I've just done a conversion from a UK 300zx TT manual (Gumball 3000's old car) to a NA SWB Convertible Auto, changed the engine, ECU, Boost controller, manual box etc, but the flippin thing won't start. Have done the auto box relay by-pass under the drivers footwell, did the ECU check (showed 55 - all good), removed the fuel pump fuse to check if there was a flood but no joy. Both cars were working fine before the conversion. I removed one of the spark plugs but not getting any spark although there is some voltage getting there. Engine is turning over & fuel pressure good, can any body help with what could be the issue with no spark at plugs? Almost bald from pulling my hair out so any help would be very much appreciated!!!!!!!!!!!

I suppose simple questions first

 

- has the alt belt been tightened up enough?

- has the battery got enough juice?

- PTU plugged in?

- Does the engine turn over?

- Removing the fuel pump fuse doesn't necessary release all fuel in the rail when cranking it, would be better to take the sparks out one by one and see if they are wet with fuel, if so leave them out for a bit then try again.

Thanks for replying, have a new battery, alternator good & tensioned, PTu is plugged in 9checked & re-checked), engine turns over, changed the spark plugs for new ones and also changed coilpacks just in case. Tried all variations & still no spark....

Is it getting fuel? If not it'll be the wiring to the CAS or the CAS itself I'd have thought mate - it controls injection and spark though so if your injectors are clicking away then its not the CAS causing the spark issue. Just a thought :)

Is it lack of spark on all plugs? or just the odd few, could be Coil pack related

The CAS is ok I think as ECU didn't register any faults, also changed out the coil packs. I'm going to test the PTU, it's somewhere in the electrical system. Just had a thought, the TT engine is a series 1 (1990), and the wiring loom is series 2 (1993)- is there a difference in the wiring for the PTU between the series? The connectors seem the same. Again, if anyone has any further ideas they'd be most appreciated!

Edited October 18, 201015 yr by Roy300zxTT

The CAS is ok I think as ECU didn't register any faults, also changed out the coil packs. I'm going to test the PTU, it's somewhere in the electrical system. Just had a thought, the TT engine is a series 1 (1990), and the wiring loom is series 2 (1993)- is there a difference in the wiring for the PTU between the series? The connectors seem the same. Again, if anyone has any further ideas they'd be most appreciated!

 

Well there is a series 1 and series 2 PTU so could be.-have you not got a S2Ptu to try?

Yup, will swap them over tomorrow & give it a try.

Changed the PTU and it started immediately!!!!!!!! Thank you everyone, am over the moon!

Does this mean my old widearch is no-more :confused1: