P38 V8 4.0 Ltr and LPG Misfires

Hi all,
I'm new to this forum but it looks great
My 1998 p38 has started banging (backfires) and missing on both fuels,when put under load it feels as if it is retarding. I know that the air flow mass meter breather pipe is u/s and a new one is on the way,will this be the fix or should i look elsewhere?
Any advice welcome.
Many thanks
Jonesey

if there are any air leaks on the intake then this could be the issue. i know the lpg kit will not tolerate extra air bieng allowed in.

check the whole intake for splits/cracks.

check the condition of the plugs and leads.

i suspect tho replacing the maf wont cure the issue as its on both lpg and petrol. the lpg system usually ignores the maf.

at night, in a dark place, lift bonnet whilst its ticking over and look for any arcing on coil pack and leads/plugs. you may have to give it a bit of revs to see anything.

Hi Gav,
Thanks for the advice, will do asap.
Regards
Les

Will have to agree with Gav (again) most certainly plugs or leads. I bet you find it lit up like a Christmas tree under there at night.

Hi
Yep i think it might be guy fawkes night in January
Thanks for your interest.
Regards
Les.

Have been under the bonnet (in the dark) could not see any arcing or sparking so wonder if a new set of plugs would be good?
jonesey10a

hi all
misfire sorted, new pipe fitted and a visit to lpg service engineer.
running cool
thanks to all
regards
les.

jonesey10a said:

hi all
misfire sorted, new pipe fitted and a visit to lpg service engineer.
running cool
thanks to all
regards
les.

Click to expand...

new pipe???which pipe?

what did the engineer do?