misfire

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Discussion

oldboyracer64

Original Poster:

209 posts

245 months

Friday 24th December 2010
quotequote all
ok please list anything that could cause a misfire asap please as i need to fix tomorow thanks david

Ben Magoo

547 posts

229 months

Friday 24th December 2010
quotequote all
My favourite is point's, condenser and more recently the coil.

It's very much a case of trial and elimination, start with the very basics:

Sparks - Remove a plug one at a time, check it's condition - there is a dedicated page in Haynes manuals. Once satified it's servicable, clean it anyway, check the gap then hold the plug body (metal part) against a head stud and turn the engine over to check for a nice strong blue spark.

If you find a plug not sparking nicely, try it at another lead position to see if the plug is at fault or your problem lies further down the circuit.

If you find the plug fires ok in other positions try the same method to test the lead.

Failing that it's time to look at the condition of your contact breaker points, again there is a specific section on this in the Haynes book. (I understand there occasionally is some snobbery over using Haynes books etc but in fairness it's never steered me wrong)

After this it's time to concider changing parts - recently I had a total ignition failure, the coil was at fault and when I removed the HT lead from the top a load of oil poured out!

Faulty coils can kill condensers - I replaced all three (Coil, Condenser, Points - all genuin Lucas parts for less than £30 from my local Parkinsons)and she's singing again smile

HTH?


oldboyracer64

Original Poster:

209 posts

245 months

Saturday 25th December 2010
quotequote all
think its sorted number one lead no good thanks