vbpeder
New Member
Problem: Explain your problem in concise language __Bought truck to try 5th wheeling. Had 230,000km on odometer. Did not get much driving done . Recently it started to fishbite at 1500rpm.
Read everything I could find on the different forums. Thought the EGR (truck is S vin) was at fault. Can make problem disappear entirely by unpluging the egr valve, but the eng light always comes on for insufficient egr flow or similar code . Waste gate works fine, can hear the turbo, and it rotates freely.
Tried several different things, none solved it. The long and short is have a new vacuum system, solenoids, vacuum lines, map , maf, etc. Vacuum pump shows 23 on the vacuum guage when tested.
No fix but truck does run better. Now when driving and eng gets up to temp (80'C +/-) get what I could best describe as sounding like pre-inition on a gas eng, with loss of power and smoke out the tailpipe, greyish in colour.
The problem goes avay if egr is disconnected. The truck then runs fine in all aspecsts as far as I can tell. Can also get it to disappear by downshifting to 2nd or 1st gear, and it will run fine as long as the rpm is up around 2000rpm. No codes have shown up except for the ones I self induce by trying different things to fix this.
The cruise control works ok and the torque lock up seems to work also.
Any ideas for me because I'm out of ideas and even the local dealer can only suggest I leave it with them for a while!!______________________
- Year: ___1998___
- Truck model and class (ie: c2500) ____c2500 Cheyenne_____
- Automatic or Standard __Auto________
- Mileage: (indicate miles or km) ___232,000km/145,000mi______
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc) __not yet_________
- Model: ‘S’ or ‘F’ engine, NA or Turbo, EGR? ____S Turbo___has EGR_______
- Ambient outside temp: (indicate *C or *F) ___15'C/ 59'F_______
- What fuel are you using? (#1 Diesel, #2 Diesel, Bio, VO, WVO, etc) ___#2______
- What fuel additives are you using? ____none_______
- Where are you located? ____Nova Scotia, Canada _________
General maintenance: inspect and evaluate the condition of each. When were they last changed?
- Air filter ___New______
- Fuel filter ___New______
- CDR Valve? __unkown_______
- Coolant – last flushed/replaced at ___185,000km__________
- Oil – synthetic/regular, changed at ___230,000km________
- Batteries – state of charge, (matched set) replaced at __2 new 2009___________
- Battery cables and grounds (removed, cleaned and tightened): _____all last week_________
- Glow Plugs - how many miles on them? ___n/avail______ What type? ___n/avail__________
- Injectors - last changed at ___n/avail. Truck was maintained regularly at a dealer by a retired gent.____________
History: (Describe how the problem first appeared.)
- What were you doing when it happened? ____cruise on hwy__________
- How was the truck running fine before this problem appeared? ___no issues__________
- Has this problem ever happened before? ___not till that first time then recurring problem____________________
- Describe any related factors that might be part of the problem. ______________
- Have you checked for DTC (Diagnostic Trouble Codes)? (Y.N) _Y___ And? ___only self generated during diagnosis_____
Diagnostics:
1] Starting:
1a] Does the engine start? __starts fine_______
1b] Does the engine crank over? ____Y____
1c] Are your batteries fully charged? _____Y____
1d] Have you removed, cleaned, and tightened all battery connections? ______Y__
1e] Does your Wait to Start light come on for a time? How long? __abt 5 - 10 sec_______
1f] Does your glow plug light come on? _________ For how long? _________
1g] Do you see smoke from the exhaust while cranking? What color? __N______
1h] Does the Service Engine Light Glow during Start/bulb check? ___Y_____
2] Fuel Issues (if not running):
2a] Can you hear your lift pump working? __Y__________
2b] Do you get a steady flow of fuel from the water drain (T-handle) ? Y
2c] Loosen the inlet line from the IP – is fuel coming out (Lift Pump on)? ____Y_______
2d] Loosen an injector line and crank the engine - does fuel come out? __Y_______
2e] Do you hear a vacuum (hiss) when you remove the fuel cap? ______N_____
3] PMD / IP Issues
3a] Location of PMD (on pump, on intake, remote mounted) _Intake manifold__________
3b] Condition of Extension harness (if used) Vendor or Homemade? ___V______
3c] Condition of grounds / ground wires to IP / PMD. Check Harness. ___OK______
3d] PMD Make: __Heath_________
3e] PMD Age: ___Unknown__________
4] Stalling Issues NONE
4a] Do you experience stalling only when hot? ____________
4b] Does it stall under particular circumstances? (ie hit bump, or on accel) ______
4c] Does pouring cool water over the IP seem to help with restarting? _________
4d] Is stalling momentary (engine recovers)? _________
4e] Does SES light come on when engine hiccups? _________
4f] Does cruise control quit working when engine hiccups? ___________
4g] Does re-starting seem to reset engine, restoring cruise and power? _________
4h] Changes to dash lights or instruments during stalling events? ___________
5] Running Issues NONE
5a] On cold start, does upper rad hose get hard before engine warms up? _______
5b] Any bubbles or oil film in coolant overflow tank? _______
5c] Any white slime on oil surfaces (dipstick, CDR, oil Fill cap)? __________
5d] Excessive white smoke from exhaust on cold start? _________
5e] Excessive black smoke from exhaust under hard acceleration? __________
6] Performance Issues
6a] Do you have gauges (boost, EGT) ? ____N______
6b] Maximum boost under load? ____________
6c] Have you added a performance PCM (reflash) or Chip? ______________
6d] Have you changed exhaust / downpipe / crossover? ________________
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? _Flushed @185000km_________
7d] Have you replaced the fan clutch? Manufacturer of replacement? __N______
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.
Thanks for any help you can pass on. vbpeder
Read everything I could find on the different forums. Thought the EGR (truck is S vin) was at fault. Can make problem disappear entirely by unpluging the egr valve, but the eng light always comes on for insufficient egr flow or similar code . Waste gate works fine, can hear the turbo, and it rotates freely.
Tried several different things, none solved it. The long and short is have a new vacuum system, solenoids, vacuum lines, map , maf, etc. Vacuum pump shows 23 on the vacuum guage when tested.
No fix but truck does run better. Now when driving and eng gets up to temp (80'C +/-) get what I could best describe as sounding like pre-inition on a gas eng, with loss of power and smoke out the tailpipe, greyish in colour.
The problem goes avay if egr is disconnected. The truck then runs fine in all aspecsts as far as I can tell. Can also get it to disappear by downshifting to 2nd or 1st gear, and it will run fine as long as the rpm is up around 2000rpm. No codes have shown up except for the ones I self induce by trying different things to fix this.
The cruise control works ok and the torque lock up seems to work also.
Any ideas for me because I'm out of ideas and even the local dealer can only suggest I leave it with them for a while!!______________________
- Year: ___1998___
- Truck model and class (ie: c2500) ____c2500 Cheyenne_____
- Automatic or Standard __Auto________
- Mileage: (indicate miles or km) ___232,000km/145,000mi______
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc) __not yet_________
- Model: ‘S’ or ‘F’ engine, NA or Turbo, EGR? ____S Turbo___has EGR_______
- Ambient outside temp: (indicate *C or *F) ___15'C/ 59'F_______
- What fuel are you using? (#1 Diesel, #2 Diesel, Bio, VO, WVO, etc) ___#2______
- What fuel additives are you using? ____none_______
- Where are you located? ____Nova Scotia, Canada _________
General maintenance: inspect and evaluate the condition of each. When were they last changed?
- Air filter ___New______
- Fuel filter ___New______
- CDR Valve? __unkown_______
- Coolant – last flushed/replaced at ___185,000km__________
- Oil – synthetic/regular, changed at ___230,000km________
- Batteries – state of charge, (matched set) replaced at __2 new 2009___________
- Battery cables and grounds (removed, cleaned and tightened): _____all last week_________
- Glow Plugs - how many miles on them? ___n/avail______ What type? ___n/avail__________
- Injectors - last changed at ___n/avail. Truck was maintained regularly at a dealer by a retired gent.____________
History: (Describe how the problem first appeared.)
- What were you doing when it happened? ____cruise on hwy__________
- How was the truck running fine before this problem appeared? ___no issues__________
- Has this problem ever happened before? ___not till that first time then recurring problem____________________
- Describe any related factors that might be part of the problem. ______________
- Have you checked for DTC (Diagnostic Trouble Codes)? (Y.N) _Y___ And? ___only self generated during diagnosis_____
Diagnostics:
1] Starting:
1a] Does the engine start? __starts fine_______
1b] Does the engine crank over? ____Y____
1c] Are your batteries fully charged? _____Y____
1d] Have you removed, cleaned, and tightened all battery connections? ______Y__
1e] Does your Wait to Start light come on for a time? How long? __abt 5 - 10 sec_______
1f] Does your glow plug light come on? _________ For how long? _________
1g] Do you see smoke from the exhaust while cranking? What color? __N______
1h] Does the Service Engine Light Glow during Start/bulb check? ___Y_____
2] Fuel Issues (if not running):
2a] Can you hear your lift pump working? __Y__________
2b] Do you get a steady flow of fuel from the water drain (T-handle) ? Y
2c] Loosen the inlet line from the IP – is fuel coming out (Lift Pump on)? ____Y_______
2d] Loosen an injector line and crank the engine - does fuel come out? __Y_______
2e] Do you hear a vacuum (hiss) when you remove the fuel cap? ______N_____
3] PMD / IP Issues
3a] Location of PMD (on pump, on intake, remote mounted) _Intake manifold__________
3b] Condition of Extension harness (if used) Vendor or Homemade? ___V______
3c] Condition of grounds / ground wires to IP / PMD. Check Harness. ___OK______
3d] PMD Make: __Heath_________
3e] PMD Age: ___Unknown__________
4] Stalling Issues NONE
4a] Do you experience stalling only when hot? ____________
4b] Does it stall under particular circumstances? (ie hit bump, or on accel) ______
4c] Does pouring cool water over the IP seem to help with restarting? _________
4d] Is stalling momentary (engine recovers)? _________
4e] Does SES light come on when engine hiccups? _________
4f] Does cruise control quit working when engine hiccups? ___________
4g] Does re-starting seem to reset engine, restoring cruise and power? _________
4h] Changes to dash lights or instruments during stalling events? ___________
5] Running Issues NONE
5a] On cold start, does upper rad hose get hard before engine warms up? _______
5b] Any bubbles or oil film in coolant overflow tank? _______
5c] Any white slime on oil surfaces (dipstick, CDR, oil Fill cap)? __________
5d] Excessive white smoke from exhaust on cold start? _________
5e] Excessive black smoke from exhaust under hard acceleration? __________
6] Performance Issues
6a] Do you have gauges (boost, EGT) ? ____N______
6b] Maximum boost under load? ____________
6c] Have you added a performance PCM (reflash) or Chip? ______________
6d] Have you changed exhaust / downpipe / crossover? ________________
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? _Flushed @185000km_________
7d] Have you replaced the fan clutch? Manufacturer of replacement? __N______
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.
Thanks for any help you can pass on. vbpeder
Last edited by a moderator:
)Your truck will like you for it. If you NEED to have the EGR to pass emmsions you can actually cut the bottom off it and bolt it to the F intake as if it was supposed to be there. There is a place for it to go. I'll see if I can dig up pics from my old Tahoe.
