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very, very, very random misfire

 
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Old 07-14-2011, 01:37 AM
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very, very, very random misfire

Yes, i have searched this, but im not sure if those descriptions and possible causes fit the randomness of the occurence.

89 2.0 si, and about a month ago, in first gear it briefly misfired and sputtered around 2000 rpm before it finally decided to go. ive done a complete tune up, (minus the fuel filter), ran a half a can of seafoam to a fillup to clean the injectors, and changed the oil since then.

It did it again tonight, this time in 2nd gear, so ive ruled out tranny or clutch so far, the distributor timing is probably off a hair because it doesnt feel as giddy as it should (compared to my friends 88).

it doesnt burn ANY oil, and has NO check engine lights (amusing for a car so ugly...)

im thinking maybe fuel filter (which i have i just havent had the time to put it in), or possibly coil. ive read it could be distributor, but i would think it would do it more steadily instead of have a monthly menstrual cycle (its only done it twice since i got it 2 months ago, both times a month apart). Im gonna have the timing belt, water pump, and valves adjusted in a couple of weeks, hopefully that fixes it, but input would be GREATLY appreciated, as this car is a depended-on daily driver, as well as i drive long distances for work.

Thanks, and apologies for the long post, but i like to give details so people have a good idea whats going on for return advice
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Old 07-14-2011, 01:50 AM
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Re: very, very, very random misfire

It could be simple as replacing the fuel filter, or even perhaps just replacing an o2 sensor(s). I'm always wary about the fuel pump as it's still probably the original on the car.
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Old 07-14-2011, 04:33 AM
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Re: very, very, very random misfire

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Originally Posted by Prelude13 View Post
It could be simple as replacing the fuel filter, or even perhaps just replacing an o2 sensor(s). I'm always wary about the fuel pump as it's still probably the original on the car.
yeah, i wouldnt totally rule that out i suppose (fuel pump) , but like i thought with the distributor, i would think it would be more steadily doing it, and i wouldnt think a dying fuel pump would last 2 months...
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Old 07-14-2011, 11:28 AM
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Re: very, very, very random misfire

Did your tune-up include Plugs and wires? Rotor?
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Old 07-14-2011, 05:23 PM
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Re: very, very, very random misfire

My '90 Si (B21) does something very similar but typically a little higher on the rpms, say closer to 3k in first gear. I've done a complete tune up (plugs, wires, fuel filter, etc) including valve adjustment, oxygen sensor, as well as a new fuel pump. It's definitely extremely random about when its going to do it and I noticed that if I change gears into second or even simply push the clutch in for a moment it goes away. I'm starting to think maybe my oem coil is getting wimpy or a sensor is starting to wane and has developed a sparser functional range or something along those lines.
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Old 07-14-2011, 08:03 PM
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Re: very, very, very random misfire

For a car so ugly? Haha, the 3rd gens aren't pretty, i agree, but give em' the benefit of the doubt.......
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Old 07-17-2011, 03:35 AM
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Re: very, very, very random misfire

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Originally Posted by Miyagi637i View Post
My '90 Si (B21) does something very similar but typically a little higher on the rpms, say closer to 3k in first gear. I've done a complete tune up (plugs, wires, fuel filter, etc) including valve adjustment, oxygen sensor, as well as a new fuel pump. It's definitely extremely random about when its going to do it and I noticed that if I change gears into second or even simply push the clutch in for a moment it goes away. I'm starting to think maybe my oem coil is getting wimpy or a sensor is starting to wane and has developed a sparser functional range or something along those lines.
the tuneup included everything, except the coil. it hasnt done it in the past few days, but i changed the fuel filter and it still did it, so ive narrowed it down to either coil or distributor.

and antirice, if youve only seen my car you would know by how ugly i mean lol. one of the previous owners took a massive hit off of a crackpipe and decided that putting duct tape all over the car and removing the clearcoat would "make it shinier" . Plus its got the rust spot on the hood from our exhaust manifolds being RIGHT underneath that spot, plus im missing my trunk innards, fan speed knob, no stereo, clear coat peeling ALL OVER the car.... i could go on.
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Old 07-17-2011, 09:20 AM
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Re: very, very, very random misfire

Valve adjustment perhaps?
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