Hey dave what brand of CPS did you install ??was it a BWD brand ?? if so remove it from the truck and get your money back and get a AC/Delco brand or a Napa CPS I had a bad experience earlier this year with BWD they arent up to snuff so to speak I installed a Napa brand in my 6.5 and I never have looked back hope this helps

 

I don't frequent here much as I do the truck stop (actually almost never) to know where timing is you need a bi-directional scan tool to read/change timing I use the old MT2500 scan tool.

What yr truck as OBD-I is different from OBD-II ko-ko learn is not available on OBD-I I & a few others made a detailed diagnostic guide at TTS I won't hot link to as I'm not trying to steal thunder from this site.

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6.5 Engine Diagnostic Troubleshooting Checklist


Copy and paste this checklist into a new post, then answer all the questions by typing in your data into the (red) blanks as indicated - click in the middle of the blank, start typing.


Problem: Explain your problem in concise language (ie: Cranks but won’t fire). ____________________________

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

- Year: ______
- Truck model and class (ie: c2500) _________
- Automatic or Standard __________
- Mileage: (indicate miles or km) _________
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc) ___________
- Model: ‘S’ or ‘F’ engine, NA or Turbo, EGR? ______________
- Ambient outside temp: (indicate *C or *F) __________
- What fuel are you using? (#1 Diesel, #2 Diesel, Bio, VO, WVO, etc) _________
- What fuel additives are you using? ___________
- Where are you located? _____________

General maintenance: inspect and evaluate the condition of each. When were they last changed?
- Air filter _________
- Fuel filter _________
- 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? ______________
- How was the truck running fine before this problem appeared? _____________
- Has this problem ever happened before? _______________________
- Describe any related factors that might be part of the problem. ______________
- Have you checked for DTC (Diagnostic Trouble Codes)? (Y.N) ____ And? ________


Diagnostics:

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

2] Fuel Issues (if not running):
2a] Can you hear your lift pump working? ____________
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? ___________

3] PMD / IP Issues
3a] Location of PMD (on pump, on intake, remote mounted) ___________
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? ____________
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
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) ? ___________
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)? ______________

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.

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IP gear or the 3 IP housing external bolts, neither of which singly being loose would cause of timing setting loss. Incorrect time setting could be an issue following IP swap if shop did not know what they were doing, I see from my last post yours is a 96 OBD-II so ko-ko is way to start the leran if ECT is above 170F and you have no stored codes in the PCM, any those are the permissives to enable a ko-ko.

That in itself may be a good thing because if you did not get ko-ko activated then you are running on the stored timing values of last IP which is fine so long as replscement IP was installed reasonably close to where old one removed was.

You said engine ran away ??? Several fail modes could maybe cause it most common of which is broken fuel solenoid armature in the IP. You said in previous diagnostics shop tried a new IP ?? did they leave it on, was it a new IP or a "used but supposedly good IP".

Could be PMD related but runaway with those not common, also rarer still is bad APP module asking for max fuel, when PMD & APP go bad you usually ge a no/erratic start (PMD)or a limped max fuel (APP).

Have you been through the entire gnd system diagnostics more than just the battery gnd, multiple gnds to notice, I cant copy paste the file from TTS it simply is too large to inport, reason I aske you are showing high IAT & other sensor issues that fault when gnds are dirty, may not be the whole proble but need to be eliminated to have best trouble shooting success. IM TD over at TTS as well.

The one that really causes most oddball readings is pass side rear head intake manifold stud, the gnds there go to the PCM those get dirty and all sorts of weird stuff happens, like no start, I've not seen a runaway from that gnd being dirty since playing in Jurassic Park dinosaur diesel land in 2000 when I got my 1st one; but who knows, trons are a funny thing sometimes

 

Thanks for the replies.

Mayhem, the part I used is a Flight Systems piece from Pensacola Diesel.

TD, I did get the KOKO activated. TDC offset was originally at 0.0, I activated KOKO relearn, ECT was approx 180, cleared DTCs. P1214 set, TDCO went to +2.49 as read by the snap-on verus.

It's unknown whether the IP was a "known good" or brand new. All I know is that they tried a different one, and when that didn't solve the problem, they put the old one back on.

I'll head over to TTS and look for the ground diagnostics list, I think I've seen it before. I'll also fill out the troubleshooting checklist.

Thanks again, guys!

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Problem: Explain your problem in concise language (ie: Cranks but won’t fire). Surging idle, occasional stalling, occasional WOT

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

- Year: 1996
- Truck model and class (ie: c2500) Tahoe
- Automatic or Standard Auto
- Mileage: (indicate miles or km) 184k miles
- Replaced parts and mods (IP, PMD, chip/PCM, TM, injectors etc)PMD w/ cooler, new crank sensor, previous owner had shop try new IP, replaced turbo with another unknown mileage used one
- Model: ‘S’ or ‘F’ engine, NA or Turbo, EGR? "F", Turbo, w/ EGR
- Ambient outside temp: (indicate *C or *F) 70-80 *F
- What fuel are you using? (#1 Diesel, #2 Diesel, Bio, VO, WVO, etc)#2 Diesel
- What fuel additives are you using? Power Service
- Where are you located? southeast PA

General maintenance: inspect and evaluate the condition of each. When were they last changed?
- Air filter Good condition
- Fuel filter Replaced
- CDR Valve? old, leaking oil
- Coolant – last flushed/replaced at unknown
- Oil – synthetic/regular, changed at regular, 0 miles ago
- Batteries – state of charge, (matched set) replaced at Brand New, replaced 2 days ago, matched
- Battery cables and grounds (removed, cleaned and tightened):Cables clean and tight, going to check grounds
- Glow Plugs - how many miles on them? unknown What type? Bosch Duraterms ready to go in
- Injectors - last changed at unknown


History: (Describe how the problem first appeared.)
- What were you doing when it happened? Unknown
- How was the truck running fine before this problem appeared? Unknown
- Has this problem ever happened before? Unknown
- Describe any related factors that might be part of the problem. Unknown
- Have you checked for DTC (Diagnostic Trouble Codes)? (Y.N) YAnd? Primarily P1214


Diagnostics:

1] Starting:
1a] Does the engine start? Y
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? Y, 5 seconds or so
1f] Does your glow plug light come on? Not sureFor how long? _________
1g] Do you see smoke from the exhaust while cranking? What color? Y, white/light gray
1h] Does the Service Engine Light Glow during Start/bulb check? Y



3] PMD / IP Issues
3a] Location of PMD (on pump, on intake, remote mounted) remote mounted
3b] Condition of Extension harness (if used) Vendor or Homemade? Brand new, vendor
3c] Condition of grounds / ground wires to IP / PMD. Check Harness. appears good, checking
3d] PMD Make: Flight Systems from Pensacola Diesel
3e] PMD Age: Brand New

4] Stalling Issues
4a] Do you experience stalling only when hot? N
4b] Does it stall under particular circumstances? (ie hit bump, or on accel) N
4c] Does pouring cool water over the IP seem to help with restarting? restarts right away without trouble
4d] Is stalling momentary (engine recovers)? N
4e] Does SES light come on when engine hiccups? N
4f] Does cruise control quit working when engine hiccups? unknown
4g] Does re-starting seem to reset engine, restoring cruise and power? unknown
4h] Changes to dash lights or instruments during stalling events? unknown

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

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? N
6d] Have you changed exhaust / downpipe / crossover? N
6e] Wastegate – mechanical or vacuum (OEM)? vacuum, OEM


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.

 

+2.49 is why you have the code problem thathat is full scale retarded timing -.25 to -.75 is the factory timing spec -1.5 to -1.95 is wher you go for a little more advanced timing/performance we can discuss more when you call. Also if using a Snap On Versus tool I'm not sure if the TDCO display is accurate I've never used that one, my MT2500 also wonky in the TDCO # displayed but I compared it vs a GM Tech II so I know what the error offset is when using the MT2500 vs GM Tech II.