Standard air box query??

[Cue]

A gradual worsening would lead me to think it's a build up of something, somewhere. Oil, water or crud on a mechanical or electrical part. I know this doesn't narrow it down at all but its the basis of a full investigation.

Also Wd40 wasn't designed as a lube as such, although people do use it as that for no apparent reason..... It was designed as a feeing agent for rusted tooling i.e. cleaner... hence it's name Water Displacement Version 40 - it took the designer 40 goes to get it right

 

[Robh18]

Possibly, however the vibration that occurs when the engine revs are built up and drop back down leads me to think its a miss fire does this sound possible ?

 

[Cue]

how are you feeling the vibrations? through the steering wheel? could be ball joints etc...?

 

[Robh18]

No the whole car vibrates when parked

 

[aucky]

^ mounts i would have thought

 

[Robh18]

Yeah but the shaking is coming from the engine new mounts that would be stiffer would make the shake more noticeable

 

[eljeffo64]

Would make vibration more noticeable but not shakes imo

 

[Robh18]

True ! Either way a correctly running engine at around 3000 rpm should not shake at all. And if the revs are increased or decreased the shaking stops which leads me to think maybe the engine is not advancing correctly at this rev band maybe ???

 

[Robh18]

And if so ... hopefully that will be my problem solved !!