Question about 1984 Oldsmobile Cutlass

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On hard excelleration poping or back firing

78 olds with 138,000 mi. new timing gear at 70,000 always maintained. Checked wires dist. cap rotor, some wear but nothing major, plugs replaced about 2 months ago!!!!?????? What is happening?

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  • 193 Answers

If its back firing you may have put the plugs back on in the wrong order, the firing order should be printed on your manifold xheck them and see if it does the trick.

Posted on Jun 20, 2009

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Posted on Jan 02, 2017

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I would recheck the firing order for the plugs as that will be the cause of the back firing
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Is it possible to turn the distributor shaft 180 degrees and reinstall the dist ?
I am assuming you have spark at the plugs, just not at the right time ?
If the distributor has not been moved, and the rotor points to the wrong wire, you could have put the cam gear in upside down ?

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It sounds like u have a cam correlation problem... Take ur cap off mark where ur rotor is pointing on the dist. Mark the firewall where the dist plug is pointing take the 10mm bolt out n look @ the dist gear and see how bad it's worn!! When u take the cap off some times they're so bad when u move the rotor u can tell the excessive play hope this helps!!!!

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I HAVE A 1988 CHEVY VAN G20 5.7 I CHECKED TIMEING CHAIN NEW PLUGS,PLUG WIRES,DIST CAP, ROTOR,COIL,FLUSHED FUEL TANK,NEW FUEL PUMP AND FILTER I HAVE GOOD FUEL PRESSURE,GOOD COMPRESSION,THE PROBLEM IS SPARK,...


1/ Have you fitted the spark plug leads in the proper firing order.
2/ Look inside the top of distributor Top (this is not the first time a new distributer cap has very small crack) or the rotor arm is fitting the cap properly. Hope this helps Best Wishes, Malcolm Campbell.

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Replace the spark plugs and wires along with a distributor cap and rotor. Be careful to leave the old wires and plug wires connected to dist.cap, just remove dist. cap from the distributor and lay aside with plug wires on it then install rotor then new cap and proceed to replace each wire for cap and spark plug one at a time so you don't mix up the spark plug wire firing order. Cap laying to the side is used for reference purpose.

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