Misfire in high gear 1750/2000rpm...

[phoenixcsl]

After 4 months of being without Cecil, he finally came home on Saturday...

Had my Schrick Cams fitted and a few other bits done such as a service, and had the front end re-sprayed from stone chips and the wheel arches, looks amazing.

So, when talking to ML they noticed a misfire approx 1750/2000 rpm, on the test drive it was hard to reproduce, so I took the car, said i'll run around in it for a few days and if it comes back will bring it back to get sorted.

Figured out that if the car is at the rev range and say i'm in 6th (normally i'd be in say 3rd so wouldn't notice), and then you go to WOT, there is a noticeable misfire, annoyingly, drop the gears and all is fine, no EML or warning lights, though the misfire is recorded on Cylinder 3 in the fault code.

They have fitted a new coil pack to the car, and new plugs, but neither have cured it, the coil packs are all Bosch ones which I replaced the lot last year, but they fitted a brand new Bosch one in just in-case.

What's the next point of call? Injectors? Do these go on CSL's?

Or Vanos solenoid? Though i'm running a Bessian Systems one which I changed last summer.

Any ideas?

[alexk]

Headgasket maybe ?

[shane@mbtech]

comp test, then leakdown test.

[Monkey]

Originally Posted by phoenixcsl

After 4 months of being without Cecil, he finally came home on Saturday...

Had my Schrick Cams fitted and a few other bits done such as a service, and had the front end re-sprayed from stone chips and the wheel arches, looks amazing.

So, when talking to ML they noticed a misfire approx 1750/2000 rpm, on the test drive it was hard to reproduce, so I took the car, said i'll run around in it for a few days and if it comes back will bring it back to get sorted.

Figured out that if the car is at the rev range and say i'm in 6th (normally i'd be in say 3rd so wouldn't notice), and then you go to WOT, there is a noticeable misfire, annoyingly, drop the gears and all is fine, no EML or warning lights, though the misfire is recorded on Cylinder 3 in the fault code.

They have fitted a new coil pack to the car, and new plugs, but neither have cured it, the coil packs are all Bosch ones which I replaced the lot last year, but they fitted a brand new Bosch one in just in-case.

What's the next point of call? Injectors? Do these go on CSL's?

Or Vanos solenoid? Though i'm running a Bessian Systems one which I changed last summer.

Any ideas?

Hi Toby,

When are you thinking about dropping it back down? Fair to say we were a bit pushed for time Saturday when you collected, I'm sure we'll quickly get to the bottom of it when we see the car again

[phoenixcsl]

Originally Posted by Monkey

Hi Toby,

When are you thinking about dropping it back down? Fair to say we were a bit pushed for time Saturday when you collected, I'm sure we'll quickly get to the bottom of it when we see the car again

Hi James,

I'll pop back in Saturday, Stuart has to sort out my old splitters and box up the original cam shafts for me anyway

Either or no drama mate

[phoenixcsl]

Originally Posted by alexk

Headgasket maybe ?

Shouldn't be head gasket Alex, they had the head off to replace the cams so it's brand new.

Originally Posted by lawsy

comp test, then leakdown test.

Good shout Shane, James, another job for you

[terraphantm]

Injectors are a good place to start.

Did you get a remap after fitting the cams?