Rb20Det

[mitch t]

hey all i just bought a old mr30 skyline with a rb20det a few weeks ago. its a conversion with a supra gearbox t3 turbo with a big ass rear housing, front mount, external gate. boost tap, exhaust. its been driving fine untill up high no matter what the boost tap is set at the boost gauge is always pushing 14-16 psi and missfires. but last night i got in it turned the key the motor turns but wont start. i clutch started it and it ran fine then i turned the key off started it a minute later with the key it fired up, turned it back off waited ten minutes or so tried turning it again and wont start but the motor just keeps turning we checked the fuel line and im getting fuel past the fuel filter but beyond there i dont no. if anyone has any ideas on what it could be would greatly help im out of ideas. thanks all....

[mad082]

might be dodgy spark plugs or coilpacks.

[mitch t]

yea i thought it might have been that. i got a new plug today and tried it in every coil and got no spark at all. could be the igniter too maybe?

[StevenCJR31]

could be any of a hundred things, a good auto electrician can sort it for you

[mad082]

could be the ignitor, but most likely the crank angle sensor. if it is dodgy it won't register that the engine is turning over, so won't spark.

[mitch t]

i tested the crank angle sensor i just pulled it out and turned it myself with the car on the reds and it sparked fine. would u think maybe the little teeth are stripped and its not turning inside the motor. i also ran over everything with a multimeter and im gettn power not a problem or should i start looking at the injector side of the problem.

[Isola]

If you can clutch start it and it runs fine, then you're most likely not going to have a problem with anything to do with your fuel or air systems, so I wouldn't waste time on your injectors. If one or more wasn't firing then it'd be misfiring like a mad bastard.

Sounds like a problem somewhere in the ignition system. Maybe the starter has crapped out (or maybe not getting enough voltage) and it's not spinning strong enough to engage the fly properly? It might sound like the engine is turning over properly, but could be not turning over fast/hard enough to actually start.

Have you done a voltage check yet? I'd start there. Make sure everything is getting enough battery power on start up. If it's started itself after running for 10 mins or so, then maybe the alternator has put enough kick back into the battery for it to give the starter motor the right voltage (which would be why it didn't start again after a brief on/off then sitting for ten minutes) OR the heat/vibrations in the engine has made a better contact on the starter motor connections.

[mitch t]

very true. didnt think of that. will start looking into that region. let yas no how i go. cheers heaps dude.

[Isola]

Any luck with it?

[mitch t]

im looking towards the ignitor all 6 pins dont look too well theres black lines showing and when i fiddled with it the car kicked over and drove started 2 more times now hasnt started since. im trying to get it to the auto elecs but its a bit of a nightmare trying to get it there but hopefuly getting another 1 will solve the problem ?

[mitch t]

how would you test the igniter it self i put a multimeter over the plugs and everything is getting power sweet but i cant get a reading though the 6 pins on the igniter.

[mitch t]

got a auto elec coming to check it out next week so hopefully ill be spoolin again end of next week. fingers crossed.