UPDATE #2 Re: Misfire on cyl. 2

[Richard J Lebens]

Does a NF engine have electronic fuel injection.  I ask because those
symptoms sound like what happened to my 20 valve when an injector stuck
open.

--- Doug Yoder <yoderw at msoe.edu> wrote:

> Ok, after some experience driving this weekend, the car (1991 100,
> 2.3l 
> NF engine) is still running very poorly.  Significant loss of power 
> (lose ~5mph going up hills on the freeway, can't accelerate) and fuel
> 
> economy (~12 MPG!), and rough running - seems like cylinder #2 isn't 
> firing, unplugging its spark plug wire doesn't change the idle.
> 
> After about 300 miles since the new spark plugs were installed, I
> pulled 
> #2 to look at it again.  *Significant* oil fouling.
> Picture here:
> http://people.msoe.edu/~yoderw/stuff/oiled_plug_small.jpg
> (24kB, 640x480 JPG)
> 
> So I started thinking how oil could be getting into the cylinder. 
> Piston rings, head gasket, or valve seals.  Rings or head gasket
> would 
> show up on the compression test I did last week, so that leaves valve
> 
> seals.  Am I missing anything?
> 
> Another question (somewhat rhetorical, but...) is "why did this
> happen 
> all of a sudden when I changed the oil, plugs, and dist cap/rotor?" 
> I 
> checked the oil level after seeing the fouled plug, and it was a
> quart 
> too high!  Now, I know I only put in 5 quarts, because I only *had* 5
> 
> quarts... and there's only 5 empties in the garbage.  4.5 quarts came
> 
> out, just like normal.  I drained a quart out, and it looked/smelled 
> normal - no coolant or anything in it.
> 
> This evening I tried pulling the ECU codes again, and had better luck
> 
> than the last time I tried it.  One weird thing, though, was that
> once 
> the blink output was activated, the idle became very rough and the 
> engine died shortly thereafter.  Found one code: 2223 = altitude
> sensor. 
>   Anyone ever hear of an altitude sensor going bad?  I'll check the 
> wiring on it tomorrow.  It seems, however, that the oil in cyl #2 and
> 
> the altitude sensor would be *completely* unrelated problems.
> 
> Any suggestions?  Thanks in advance,
> -Doug Yoder
> 
> -- 
>
*------------------*--------------------*------------------------------*
> |    Doug Yoder    |   wdy at zordok.net   |    http://www.zordok.net/  
>  |
>
*------------------*--------------------*------------------------------*
> |  Don't tell me the sky's the limit...                              
>  |
> |                                  ...there's footprints on the moon.
>  |
>
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