P38 V8 4.0 Ltr and LPG Misfires

J

jonesey10a

New Member

Posts

5

• Jan 25, 2010

• #1

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

 

G

gavbriggs

Well-Known Member

Posts

5,861

Location

Sheffield uk

• Jan 25, 2010

• #2

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.

 

J

jonesey10a

New Member

Posts

5

• Jan 25, 2010

• #3

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

 

rewmer

Well-Known Member

Posts

2,082

Location

Clacton, Essex, UK

• Jan 25, 2010

• #4

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.

 

J

jonesey10a

New Member

Posts

5

• Jan 25, 2010

• #5

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

 

J

jonesey10a

New Member

Posts

5

• Jan 25, 2010

• #6

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

 

J

jonesey10a

New Member

Posts

5

• Jan 27, 2010

• #7

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

 

skirabb

Member

Posts

63

Location

Hertfordshire

• Jan 27, 2010

• #8

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?