Section 20.3
Erratic Performance and No Codes
The following troubleshooting chart resolves erratic performance and no codes displayed. For troubleshooting procedures, refer to the appropriate engine service manual.
Section 20.3.1
Erratic Performance and No Codes
Check the following symptoms to determine possible fault, listed in Table "Troubleshooting Erratic Performance and No Code" .
|
Symptom |
Possible Fault |
|
Cannot get full power. |
Plugged fuel filters. Hose not connected to Turbo Boost Sensor. Verify injector calibration(s) are correct. |
|
Cannot get full throttle. |
Miscalibrated Throttle Position Sensor. |
|
Runs rough; misses and occasionally stalls. |
Improper gapping of Timing Reference and Synchronous Reference Sensor. Fuel leaks. Loose battery power, ignition or ground wires Injector failure. Vehicle speed sensor failure. Injector harness failure. |
|
Engine idles high after warm-up or hangs. |
Incorrect calibration of the Automotive Limiting Speed Governor (LSG/ALSG) linkage or pedal problem. VSG signal wire shorted to voltage source. |
|
Low road speed. |
Determine road speed specifications for vehicle manufacturer data. If road speed is less than specified and all mechanical checks are correct, then Cruise Control calibration is suspected. |
|
Vehicle surges or bucks. |
VSS may be supplying incorrect data to the ECM/ECU. |
| Series 60 DDEC V Troubleshooting Guide - 6SE570 |
| Generated on 10-13-2008 |
My DDEC 5 issue unresolved. Local Detroit shop rebuilt it, Detroit head office is involved. 29 months, 27 visits to Detroit shop.
Detroit trying, no bills to me as they,
Installed 5 turbos to date
Installed 2 VPOD’s
New EGR .
They loaned me shop laptop for diagnostics. I’d press ” snapshot ” when engine acted up & Detroit will now install VPOD #3 on Friday & new engine harness ( again, no charge)
Loaner ECM with other program tried, no change.
Feels like fuel starved and/or bad injector. After 8 hour’s runs great or after idle few hour’s runs great but only for 15 minutes or so.
Boost, barometric, synco sensors all changed.
Runs horrific when cold. Idle before trip start for 60 min plus & better not great. Not effected by rain, snow etc. Pressure test intercooler all good. Installed temp fuel supply and return lines ( draped over fuel tank to/from one tank ) no change.
Why after many hour’s all symptoms gone & runs great. Is warmer fuel causing pump and / or filter seals to swell / tighten up & not suck air , fuel pump stops cavitation? I don’t know !!
Batteries are relatively new, good clean cable and connections.
Alternator at spec ( all good) fuel tanks algae free inside. Sounds & feels so smooth and more responsive on the peddle after many hour’s trucking.
Has anyone any ideas ?
Great thanks !!
-Dan