KA swap no fuel or spark

General discussion forum about the 240sx, and a great place to introduce yourself to the board!
Nathyne
Posts: 59
Joined: Fri Apr 22, 2011 2:14 pm
Car: 1994 Skyline GTR
1983 Datsun 720 4x4 reg cab KA24E swap in the works

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No luck in the ka forum so thought i would try here since the engine going in my 720 is from a 240. Here is what I have so far:

roasted one ecu and wiring harness (fuel pump was running when truck was off and all sorts of weird stuff)

Replaced ecu and harness wired it the same and fuel pump runs as it should now (on for a bit until pressure is built)

Engine cranks
no fuel
no spark
i did put in a high pressure pump of course since ditching the carbed engine
ecu is throwing codes 11 (CAS) and 41 (intake temp sensor wasn't installed i hooked it back up)
checked grounds at distributer (forgot that one oops!), coil pack, and pretty much any grounds that I added. I grounded the engine, and the relays as required think of any that i missed? Here is the schematic i followed.

http://community.ratsun.net/topic/537-h ... 4b13e893d2

There are several wires that pass through the ecu connector and are not hooked up to any pins not too sure what these are for were not in the schematic to be used so i just capped them.

What do you think I should try next? any opinions are appreciated this is my first project like this so even if it's stupid simple still suggest it!

Thanks
Nathyne


Nathyne
Posts: 59
Joined: Fri Apr 22, 2011 2:14 pm
Car: 1994 Skyline GTR
1983 Datsun 720 4x4 reg cab KA24E swap in the works

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Did a bunch of research found out someone had a similar problem when the connectors were not plugged in in the passenger headlight area. Anyone know what these plug into? not sure if the relays I have setup bypass what ever it was and would be easier to find it in the wiring diagrams if I knew what they were plugged into.

Thanks
Nathyne

Also I know some wont start without the clutch pushed in does the 240 start without it in? I didn't wire anything to bypass that

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The_caveman
Posts: 283
Joined: Sat Aug 20, 2011 7:05 am
Car: 93 nissan 240sx hatch(daily build)
1992 Coupe (drift build)
1990 240sx hatch(wrecked slut)
2008 hyundai sonota - girls car/reliable! i drive it better tho ;)

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No on the clutch pedal question there is a switch on the back part of the pedal assembly and it should be plugged in... Not sure on the rest of it sounds like you got wiring mayham going on there and I would really have to be there in person. To be Any use

Nathyne
Posts: 59
Joined: Fri Apr 22, 2011 2:14 pm
Car: 1994 Skyline GTR
1983 Datsun 720 4x4 reg cab KA24E swap in the works

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Well I am pretty much out of ideas now.

Checked my wiring realized I didn't connect my cas and other sensors back to the relay just connected the pins did that still not starting
CAS code 11 is still there
voltage at connection a and continuity to ground at d
Coil pack is slightly out of spec 1.2 Ohms (should be .8-1.0) and 9995 Ohms (should be 10000) would this cause a no spark situation?
Don't have a friend near by to test if there is spark directly at the coil is there a way to check the voltages from the connector?
Even added a manual switch for the clutch/neutral switch hoping that would work but nope.
running out of ideas I need this truck running by Friday or else I need to buy a temp winter beater so any opinions would be great!

Nathyne
Posts: 59
Joined: Fri Apr 22, 2011 2:14 pm
Car: 1994 Skyline GTR
1983 Datsun 720 4x4 reg cab KA24E swap in the works

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I now have spark and pulses at the injectors. Still wont start the suspect is fuel pressure now. I am thinking possibly a clogged fuel line/bad fuel (the tank was full when i bought the truck no idea how old it is might just mount a fuel cell in the bed we will see). Would really stale gas cause the engine not to start? worried it may have clogged injectors and such I'll test the fuel pressure tomorrow ran out of daylight

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95zenki man
Posts: 1201
Joined: Mon Sep 13, 2010 11:38 am

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Nathyne wrote:I now have spark and pulses at the injectors. Still wont start the suspect is fuel pressure now. I am thinking possibly a clogged fuel line/bad fuel (the tank was full when i bought the truck no idea how old it is might just mount a fuel cell in the bed we will see). Would really stale gas cause the engine not to start? worried it may have clogged injectors and such I'll test the fuel pressure tomorrow ran out of daylight
Check your grounds. you might have f-ed your injs up to if you didnt put them in right or had stating problems and old gas got into them.

Nathyne
Posts: 59
Joined: Fri Apr 22, 2011 2:14 pm
Car: 1994 Skyline GTR
1983 Datsun 720 4x4 reg cab KA24E swap in the works

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Injectors were never removed. fuel pressure is at 90psi (before regulator) and gas coming from the gauge is clean (not that junk would fit through it). Grounds are good (grounded through the ecu and getting pulses when trying to start). Ecu no longer has any codes flashing 55 (all ok). The truck did start up with the old z22 engine with this gas 6 months ago. I will drain it next and refill with new gas I think. Also will it start with OEM GTR injectors if mine are f*** from the old gas? I know it will most likely run rich from the higher ccs but I have some laying around from when i upgraded my R32s I'll search some about it I think. Running out of ideas again.

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95zenki man
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Joined: Mon Sep 13, 2010 11:38 am

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Should be ok you will run rich but thats not a big deal...

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JacSmyth
Posts: 18
Joined: Sat Aug 13, 2011 8:41 pm
Car: 1991 Nissan 240SX - 1995 KA24DE - 5 Speed
1981 VW Rabbit Pick-Up - 1.6 Diesel - 5 speed
Location: Miramar, San Diego, CA.

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I wouldn't think that your injectors would be clogged if it hasn't ran with the new engine in your truck. have you checked the pressure after the regulators yet?

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The_caveman
Posts: 283
Joined: Sat Aug 20, 2011 7:05 am
Car: 93 nissan 240sx hatch(daily build)
1992 Coupe (drift build)
1990 240sx hatch(wrecked slut)
2008 hyundai sonota - girls car/reliable! i drive it better tho ;)

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He did it says it up there somewhere^^^^^

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95zenki man
Posts: 1201
Joined: Mon Sep 13, 2010 11:38 am

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Im having a tricky time figuring this one out without being there to look at it and test a few things. Any word on if the new inj's help at all?

Nathyne
Posts: 59
Joined: Fri Apr 22, 2011 2:14 pm
Car: 1994 Skyline GTR
1983 Datsun 720 4x4 reg cab KA24E swap in the works

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Success! it's alive. Wasn't bad gas. I assumed that the feeding fuel line should have gone to the regulator before the fuel rail. I was wrong goes fuel rail and the regulator bleeds off excess pressure :) Should have researched instead of assuming so really it was 3 different reasons this bugger wouldn't start haha. I may make a wiring diagram for idiots for a ka swap I sure could have used one... not really relevant to this forum but thanks for the suggestions everyone!


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