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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
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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1988 oldsmobile ninety eight only running off of four cylinders instead of six and its not the coil pack

If you replaced only the coils, and not the module beneath, you wasted your time. Most times the module is what causes this.

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1990 Oldsmobile Ninety-Eight Regency Brougham

if you are not experienced mech. maybe you should take it to one

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Hello wrygrl...The OEM (orginal equipment) passenger side motor mount for the 1988 olds ninety-eight was a hydraulic type. After market "solid" type mounts are available for replacement...either type will work. Shop around and get some price quotes, i believe westar makes a solid type mount that sells for around 22 bucks.
Hope this answers your question. Have a safe and happy memorial day weekend.

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What color smoke out of the tailpipe ? Black - running rich , too much fuel or not enough air . Blue smoke - burning oil , piston rings valve seales , white smoke could be two different thing's - coolant in the cylinders or fuel going stright through the cylinder out the tailpipe . No combustion .
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