Bs diesel Posted August 22, 2023 Share Posted August 22, 2023 hey guys ive got a 1998 CHR Vmac 2 with a E7 454 engine, truck is a salt field truck that has come into the workshop for a suspected electrical fault, engine will start to stall and then grab revs last minute before shutting off, then idle fine with no faults, or will stall all together and then when u try to start it again it will crank with no start. when it first came in battery's where dead, alternator belts where extremely loose and main battery earth cable was split. replaced battery's fixed earth cable, tightened up belt then checked DTC's only found three fault in system, ( fuel rack position sensor/ current below normal or open circuit, Fuel actuator/ current below normal or open circuit and Timing sensor/ data erratic, intermittent or incorrect). UPDATE : Checked the timing sensor tip looked to be ok just slight wear nothing crazy, will be ordering a new one tho due to cracked in half when removing due to rust from all the salt. Quote Link to comment https://www.bigmacktrucks.com/topic/73199-e7-454-1998-chr-random-shutdown-stall/ Share on other sites More sharing options...
Bs diesel Posted August 22, 2023 Author Share Posted August 22, 2023 I’ve gotta be careful with what parts I’m removing to diagnose this truck as due to working in the salt fields everything I’m touching is breaking. Quote Link to comment https://www.bigmacktrucks.com/topic/73199-e7-454-1998-chr-random-shutdown-stall/#findComment-537514 Share on other sites More sharing options...
fjh Posted August 22, 2023 Share Posted August 22, 2023 So try taking the fuel pump plug apart un plug it and re plug it a half dozen to one dozen times and see if this changes your situation if it does then you have two choices have the plug repined or hard wire the pump to the truck! It’s the bigger gray plug at the rear of the pump there! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73199-e7-454-1998-chr-random-shutdown-stall/#findComment-537522 Share on other sites More sharing options...
Bs diesel Posted August 22, 2023 Author Share Posted August 22, 2023 cheers dude gave it ago but no change found, and when ive checked the wiring in the plug its all sweet. Quote Link to comment https://www.bigmacktrucks.com/topic/73199-e7-454-1998-chr-random-shutdown-stall/#findComment-537524 Share on other sites More sharing options...
fjh Posted August 22, 2023 Share Posted August 22, 2023 Bummer a lot of the time this will give you a direction to go! I noticed that the sensor below that plug is damp! That is the timing event marker if you can get it to run again try wiggling those wires a see if this changes the issue that sensor should be dry . 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73199-e7-454-1998-chr-random-shutdown-stall/#findComment-537528 Share on other sites More sharing options...
Popular Post Bs diesel Posted August 24, 2023 Author Popular Post Share Posted August 24, 2023 hey man found out what was wrong the customer has had this truck at another shop for the same faults and what they did was cut all the wires at the ECU and ran 7 core trailer wiring out the LHS of the Cab firewall all the way to the pump, Bypassing the cab loom and engine harness, but what they did was they wired it up wrong at the pump side and ECU plug, finally found a wiring diagram and yeah found what they had done, so re-wired it all and put a new RPM/TDC sensor on and now she runs like a dream. 2 1 Quote Link to comment https://www.bigmacktrucks.com/topic/73199-e7-454-1998-chr-random-shutdown-stall/#findComment-537641 Share on other sites More sharing options...
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