VEMS Community Forum

Technical => Fuel Injection => Topic started by: Tony C on February 04, 2007, 12:14:11 AM

Title: surging under light throttle and pop back when cold
Post by: Tony C on February 04, 2007, 12:14:11 AM
Hi Guys,
got a niggly problem that not managed to get rid of just yet,

when in traffic if you lightly touch the throttle while crawling it kangaroo's quite violent,
i have richened her up a bit but it didnt really help, am i going the right way?

also when cold (not all the time) if you pull away then stop and go to pull away again you sometimes get a pop back in the filter which indicates being lean when cold yeah?
why does this only happane sometimes??? i have picked the cold fuelling up 5 points across the whole range,

cheers....
Title: Re: surging under light throttle and pop back when cold
Post by: [email protected] on February 04, 2007, 12:29:22 AM
Theres a few possible reasons, can you do a datalog capturing the event?
Title: Re: surging under light throttle and pop back when cold
Post by: Tony C on February 04, 2007, 12:35:49 AM
not sure if i can get the pop back tomorrow, but will see if i can get the surging mate ta,
Title: Re: surging under light throttle and pop back when cold
Post by: BenR on February 04, 2007, 03:07:56 AM
Cold accel enrichment values?

I cant comment on the vems as i've had little experience with it, but with the OMEX's, if the idle speed was controlled using closed loop ignition advance/retard control, then light throttle would not be enough to bring it out of the idle strategy and it would kangaroo about as the ecu advanced adn retarded the ignition.