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[Martin_1962]

Lead and CD are in the seat pocket!

The vapouriser damage


A job for a valve compressor


Another view


Found my original save - John wiped my latest one off his lap top


Have you seen this before?

[Martin_1962]

First I've heard of a vap. shutting off on the overrun on a SGI system? It should just maintain a constant vapour pressure relative to the manifold. The injectors don't get triggered on the overrun anyway. It's built into the petrol ECU.

If it's the MAF you would have the same problem on petrol.

Kevin

Not shut off completely but a lot, the manifold vacuum adjusts that lever, but the seat damage means it doesn't seal as much as it should.

Runs not bad on gas (smooth ect just not full RPM anymore) well on DECENT petrol.

What would a faulty MAF actually do to the cars running?

[Martin_1962]

Since then now changes on acceleration and the trims were all 0 I had to richen a couple at low RPM and weaken at higher RPM.

Actually that is not a good example

[Kevin Wood]

What would a faulty MAF actually do to the cars running?

It's the primary input to the ECU for engine load so potentially quite a lot. They seem to fail by gradually losing sensitivity, which gets trimmed out by the ECU until it runs out of fuel trim. Then it'll start to run poorly. Have seen a 2.6 spitting back into the plenum because it's idling very lean.

Kevin

[Martin_1962]

That sounds a bit yuck

What do I do next then?

I could spend £200 on bits I don't need (but vapouriser is near end of life), and £30 for a MAF was nice and cheap.

Economy is about usual 90 to 100 miles until light 4 goes out on LPG, actually it was about 10 later but I did do 5 on petrol yesterday to see how it was going.

And the other 5 could be the longer run on Sunday

[Martin_1962]

This is the cheapest I have found

http://cgi.ebay.co.uk/Vauxhall-Airflow-Meter-93171760-BOSCH-0281002184_W0QQitemZ230323466205QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item35a0592fdd

[Kevin Wood]

What do I do next then?

Well, if the vapouriser and MAF are both potentially suspects some more diag is required.

Ideally, get a Tech 2 on it and watch the fuel trims and MAF signal in the live data, on both petrol and LPG, and see what's going on.

Or:

Fire up the LPG software and make sure that the vapour pressure is correct and stable, and that the petrol ECU output duration doesn't  change huigely when it switches to gas.

Kevin

[feeutfo]

This is the cheapest I have found

http://cgi.ebay.co.uk/Vauxhall-Airflow-Meter-93171760-BOSCH-0281002184_W0QQitemZ230323466205QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item35a0592fdd

dont believe thats right, 3.2 and 2.6 are same, but differant to 2.5 and 3.0 afaik???

[Martin_1962]

If the MAF was going would that have explained the lazy performance last week and the 3.0 performance (on petrol) today?

[Martin_1962]

This is the cheapest I have found

http://cgi.ebay.co.uk/Vauxhall-Airflow-Meter-93171760-BOSCH-0281002184_W0QQitemZ230323466205QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item35a0592fdd

dont believe thats right, 3.2 and 2.6 are same, but differant to 2.5 and 3.0 afaik???

Can you remember the part number?

Found a Bosch non VX for the 2.6 for about 108 now

[Martin_1962]

Actually when it was sluggish I was woondering about the MAF