Topic: miss firing (Read 1425 times)

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?

mark.yellow.series.3 · « **Reply #1 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,

James.Harwood · « **Reply #2 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.

swc · « **Reply #3 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.

James.Harwood · « **Reply #4 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.

swc · « **Reply #5 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

TechnoTurkey · « **Reply #6 on:** August 17, 2006, 15:26:30 »

could you have knocked the timing out a fraction?

Devon-Rover · « **Reply #7 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?

James.Harwood · « **Reply #8 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.

James.Harwood · « **Reply #9 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.

Artwigwa · « **Reply #10 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?!

mark.yellow.series.3 · « **Reply #11 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.

swc · « **Reply #12 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).

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AuthorTopic: miss firing (Read 1425 times)

swc

miss firing

mark.yellow.series.3

miss firing

James.Harwood

miss firing

swc

miss firing

James.Harwood

miss firing

swc

miss firing

TechnoTurkey

miss firing

Devon-Rover

miss firing

James.Harwood

miss firing

James.Harwood

miss firing

Artwigwa

Points

mark.yellow.series.3

miss firing

swc

miss firing