen you push the Yes command, at which time the desired display reading will go to 0 and the actual average goes to the timing avg to which the IP is currently positioned at per the manual should be 3.5 degrees on average, I like setting to a 3.8 average which that position gives you a TDCO setting of -1.5 to -1.94 (don't worry about that just yet) will explain that in detail later, for now we need to get you running.

I'm working nite shift 19-07:00 in AM CST check your PMs I just sent you my number here on site call me about 08:00 CST and we can discuss what you have going on.
 
The stored code was Over reving motor or something like that. I cleared it and tried to start it.

FYI just to be clear on my truck. I just got it and knew it wasn't running right but still think i got the better deal. Its a 98 K3500 6.5l diesel 1 ton dually with 165,000 miles. Its a very very clean truck. I traded a 95 chevy K1500 ext cab Z71 diesel that had a very good body few small issues. motor would skip when you got on it. Hills, load tryin to pass. still wasn't a bad truck. Even if i have to buy a reman motor ...i still think i got a good deal, least i would have a new motor. I have seen this truck run and this problem just started before we swapped. So...i have no idea how it started or what it did before this.

dually.jpg
 
And doc. you may already know this...but that pic was takin as i was trying to start it. it never did start not sure if that helps or not......... I'm on the east coast i'm thinkin you want me to call this am ? So i don't call at a bad time.....are you on here now? call me when your up.
 
Dont go by what the scanner says the code is, need the number since they get the number straight from the PCM, but a person had to program the scanner to identify what the code means. And often times its wrong.

Its not a real surprise if it wont start, we knew you either have a bad PMD or bad IP. So its time to start swapping parts, can try the PMD first since its simple and cheaper. Otherwise there are no-start diagnostics. First one being are ALL of the fuses good. I provided a means of testing PMD output on the first page, if its not outputting you arent getting any fuel, so you could do that test.
 
ok...i haven't yet we had a good snow storm the other day and i've been plowin. its been cold and she sits outside. LOL Another question for ya... the "wait to start light" flashes on...then off....back on....back off.... back on....etc. My last truck just stayed on for a lil while then went off. Is the glow plugs controller bad ? I called and ask the last owner how to get it started...he said Unplug the heater for about 1/2 hour.... pull the hose that goes to the PVC ? (thing on valve cover,not sure bein a diesel lol ) then shoot 3-4 shots of ether then wait till the Wait to start light cycles then it should start. I don't like using ether for one. but if i can get it started that way... could i get any better info with it running ?
 
Sounds like your glow plugs and controller need to be changed, ehter will destroy them. The only time the Glow plug light should flash like that is after the truck starts, or maybe after you crank and then leave ignition on. Then it would be called after glow. Compared to the pre-glow that is a continuous long glow. Now this is not causing your other problem, you still need a new PMD or IP.

So if your tuned port injection had a bad ignition coil or ignition module, you would probably have similar issues, but you just have a better idea how to parts swap on those, which gets expensive when you dont understand how something works to know where to start.

Sounds like the PO messed up the truck. If he used ether then you probably need new injectors too. It easy if you have read the real GM manuals and training materials and had the drawings in them. Its not hard, just different, so don't get discouraged, its a nice truck.
 
I'm trying not to... If it was my jeep...i'd know right where to start and the steps to take first. but...these are a pit different. lol I love the truck and soon as i get her going i'll be a happy camper....

Fyi...i did start at the first step...made sure it has fuel and even used a lil 911 changing fuel filter tonight.... any other steps to check ?
 
I would like to say a very VERY big Thank you to" Turbine Doc". (tim) Like i said...i'm new to the whole diesel thing. He talked to me a few time when i was at a loss. This man Know his stuff (nuttin bad about anybody else!) he went above and beyond To help me get my truck up and going... And runs runs like a champ now. A few bugs....but runs great !! Thank you very much sir for all your help and dealing with my dumbness about diesel's. I do learn quickly i will say. I CAN tell you after doin the pump myself self.... Not as bad as it looks. Soon as i can figure my power problem with a load up hill.... I think i'll call it good !! Wait.....are we ever REALLY done ? LOL
 
Turbine Doc said:
Most common cause of runaway engine or errant rpm more so than PMD is broken or worn armature shaft in the fuel solenoid in the distribution head of the IP, though it could be PMD since that is what drives the fuel solenoid.
Click to expand...

My money is on the PMD. They will cause alot of wierd issues. Won't tell you how I know. ;)
 
All i can say is that i am new to diesel's and learning as i go. lol
with that being said... i was told it was one or the other. so........ I BOUGHT THEM BOTH
truck runs great right now (other than think turbo not workin) runs and purrs great.
I DID buy the relocator for my new PMD. "just sayin" i was wondering after all was done if it was the PMD or pump. I plugged old PMD in and it works fine, so i'm guessing i will ave an extra PMD .

As for my turbo...i checked the pump and there IS suction at the line and the arm to the wastegate moves fine. I do not have a gauge hooked up as of yet. I just done thing the turbo is building boost for me. no power when pulling and alot of black smoke.
 
A spare PMD is always good to have.

Glad to hear that you solved the problem.

On the Turbo, also check for leaks on the lines. They are old and prone to leak.
If you don't want to deal with leaks or vacuum, get a Turbo Master.
 
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