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[Taxi_Driver]

Martin has kindly lent me his cable for reading my Romano ECU
The following are screenshots (I shrank em a tad too much but still readable)

I think ive got a knackered lambda sensor  









I havent changed any setting apart from the changeover time.....it was 30s.....ive changed it to 25, the lowest it will let me change it to.

I then read the engine ECU.......I got

P0650
P0170
P1700
P1130
P0130
P0301
P1650
P0460

Some of these are lambda related.....is this gonna be effecting fuel consumption?
And yes Ive just noticed the emissions light doesnt come on with ign......so looks like that bulb has blown!

Comments welcome  

[Martin_1962]

Is the Lambda connected to the LPG kit?

Mine isn't

[Kevin Wood]

Looks like your Lambda sensor possibly isn't connected to the LPG ECU as 4.18v is way above the normal range. Not necessarily a problem. It's probably only used for setting-up. Also interesting that you have an extra acceleration enrichment setting.

I'd guess that the LPG fuelling's a little out if you're getting codes related to Lambda so it could probably benefit from a bit of tuning.

Kevin

[Taxi_Driver]

Is the Lambda connected to the LPG kit?

Mine isn't

Good point also from Kevin.

I reset the codes earlier and only

P0650 and P0170 (when I reved it) came back immediately.

P0650 is broken management bulb ..... emissions bulb in my case
P0170 is too lean/rich

So if lambda sensor was knackered that should have reappeared immediately as well....it didnt.

I dont think Ive read the codes since we had the floods, when I went tho some quite deep water......so I guess the lambda errors (some of which are open/short codes) could have been caused by water logging  :-/

I'll keep an eye on the codes.

[Taxi_Driver]

Anythng I could alter that might reduce/get rid of the hesistation when I either blip the throttle when its idling in N or give it welly from standstill in D??

[JamesV6CDX]

Anythng I could alter that might reduce/get rid of the hesistation when I either blip the throttle or give it well from standstill??

I'm working on reducing that too Dave - and I am considering re-siting the injectors so they are closer to the cylinder.... it's all I can think of!

[Taxi_Driver]

Anythng I could alter that might reduce/get rid of the hesistation when I either blip the throttle or give it well from standstill??

I'm working on reducing that too Dave - and I am considering re-siting the injectors so they are closer to the cylinder.... it's all I can think of!

You were to quick James... for my edit lol.

But im not doing that!

[Kevin Wood]

Anythng I could alter that might reduce/get rid of the hesistation when I either blip the throttle when its idling in N or give it welly from standstill in D??

Well, you've got an "enrichment in acceleration" setting so that might be worth a play. It's always best to get the steady state fuelling right before you tune that, though, because you'll need a huge shot of acceleration enrichment if it's already running lean, and much less if it's running rich, IYSWIM.

Given that most of the fuel settings are all zero except the idle one which seems to have been leaned off 10%, and that you're getting a P0170, I would say that it hasn't been too carefully tuned. I'd connect the Lambda to the LPG ECU and see if you can improve it.

Kevin

[Kevin Wood]

I'm not sure I'm convinced it's the injector location, but I'd like to have a bash at drilling a set next to the petrol injectors.

Kevin

[VXL V6]

I'm not sure I'm convinced it's the injector location, but I'd like to have a bash at drilling a set next to the petrol injectors.

Kevin

Has anyone been able to confirm that the V6 inlet trumpets are all the same (obviously the injectors would be different). A set off a 2.5 complete with the injectors just went through eBay for £9.95 + delivery.....

[Taxi_Driver]

Anythng I could alter that might reduce/get rid of the hesistation when I either blip the throttle when its idling in N or give it welly from standstill in D??

Well, you've got an "enrichment in acceleration" setting so that might be worth a play. It's always best to get the steady state fuelling right before you tune that, though, because you'll need a huge shot of acceleration enrichment if it's already running lean, and much less if it's running rich, IYSWIM.

Given that most of the fuel settings are all zero except the idle one which seems to have been leaned off 10%, and that you're getting a P0170, I would say that it hasn't been too carefully tuned. I'd connect the Lambda to the LPG ECU and see if you can improve it.

Kevin

The 'enrichment in acceleration' is already set on almost max  :-/ but yes see what you mean.....it could be set too high if P0170 is saying too rich and not lean........guess that can only be proved with an exhaust gases analyser.

If I connect the lambda back up, will the lpg ECU adjust settings automatically as it will then be getting a sensible reading? Or was the lpg ECU's in my VeccyB/C more advanced as they used to self learn and adjust themselves.

[Taxi_Driver]

Anythng I could alter that might reduce/get rid of the hesistation when I either blip the throttle when its idling in N or give it welly from standstill in D??

Well, you've got an "enrichment in acceleration" setting so that might be worth a play. It's always best to get the steady state fuelling right before you tune that, though, because you'll need a huge shot of acceleration enrichment if it's already running lean, and much less if it's running rich, IYSWIM.

Given that most of the fuel settings are all zero except the idle one which seems to have been leaned off 10%, and that you're getting a P0170, I would say that it hasn't been too carefully tuned. I'd connect the Lambda to the LPG ECU and see if you can improve it.
Kevin

TBH im lost a bit on some of the settings........i dont know what they mean.....

For example.......

Extrainj senstiveness mean??

or
 
Summat to do with a Mazda???   Its a Vauxhall!!

[Kevin Wood]

I would guess the Lambda voltage is just for display purposes. The petrol ECU does the correction and the LPG ECU just follows suit, hence the petrol ECU deciding it's out of range. The trick, which can be done without the Lambda connected, is to switch the car between petrol and LPG at a given speed and load, and see if the petrol injector duration changes. Do that for each of the fuel settings boxes (it will probably highlight the one you're currently on) and it should be closer.

I was thinking the lambda voltage would be good to diagnose the acceleration enrichment, as you can watch to see if it goes rich or lean when you stand on the loud pedal.

Kevin

[Kevin Wood]

Forgot to say above, that you have to adjust the LPG fuel so the petrol injector duration stays the same when you switch between the two. LPG injector duration isn't important.

Also, this only works for speed and load settings where the closed loop lambda control is working, so above about half throttle and at high revs it won't. This is where a lambda voltage is useful.

Kevin

[Craig_R]

TD you have a 4 pot lambda it differs from a v6 lambda

looks like your LPG ECU is set to a 1volt lambda it needs to be a 5 volt one for your car

The 4 Pot lambda is a 5volt sensor where the V6 is a 1volt sensor

The 5volt sensor is called a Titania Sensor which is used on all 4 pot Omegas
The 1volt sensor is called a Zirconia Sensor which is used on all V6 Omegas

I had the problem that my LPG ECU was set to a 1 Volt sensor and was giving an incorrect setting all the time as my lambda was most times above 1volt

Ill get some more info if you need it I only found all this out when i bought a new Lambda and phoned NGK to ask them the difference between the two sensors