HELP Car wont start

[truckarms]

Right I have just had my car converted to LPG (thanks to Tony and WTV-UK) however when the guy from WTV was setting the ecu etc we found out that my plugs were old and needed changing and upgrading (iridium). So he set the kit up as best he could and tried to get it running but it was really rough but he thought everything would be ok once I put the new plugs in.
So off I went and bought some very expensive Denso iridium plugs and installed them yesterday. Car ran fine on petrol but still rough on LPG so i did a search etc and found out that I should have double checked all the gaps and set them all to 0.8mm. So today I took them all out and tried my best to set the gaps to 0.8mm. Not that easy but I think I managed it ok.
So took the car for a little spin round the block, firstly on petrol till it started to get warm, then I switched over and it was still rough. So I switched back and droive it back to the house on petrol. Parked but left the engine, then tried to flick it back onto gas, (I just wanted to check if it would idle on gas or not) car backfired and made a wee popping sound so I flicked back to petrol quickly however the engine died.
Now if I try toi start it it will only run for a second or so and die, if I accelerate while starting it seems ok but will then die.
Any ideas what I have done?
Please help, I feel very sad at the moment as I have broken my baby!!!!
Cheers

[TonyN]

Oh dear, backfires on LPG are bad on plastic parts, check it hasn't blown the intake hoses off, and check the airflow meter flap for damage.

Are you sure it was running OK after putting the new plugs in, I thought the injection systems where better for back fires as it only fires in a small amount of gas at one time.

They take some sorting out sometimes, but it'll be worth it.

[truckarms]

Will have a look at the hoses tomorrow,

It has never run well on gas, but seemed ok on petrol before I changed over.
Now its not running well on pertol.

What would happen if I had too small a gap on the plugs? It was a really tight fit getting the measuring strip in, could it be that my gap is now too small?

[Tallyman]

When checking plug gaps, the guage should be a sliding fit, not tight. However, even if you have the gaps a bit tight that's unlikely to stop the engine running. That sounds more like fuel starvation. Are you sure the changeover switch from LPG actually changed it back to petrol.

[truckarms]

How do I go about checking that I am getting fuel? Not something I have every really looked into?

[Tallyman]

To check you have fuel at the pump, try removing the fuel pump outlet hose - the one from the tank (put outlet into a glass jar or similar to catch the fuel) then turn the engine over on the starter. You should get a spurt of fuel out of the outlet pipe. If you have fuel, then the problem is either with the carb/injectors (not sure what you have on the V6) or in the ignition or ECU.

As it actually fires, all be it briefly, then it's less likely to be ignition, so possibly ECU but more likely a fuel blockage or incorrect signals to the injector system. If it is an injector system, when was the last time you ran any injector cleaner through the system? If it's a carb system, same applies to some extent (use redex regularly).

From your earlier description, the rough running is most likely to do with the set-up by the engineer/fitter in not getting the settings right.

Hope you can get it sorted quickly.

[truckarms]

Right so just checked and the fuel pump is not doing anything so going to try the wire across the terminals in the diagnostic port (thats what the hays manual says to do) If that fails then I have to start checking all the connections to the pump and see if the pump is getting any voltage.
If that fails I guess I need a new pump, any idea howmuch one of those is?
Cheers

[TonyN]

From your earlier description, the rough running is most likely to do with the set-up by the engineer/fitter in not getting the settings right.

Yeah, I heard he had right trouble with the guy who fitted it.

[truckarms]

haha, I hope the fitter did a very good job!!!

[TonyN]

haha, I hope the fitter did a very good job!!!

Are you still coming up friday? Or won't it run at all?

[Vagrant No2]

Fuel pump is possibley ECU pulse controled via the dizzy . It should have a 3 sec prime on it then wait for the pulse from ECU to keep the pump runnning , this was done as a saftey feature on most vehicles '91 onwards in case of a crash the pump would not keep fuel pumping out .

[truckarms]

Yeah its the fuel cut off relay, the pump kicks in so the engine starts then cuts off after about 15secs starving the engine, The rac man found the relay, it says fuel pump relay on it but having seen a thread on the Ozzy forum that said that thats the 4x4 relay I am a lttle worried however the relay did not do anything so I will try to get a new one anyway.
Cheers

[Tallyman]

Yeah, I heard he had right trouble with the guy who fitted it.

Tony, sorry but I thought from reading the thread that the other guy had done the LPG set-up, not you. Is that not correct?

[TonyN]

Tony, sorry but I thought from reading the thread that the other guy had done the LPG set-up, not you. Is that not correct?

Yeah, I was only messing about, I fitted the kit, then it had to go off and be certificated on the installation (which was fine ), then programmed.

Chris had a bunch of things to change/try as it didn't work when they tried to get it running on gas, but now its packed in on petrol as well now!

Its on the operating table on friday, suspect fuel pump relay first port of call, then maybe check the Cat isn't plugged up.

[neilacj]

3lt on gas

I have a 3lt v6 converted to gas it runs perfectly on gas i am in bristol the only time my would not run on gas i found the stepper motor was faultly
which side of the air flow meter dose the gas go into before or after the airflow meter neilaj@hotmail.com