Question about 1990 Geo Storm

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What will make the #1 and #2 spark plugs to foul out? Parts that are new:Plugs,wires,cap, rotor,coil, pickup coil.Cleaned the intake with Sea-Foam, that's what made it run better, but only #1 and #2 plugs that are fouling with dry carbon., and the compression is 160 in all 4 cylinders.I haven't changed the fuel filter, and I notice that there was a crack in the exhaust manifold in the area of those two cylinders, don't know if that would foul them out.

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I would go for the fuel injectors. Dry carbon, being black(to much fuel) or white (to little fuel). Both lean to the injectors. Clogged or open. My guess would be black. The crack would really only cause a O2 sensor fault, sucking air, that could cause a white burn on the plugs, to lean. Have the codes read..

Posted on Nov 30, 2014

Testimonial: "yes,#1 and #2 has a tiny amount of white, but both are covered in black dry carbon., plugs #3 and #4 are fine."

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Why not post engine type.
1990 is really a Isuzu Impulse
and with a 1.6L 4XE1 (isuzu engine it is)!!
SOHC engine (single cam)
and what Fuel and spark systems, (we need this to THINK, cause)
did you try the jumper codes yet.

do not ignore the cam belt or boom , end of road, and bent valves.
Multipoint EFI

id say 2 leaking injectors, get them pro cleaned,(off car)
untra sound back flushed.

next is spark but not really spark is always first , after bad engine.
compression good so , spark.
so what spark is there.
you did a tune up!~great. are the spark plug wires reversed? at 1 and 2.
did you check spark timing carefully, or just guess?
is this some cheap china no name rotor that fits on 3 ways.?
and if wrong makes spark (CMP) right but lands in the wrong post in cap? rotor error......
use BOSCH rotor, or NGK,? bam good.
my guess , is spark, is good, but i use tools to prove that. not guess.
if true then its pure fueling issues on only 2 injectors
and if true the solutions are only 2.
get them cleaned
or buy refurbs. (can be less than $21 clean x4)
clean all 4, no just 2.

these injectors have 10 micron screens inside,
and need to be clean,. and the car is old, what makes you think
any old 24year old injector can work right>?
i send mine here,

Posted on Dec 07, 2014


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