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General => General discussion => Topic started by: snifferdog on 27 February 2009, 17:43

Title: misfire!
Post by: snifferdog on 27 February 2009, 17:43

hey,i know its a dumb question but i really dont know anything about this area,but,ive been offered a car that has a 'slight misfire',ive never owned a car that is misfiring and dont know if this is a bad thing or a simple fix?! what are the symptoms and what is the worst case scenario etc? I feel slightly embarassed for having to ask this!haha,any help appreciated! thanks.  :embarassed:   :smiley:

Title: Re: misfire!
Post by: Ben Lessani on 27 February 2009, 18:03

All I can say is it will drive you mental trying to find the cause - but if your patient, you could get yourself a bargain.

Title: Re: misfire!
Post by: DarnPB on 27 February 2009, 19:28

When you go to look at the car, disconnect the HT lead and turn the engine over on the battery. What you are listening for are equal compressions, and not one cylinder 'missing' its stroke. Very difficult to explain in words what I mean.
You should hear, 'duh, duh, duh, duh'. If you hear 'duh, duh, duuuuuh, duh, duh, duh, duuuuuh etc' then you have a cylinder obviously with low compression causing a mis-fire and you walk away. If it sound even, then the chances are that its a simple cure like a plug, or a lead, and if the price is right, it may be worth a gamble.
(Don't take the piss the rest of you because of my duh, duh, duh's!) :laugh:

Title: Re: misfire!
Post by: shepgti on 27 February 2009, 19:31

Quote from: DarnPB on 27 February 2009, 19:28

When you go to look at the car, disconnect the HT lead and turn the engine over on the battery. What you are listening for are equal compressions, and not one cylinder 'missing' its stroke. Very difficult to explain in words what I mean.
You should hear, 'duh, duh, duh, duh'. If you hear 'duh, duh, duuuuuh, duh, duh, duh, duuuuuh etc' then you have a cylinder obviously with low compression causing a mis-fire and you walk away. If it sound even, then the chances are that its a simple cure like a plug, or a lead, and if the price is right, it may be worth a gamble.
(Don't take the piss the rest of you because of my duh, duh, duh's!) :laugh:

very good explanation!

Title: Re: misfire!
Post by: snifferdog on 28 February 2009, 08:27

Yeah cheers for that mate,I think i know what you mean anyway!

Title: Re: misfire!
Post by: Shady Pioneer on 28 February 2009, 10:55

Quote from: shepgti on 27 February 2009, 19:31

Quote from: DarnPB on 27 February 2009, 19:28

When you go to look at the car, disconnect the HT lead and turn the engine over on the battery. What you are listening for are equal compressions, and not one cylinder 'missing' its stroke. Very difficult to explain in words what I mean.
You should hear, 'duh, duh, duh, duh'. If you hear 'duh, duh, duuuuuh, duh, duh, duh, duuuuuh etc' then you have a cylinder obviously with low compression causing a mis-fire and you walk away. If it sound even, then the chances are that its a simple cure like a plug, or a lead, and if the price is right, it may be worth a gamble.
(Don't take the piss the rest of you because of my duh, duh, duh's!) :laugh:

very good explanation!

:laugh: :laugh: :laugh:

I didn't think anything of the "duh duh duhs" until you mentioned it at the end of your post :P

Title: Re: misfire!
Post by: snifferdog on 28 February 2009, 11:31

Well,apparently,the rocker cover gasket was leaking before and spilled oil into the spark plug wells,the gasket has been sorted now but just needs some new plugs! Sounds about right to me anyway! Still not seen the car though so i'll still check the duh duh duh's.  :grin: