Rough Idol

[Casssss]

Hey all,

I have a VP series 2 and having a bit of a problem with it.
When the car is idoling both hot and cold it is missing causing a very rough idol.
Ive changed plugs, leads, tried another coil pack, cleaned my injectors.

problem is still there. it only misses on cylinder 6 and when the car revs alittle its sweet as.

Any suggestions what it could be?

[pow3rslave]

did you just change the coil pack or do the ignition module as well?

[crazybiker]

It's possible that the bellmouth that's in the top of the intake manifold has been removed. It was designed to allow more even airflow to the back to cylinders for a better idle.

[Casssss]

did you just change the coil pack or do the ignition module as well?

No i just switched the single coil pack......got it off a mate had a spare one.....
Might give that a go.

If the ignition module went, then would both the plugs not be working for instance 6 & 3?

[Casssss]

It's possible that the bellmouth that's in the top of the intake manifold has been removed. It was designed to allow more even airflow to the back to cylinders for a better idle.

Nah i know its still in there cause the car has been in the family since new, its schmick as.....would removing it help you think to get more air flow?

[crazybiker]

No. Leaving it in there helps it get more airflow.

The bellmouth was designed to allow better airflow for the back to 2 cylinders

[Casssss]

fair enough well its still in there so that's swett

[crazybiker]

I'd have a look at the DFI module then next.

[Casssss]

I'll try changing it asap and let you know how it goes.....

Anyone ever experienced anything similar?

[crazybiker]

I had mine completely stalling. Wouldn't idle.

Turn up to a set of lights, and you'd lose the benefits of power steering and the brake booster.

Mine was a Throttle Position Sensor problem.

[Casssss]

Alright so I've done what i can and nothing......still crappy.
did a compression test at a mates workshop and found i was losing compression in that cylinder so its been put down to a valve problem.....

so yeah im not rating myself to do that job so getting it done...
hopefully that fixes it.....

cheers for your help guys.

I'll let ya know if all goes well.

[crazybiker]

How much compression was lost?

[Casssss]

Ummm i just spoke to my dad over the phone and i think he said something about them all reading at 130 and the 6th reading at 90......

to be honest i dont have much of an idea what this means thats why it's being dealt with my someone who does.

Do those numbers make sense? like wanna give me a quick crash coarse please

[crazybiker]

No. I wouldn't really understand. I just wanted to know what it was in comparison to the other ones

But if it's reading 40 less, then there is quite the problem.