VG/VN v6 auto stalling at idle/full lock...running out of options

[jackktee]

Hey,

been trawling threads for a few weeks now and having similar problems to a lot of people but no solution yet

3.8L v6 VG auto ute

idle in drive, overdrive and reverse is intermittent and will conk out when slowing to a stop, doesnt have any dramas idling in park
also conks out in full lock (not a big issue as its an auto, i just put a bit on the brakes and accel a bit harder)

ive replaced the inlet manifold gaskets, cleaned the IAC and throttle body, reset the ecm

any advice would be greatly appreciated

thanks,

Jack

e/has no dramas starting back up again after stall, sometimes get a petrol smell in the cab when slowing down??

 

[jackktee]

just ran diagnostics and no error codes :/

im going to clean the tb and iac again

is it worth replacing o2 and tps sensors?

 

[VR38]

Full fuel pressure test before replacing sensors.

 

[jackktee]

thanks mate

is there a rough way to test the pressure without picking up a reg?

 

[hi_ryder]

pull the fuel reg's vac tube thats attached to the manifold, smell it. if you can smell petrol or petrol is leaking out it's fragged... it could still fail without leaking too so best to get a pressure test done anyway...

 

[VR38]

If you have an ohm meter test the temp sensor too.

 

[jackktee]

thanks again guys

definite petrol smell coming from the tube

cheapest i can find for a new one is around $100, any way to repair them or just fork out the cash?

ill try and track down an ohm meter too :beer chug:

 

[hi_ryder]

i just searched for one at the wreckers that didnt smell, the entry fee covered the cost... (wink)...

 

[jackktee]

hah good op... just for piece of mind this is the right part yeah? getting confused between the from engine and to engine

Holden Commodore VN 1988 1990 Fuelmiser Fuel Pressure Regulator FPR 121 | eBay

 

[VR38]

Yeap.
The one with the fuel hose going into the fuel rail with the vacuum hose coming off it.
No way of repairing sorry replacement only.
Maybe clean your spark plugs while your at it.
After you fit a good one do a simple cylinder balance test by running the engine and removing and replacing one injector plug at a time.
Every removed lead should result in an idle drop.