4.5 AJP " lumpy " when cold

[Pete7]

Hi

should my Cerbera run like its on 6 or 7 cylinders whilst cold, but then all is smooth after 5 miles or so when the engine temp is up?

Even when warm its a little bit uneven feeling at slow, town speeds but pulls like a train when floored.

I guess i need a diagnostics check to really know whats happening but maybe this is normal???

cheers

Pete

[Boatbuoy]

It's normal for low, town speeds. Don't worry it's just your car telling you it's unhappy that it's not in its natural environment. Full throttleon the Kamel Straight however.....

[Chaz9950]

I'm no expert, but it could be something simple like you're plugs / HT leads.

Pull all of your spark plugs out 1 at a time, and clean with a wire brush. Re-gap if necessary.

All your plug leads should firmly attach to the plugs, if not may have a likely culprit.

[Supateg]

Funny , the wife and daughter call my cerb 'lumpy'
To me it's biss!

[Mags]

Mine was doing something similar to this a while ago, turned out to be knackered throttle pots. although they could just need setting up as well.

[Mr Cerbera]

It is NOT normal. My Cerb ticks over as smooth as....
BUT
I did have a problem similar-sounding to yours. I checked the exhaust manifold temps with one of these after a few mins driving and found two of them were too low.

Changed the leads and plugs and she was smoother than a belly-dancer's abs again.

Edited by Mr Cerbera on Wednesday 19th February 14:14

[MH Dneg]

...agree with Mr C...mine is also as smooth as silk!

[Pete7]

Mr Cerbera said:

It is NOT normal. My Cerb ticks over as smooth as....
BUT
I did have a problem similar-sounding to yours. I checked the exhaust manifold temps with one of these after a few mins driving and found two of them were too low.

Changed the leads and plugs and she was smoother than a belly-dancer's abs again.

Edited by Mr Cerbera on Wednesday 19th February 14:14

Nice one..!!!! i have purchased said BoysToy/Gadget and will check it out...!!!!!! :-)

thanks.

[Pete7]

2 new throttles pots and set up the throttle linkages and runs like a dream...!!!

Oil and filter change at the same time.

Thanks to Neil Garner Performance Engineering :-)

[jackwibble]

That's a result then! Is your car standard or have you had it re-mapped? A full remap will give you an even smoother bottom end ooh err missus

[Pete7]

Had short induction and remap with previous owner. :-)

[Mr Cerbera]

jackwibble said:

That's a result then! Is your car standard or have you had it re-mapped? A full remap will give you an even smoother bottom end ooh err missus

Doh ! Forgot to mention that I'd had that done.
Sorry !

[jackwibble]

Mr Cerbera said:

Doh ! Forgot to mention that I'd had that done.
Sorry !

"May '09
Had Joo at TCS fit Short Induction, 'Cool' Chip and bespoke remap. Managed to coax an extra 20% more power. Delivery has become super-smooth all the way through the rev range."

Let you off it was a while ago!

[fatjon]

Given the pain of getting all 8 plugs out of an AJP Cerb I would not clean and regap them, chuck them and put in a set on nice shiny new ones.

[Mr Cerbera]

jackwibble said:

"May '09
Had Joo at TCS fit Short Induction, 'Cool' Chip and bespoke remap. Managed to coax an extra 20% more power. Delivery has become super-smooth all the way through the rev range."

Let you off it was a while ago!

Blummin 'Eck ! I never thought people would read that stuff.
Ta, mate !

(amd have a blummin' great Cerb weekend)

[jackwibble]

Joo is still the god of AJP8 mapping bless him

[Pete7]

Looks like i have a generic map, though i struggle to read Joo's handwriting. :-)

[jackwibble]

Whirlwind/generic fuel/cooling mod, yep its a Jools generic chip will be an improvement over standard but not quite as good as bespoke mapping or he would be doing himself out of business!