Simon_CSK Posted October 23, 2021 Share Posted October 23, 2021 The story of my P38 goes like this. In July 2019 I took it to be Valleted and when I got it back all hell had broken loose as they had flooded the BECM. Finally got the BECM rebuilt and installed in January but it wouldn't start so assumed that there was an issue with the ECU not talking to the BECM. Finally got that checked on Wednesday and we discovered that the cut off had tripped and the fuel pump had failed probably because it had been sitting for so long. Today I had the tank out and changed the fuel pump but there now isn't a spark. What do I need to check and in what order? (have been playing with TDV8's for too long and have forgotten how my P38 works. Quote Link to comment Share on other sites More sharing options...
Escape Posted October 24, 2021 Share Posted October 24, 2021 Are you sure the BECM and engine ECU are in sync? In a Bosch the immobiliser allows the starter to crank bus disables the coils and injectors. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted October 24, 2021 Author Share Posted October 24, 2021 14 minutes ago, Escape said: Are you sure the BECM and engine ECU are in sync? In a Bosch the immobiliser allows the starter to crank bus disables the coils and injectors. Yes Local indy confirmed it on Wednesday. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 24, 2021 Share Posted October 24, 2021 Assuming happy ECU's and working coil packs - crank sensor would stop it seeing any RPMs, and it may or may not need to see the cam sensor too. Quote Link to comment Share on other sites More sharing options...
Escape Posted October 25, 2021 Share Posted October 25, 2021 Camsensor shouldn't be a problem, they can run without and probably not even noticeable. CKP is a definite possibility. In that case you'd get no rpm reading (either on the dash or in the ECU data) when cranking. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted October 25, 2021 Author Share Posted October 25, 2021 9 hours ago, Escape said: Camsensor shouldn't be a problem, they can run without and probably not even noticeable. CKP is a definite possibility. In that case you'd get no rpm reading (either on the dash or in the ECU data) when cranking. Crank case positioning sensor? How can I test it? Quote Link to comment Share on other sites More sharing options...
Escape Posted October 25, 2021 Share Posted October 25, 2021 Yes, the crankshaft position sensor. If it has failed (completely), you wont see the tacho move when trying to start. Or get an rpm reading from the ECU when connecting diagnostics. Have a look at fuse 28 and relay 23 just to eliminate the obvious causes as well. 1 Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted October 25, 2021 Author Share Posted October 25, 2021 1 hour ago, Escape said: Yes, the crankshaft position sensor. If it has failed (completely), you wont see the tacho move when trying to start. Or get an rpm reading from the ECU when connecting diagnostics. Have a look at fuse 28 and relay 23 just to eliminate the obvious causes as well. Thanks will have a look tomorrow. Hopefully not raining. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted October 26, 2021 Author Share Posted October 26, 2021 Tachometer not moving on cranking. Quote Link to comment Share on other sites More sharing options...
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