Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[tgm147]

Morning all.

Just a quick question really after putting yet another set of plugs in the car yesterday. I'm using GM twin electrode plugs in the car but they're only lasting ~4000 miles before it starts to cough and splutter when accelerating. Fresh plugs and all is fine. This obviously doesn't seem right. How long are other peoples plugs lasting on LPG?

Cheers

[tigers_gonads]

I did about 7000 miles on my Gm twins before I had any problems 
One destroyed a centre electrode due to a HT fault but the others could have been cleaned up up stuck back in with no problem 

Tbh, at £2.50 ish plus vat on trade club, I intend to change them every year or so anyway 

I'd check your lpg map to see if it is burning a little weak (Hot) if they seem to be burning out quickly.

[sticka_v8_init]

Don't know if the Omegas are different but all LPG cars ive ever had (Escort, Rover 820, Chrysler Neon ) have thrived on the cheapest plugs

[Lazydocker]

Check your LPG system is set up correctly. Sounds like it's not right as I ran a set of GM twins for 30k (or was it 40k?) in my 3.0 and they looked like new when removed

The quads that are in the 3.2 ATM have been in since the LPG was fitted at 67,700 and I tipped over 83k yesterday without any issues

I don't believe in "special" plugs for LPG... If it's set up correctly then there is no need If you're destroying plugs in 4k I would be worried that it's running lean and could be doing even more damage that is, as yet, undiscovered The fortunate thing is that it's showing itself as a misfire and plug fault before it melts a piston

[TheBoy]

Reminds me, must change the GM twins in the MV6, been in 22k/2yrs

That said, no issues

[Kevin Wood]

What do the plugs look like when you take them out?

I would agree that it's likely running very lean and overheating the plugs. This can damage the rest of the engine so important to resolve this.

Another possibility is that the spark is very weak, and peters out when the plug starts to get soiled. Unlikely, though, I'd say.

Mine will quite happily do 40K on GM plugs on LPG and they look as good as new afterwards.