Requiemk Posted October 18, 2009 Share Posted October 18, 2009 My car has no injection pulse, rb25det. It been of the road for a month or so getting a few alterations and now it wont start, no injection pulse. Anyone have ideas on what could be the cause of this? I extended the engine loom in places including the cam angle sensor wiring which is only piece of input the ecu needs to initiate injection pulse. Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted October 18, 2009 Share Posted October 18, 2009 id say check everything you changed, ie the wiring, is correct. the polaraty, joints, sheilding etc.... also the ecu earths Quote Link to comment Share on other sites More sharing options...
l1ttle_d3vil Posted October 18, 2009 Share Posted October 18, 2009 including the cam angle sensor wiring maybe the ecu doesn't realise the engine is turning over now? mine wouldn't fire the injectors / coil a while back because the ecu wasn't receiving signal from the dizzy, was showing engine speed as 0. and check all your earths. fit more for good measure, especially from block to chassis. Quote Link to comment Share on other sites More sharing options...
Requiemk Posted October 18, 2009 Author Share Posted October 18, 2009 cas wiring is fine, ecu is receiving both signals for rpm and engine position. Have went over earth's tonight but to no success I am getting spark so everything needed for ecu to run is there. no fault codes either. i have went over wiring i have extended but alot of it has nothing to with circuit and runs regardless of whether they are plugged in Quote Link to comment Share on other sites More sharing options...
l1ttle_d3vil Posted October 18, 2009 Share Posted October 18, 2009 i assume you've checked one side of the injector plug has 12v with the ign on? you haven't accidently hooked a power wire up to a wire that loses power when you turn to start? ive seen that done with a fuel pump before Quote Link to comment Share on other sites More sharing options...
Requiemk Posted October 18, 2009 Author Share Posted October 18, 2009 yer both sides of each injector have a 9v supply which is there Quote Link to comment Share on other sites More sharing options...
Requiemk Posted October 21, 2009 Author Share Posted October 21, 2009 Have put new ecu and loom in still same problem. All earths been cleaned up and checked. any ideas at all? oddball cases etc. electrician had no ideas but to busy to look at the moment Quote Link to comment Share on other sites More sharing options...
eke_zetec_RWD Posted October 22, 2009 Share Posted October 22, 2009 have you tryed spraying fuel manually to see if it fires? check the output with a scope. also why only 9 volts? usually 12...... Quote Link to comment Share on other sites More sharing options...
l1ttle_d3vil Posted October 22, 2009 Share Posted October 22, 2009 also why only 9 volts? usually 12...... i wondered that too, but i stopped there. what voltage is there when you're cranking? most ecu's need atleast 5 or 6v to power everything while cranking so if its dropping too low might cause problems. try hook a jump start pack up to make sure you got plenty of power... otherwise must be a faulty earth or sensor if the ecu and loom have been replaced. how do you know there is no injector pulse? did you check it with an LED or you just know the injectors aren't firing because fuel isnt getting in? Quote Link to comment Share on other sites More sharing options...
Requiemk Posted October 22, 2009 Author Share Posted October 22, 2009 Its all fixed now I tested via a noid light as well as a chopped up manifold to visually check the fuel injectors firing into the air. Turns out it was a faulty engine cont main fuse 30A which was half broken but still made contact on occasion. I replaced it with piece of crimped wire for short term and noticed it starting to smoke, i had a short to earth halfway into my body loom where i haven't even touched. very average. I have had this fuel injection problem in the past but it cured itself haha so i just left it as it no longer any problem. I find it weird this fuse wasn't mentioned as a vital part in the circuit in the engine manual or any website i looked at and that i would still get spark Everything is all back together and engine running, good times Quote Link to comment Share on other sites More sharing options...
Steelies Posted October 22, 2009 Share Posted October 22, 2009 this is the skyline you were working on when we popped in to get prince harry's diff? Quote Link to comment Share on other sites More sharing options...
Requiemk Posted October 22, 2009 Author Share Posted October 22, 2009 Sure is, bodykit isn't keen on leaving my driveway, alternations are needed hopefully wont affect "drifta look" to much Quote Link to comment Share on other sites More sharing options...
Steelies Posted October 22, 2009 Share Posted October 22, 2009 sweet. dude alter the driveway not the car. priorities 'twas quite funny parking two wagons on someones property before texting you to find out we had the right number and wrong street haha Quote Link to comment Share on other sites More sharing options...
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