Missing and backfire

[BADCSL]

ok guys. the coil packs have been replaced and one plug...
technician test drove the car and the misfire is gone but now the car begins to jerk
he now suspects that the inlet manifold flat is jammed.
can this flat get jammed and cause the jerk.
what would be the next step.

[Equinox]

Get them to check the compressions

[BADCSL]

Originally Posted by Equinox

Get them to check the compressions

cool, will do

[Bounce]

Originally Posted by Equinox

Get them to check the compressions

You've changed your tune

[Equinox]

Originally Posted by Bounce

You've changed your tune

if i say anymore power will go to peoples heads and they will come for me

[shane@mbtech]

Originally Posted by BADCSL

it was the coil packs and one dead plug

Originally Posted by AlexGTT

Did they compression test it as well?

Originally Posted by Equinox

Why would you need to do a compression test if the coils sorted it out ?

Originally Posted by lawsy

Because those of us with experience do a thorough job.

Originally Posted by Equinox

So whenever you get a car in with a misfire you check the compressions, bit pointless.

Originally Posted by lawsy

Really.

Well I was trained correctly, and dont just replace parts because you think they need replacing.

Everyone thinks these computers tell you the cause. They read fault codes, that is the effect. I find the cause.

To do a compression test on a car takes no time at all. And knowing the s54, a compression test is a good idea.

Originally Posted by BADCSL

ok guys. the coil packs have been replaced and one plug...
technician test drove the car and the misfire is gone but now the car begins to jerk
he now suspects that the inlet manifold flat is jammed.
can this flat get jammed and cause the jerk.
what would be the next step.

I'm saying nothing

[Bounce]

Originally Posted by lawsy

I'm saying nothing

Thats not like you

[Equinox]

Well done youve passed your level one in using the quote facility.....

ill get my coat and leave now... !

[AlexGTT]

Originally Posted by lawsy

I'm saying nothing

Neither am I.

[NZ_M3]

Did you scan the car? Did it come back with any fault codes? If so what are they?

I am suspecting it might actually be the vanos control unit that sits under the vanos. The connections on those crack after a while through vibrations and heat cycles - you just need to open it up and resolder all the joints and it should be fine.

Would usually throw multiple codes for misfires and 2 vanos related codes.