Rb25 Conversion No Spark

[chester_fb]

hey guys im doing an RB25 Conversion on my HR31 Gts-x

so ive wired everything up, I went to check spark, and there was nothing there.

I thought this was wierd so i checked power to coils, they all had power

Then i took the CAS out and turned it by hand, IT SPARKED!

So it was sparking when i turned the CAS but not when i cranked the engine.

So then i thought the exhaust dowel must have snapped off, so i looked at that, and no it hadnt snapped off, i even compared the size of the dowel to the redtop RB20 i have sitting here, and they were both exactly the same!

So now im confused as to why it sparks by hand, but wont spark when the engine is cranked.

One more thing, when i got the wiring loom it was missing the CAS plug, so i used one out of an RB20 by matching the wire colours using wiring diagrams, so i thought i might have got something wrong? but still doesnt explain why it would spark by hand and not when cranked

any help would be much appreciated guys as at this point i have run out of ideas

cheers guys

Chester

[blown-vp]

hey guys im doing an RB25 Conversion on my HR31 Gts-x

so ive wired everything up, I went to check spark, and there was nothing there.

I thought this was wierd so i checked power to coils, they all had power

Then i took the CAS out and turned it by hand, IT SPARKED!

So it was sparking when i turned the CAS but not when i cranked the engine.

So then i thought the exhaust dowel must have snapped off, so i looked at that, and no it hadnt snapped off, i even compared the size of the dowel to the redtop RB20 i have sitting here, and they were both exactly the same!

So now im confused as to why it sparks by hand, but wont spark when the engine is cranked.

One more thing, when i got the wiring loom it was missing the CAS plug, so i used one out of an RB20 by matching the wire colours using wiring diagrams, so i thought i might have got something wrong? but still doesnt explain why it would spark by hand and not when cranked

any help would be much appreciated guys as at this point i have run out of ideas

cheers guys

Chester

snapped cam belt.

check to see if you have +12 to coils and crank angle sensor when you crank you could be looseing ignition +12 when you crank engine over.cheers darren.

Edited May 26, 2009 by blown-vp

[chester_fb]

cheers mate, its not a snapped cam belt ive got the cam belt cover off

when i crank the volts at the coil go from 11.98 down to 0.19V looks like we have a problem

[blind_elk]

Check volts at the ECU - they need at least about 7V to stay alive.

[chester_fb]

got it all sorted now thanks for the help guys

SHE RUNS