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SPARKYBLUE

New Member

• Jan 21, 2010

• #1

I have a 1995 discovery 3.9 v8 auto lpg/petrol conversion which keeps on backfiring and blowing the air filter off when in gas. When i flick over to petrol there's no power there. Any ideas?

 

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smurphy

Active Member

• Jan 22, 2010

• #2

Sounds like the timing may be out or rotor arm, dizzy cap, HT leads spark-plug(s) something along those lines.

 

fanatic

RESPECT IS EARNED, BEATINGS ARE FREE ;-)

Forum Sponsor

• Jan 22, 2010

• #3

dodgy lambda sensor if the gas system uses it for feedback,MAF, dodgy leads or head gasket blown across 2 cylinders

 

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SPARKYBLUE

New Member

• Jan 22, 2010

• #4

Many thanks, will try your suggestions

 

landowner

Pensioner Pete

Full Member

• Jan 22, 2010

• #5

SPARKYBLUE said:

I have a 1995 discovery 3.9 v8 auto lpg/petrol conversion which keeps on backfiring and blowing the air filter off when in gas. When i flick over to petrol there's no power there. Any ideas?

Click to expand...

I have been told that lpg motors are prone to backfireing but I've had two, both single point systems and they have never backfired.
Check for air leaks in induction, there is an item somewhere on this very subject, try an google it.

 

alexdon

Active Member

• Jan 22, 2010

• #6

It may be worth a quick look here - LPG Discussion Forum :: Index

 

mrnice

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• Jan 22, 2010

• #7

i have the same engine and had a backfire recently, turned out to be an air leak (hole in LPG stepper motor) in part of my LPG system after the Mass air flo sensor. take a look at some of my threads (on my page on the statistics tab) to see if they help.