Engine stuttering at low RPM - HELP!!!!!

[shane@mbtech]

Headgasket

Hope not, but sounds like a possibility to me

Ask them to do a compression and leak down test

[s.mac]

mines at Murketts this week with the same problem, I will let you know what they say

[shimmy]

my HG failure was mainly noticable at high revs and not at idol.

slowly got worse lower down the rev range as i drive it more. I noticed it quite early i think as the trackday with Bealo was proof that it was playing up (he started keeping up)

By the time id driven home and then half way to simpsons it was considerably more noticable

I reckon it may be somethings else rather than HG (have either of you had any noticable increase in water/oil temps esp during the summer at trackdays?

[s.mac]

nope, mines definitely over fuelling, i think its a sensor some where

[shimmy]

Originally Posted by s.mac

nope, mines definitely over fuelling, i think its a sensor some where

when mine sounded really rough at low revs it was sensor in headers that had gone manky, but a fault did regsiter

[outnumbered]

Originally Posted by shepp80

Hi,

I'm getting a little concerned that BMW are still unable to find the fault with my CSL.

At low RPM in high gears if you place the throttle fully down the engine starts stuttering until the revs gets higher, forcing the car backwards and forwards (kangaroo effect!)

On power the car is absolutely fine. Its slowly got worse and worse throughout the last few months.

BMW have the car at the moment as its under warranty and they have replaced all the coils and spark plugs, a few different sensors etc, and even the clutch.

They are now balancing the throttle bodies and realigning the shims etc, which ive got to pay for??

Has anyone ever experienced this problem. They have had the car in and out for nearly 3 months.

Its gradually got worst and even sometime cuts out completely, almost like some is switching the ignition off very quickly.

So frustrating.

Any help or advice would be most helpful, as i think they really are clutching at straws!!

Thanks

Sure your car doesn't have a dodgy map on it ?

[NZ_M3]

Originally Posted by shepp80

At low RPM in high gears if you place the throttle fully down the engine starts stuttering until the revs gets higher, forcing the car backwards and forwards (kangaroo effect!)

What RPM and which gear? Is the car warm or cold?

Dealer diagnostic tools are capable of data logging on road tests, so technically speaking if they know what they are doing they should have been able to trouble shoot it.

Have they checked fuel pump?

[cantfind1]

Sounds like you have a lazy throttle actuator. They are prone to failure they can get slow when depressing the throttle. Will not throw a code as they are technically still working.

So to summarise when you are just cruising along at low revs in a high gear you push the throttle to the floor now the ecu pushes more fuel in but your throttles are slow to react and the car will run rich and bog down or kangaroo.

Could be your problem.

[s.mac]

thats mine to a T , I will mention it

[TANKSLAPPER]

Originally Posted by shimmy

I reckon it may be somethings else rather than HG (have either of you had any noticable increase in water/oil temps esp during the summer at trackdays?

I had that matey, only once.

what causes this Dr Shimmy. lol

T$