223 replies to this topic

[CHILL Gone DUTCH]

This afternoon I changed the primary lambda for another one OEM replacement, and the car turn to go fine. No misfires and strange things. Probably this will be ypur problem, but how Peter says in the tutorial, ecu is too much sensible to lambda readings, so it has to be an VX original replacemet. Hope this info will help.

That's good news and hope it helps the others

[DaveyC]

I have replaced mine recently and it made no improvement.

 

I have also run the car without it in the exhaust and the exact same misfire was present.

[CHILL Gone DUTCH]

I have replaced mine recently and it made no improvement.   I have also run the car without it in the exhaust and the exact same misfire was present.

Was it oem

[DaveyC]

Yeah. Or at least it was sold as OEM and cost as much as OEM.

[CHILL Gone DUTCH]

Yeah. Or at least it was sold as OEM and cost as much as OEM.

Are you sure you plugged the lambdas into the right plugs also as there is a spare plug on some cars which is easily confused And be 100% there oem Primary and secondary

Edited by CHILL Gone DUTCH, 28 January 2016 - 07:59 PM.

[DaveyC]

Yeah. With just the front plugged in I only get a trace for primary lambda in obd tuner and with only the rear plugged in I only get a trace for secondary lambda.

[CHILL Gone DUTCH]

Always worth checking

[DaveyC]

Yeah! Was puzzled by the spare plug for ages after putting the new engine in.

[Exmantaa]

I'm on comp cams blower cams. These were timed by Vocky. Had the same problem with standard cams in my old engine before it exploded, the timing chain was most recently replaced by Vocky on that one too.

So you had the exact same misfires with the old engine; so different head and cams... Really strange.

[DaveyC]

Same head, but cams and valves we changes.

[Hopegreen]

I would recommend to check the primary lambda borrowing one from another vx220 without misfires. There are different versions of OEM lambdas. Double check this.

[DaveyC]

Unfortunately I have changed the plug on mine because I needed the standard one elsewhere so it won't be a simple swap :/

 

I'll see if I can find the part number of the sensor I fitted. 99.99999999% sure it is legit as Peter stressed the importance of an OEM lambda sensor.

[oakmere]

You have changed the lambda sensor plug? If so I would double and triple check those connections. Did this only start with obd tuner or dose it predate this? Sorry I can't remember. Just thinking it might be worth getting another ecu to Peter for him to clone to rule out an ecu fault.

[DaveyC]

Yeah I needed the plug to use for the fuel pump and couldn't source one from anywhere so I used the lambda sensor one and replaced the lambda one with a generic waterproof plug.

Not really sure how to check the wiring - all is fine with a multimeter, I triple checked all the wires before wiring it up and I get traces you would expect to see in OBD tuner which correspond with the output of my wideband sensor.

 

Various set-ups over the past 18 months:

 

Old Courtney mapped ECU on old engine - had the problem

 

Bought a replacement ECU and sent it to Peter for OBD tuner for use on the new engine - still had the problem

 

Swapped the lambda sensor - still had the problem

 

Replaced the lambda sensor plug - still had the problem

[smiley]

When comparing dave's transient table to a few others, the throttle % really catches my eye.

It's so far off everybody elses i have seen.

 

Wonder what that does.

[techieboy]

Mine is exactly the same as DaveyC's. No misfires though (well one occasional one elsewhere).

[smiley]

Mine is exactly the same as DaveyC's.  

 

Bummer.

Can you post your transient table?

[techieboy]

[Exmantaa]

When comparing dave's transient table to a few others, the throttle % really catches my eye.

It's so far off everybody elses i have seen.

 

Wonder what that does.

 

That does exactly what is descibed; throttle flap speed (as % of max speed)...

Two different settings; a slow one for stationary and (normally) a quicker flap-speed map while driving. Davey's drive response will be a bit sluggish with those settings.
 

[oakmere]

Daveys and Techies look like they we're set for N/A not SC. They should not cause an issue though but will make the throttle less responsive.