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Rb25 In 32 Running Probs. Ignition Cuts Out After A While

45ULT

By 45ULT,
in Engines & Forced Induction

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45ULT Rising Star

45ULT

Posted
Posted (edited)

i put a rb25det in my r32 with the standard r33 25 loom and computer. its been running fine for a while now until yesterday. i washed the car and on the way home the tacho dropped to 0 and car died. i let it sit for a while and it started again. it runs for a period of time and then as if something gets too hot and stops working. i've swapped several things including CAS, ECU, ignitor,

when car won't start it cranks and injectors fire and theres fuel. if u spin the cas the injectors fire but no coils. it did get water in the wiring loom and that has all been cleaned out. i have checked all the wires to and from the cas. it gets battery voltage and earth. both signal wires are outputting signal when it cranks without starting.

any ideas would be great cause im out of em!

Edited by 45ULT
BHDave Grand Master

BHDave

Posted
Posted

when it's dead confirm that you are getting power to the coils. You've swapped ignitors so thats ruled out, check the eccs and ign relays, though it's more than likely the ign one if you still have injectors firing.

the tacho dropping to nothing has me beat as it's based on the ecu output which i assume comes from the cas signal. I've had it happen in an old single coil setup before when the pick up died, but i don't know how it would cross over into a more modern setup.

xionofchaos Contributor

xionofchaos

Posted
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yeah forgot to mention that i've swapped the ignition relay with the other blue one next to it. which i presume is the ECCS one. no difference

I'm not a car guru, but I have had a similiar issue after washing out the engine bay of my R33. I managed to get water into the wiring loom. It caused the coils to short out and start arc'ing. The water causes the spark to arc into the block rather than arcing through the spark plug gap.

I started my R33 while the coils were wet and she started mis-firing something really really bad. I left the car out in the sun with the bonnet up for a few hours and it was improved. She only started mis-firing after 4000 rpm. It took a while but she dried out and was working fine after that. It could be that you have the same issues. Either that or you have water causing a short circuit in your wiring loom.

Hope this helps

Jmaac Proficient

Jmaac

Posted
Posted

Sounds like the ignition module. Everything will test ok, but the car will usually die when it gets hot or it wont start after driving until its cooled. Pretty common in older RB motors apparently

45ULT Rising Star

45ULT

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thanks for all your help guys. i have solved the problem.. it was the coolant temp sensor for the ecu. i pin pointed it by unplugging it when it would not start. the car then fired although extremely rough due to it running rich from the substitute value. i then tried another sensor i had from my spare engine. it has not missed a beat since sunday nite.

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