VT Rough idle!! after do head !!!

[teddybear]

Hi guys !. Ted here asking for your Help please anyone!!.

Problem: Rough idle ? Sucking air ? .

History: Head gasket died around number 4 cylinder , car got hot so the right head was warped a little bit. I had them machined 8th of a thousand and they were checked by them for cracks as well as for my self!. could not se nothing (but i did not get them xrayed). I put the all the part back together with placing silcone around in the 4 corners as well in the inlet manifold corners. Car started bled radiator and died from the smoke but after running the car for a 30 min and wearing components in i emptied the oil and filter and replaced and there is no more smoke

But the car is running rough when idleling !!

Checks!!
1. All vacum inlet hoses were checked to be on and for obvious leaks or cracks but none was found!!.
2. Ie then disconnected the throttle body and and intake box connections and this seem to not really bother the motor ie you could notice it, but it did not make the motor snuff out!!. (it is like they arent working)
3. All spark plugs are clean and firing plus i have new leads!!!

4. when driving car seems to be ok until stopping at lights or intersections and it runs rough again!!
5. No bubbles in radiator and no white sludge in cap no water out exhaust no water in oil !!
IS there anything that could be done before taking it to holden to get it diagnosed ,as I have ran out of ideas.



Regards

Teddy

[wrx884]

mayb simple but did the spark plug leads get put on in the correct order?

[Not_An_Abba_Fan]

Did you use new inlet manifold gaskets?

Check the purge hose under the throttle body.

[teddybear]

Yes to both! I went and got a new purge hose as the original kept on falling of. Any more ideas!!! could it be the pcv valve be causing this.

[Not_An_Abba_Fan]

Do an error code check.

[teddybear]

umm points to 22 and 23. But this is the big one if i unplug any of the sensors ie mass airflow, throttle body and idle the car still goes !!. This should make it stop as far as i know !! any ideas!!!

[kart_racer]

umm points to 22 and 23. But this is the big one if i unplug any of the sensors ie mass airflow, throttle body and idle the car still goes !!. This should make it stop as far as i know !! any ideas!!!

Not true, the PCM will still work but may pull timing as it cannot read air flow or air temperature.
22 is 'Throttle Position Sensor'
23 is 'MAT fault'

So you need to check those out.

[matt_suzie]

Not true, the PCM will still work but may pull timing as it cannot read air flow or air temperature.
22 is 'Throttle Position Sensor'
23 is 'MAT fault'

So you need to check those out.

Ok newb question but i have the exact problem vt drives ok then at lights and interesections on idle it gets rough and starts to like vibrate ,so what are the 'Throttle Position Sensor''MAT fault' ?? also anyone know of price's holden charge for fault finding ?

[Alex012]

How are going to plug in tech 2 watson holden bundoora will charge $105.00.
Also check if your coil packs are firing properly because one bad coil pack will cause the engine to miss at idle. You can check the voltage reading by plugging in tech 2. Don't start the car to check coil packs or else you will get zapped.

[acarmody]

Good on you for learning how to use the search function.

But you fail in checking thread dates.