Question about 1998 GMC Jimmy

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Number 2 spark plug

Service engine light on . code reader said number 2 spark plug not firing properly in my 98 gmc jimmy . also something with tranny with not any details . please help .

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You need to have your jimmy checked on a obd2 hand held computer,it will give you more and better info on any sensor or problem,like your code reader stated #2 spark plug not firing properly,that doesn't even exist.
it should say misfire on #2 cylinder.
Then you can come back and give the exact code numbers like P0123 ,and we can figure this out.

Posted on Dec 11, 2009

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Are you sure it's the spark plug that's faulty or the ignition wire?? How old are plugs and wires?
If you don't know if it's your spark plug not firing or your ignition wire you could move spark plug to number 1 then check your code reader.
Or you could do an ohms continuity test on your number 2 ignition wire to verify that there is no break in the wire. Common problem to check for. If wires and plugs are old and high mileage maybe should change all including cap and rotor on distributor. Fresh wires plugs cap and rotor always improve mileage and performance.
Good luck, sorry can't help with tranny.

Posted on Dec 11, 2009

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Well, Spark Plugs wear over time,seldom fail to fire
A worn or dirty rotor and cap will still fire, also

You never throw new wires at it,I don't,mine last 18 years,
on all vehicles

You need some OBD2 knowledge,start studying

The PO302,last # is the cylinder
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If you got individual coils, go there
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For the 1988 GMC Jimmy 2.8L V6:

Firing Order:
1-2-3-4-5-6

Cylinders:
.......(back).......
|..5..|........|..6..|
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Distributor:
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Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

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If you have all 3 then move on to injector pulse to both injectors.

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