How do these spark plugs look?
Discussion
Hm. Ok.
I have a misfire at idle and low revs. (sub 2500)
Runs fine at higher revs. (over 2500)
Coil packs tested ok.
I cant see any physical issuses.
Only thing I have done is filled up with BP where as I almost always use Shell - but I cant see it being bad fuel as it would run badly at all revs?
Would you replace the plugs anyway - they are c.5-6 years old maybe. Done max 2000 miles.
I have a misfire at idle and low revs. (sub 2500)
Runs fine at higher revs. (over 2500)
Coil packs tested ok.
I cant see any physical issuses.
Only thing I have done is filled up with BP where as I almost always use Shell - but I cant see it being bad fuel as it would run badly at all revs?
Would you replace the plugs anyway - they are c.5-6 years old maybe. Done max 2000 miles.
They look fine but for a misfire like that I would be replacing them to see if it resolves the problem.
We use Iridium plugs in some motorbike engines and if you 'foul' one or it goes off no amount of cleaning etc will ever seem to get them back however a new set of plugs sorts the problem.
We use Iridium plugs in some motorbike engines and if you 'foul' one or it goes off no amount of cleaning etc will ever seem to get them back however a new set of plugs sorts the problem.
Open engine bay so you get a lot of water in there when it rains.
There is a gasket around the spark plug covers but its paper and the engine runs hot hot, so after a while water can get in as the gaskets are basically useless.
I do try and keep a plastic sheet to cover the engine at car shows etc but there are times it gets wet.
There is a gasket around the spark plug covers but its paper and the engine runs hot hot, so after a while water can get in as the gaskets are basically useless.
I do try and keep a plastic sheet to cover the engine at car shows etc but there are times it gets wet.
Panamax said:
Spark plugs can look fine but be failed internally. Trying a fresh set of plugs definitely wouldn't be wrong. The plugs may be old even if the mileage is modest. Are they the correct spec' for the engine?
There are spark plug testers you can buy. How much use they are I don't know.
Yep, just had a 1 year saga of trying to get my motorbike back on the road after a number of years laid up because of this. The plugs looked fine and only had a few thousand miles on them. They tested fine for resistance, but two of the four wouldn't generate a spark when they got warm. Which boggled my mind. I had taken off the airbox, the throttle bodies, cleaned out the injectors, tested all the sensors, rmoved the tank, tried to remove and test the fuel pump inside the tank. Was a nightmare and all it needed were new plugs!There are spark plug testers you can buy. How much use they are I don't know.
I had similar - stutter when below 2k rpm, clear above - one of the plugs had electrical tracking showing in the ceramic, so the arc was going around the outside. Cleaning the ends of the leads and outside of the plugs temporarily sorted it, new set of leads and new plugs properly sorted it.
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