Rb30E Problems

[erall0]

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

[Ben C34]

Check injectors are getting full voltage.

[erall0]

what is full voltage mate 12?

[Ben C34]

With car off I'd expect 12, with car on and revving 14.4 .

Dodgy earth's can also create havoc.

[erall0]

thanks mate ill check it all out

[erall0]

injectors are getting good voltage my coil is getting 10.8v is that normal also should the injectors pulse with the key on when u tap the throttle

[Ben C34]

Coils should be getting full voltage also. 10.8 is too low.

No, injectors should do nothing with key on.

[erall0]

thanks for the reply when I tap the throttle I get all the injectors pulse then if I close and do it again they pulse again any ideas why my coil is getting 10.8

[Ben C34]

Well that's wrong.

No idea why. Dodgy wiring?

[Got a Pulsar]

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

[erall0]

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

[zebra]

Ahhh

Sounds like a dodgy AFM

Did you replace it with a new one?

[Got a Pulsar]

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.

[erall0]

i got 2 arms here both do the same thing one is brand new cost me 450 off ebay checked them with multimeters they check out fine

[erall0]

do u know what the cas volts should be ?

[erall0]

I've gone though basically everything only thing i can think of if my new cas is dodgy and it keeps playing with my timing if the cas works that way on a rb30

[erall0]

or my ecu is bad but its the cleanest ecu i have seen in a long time

[Got a Pulsar]

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?

[erall0]

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

[Got a Pulsar]

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