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Rb25det Dies After Starting

eddieneedsboost

By eddieneedsboost,
in Engines & Forced Induction

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eddieneedsboost Collaborator

eddieneedsboost

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Posted (edited)

Hey guys, was cruising along the highway the other day and the 'overheating cat' light came on and the engine died. Pulled over and the car would start, get to 1000~ rpm and then die again. Pressing the accelerator before it dies does nothing. After unplugging and replugging the 02 sensor wire on the dump pipe the car started fine.

The next day I had the same problem but playing with the 02 sensor plug doesn't fix it. Getting a new 02 sensor tomorrow hoping that does the trick.

Would a stuffed 02 sensor cause this problem? I thought it would just cause poor fuel economy, not cause the car to not run at all.

Car is a rb25det r32 with only mods being a tuned power fc and walbro fuel pump.

Cheers.

Edited by eddieneedsboost
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https://www.sau.com.au/forums/topic/288869-rb25det-dies-after-starting/
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femno Grand Master

femno

Posted
Posted

I think the fact you fiddled with the 02 sensor and then it started is coincidence. No it cant cause this problem unless there is a short of some sort.

Check your Air Flow Metre. They sometimes give the problem you describe.

Also, check to see if 02 feedback is switched ON on your PowerFC, (ETC > Function select. Check PFC FAQ on here) you could be replacing it for nothing. If its OFF then leave it and dont replace it because it isnt doing anything, dont switch it ON either. If it is ON then you can replace it if you want to.

brentos Community Regular

brentos

Posted
Posted

don't know if this is any help but on my 33 it was idling to around 100rpm then just stalling. Got my dad to have a look at it and it turned out the cable coming from the O2 sensor had melted as it was resting on motor or exhaust manifold and that popped a fuse somewhere. My old man replaced the fuse (dont ask me where it was i wasn't with him at the time) and it worked fine ever since.

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