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Rough start, and rough idle when warm

thenixtone
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thenixtone Contributor

thenixtone

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Hey guys,

 

Sometimes when I start my R34 GTT (98, NEO) it sounds like its stuttering or spluttering, but it starts each time. Then when it gets warm and I'm sitting at lights or just idling, the revs will go up and down and low enough sometimes to almost stall (but it hasn't yet). I have no idea what this could be, I purchased a new Z32 AFM and installed it, but the car ran like shit as I'm guessing it needs to be tuned for the new one (so I put the old one back in).

 

Help is appreciated :D 

GTSBoy Grand Master

GTSBoy

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Posted

Yes, well, you can't run a Z32 AFM against a standard ECU without Nistune, correct.

I would suggest that your IACV would be dirty/sticky/blocked, hence the engine's inability to control revs. But all the roughness could be just about anything. AFM (dying, dirty, broken solder joints), CAS (same), injectors (dirty, broken loom plugs/pins), coils (same).  The list goes on.

thenixtone Contributor

thenixtone

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When I got the car looked at by a mechanic (it had a check engine light) they said the light was from the throttle actuator or o2 sensor. I'm guessing this is related, but what does that mean / what would be the fix? Sheesh

 

The car also idles at 1100 rpm

Edited by thenixtone
thenixtone Contributor

thenixtone

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8 hours ago, KiwiRS4T said:

You can install it yourself with a little effort:

http://www.kudosmotorsports.com/catalog/lambda-oxygen-sensor-suit-nissan-skyline-25gt-25gt-25gt-rb25de-rb25det-p-187.html

Link is dead, and the official Nissan mechanic wasn't sure either, he also said 'a retune will probably fix the issue' but I don't think that's true

Edited by thenixtone

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