6.5 stalling issue

[94chevy]

I have a 94 6.5td with a stalling problem, It stutters when I put the throttle down then just shuts down but then it fires back up and runs fine, then after a couple miles it does it again. any info would be greatly appreciated

 

[3500GMC]

Welcome to TTS. Let's try and get the ball rolling by taking a few minutes to fill out in as much detail as possible the following checklist:

Link with instructions.

http://www.thetruckstop.us/forum/showthread.php?6300-6-5-Engine-Diagnostic-Troubleshooting-Checklist

 

[94chevy]

Problem: Explain your problem in concise language (ie: Cranks but won’t fire). _Hesitation then stall on the road___________________________

Demographics: tell us about your truck and your ambient conditions:

- Year: 94______
- Truck model and class (ie: c2500) k2500_________
- Automatic or Standard ___automatic_______
- Mileage: (indicate miles or km) ____190,000 miles_____
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc) _rebuilt transmission__________
- Model: ‘S’ or ‘F’ engine, NA or Turbo, EGR? ______turbo________
- Ambient outside temp: (indicate *C or *F) __70 degrees f________
- What fuel are you using? (#1 Diesel, #2 Diesel, Bio, VO, WVO, etc) __#1 diesel_______
- What fuel additives are you using? ___________
- Where are you located? _Vermont____________

General maintenance: inspect and evaluate the condition of each. When were they last changed?
- Air filter _last week________
- Fuel filter __dont know_______
- CDR Valve? _________
- Coolant – last flushed/replaced at _____________
- Oil – synthetic/regular, changed at ___________
- Batteries – state of charge, (matched set) replaced at _____________
- Battery cables and grounds (removed, cleaned and tightened): ______________
- Glow Plugs - how many miles on them? _________ What type? _____________
- Injectors - last changed at _______________


History: (Describe how the problem first appeared.)
- What were you doing when it happened? Driving down the road______________
- How was the truck running fine before this problem appeared? ran great_____________
- Has this problem ever happened before? ____nope___________________
- Describe any related factors that might be part of the problem. ______________
- Have you checked for DTC (Diagnostic Trouble Codes)? (Y.N) _N___ And? ________


Diagnostics:

1] Starting:
1a] Does the engine start? __yes_______
1b] Does the engine crank over? yes________
1c] Are your batteries fully charged?yes _________
1d] Have you removed, cleaned, and tightened all battery connections? __yes______
1e] Does your Wait to Start light come on for a time? How long? ___no______
1f] Does your glow plug light come on? __yes_______ For how long? _15 sec________
1g] Do you see smoke from the exhaust while cranking? What color? __yes dark gray______
1h] Does the Service Engine Light Glow during Start/bulb check? _yes_______

2] Fuel Issues (if not running):
2a] Can you hear your lift pump working? __yes__________
2b] Do you get a steady flow of fuel from the water drain (T-handle) ? _________
2c] Loosen the inlet line from the IP – is fuel coming out (Lift Pump on)? ___________
2d] Loosen an injector line and crank the engine - does fuel come out? _________
2e] Do you hear a vacuum (hiss) when you remove the fuel cap? ______yes_____

3] PMD / IP Issues
3a] Location of PMD (on pump, on intake, remote mounted) __on pump_________
3b] Condition of Extension harness (if used) Vendor or Homemade? _________
3c] Condition of grounds / ground wires to IP / PMD. Check Harness. _________
3d] PMD Make: ___________
3e] PMD Age: _____________

4] Stalling Issues
4a] Do you experience stalling only when hot? ____yes________
4b] Does it stall under particular circumstances? (ie hit bump, or on accel) __accel____
4c] Does pouring cool water over the IP seem to help with restarting? _________
4d] Is stalling momentary (engine recovers)? __no have to restart_______
4e] Does SES light come on when engine hiccups? ____yes_____
4f] Does cruise control quit working when engine hiccups? ___________
4g] Does re-starting seem to reset engine, restoring cruise and power? ___yes______
4h] Changes to dash lights or instruments during stalling events? ___________

5] Running Issues
5a] On cold start, does upper rad hose get hard before engine warms up? ____no___
5b] Any bubbles or oil film in coolant overflow tank? __no_____
5c] Any white slime on oil surfaces (dipstick, CDR, oil Fill cap)? __no________
5d] Excessive white smoke from exhaust on cold start? __yes_______
5e] Excessive black smoke from exhaust under hard acceleration? __________

6] Performance Issues
6a] Do you have gauges (boost, EGT) ? ____no_______
6b] Maximum boost under load? ____________
6c] Have you added a performance PCM (reflash) or Chip? ___no___________
6d] Have you changed exhaust / downpipe / crossover? _______yes_________
6e] Wastegate – mechanical or vacuum (OEM)? __________oem____

7] Temperature-related Issues:
7a] Single or dual thermostats? ____________
7b] Have you replaced them lately? Manufacturer of replacements? _________
7c] Have you pulled and cleaned Radiator and coolers lately? ____________
7d] Have you replaced the fan clutch? Manufacturer of replacement? ________
7e] (winter) Have you tested your antifreeze? Good to what temp? __________
7f] (winter) Are you using a winter grille cover? ___________

List and describe any other factors which are not addressed in this checklist. We can’t see, hear, smell, or touch your truck, so the more descriptive information you can give, the more likely it is that somebody can assist you.

_________________________________

 

[ak diesel driver]

I'd start by trying a different ( new) PMD

 

[94chevy]

Thats what I'm thinking, Thanks

 

[JMJNet]

x2 on PMD.

You also need to do 2b.

While you can hear the LP running but not necessarily pumping fuel during engine run.

 

[Big T]

I'd start by trying a different ( new) PMD

Remote mount the new PMD. See Leroy Diesel in the vendors here.