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recently converted my patrol to efi and had nothing but issues

its stumbling when revving off idle and poping through the intake I have replaced

fuel pump walbro 255lph in tank

spark plugs and gapped to 1.1

dizzy cap

afm

tps

aac valve

fpr

coolant temp sensor

intake manifold gaskets

put a kit through the injectors and replaced all the seals

timing is set to 15c btdc +2

every now and then it comes good

if I block my return line it revs normal

sometimes it decides to run rich for no reason

any ideas guys

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Clean up or replace all the sensor plugs as they corrode and get bad connectivity.

My R31 has been doing this on and off for a while and I've replaced alot of the same things you have but I'm going to be replacing the CAS plug and Coolant temp sensor plug soon.

Get on R31 Skyline Club and you will find this is a VERY common problem with RB30's

Here --->> http://forum.r31skylineclub.com/index.php?board=7.0

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cheers guys just replaced most of the connectors recently ive wired 12v to the coil no difference have noticed its heaps worse if I have no ait filter on the end of my afm if I block the intake partially with my hand it comes good its doing my head in lol

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Could well be AFM. I'm looking into purchasing a newy or a Refurb as all of the three I have are 20+ years old and unknown condish.

Best I've found so far is a New aftermarket for $175+ post.

PM me if you want one. :thumbsup:

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Could be dodge Earths or Loom related. The intake Backfire is supposedly a Lean issue, so any shortage of fuel or incorrect airflow signal could be to blame.

Airleaks, Fuel line Blockage / filter, injectors, so many things.

Have you read the ECU leds for Fault codes?

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only codes I'm getting is a/c speed sensor and the one saying everything is working good I've changed all intake gaskets and hoses changes iac and gaskets to try fix the issues no change new fuel pump and fpr i can hear the pump pressurise and there is pressure in the line if i take it off i have only used the stock efi loom earths on the manifold but surely that should be plenty there straight to the battery i have removed the fuel filter there was no change I'm going to buy a new dizzy with cas,o2 sensor,leads see how that goes afar that everything has been changed except the air valve thing on the manifold near the thermostat and the ecu

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The "Air Valve Thing" is the Air Regulator. That should really only do anything on Coldstart, as in, when you start it and let it idle, if the idle drops down after 30secs or so, it's working.

http://wiki.r31skylineclub.com/index.php?title=Air_Regulator

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