Jump to content
steveo29

g60 bucks badly when coasting at speed

Recommended Posts

my g60 has always bucked when coasting under 60mph

 

 

 

say for instance you see a traffic light or slower car ahead and take your foot off the gas , it will buck /jerk like a mofo until you dip the clutch

 

 

 

checked all the obvious , everything is in good order , ive also ran differant ecu chip and they all do the same so that rules out the chip

 

 

 

its stock except chip/pully , decat , carbon can delete

 

 

 

any ideas please

Share this post


Link to post
Share on other sites

HI

Have you tested out the microswitch on the throttle actuating arm? On top of the inlet manifold? The bracket that its fixed to was bent away from actuating arm on mine car ticked over better and revs better since putting back in correct place. It should be made when on idle.

I had to adjust idle screw on mine when I put switch in correct position (at back of inlet manifold).

Hope this helps

Steve

Share this post


Link to post
Share on other sites

Hallo,

 

The digifant ECU is not the most refined and my G60 used to surge at certain points, the way the engine is designed to function is that when you come fully off the throttle at above 2500rpm (IIRC) it will cut all fuel to the engine, at around the 2250rpm mark it will start adding fuel again. If you have a lambda gauge you can see this in action as it will go fully lean when coming off the throttle and then start cycling showing lambda adaption at work.

 

It could be that some of the inputs into the ECU are messing up the response or that the ECU chip MAP you have is not very well suited to the mods you are running - worth checking/replacing the hose from the throttle body to the ECU is ok and is exactly 1m in length - it also has to go onto the correct outlet on the throttle body although I can't remember which one that is! Try swapping them over and see if it improves.

 

It could also be worn engine mounts (I would replace all 3 as a set).

Share this post


Link to post
Share on other sites

will see if i notice anything with the revs being 2500 or more

 

ive tried a few chips and theyre all the same with the bucking , so im fairly confident its not a poor chip

 

engine mounts are recent with a front vibratech one

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...