Question about 1992 Chevrolet C1500

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Ruff running engine.

Engine has a miss at lower rpm's but runs very smooth at 65 mph plus. Plug, wires,distributer cap and rotor and in linegas filter all replcaed. still the miss is there.

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Did you check the plug gap before you install the plugs they all should be set at .035 of an inch. do not trust that they where set at the factory someone may have drop the box or the same plug may fit other years. I have seen this happen a lot. it is also possible that you could of gotten a bad plug.

If this don't help I would need a little more information, is it TBI fuel system or multi-port injected and engine size.

Posted on Nov 10, 2008

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Posted on Jan 02, 2017

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Hi I am in afghanistan and i got a Kia with a toyota engine, they got me a new distributer cap but the numers are difrent from the first one it had on, i hade to change it the old one was broken, i put the...


First thing is to ck for a spark, see if she has good spark. Next remove the cap and watch the rotor button as it turns, have someone crank the engine to see, looking for which direction. Next turn the engine by hand looking for any marks on the crankshaft pully. aligning any marks should be #1 or #4 piston firing position. you will have to do this trial and error. Next if your rotor buton turns to the left align the marks on your pully and put your # 1 plug wire at the port in the cap which the rotor button is pointing at, then next put the #3 plug wire in,next #4 and last in turn would be #2. The firing order is 1,3,4,2.which ever direction the rotor button turns. if it starts and runs ruff you are out of phase 180 degs. move the wires two ports in the cap as the rotor turns. 

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Hello lendor9 and thank you for choosing fixya.com

I suggest making sure the cap and rotor (if distributed) are good. If it has a coil pack and modular, have the coil pack(s) tested - when taking the coil pack(s) off - look at the top of the modular, and look for damage such as bubbles, like it has been boiling - black or white residue - if any of this exit, replace the modular. Also replace any coilpack(s) as needed. Be sure that the wiring harness for the modular is screwed in and secure. Have a diagnostics test done on the car to determine any codes that will reveal THE, or any other problems. You may need to replace the O2 sensor(s), as well as the air and fuel filter.

I hope this information is useful in getting your truck running smoothly again. Thank you again for choosing fixya.com
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