my 1992 chevy S-10 runs bad after I changed the spark plugs

10

Asked by Jun 25, 2017 at 05:16 AM about the 1992 Chevrolet S-10 2-Door Regular Cab

Question type: Maintenance & Repair

I changed the spark plugs and wires on my 1992 Chevy S-10 and now it runs
really bad.  Any ideas what could be causing this?

4 Answers

72,365

Double check your spark plug wires. Make sure they're going to the correct spark plug on each wire. If they got mixed up, the engine will run poorly. For a complete tune up the distributor cap, and distributor rotor should be replaced as well. HTH. -Jim

10

Also make certain each plug wires "snaps" or "clicks" into place completely. If they are not on completely the engine will run rough because some of the cylinders are not firing. As the gentleman said above, it is critically import that the correct wire go to the correct plug. Otherwise the engine will fire out of sequence. On the distributor cap should be a set of embossed numbers, each number representing each of the engine cylinders. 1 is cyl. #1, 2 is cyl. #2 and so on. (IN MOST CASES, NOT ALL)The sequencing usually runs left to right, 1, 2, 3, 4.... The shortest plug wire usually runs from #1 on the distributor cap to the 1st spark plug in the engine block closest to the cap. The second longest wire runs from the #2 on the distributor cap to the second spark plug closest to the cap in the engine block. The third longest plug wire runs from the #3 on the distributor cap to the third closest spark plug in the block. Follow this train of logic until all of the wires have been replaced. if you ever do this again, its best to replace one wire at a time so the sequence doesn't get out of order. Replacing the distributor cap and rotor is very easy. Take the old distributor cap off. Pull the distributor rotor straight up and off the center of the distributor. Then replace the old rotor with a the new rotor, and place the new distributor cap back on. Done. These parts are usually pretty cheap too. Good luck!!

1 of 1 people found this helpful.
10

I did replace one wire at a time so that the sequence did not get out of order. I guess I'll try replacing the distributor and see if that works. Thank you.

2 of 2 people found this helpful.
72,365

Double check those wires anyhow. I always do a tune up the same way. Each plug and plug wire individually. But one time I somehow got two wires mixed up when tuning up a '70 Pontiac that I had years ago. If that's not the case, you may have gotten a defective spark plug. It may have been dropped or something during shipping to the store and has a hairline crack in the porcelain. HTH. -Jim

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