Car judders but not coil pack related!!

[Noam]

I get the same judder as a coilpack blown but no missfires or codes or Check Engine light.
I was told it's most likely spark plug failure
Denso IK22 . 15000 km.
Any suggestions?
Thanks

 

[Ibiza125]

Sounds like a dodgy MAF to me.

 

[Noam]

How's that??
No codes related to MAF
No limp mode.
Car is fine but when full boost hits it judders like a coilpack gone.

 

[Ibiza125]

Doesn't have to be throwing up codes to be causing a problem. Mine did that when the MAF was on it's way.

It might be a coilpack that's on it's way as well, just now throwing up a code.

 

[Noam]

It's just I never heard of a car juddering like mine does right now due to MAF failure

 

[Ibiza125]

It's just I never heard of a car juddering like mine does right now due to MAF failure

Mine... Only under load though.

 

[Noam]

Well I hope you're wrong
I just switched to an open air filter , but not oiled.

 

[Ibiza125]

Well I hope you're wrong
I just switched to an open air filter , but not oiled.

Do you not hope I am right so that you can get the problem sorted

Very rarely is it an actual problem with the spark plugs. When were they last changed? Throw another set in anyway there's not expensive. I would stick with NGK by the way

 

[andycupra]

fault codes are not 100% reliable, particularly if its intermitent,

id say all of the above, eg coil, plugs or maf/induction kit are potential issues.

Firstly check all coils are in place ok, then maybe put the airbox back on seeing you have recently put the induction kit on.
regards the maf... you say why would that cause this.. - well given this is used to calculate and apply the correct air/fuel ration it would seem possible that if the maf was reading incorrectly then the mixture may not be correct and at high boost / revs (where there is more demand) this may show as a slight misfire.
Same for the plugs..

You could try running with the maf dissconnected as it will run using slightly safer assumed figures.


Coils would be the favourite usually, but id be checking all of the above.
If you dont have a spare coil its a good time to get one.
you could even change each coil in turn to see if it alters.

 

[Noam]

Thanks Andy . Thinking of all the above too .
Will pop in the garage tomorrow morning .
Hope it's only a coil as I like my induction sound and a MAF is a lot priceier .
Plugs were changed 15000 km ago to Denso IK22 BTW.