Mud-club

Vehicle & Technical => Series Land Rovers => Topic started by: Roverland on January 04, 2007, 23:40:08

Title: What causes backfiring??
Post by: Roverland on January 04, 2007, 23:40:08

When firing up the V6 landy in the mornings it back fires quite loudly when i rev it. Whats causing it????

Title: What causes backfiring??
Post by: Rich_P on January 04, 2007, 23:46:37

Overfueling, or poor mixture causing poor detonation of the fuel and allowing some fuel to enter the exhaust.

Title: What causes backfiring??
Post by: Timi on January 05, 2007, 19:53:05

Quote from: "Rich_P"

Overfueling, or poor mixture causing poor detonation of the fuel and allowing some fuel to enter the exhaust.

Onions!!!  Or christmas sprouts!

Possible break down of HT lead miss fire would be evident, ignition timing choke malfunctioning possibly.

Any good what was the answer?

Title: What causes backfiring??
Post by: mark.yellow.series.3 on January 05, 2007, 21:25:57

is youre timing to far advanced? that will cause it.
KandN's with a sports exauste also gives you a bit of popping 8)

Title: What causes backfiring??
Post by: James.Harwood on January 06, 2007, 08:58:39

is the "back Firing" when increasing in revs or after on the overun (revs decreasing)

On overun this is normal with a sports exhast or broken exhast and a cylinder head in good condition.

When increasing the revs it could be anything listed above plus more.  

One thing to look for is 'blow back' particularly if you use unleaded fuel without a unleaded head.  Take the air pipe off the top of the carb and rev engine, if you have blow back you will notice the charge being 'blown back' out the carb (can be unburned or burning when this happens).  If this is the case you may have burned out valve seals or defective valve springs.