Nice to see so many helpfulls out there. I am in Farmington Mn. and have a '94 gmc with a 6.5 that i am trying to figure out how to jump terminals to read the engine code (mine is OBD1), I know, paperclip but to what terminals, i need to figure out if I need an Injector pump or a pmd, 2 shops said put in an IP. another said read code first...

 

I just picked upa 98 CHevy 6.5 Turbo Diesel for my quad. I drove it home 2 hours away and when i went about 14 miles it started revin by its self and like choking itself out but not stalling. when i lift up off the throttle it just goes to idle. The truck starts up everytime fine. It idles fine it just wont drive or rev up. When im in park and i rev the motor it sounds sick and like backfires. when i drive it around 2000 rpms it starts misfiring and revving up and reving down. its like a throttle position would be messed up if it had one. I just dont know whats wrong with it.Anybody have any ideas. I am a jet engine mechanic so i am very mechanical incline. I build motors for fun. Please Help

 

Does the 6.5 liter have the same injector pump as the 6.2? If it does, it sonds like the check valve in the return line fitting is bad. a quick way to find out is: Take off your return line, unscrew the fitting it hooks too on the IP. Find a punch that will fit inside. lock the fitting in a vise and drive the punch thru with a hammer. The check ball is glass, it will shatter and you can blow it out. reassemble. If it runs fin now, then the problem is your injector pump seals are going out and plugging the return line. get your pump rebuilt asap, but this will work for the short run.

Think you need to post this in the 6.2/6.5 forum, not on the support forum. Hope you get it fixed.

 

i checked all fuses, all are good.im there are 2 wires cut on the drivers side in front of the firewall[red, yellow}

 

2003 f150 7.3 diesel died on freeway while driving
completly factory except towtruck acc.
been throught fuel system from microfilters to fuelfilter fuel is good but was dirty and almost a prob
still will wont run
fuses r all good
no engine light codes
tach has never worked stuck a 5000
wts light works
wondering where to go next

new to workin on diesels truck but have a shop and ready

 

This post is only a place to find someone to help. Not a place to post questions. You'll need a scan toll with live data as a minimum to fix your truck.

Sent from my DROID RAZR using Tapatalk 2

 

help

what would cause fuel pressure to go from 20lbs to zero then back up again
sometime taking my foot off thr pedal or pulling over and shutting it off for five min
starting up again fuel pressure is fine for about five min running time
can the ecm do this??
1998 5.9 24 valve cummins
i installed ddrp replacement a two years ago ,

thanks
chester

 

might soune lame but 3 things come to mind. low oil, low idle, and old oiil. what temperatures are you in, I had a similar occurance and the temperature was hovering aroung 0. kstart with the cheap and easy fixes b/4 you think something major. hmm was there any engine noise, knocking, rattling, anything different wht=en the pressure fluctuation started?

 

Chester,

The ECM might be able to do it...but I wold think it is a bad connection to the pump, or a bad pump myself. If you are good with wiring, I would check all wiring with an old school analog meter (Like a Simpson 260) first. 1 strad of wire will read good with a digital meter, but the old analog meters actually put a load on the wires and will show open if you have a partial break.

I am sure you do not want to hear it, but it most likely the pump if the fuel pressure is fluctuating that bad.

I am not sure how to check the ECM wiring to the pump, maybe someone else can tell you.

This should be in the Cummins forum. This thread is for people that are broke down and need help to get in off the road.

Hope this helps!

Offio

 

I think this is a very good idea We like in canada By 401 and 416 HWYS I am not great at diesels but willing to help have tools small garage welder room for trailers paddocks and barn for horses 20ft float pulling truck great mechanic next door need help up this way call do what we can 1-613-229-5837 Terry