had an issue with the car at the beginning of the week where it felt like it was running on 5 and a half cylinders and I suspected a faulty injector. Turned out injector No1 was on the blink. Changed the injector yesterday and it seems to have cured the problem, at least to 90%

 

The problem is that I still have a slight hesitation and the feeling it´´s running on 5 and 3 quarter cylinders on idle and pulling away from the traffic lights. Onnce the car is moving and above 1500 rmp it drives fine.

 

I measured all the injectors and they all read between 11.9 and 12.1 on resistance so they should be okay.

 

does anyone have any idea what could be causing this ?

 

Cheers

 

Maz

 

:)

have you checked the coilpacks?

Good point mate, I´ve got new coil pack connectors but haven´t checked the coil packs themselves. Is there a way of checking the coil packs or is it a matter of using a spare one and changing them one by one until you find out whether or not is was a coil pack ?

 

Maz

you could try pulling the connectors off 1 by 1 with the engine running... if there is no change in the engine note after pulling the connector then you know that coil pack is suspect..

unless you have datascan or conzult where you can just do a cylinder drop test which would be easier.

I´´m not sure that would work mate, the problem isn´t that drastic like losing a whole cylinder, which you would notice right away. It´s kind of hard to describe. when an injector goes the car sounds and drives like a tractor, this feels the same on idle and when pulling away but just nowhere near as bad...like 10% of that sound and feeling of running on 5 cylinders. Hardly noticable on idle from listening to it from the outside, if you didn´t know the car you might even think it always idles that way...but there´s a slight shaking and uneven idle

 

:confused1:

I´´m not sure that would work mate, the problem isn´t that drastic like losing a whole cylinder, which you would notice right away. It´s kind of hard to describe. when an injector goes the car sounds and drives like a tractor, this feels the same on idle and when pulling away but just nowhere near as bad...like 10% of that sound and feeling of running on 5 cylinders. Hardly noticable on idle from listening to it from the outside, if you didn´t know the car you might even think it always idles that way...but there´s a slight shaking and uneven idle

 

:confused1:

 

have you done a compression test?

haven´t done a compression test yet...was hoping I didn´t have to go down that road, but I guess I will have to eventually.

 

I think I´ll recheck everything over again, injectors, coil packs, CAS. TPS etc and see if I come up with anything.

 

Cheers Joel

 

:)

SORTED!

 

Sometimes I´m just dump :( Should have noticed that....checked all the injector connectors and one of them wasn´t on properly , pushed it all the way on and the engine is running 100% again......sorry for wasting your time there guys.

 

:)

 

Maz