major intermittent problem.

[off_tap_vl]

iv had my vl for a few years now and for the last 6 or 7 months it just wont go anywhere.
it starts and idols as usual but when i go to take off it just sits there and misses. Its almost
like a flat spot but a big 1. But the next day it will run perfectly. even recently it has backfired and cut out completely. I have done the leads, plugs, dizzy, coil. swapped the afm for a second hand1. diagnostic mode comes back satisfactory while the problem is happening. i have no f*****g ideas.
Any help will be appreciated.

 

[detox_nath83]

clear the Computer and do another diagnostic.
either your fuel pump either 2 of them Inertia(inside tank) and high pressure(External)is on its way out.
fuel filter blocked??.....
it does sound like it is a Crank angle Sensor (CAS) problem or the Air Flow Meter(AFM).. thats what they cause when not running correctly.
u say u have swapped the afm was it a good working one???? Backfires can cause the hot wire in the AFM to blow out and destroy the AFM..
was the CAS(inside Dizzy) a good one as well??? (Where these from a wreckers? could be damaged already)
also check all your vacuum lines as well as your intake piping has no leaks between AFM and throttlebody this will cause car to run ****.
Let us know..... it does not sound like a huge problem... i would say nearly all Rb30 owners have had this problem before as the engines are 20+ years old now.
Another could be the Throttle Position Sensor(TPS) or AAC Valve located on Plenum..
Goodluck

 

[off_tap_vl]

cheers. the afm came from a mate who said it was good. and the dizzy and transistor are only 4 months old. i might check the aac valve. what exactally does this do? and how much? also the TPS how would i go about checking that?

 

[jatsvl]

as detox nath83 has said and check that your timing is correct and check the condition of your timing belt and tensioner pulley.

 

[Spin]

i'd go for a new CAS mate. they are known for being a bitch at the most inopportune moments....like when you want the car to actualy run. I have put three in mine so far.

 

[Gurner]

I had the same problem with mine couple months ago. Fuel pump.

 

[off_tap_vl]

which 1 bro?

 

[off_tap_vl]

it turns out to be the h/p fuel pump. thanks everyone for the helpful info. cheers

 

[detox_nath83]

nice man knew it wouldnt be too big a problem..

 

[revv_head]

Idols..... LOL