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Car Will Not Start.

Daboss

By Daboss,
in Engines & Forced Induction

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Daboss Experienced

Daboss

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Hey forum I am having a problem starting my car and wanted to get some other advice on it. I have an rb25det with the series two engine so no ignitor module. Mods that might affect startup are are pfc, z32 afm set in pfc, nismo 555 also set in pfc, q45 throttle body and brand new super spark coil packs. Here is the problem as I try to roll the car over it cranks but just will not start. I have power to the injectors and fuel pressure. Do not know if fuel is being delivered as I didn't remove any hoses but can smell the vapors as I try to crank. I checked the power to coil packs but got nothing. I wanted to know if at ignition on should there be a constant hot to the coil pack loom? Cause I turned the ignition to on and checked every wire coming from ecu loom to coil pack and none had voltage. I also did the check in the manual for continuity between certain ignition wiring and got nothing. So I was just wondering are there any other checks I can do to the ignition system to prove this is what is wrong?

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Daboss Experienced

Daboss

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what did you last change

when did it last start ok

I changed everything. Last started ok before rebuild. Did a complete rebuild. Put on new intake, new exhaust, new injectors, new computer, different harness, different turbo and throttle body. Everything else is ok by my test throttle body .4 volts at ignition, injectors have a constant hot and pulse when cranking the car, have fuel pressure all lines are installed correctly and can smell vapours when cranking didnt remove any fuel lines, but I think those fuel checks were enough. Only problem is at ignition on can't find a hot on coilpack plug from ecu. Thats why I think I have narrowed it down to ignition, and was wondering if when ignition on should you have a constant hot to one of the wires from ecu loom to coil pack loom. During sensor check on pfc got throttle voltage and 3.54 volts on wtb something.

BahamaSky Apprentice

BahamaSky

Posted
Posted
I changed everything. Last started ok before rebuild. Did a complete rebuild. Put on new intake, new exhaust, new injectors, new computer, different harness, different turbo and throttle body. Everything else is ok by my test throttle body .4 volts at ignition, injectors have a constant hot and pulse when cranking the car, have fuel pressure all lines are installed correctly and can smell vapours when cranking didnt remove any fuel lines, but I think those fuel checks were enough. Only problem is at ignition on can't find a hot on coilpack plug from ecu. Thats why I think I have narrowed it down to ignition, and was wondering if when ignition on should you have a constant hot to one of the wires from ecu loom to coil pack loom. During sensor check on pfc got throttle voltage and 3.54 volts on wtb something.

Da Boss, please put your stock or any other injectors in and change those yellow foolishness. I told you they are no good. Trust me on that. Once you do that you will be fine.

Sparta!

Daboss Experienced

Daboss

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Da Boss, please put your stock or any other injectors in and change those yellow foolishness. I told you they are no good. Trust me on that. Once you do that you will be fine.

Sparta!

Lol, I hear ya. The yellow foolishness good though they got stuck from just sitting up there, had emm flow tested an freed they all good now. So Any other ideas, Mr Sky, I tired a catching ride now and these sr20 guys running the streets now, "So I heard.", and skyline fellows demolishing the cars. I have it narrowed down to ignition cause when cranking I get no power aor signal at the plug that comes from the ecu. I think that part a the harness is fried.

BahamaSky Apprentice

BahamaSky

Posted
Posted
Lol, I hear ya. The yellow foolishness good though they got stuck from just sitting up there, had emm flow tested an freed they all good now. So Any other ideas, Mr Sky, I tired a catching ride now and these sr20 guys running the streets now, "So I heard.", and skyline fellows demolishing the cars. I have it narrowed down to ignition cause when cranking I get no power aor signal at the plug that comes from the ecu. I think that part a the harness is fried.

i was having the same simptoms as what you are explaining, try different injectors first and see how it goes.

Daboss Experienced

Daboss

Posted
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Hey there forum, need to ask another quick question found out that the wire harness I am using is from an automatic skyline and mines is a manual. Was told if I am using a manual transmission with this automatic harness I will have no ignition. Do you think that is the reason I am getting no ignition? If so what do I have to rewire in order to get ignition.

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

yeah because different injectors will stop power going to the ignition coils :)

there is 3 wires into the ignition coil.

one will be thicker. this should be the ignition power.

you should be able to check the other 2 colour and see 6 of them that match at the ecu(loom)

these should have pulses when cranking, but you can only check with a led test light.

if there is no power to any of these wires when ignition on then there is your problem. get a multi meter and see if the thick ones all have continuity to each other. if they do and theres no power, try tapping into one of the thick wires and put a temporary 12v feed straight from the battery, then try cranking it again. see if it starts

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