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Rb20Det Problems

MrWindsurf

By MrWindsurf,
in Victoria

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MrWindsurf Experienced

MrWindsurf

Posted
Posted

Hi everyone,

My mate has an r32 gtst (auto) and its been playing up recently I was wondering if someone might know the problem.

Symptoms:

Irrattic Idle will be anywhere between 1600 and 400 it also stalls sometimes

The computer seems to be in limp mode when driving can't rev past 2500-3000, however you can free rev the car to redline no problems and sometimes

in 1st it will allow you to rev over 3000rpm its weird.

I checked the error codes on the computer and it did come up with 12 (MAF) but this could be because at one stage the car was running and I unplugged the AFM.

After it gave the error code of 12 I tried turning the car off (from on not started) again and then on to check the codes one more time and got 55 (no error) so we tried to

swap the afm over from my 32gtr but it seems to be a smaller diameter not sure why but yeah I'm assuming the reading would be different because of the size. So that

didn't really work

Maybe could I borrow someones AFM if they have time to check that is definetly not the problem.

Thanks in advance

Andrew.

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Psymon Mentor

Psymon

Posted
Posted

Hmmm so might be the o2 sensor ey, might be worth a look :) thanks for the advise.

The car should idle and run even with a stuffed o2 sensor. I drove mine for a week with the o2 sensor unplugged and the only difference I noticed was a slight increase in fuel consumption.

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MrWindsurf Experienced

MrWindsurf

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Yeah I have just been reading a thread about the o2 sensors so maybe I'll unplug it and see if anything different happens just to check. This is really annoying me and because its not my car I dont wanna go spending hundreds replaceing afms and o2 sensors if they are not the problems

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lukebaldan Collaborator

lukebaldan

Posted
Posted (edited)

The problem you describe sounds 100% like afm. I can replicate this problem by disconnecting the afm. I highly doubt it's the o2 sensor, you'll find your car should run fine without it albeit higher fuel consumption. You'll eventually get the check engine light 2 to 10 minutes after the car is started when the o2 is disconnected.

Edited by lukebaldan
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blind_elk Grand Master

blind_elk

Posted
Posted

I checked the error codes on the computer and it did come up with 12 (MAF) but this could be because at one stage the car was running and I unplugged the AFM.

Then reset the ECU and see what error codes come up.

Could be a sticking AAC valve causing the idle hunting.

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MrWindsurf Experienced

MrWindsurf

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Yeah I might give that a go tonight, reset the ecu then check for error codes again :-) Hopefully I get 12 again. If this is the case is there anyone who can come around and let me swap there one in to confirm that, that is the problem? I guess it would have to be from a gtst because the one from my gtr is a smaller diameter afm so i'm guessing it would send the wrong signals to the ecu.

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MrWindsurf Experienced

MrWindsurf

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Update: so I disconnected the battery to reset the ecu over night ... re-connected and tried to start the car all it does is crank over, doesn't even fire up :S so now I have nfi. If it was the AFM that was on the blink the car should still start right?

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MrWindsurf Experienced

MrWindsurf

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Another Update: Well seems that if i spray carbie cleaner into the throttle body the car will fire up on the fumes, which lead me to believe it was the fuel system. I found where it plugs into the fuel pressure reg and unplugged it before that, when i am cranking the car there is no fuel coming out of the lines. So either the fuel filter is blocked or the fuel pump is knackered. :( I think I might be getting somewhere now tho :)

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