Holding back at low Revs
Discussion
Hi Mark, Yes i have seen this in varying degrees and different causes, first and the most likely, is a build of deposits on the throttle flap, easily rectified, just requires the large black intake hose removing it's held on with a large plastic clip, then the throttle flap just want a clean with something like carburettor cleaner, then rebuild and try all in all about a 10 minute job, the next is poor connections either at the throttle pedal or the throttle body, just removing and refitting the connections can rectify this, but care must be taken as not to damage the connectors or securing clips, next is an error with in the ecu programming (glitch) a reflash can help or there may be an update to the program, there are other possible causes but these are the common ones, If it's the throttle response that is the issue (lag) This is a general complaint, then a modified ecu program (remap) and a sports rear box exhaust will improve this,
Mark if you want to try the first two then, i can post some pictures or perhaps a video showing how,
Mark if you want to try the first two then, i can post some pictures or perhaps a video showing how,
here we are mark a bit of direction and a short video, mmmmm don't think i will give up my day job just yet and go into film production took three attempts to get to this,
http://www.derbymotorservices.com/faq/questions/12...
http://www.derbymotorservices.com/faq/questions/12...
If the car is holding back on almost no throttle and doing the same in cruse (it will be more noticeable going down hill in Cruse) you have probably had a flat battery or disconnected the battery at some time,
If so you will need to carry out a cam learn.
Drive along in 6th gear at 70 mph lift of and coast down to 30mph still in 6th, (do not use the brake) you will need to do this 2 to 3 times. (try to find a flat road and do it over the same piece of road)
To check the car has learned the profiles drive in cruse down a slight hill, it should now be smoother
If so you will need to carry out a cam learn.
Drive along in 6th gear at 70 mph lift of and coast down to 30mph still in 6th, (do not use the brake) you will need to do this 2 to 3 times. (try to find a flat road and do it over the same piece of road)
To check the car has learned the profiles drive in cruse down a slight hill, it should now be smoother
The cam learn has various names (flywheel adaption, misfire learn etc) it’s all the same,
Basically it’s were the car learns the fuelling adaptions and misfire adaptions,
It looks like your car has lost this from its memory that’s why I asked if you have had a flat battery or disconnected the battery,
It does not matter that you don’t have cruise, its jut more noticeable in it.
Try the process any way it’s cheaper than a re-flash.
Basically it’s were the car learns the fuelling adaptions and misfire adaptions,
It looks like your car has lost this from its memory that’s why I asked if you have had a flat battery or disconnected the battery,
It does not matter that you don’t have cruise, its jut more noticeable in it.
Try the process any way it’s cheaper than a re-flash.
cheviotred said:
Wondering if the advice here is equally applicable to a 1995 i6 DB7? I seem to have a similar issue - worth my trying the "cam learn" and/or getting the throttle cleaned out?
Thanks in advance ...
On the old I6 I'd check the MAP pipe from the MAP module on the N/S/F wing if I were you. It goes hard over time and breaks down inside causing idling problems and such like. You may have to take it completely off and blow down it to be sure. (It goes to the inlet manifold)Thanks in advance ...
Also make sure the ignition cables are good and that cylinder 6 plug hole isn't full of water. There's a handy drain on the scuttle panel that lets water pour straight in!
This only applies to the non-airbag cars though. The ones with the grey instrument cluster. AKA the Zytek cars.
Edited by Knights of Aston on Tuesday 20th October 15:13
KoA:
Thanks for the reply. Whether I have a 'series 1' or 'series 2' car is something of a moot point. It's partly series 1, partly series 2 and partly unique, as it's a surviving FEV prototype db7 i-6 volante from 1995, and thus bridges the gap between the series. It has airbags, but much of the insides are series 1 derived, but by no means all. Series 1.5 perhaps?
Anyhow, your comments are very helpful in guiding me to a possible cause. Thank you for this, and for taking the time. The car is now with my mechanic, and I will let you know what he finds ...
Simon.
Thanks for the reply. Whether I have a 'series 1' or 'series 2' car is something of a moot point. It's partly series 1, partly series 2 and partly unique, as it's a surviving FEV prototype db7 i-6 volante from 1995, and thus bridges the gap between the series. It has airbags, but much of the insides are series 1 derived, but by no means all. Series 1.5 perhaps?
Anyhow, your comments are very helpful in guiding me to a possible cause. Thank you for this, and for taking the time. The car is now with my mechanic, and I will let you know what he finds ...
Simon.
Edited by cheviotred on Wednesday 21st October 11:35
Edited by cheviotred on Wednesday 21st October 11:35
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