Emissions Problems on a Le Mans – High CO levels

Thats the part I have not forgotten the wiring manual but with 240 pages it took me some time to copy will send now

Thats the part I have not forgotten the wiring manual but with 240 pages it took me some time to copy will send now

Hi Andrew

Thanks for that.

240 pages! WOW I wasn't expecting a whole book, I imagined you would send a few pages. Thank You Very Much.

Paul.

UPDATE and part number check.

I had a chat with Gavin today and relayed all of the comments received from the forum members and he is leaning towards fitting a CO potentiometer so I will drop the car off at Autocraft tomorrow morning for it to be there Monday morning when Gavin will remove the leads from the Lambda Probe and attach them to a gizmo that replicates a variable resistor as a substitute CO pot and analyse the CO emissions. If this works we will then wire a CO pot to the Lambda Probe leads and send it for an MOT.

I have checked the part number catalogue and have found on page numbered, (or so it seems), 17.401 what I believe to be the CO Potentiometer numbered as 3 in the diagram and 77 00 722 068, can anybody confirm this or provide the correct information, please.

Regards

Paul.

Hi Guys

Latest update, the gizmo was used in place of the CO Pot and the emissions dropped to about 1.5%, result, happiness. Now ordered a CO Pot from Renault, the b*gger must be gold plated at £95 for a variable resistor, but Gavin refuses to fit a pre-used item in case it is defective. Expecting delivery of the CO Pot on Thursday as it must come from France.

Paul.

I think you need to be careful ....It may well control co levels but what impact will it have on fueling on boost ?
Looking at the ECU inputs the Lambda connects to the injector circuit and pin 35 and the CO pot to 35 and map sensor ..The Idle CO does more than just work at idle ,it gets data from all the other sensors .It just works at idle as you have no air temp data with the throttle plate closed .
May well be OK but I'd check AFR's on boost before giving it any big beans .

I think you need to be careful ....It may well control co levels but what impact will it have on fueling on boost ?
Looking at the ECU inputs the Lambda connects to the injector circuit and pin 35 and the CO pot to 35 and map sensor ..The Idle CO does more than just work at idle ,it gets data from all the other sensors .It just works at idle as you have no air temp data with the throttle plate closed .
May well be OK but I'd check AFR's on boost before giving it any big beans .

Hi Clee

Thanks for the heads up, I will copy and paste your words into a word document and hand them on to Gavin, he has been a little concerned as to the differences between the two ECU's and now has copies of the pin connections for both the D501 & D502 ECU's sent by Turbodog.

Paul.