Mud-club

Vehicle & Technical => Series Land Rovers => Topic started by: swc on July 26, 2006, 13:39:28

Title: miss firing
Post by: swc on July 26, 2006, 13:39:28

my previously smooth running series3 2.25 petrol with k&n filter is suddenly miss firing at idle. the only difference is that Ive sprayed a little waxoyl around (not deliberately near the engine!), could i have knackered the filter, are they easy to clean?

Title: miss firing
Post by: mark.yellow.series.3 on July 26, 2006, 20:35:20

take the filter off and then run the engine, but i would expect it to run bad under load not at idle,

Title: miss firing
Post by: James.Harwood on July 30, 2006, 08:41:13

Is the filter red or black(if you used black waxoil).  Black filter needs cleaning, red ok.  K&N filters take a lot to block up, when they do get towards the stage of needing cleaning you only realy notice a drop in top end performance.

It is more likely to be be a spot of dirt in the idle jet in the carb, which carb are you using.

Title: miss firing
Post by: swc on July 30, 2006, 15:56:42

thanks for your replys. took the filter off this , no difference( although it is black).Continues to sound fine under load. Coming down hill , sounds awful back firing when using engine to brake. This all happened very suddenly, will investigate carb as suggested thanks again.

Title: miss firing
Post by: James.Harwood on July 30, 2006, 17:18:07

You may well have an air leak on the carb, this would explain the 'back firing' on engine braking.  

Pops and bangs on engine overun are not a bad thing, it shows that your head is in good condition and you either have a 'Straight Through' exahust or knackered silencer box.

Title: miss firing
Post by: swc on August 17, 2006, 15:05:40

i have now cleaned and replaced the jets on my zenith carb to no good effect.still missing at idle and sounds terrible on over run

Title: miss firing
Post by: TechnoTurkey on August 17, 2006, 15:26:30

could you have knocked the timing out a fraction?

Title: miss firing
Post by: Devon-Rover on August 17, 2006, 16:38:23

Does the popping and banging on overun cure it self / get better if you pull the choke out?

Title: miss firing
Post by: James.Harwood on August 17, 2006, 21:58:37

Check that the HT leads are all connected properly and in good condition (when dark start engine and look for blue arks from leads to somewhere else). Check Distributor cap for cracks (on the inside) and all the 'pins' are there. Check points and condensor.

Title: miss firing
Post by: James.Harwood on August 17, 2006, 22:00:01

clean contacts on rotor arm. (forgot to mention that).

Good luck

let us know how all that goes

James

Ps what part of the world are you in.

Title: Points
Post by: Artwigwa on August 18, 2006, 17:55:46

I had the same prob with my petrol landy, the points had closed slightly, cleaned and set them and all was well?!

Title: miss firing
Post by: mark.yellow.series.3 on August 22, 2006, 21:56:30

my V8 back fire on overun, and i cured my (nearly). the problem with mine was timing too far retarded and feul mixture to rich.

Title: miss firing
Post by: swc on August 23, 2006, 12:30:20

thanks for further thoughts, pulling choke out does help but so does any extra revs. I've had a quick look at ht leads seem ok and had distrbutor cap off and cleaned pins and rotor arm- no difference.next move is to have a look at the points(when wife and children alllow).