Problem: Explain your problem in concise language (ie: Cranks but won’t fire). _will not shift from 3rd to 4th until warms up to apx 190 degrees___________________________
Demographics: tell us about your truck and your ambient conditions:
- Year: 1998______
- Truck model and class (ie: c2500) _GMC 3500________
- Automatic or Standard _automatic_________
- Mileage: (indicate miles or km) ___196000______
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc) PMD, TM, 3" EXHAUST, W/ONLY MUFFLER___________
- Model: ‘S’ or ‘F’ engine, NA or Turbo, EGR? ____F__________
- Ambient outside temp: (indicate *C or *F) _98 F_________
- What fuel are you using? (#1 Diesel, #2 Diesel, Bio, VO, WVO, etc) _#2 DIESEL________
- What fuel additives are you using? _NONE__________
- Where are you located? __TEXAS PANHANDLE FOR NOW___________
General maintenance: inspect and evaluate the condition of each. When were they last changed?
- Air filter ___less than 3 mths______
- Fuel filter ___less than 3 mths______
- CDR Valve? __haven't changed since purchase 2 yrs_______
- Coolant – last flushed/replaced at __3 mths___________
- Oil – synthetic/regular, changed at ___rotella________
- Batteries – state of charge, (matched set) replaced at __2yrs good condition___________
- Battery cables and grounds (removed, cleaned and tightened): __cleaned ____________
- 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 normal conditions_____________
- How was the truck running fine before this problem appeared? __only hint was rpm fluctuation of 100-200 on occasion before codes and shifting problem
_________
- Has this problem ever happened before? ____________no___________
- Describe any related factors that might be part of the problem. ____?__________
- Have you checked for DTC (Diagnostic Trouble Codes)? (Y.N) ___y_ And? __p-113 p-118 p236______
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? __apx 60 seconds_______
1f] Does your glow plug light come on? ___n______ For how long? _________
1g] Do you see smoke from the exhaust while cranking? What color? __light color______
1h] Does the Service Engine Light Glow during Start/bulb check? _____n___
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) ? ____?_____
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) __outside remote mounted_________
3b] Condition of Extension harness (if used) Vendor or Homemade? ___new vendor______
3c] Condition of grounds / ground wires to IP / PMD. Check Harness. __cleaned_______
3d] PMD Make: ____?_______
3e] PMD Age: ______new 1 month_______
4] Stalling Issues
4a] Do you experience stalling only when hot? ___no_________
4b] Does it stall under particular circumstances? (ie hit bump, or on accel) __no____
4c] Does pouring cool water over the IP seem to help with restarting? _?____?____
4d] Is stalling momentary (engine recovers)? ___no______
4e] Does SES light come on when engine hiccups? __no_______
4f] Does cruise control quit working when engine hiccups? ___no________
4g] Does re-starting seem to reset engine, restoring cruise and power? __?_______
4h] Changes to dash lights or instruments during stalling events? ______no_____
5] Running Issues
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)? __no________
5d] Excessive white smoke from exhaust on cold start? ____not a lot_____
5e] Excessive black smoke from exhaust under hard acceleration? __yes alot________
6] Performance Issues
6a] Do you have gauges (boost, EGT) ? ______boost_____
6b] Maximum boost under load? ______12-14______
6c] Have you added a performance PCM (reflash) or Chip? __no____________
6d] Have you changed exhaust / downpipe / crossover? ______same crossover 3" exhaust with only muffler__________
6e] Wastegate – mechanical or vacuum (OEM)? ____TM __________
7] Temperature-related Issues:
7a] Single or dual thermostats? _______?_____
7b] Have you replaced them lately? Manufacturer of replacements? __no_______
7c] Have you pulled and cleaned Radiator and coolers lately? ________no____
7d] Have you replaced the fan clutch? Manufacturer of replacement? ___no_____
7e] (winter) Have you tested your antifreeze? Good to what temp? ____?______
7f] (winter) Are you using a winter grille cover? ___no________
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
truck ran ok had vacum wastegate issues,, installed tm and 3" exhaust.. lots of power after,, ran like a beast..rpms started fluctuating 100-200 a few months ago..and then tranny started "not shifting into 4th until engine warm up to apx 190 degrees.. installed new pmd and extension cable in bumper, changed coolant sensor, switch, and iat snesor.
