Erratic Idle and rough running.

Nistune topics specific to the H8534/H8536 cpu

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nanook
Posts: 79
Joined: Tue Dec 30, 2008 2:42 pm
Location: Auckland, New Zealand

Erratic Idle and rough running.

Postby nanook » Thu Jun 12, 2014 7:33 pm

Ok this car has issues. Not long ago it idled and ran very smoothly

now most of the time it idles like crap, especially when cold it won't idle until you hold the revs for a few seconds and your lucky.

When you come to a stop it surges a bit like you pushing the gas, sometimes quickly stabilizes sometimes it takes longer. So before you can shift it into neutral its still trying to move the car as the revs go up and down.
When you shift from Drive to Neutral it drops revs and almost stalls sometimes (worst case).
From a cold start it struggles and needs a bit of gas most tmes for a few seconds or it will stall and sometimes still does..

Attached are 3 logs, one when everything was good and two showing injector spikes when its running like crap.
It does at brief times idle and run fine, just not for long.

Any ideas welcome.
Thankyou

Note: it turned out in this case to be the AAC Valve
Attachments
23710 - 29U10 MEC-R750 1997 ENR33.bin
(32 KiB) Downloaded 127 times
R33 1997 ENR33 23710 - 29U10 MEC-R750.rar
(72.21 KiB) Downloaded 101 times

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