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1988 oldsmobile ninety eight only runs rough @backfires

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Worn Timing Gear & jumped a tooth or two
Check that out
If you rock the crank back & forth with a long
ratchet,with the distributor cap off & the rotor
doesn't move right away then you maybe on to that issue
The fix is to remove the side subframe bolts & lower it
enough to get your puller on & the damper off
You could try using a timing light on # 1 wire &
then on the one half way thru the firing order
The timing should be close with either
Crack the throttle & watch the reaction of timing
light
Point here is backfire is most likely some type of
timing issue,could be combined with other issues
that contribute
I assume the spark plugs are not more than 3 years old
& you have cleaned up the rotor & cap
The plugs wires last some times 15 years,but not forever

Posted on Jul 23, 2013

  • Anonymous Jul 23, 2013

    How old is the exhaust converter? 14 years or more & your keeping the car I would replace it & the O2 Sensor

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Posted on Jan 02, 2017

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