primo
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- Sep 10, 2009
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- VS Commodore
Hi Guys,
This one is a real challange that not even two different qualified mechanics can work out on my 98 seriess II V6 Ute.
I have had a rough idle over the last month that we can't diagnose. It drives beautifully and really smooth, but when coming to a stop it starts to misbehave. Driving off is fine. I have checked all the previous posts (they were really useful) and taken it to various mechanics with no luck and no error codes showing up!. This is what I have done to it over the last couple of months usually with genuine parts-
Replaced Fuel pump & filter, CAS, IAC, temp sensor(tte little one not the larger sender?), Fuel pressure regulator, Oxygen sensors, manifold gaskets.
Removed & cleaned Throttle body, plenum chamber, manifold, injectors where sent away for a proper clean, spark plugs checked, starter motor. Checked the vacum and purge hoses especially the ones connecting to the TB.
The above has certainly improved it's performance and starting but that rough idle is still there!
Would like some further advice on a likely cause. I'm thinking whether a compression test is valid?
One other thing, with the two purge/vacuum hoses that connect to the module towards the back of the intake manifold, how do you know in which order the hoses connect up? ie, there are two connectors, one goes off to the Throttle Body and the other one to the carbon canister, I have the bottom one going to the TB and the top one going to the canister?
This one is a real challange that not even two different qualified mechanics can work out on my 98 seriess II V6 Ute.
I have had a rough idle over the last month that we can't diagnose. It drives beautifully and really smooth, but when coming to a stop it starts to misbehave. Driving off is fine. I have checked all the previous posts (they were really useful) and taken it to various mechanics with no luck and no error codes showing up!. This is what I have done to it over the last couple of months usually with genuine parts-
Replaced Fuel pump & filter, CAS, IAC, temp sensor(tte little one not the larger sender?), Fuel pressure regulator, Oxygen sensors, manifold gaskets.
Removed & cleaned Throttle body, plenum chamber, manifold, injectors where sent away for a proper clean, spark plugs checked, starter motor. Checked the vacum and purge hoses especially the ones connecting to the TB.
The above has certainly improved it's performance and starting but that rough idle is still there!
Would like some further advice on a likely cause. I'm thinking whether a compression test is valid?
One other thing, with the two purge/vacuum hoses that connect to the module towards the back of the intake manifold, how do you know in which order the hoses connect up? ie, there are two connectors, one goes off to the Throttle Body and the other one to the carbon canister, I have the bottom one going to the TB and the top one going to the canister?