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View Full Version : KA24DE / Datsun 620 swap (new). Start issues.


620_Brian
08-18-2019, 12:23 PM
Hi all. First post. Long time lurker.
I’m posting this here because after a year of reading all the Ka/240 forums, this one seems to be the most knowledgeable and no nonsense.

Over the past year I’ve rebuilt a S14 (96) Ka24de and swapped it into a 79 Datsun KC pickup.
I have a new custom wiring specialties harness for this exact application, and a s14 ECM.
I can’t get it to start.
If I spray starting fluid it starts for about 3 seconds then dies.
I’ve triple checked the timing. I’ve even torn the front end off again and rechecked it. I put it at tdc on it compression using the finger in the hole trick.
The pulley mark is on 0deg the dizzy is pointing at #1. The first 2 cam lobes are pointing outwards. Just like all the diagrams and pics I’ve seen show.
Yes all 4 plugs spark nicely.
If it starts on fluid then the timing HAS to be correct yes?

I have a Walbro 255 fp, Tomei fpr set at 40psi, regular red ka injectors.
I’ve pulled the fuel rail and rigged up bottles. All 4 injectors spray pulse. A LOT btw.

It’s like the injectors are spraying at the wrong time so the plugs don’t have a nice atomized pattern to fire in. More like a wet puddle in the combustion chamber.

WHAT AM I MISSING?
Any suggestions?
Any help is greatly appreciated.

Brian in St Pete Fl.

Here’s some pics...

All lined up and in time tdc.

https://i.postimg.cc/CBhmWhrg/2-B56141-A-25-D0-4695-ADE9-422-D09-F0-E5-E9.jpg (https://postimg.cc/CBhmWhrg)

Fuel pump rig.

https://i.postimg.cc/Cn4rRZZd/447-C170-D-C5-E0-47-B1-88-F6-31-CA394-AF7-BC.jpg (https://postimg.cc/Cn4rRZZd)

Ecm mounted.

https://i.postimg.cc/5jMxQZYM/65-AB205-E-D4-E3-46-AE-9-B32-0-ADF648368-CC.jpg (https://postimg.cc/5jMxQZYM)

The truck in the shop.

https://i.postimg.cc/30p7VFbV/7-FA0-F404-C1-CE-4576-B0-BC-41-ACF82-FCAED.jpg (https://postimg.cc/30p7VFbV)

The motor installed.

https://i.postimg.cc/hhG2sG78/AFD43970-75-C2-492-A-9-E0-E-95-BCE992-BA28.jpg (https://postimg.cc/hhG2sG78)

Another timed tdc shot.

https://i.postimg.cc/ZBwVmGXy/F1-CB3750-867-C-4-CD1-8659-BA8-B903-DAE9-D.jpg (https://postimg.cc/ZBwVmGXy)