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[Robski]

Got LPG and just had the spark plugs changed.But now the cars popping when on LPG,do the plugs need to be gapped down?

[Andy B]

Got LPG and just had the spark plugs changed.But now the cars popping when on LPG,do the plugs need to be gapped down?

I know nothing about LPG , but you don't or even can't 'gap' the OE 2 or 4 prong plugs.

[Darth Loo-knee]

I have just spoken to Rob on the phone.
After yesterday and trying to chase what someone else has done on his car, (the gearbox breather pipe was on the breather bridge for one) he started to get a clonking noise when the car changed gear. He this morning topped the gearbox oil up and now the clonking has gone. Also now the car runs how it should on Petrol but has this problem when on gas.
Anyone with any clues would be greatly appreciated

[CaptainZok]

Wasn't the same bunch that "installed" Danny's was it?
Butch & Sundance LPG Installers I think they were called.

[Darth Loo-knee]

No-one got any ideas?

[Kevin Wood]

Has the problem just started since the plugs were changed? Do you know what plugs were used?

I have GM 4 electrode plugs in mine. They are over 30K old including 12K on LPG and no problems at all. No gap adjustment required on these plugs.

When you say popping to you mean backfiring through the intake? If so this points to a lean condition. Does the problem occur at idle or under load? What type of LPG system is it? Mixer or SGI?

Sorry for the barrage questions. Just trying to establish what we're dealing with.

Kevin

[Darth Loo-knee]

Has the problem just started since the plugs were changed? Do you know what plugs were used?

I have GM 4 electrode plugs in mine. They are over 30K old including 12K on LPG and no problems at all. No gap adjustment required on these plugs.

When you say popping to you mean backfiring through the intake? If so this points to a lean condition. Does the problem occur at idle or under load? What type of LPG system is it? Mixer or SGI?

Sorry for the barrage questions. Just trying to establish what we're dealing with.

Kevin

Kev the car has a long history so here it goes...
Rob bought the car then had the Gas fitted. He says it run great with no problems at all He then got an oil leak on the drivers cam cover, so took it to a garage to have it done. The Cambelt was done also at this garage. From this point on it didn't run properly. So he took the car back to the Gas fitter where he found that the Garage had put the wrong connectors on the gas injectors.
Still the car was running wrong so then took back to the garage where they say the car is running correctly.
I checked the Cambelt Timing and it was hardly out.
The EGR Valve has been blocked off.
ICV cleaned out.
Dispack and Leads I have checked with known good ones, still the same.
I found that the gearbox breather was on the breather bridge, the breather pipe that was supposed to be on there was hanging down at the back  
The car was ticking over better but almost asthough it was missing very slightly.
Rob wet home the rag me as when he dropped his mate off, he got a clunking when the car changed gear. I reckoned it sounded asthough the gearbox needed oil. I had a word with Mark he mentioned something about with the gearbox breather being on Vac it would have given a false reading or something like that,  plus with the oil being low the torque convertor would be putting load on the engine which could effect the tick over....
Anyway Rob has topped up with gearbox oil and the clunking has gone and the car is running lovely on Petrol but like shit on the Gas.

As for the Plugs, they are Vauxhall plugs with the double electrodes on.
Pretty sure Rob told me that the gas is Sequent. Valve type = Europa. Reducer Type = Genius
Rob also says it is backfiring through the inlet when under load, but only when its on gas.

[Darth Loo-knee]

Hope that makes sense Kev :-?

[Kevin Wood]

Hmm. :-/ Sounds like there's still something up with the gas system. Might be worth checking that the injectors are now wired up correctly - both the pigyback cables on the petrol injectors and the gas injectors. Maybe a couple of cylinders are crossed. I made this mistake when I converted mine. It makes no difference on petrol if a couple of injectors are swapped over. The fuel is still there when the cylinder next fires. It's a different matter on gas though.

Is it raising any trouble codes when run on LPG?

Might be worth seeing if the software and cable for the LPG ECU are available cheaply. That will probably give you some live data from the gas ECU and allow you to switch individual cylinders over to spot which ones are giving trouble.

Kevin

[Darth Loo-knee]

Hmm. :-/ Sounds like there's still something up with the gas system. Might be worth checking that the injectors are now wired up correctly - both the pigyback cables on the petrol injectors and the gas injectors. Maybe a couple of cylinders are crossed. I made this mistake when I converted mine. It makes no difference on petrol if a couple of injectors are swapped over. The fuel is still there when the cylinder next fires. It's a different matter on gas though.

Is it raising any trouble codes when run on LPG?

Might be worth seeing if the software and cable for the LPG ECU are available cheaply. That will probably give you some live data from the gas ECU and allow you to switch individual cylinders over to spot which ones are giving trouble.

Kevin

The only thing I can say about what you have said is that there weren't any codes brought up at all. Since Rob got home and the problem with the gas has started should he do the paperclip test again to make sure?
I think he also said that he is due his 1000 miles gas service they should fix this problem surely?

[Darth Loo-knee]

Anyone?

[Marks DTM Calib]

Anyone?

What do you want, moon on a stick!

I told you how to sort the issue on petrol  

[Darth Loo-knee]

Anyone?

What do you want, moon on a stick!

I told you how to sort the issue on petrol  

And the issue is sorted on Petrol   have you not read

[Robski]

Just a quick update,running lovely now on petrol (Daz no more searching or anything   )but gas is still playing up but will go see worsley autogas tomorrow they fitted it just over 1000mls ago.Will update once I've seen gas man tomorrow and thanks for the help folks

[Darth Loo-knee]

Well now it is running well on Petrol it must be a Gas problem..