Vr misfire

[ab56452001]

Hi need some help , the other morning started my vs auto/v6 and initialy was sort of running ruff , then after a few secs ok again , this morning same again starts up sort of misfiring then clears after a sec or two . Well this arvo it done it twice on the way home , starts running ruff , so i pull over and not long the idle is back to normall , then on the third time it konked completly ! , waited a bit turned it on and no probs drove home , all this happened in about 10km , i have been outside 4 times now and started it up no probs , i am guessing fuel blockadge/pump , anybody got any ideas ? , ta.

[hako]

First off, do a fault codes check (easy) Checking error codes VR/VS (Revised)
Have you washed the engine recently?....or is the engine using/losing coolant....how old are plugs/leads?

[ab56452001]

Thanks forv reply , just went for an extended test drive , thrashed it , got caught in traffic jam , just trundled along ,went round corners up and down hills , ran ok , got me stuffed ?!.

[hako]

I wouldn't wait for it to stuff up again - probably happen right outside a rough pub just on closing time. Do the codes check!!

[ab56452001]

Hi again , i reckon ive found 2 error codes after doing check , num 13 and 17 , 13 i believe is right hand o2 sensor and 17 i reckon is coolant sensor , this couldnt be cause of the misfiring could it ?!!!

[ab56452001]

Hi , does anybody have any suggestions from the error codes , should i replace coolant sensor or is there an ecm problem ? , ta

[Brett_jjj]

These error codes usually wont cause a misfire,but Id be fixing them anyway.Start by clearing the logged error codes by disconnecting the battery for a couple of minutes.Then drive it for 20 minutes to half an hour,and recheck the error codes to see if they return.If they do return,check the "bad" sensors wiring and connectors for bad or loose connections etc.If it all looks clean and tight,renew the sensor,they wear out over time, just like any other part.If you check or replace (replace is best if they look old) the plugs and leads,and its still misfiring,get hold a known working ignition coil,and swap it over,one at a time with each of your three coils,and drive it each time to see if theres any difference.If it turns out to be a faulty coil,its best to replace all 3 at the same time..Try to use genuine holden coils or quality aftermarket coils like MSD etc.Some cheaper coils dont last long and will wear out quickly.Another thing Id be doing is replacing the fuel filter if it hasnt been done in a while.It easy to do this yourself if you have axle/chassis stands or ramps.One other thing I can think of is the CAS(Crank Angle Sensor).This can cause bad running,misfiring etc etc when they get old.Same deal as with the coils,try to only use genuine holden CAS's.Sometimes a problem with the CAS wont set an error code either,so if its old, or a cheapie brand one,its worthwhile replacing it if theres a misfire problem you cant track down.

[wortus]

Does it only do it when the motor is cold? If it's when it's not fully warmed up could it be a fault in the charcoal cannister purge mechanism? It's only mrant to open when the motor is warm and the car is being driven above a certain speed. If the motor is cold or reving slow this valve being opened may make it run rough?

[ab56452001]

P.S. forgot to add , yes ir seems mainly to happen when cold .

[liamb51]

i have a vr and does from what i can tell the same thing, it misfires every now and then but somedays will run perfectly and the next it will stall when u put it in gear.. i have been told from 2 different mechanics that replacing the plugs and leads will fix the problem

[greenacc]

When my vs was playing up like that it was the DFI, but it should give you some codes in the 40's