I have had this problem for a few weeks and finally nailed it.
Google was of no help what so ever.
Things I tried.
First which cylinder was not working. Started engine, took each lead off the spark plug, number 1, 2 and 3 all caused the engine to falter more, then number 4 had no effect on engine. Changed the plugs, coil, leads no difference. Shorted the plugs on the rocker cover, all fired fine but I did notice number 4 plug was covered in unburned fuel. Did a compression test which was fine. Finally changed the injector and all was fine.
NA8 Only Firing on 3 Cylinders
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myredmx5
- Fast Driver
- Posts: 498
- Joined: Fri Mar 02, 2012 5:13 pm
- Vehicle: NA8
- Location: Newcastle Area NSW
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manga_blue
- Forum Guru
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- Vehicle: NA8
- Location: Moruya, NSW
Re: NA8 Only Firing on 3 Cylinders
Textbook diagnosis. Mind you, if the injector check didn't work you would have got to looking for a dead mouse in the inlet tube. 
’95 NA8
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myredmx5
- Fast Driver
- Posts: 498
- Joined: Fri Mar 02, 2012 5:13 pm
- Vehicle: NA8
- Location: Newcastle Area NSW
Re: NA8 Only Firing on 3 Cylinders
manga_blue wrote:Textbook diagnosis. Mind you, if the injector check didn't work you would have got to looking for a dead mouse in the inlet tube.
No mouse just clogged or dead injector.
When replaced all worked fine.
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