Question about 1989 Chevrolet C/K 3500

1 Answer

3 and 5 dont always fire

I have a chevy 305 with 283 heads on an engine stand at school. it is all put together and we got it started but cylinders 3 and 5 dont always fire when they are supose to so if you dont keep pumping the throttle it doesntget enough to keep the engine running. it is timed just as its supose to be with firing order 1-8-4-3-6-5-7-2 and pointing at number one cylinder. all of the plugs are good and so are the plug wires. the module in the distributor is the correct one. why might this be happening? i would very much appreciate an answer as the school year is almost up and i need to bring the truck and engine home within a few weeks. thank you

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  • Anonymous May 17, 2009

    thank you for replying to my problem with the chevy 305 mechanicm639 about clyinders 3 and 5 missfiring. i have not yet checked the tightness of the valves or the compression since the rebuild but i do remember that the compression was around 190-200 range for all of the cylinders. is that a big difference? also we have been turning the distributor while it has been running to try and advance or ****** it to try and get it to fire right and no luck thus far. i will be sure to check the valves and compression next day at school on monday. i appreciate the help very much and ill try and remember to give u an update on how things go. thanks again!

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Two things are able to be your issue. Either you have the valves too tight on those two cylinders. You can check the compression to see if that is the case. Or you may have the wires crossed, it is very easy to do. I have been a pro tech for over 20 years and it will still happen once in a while. Also how does it spin over? Does it drag like the timing may be off? If you can't keep it running then you have not set the timing yet right. If your wires are not crossed, and your compression is ok then have some one move the distributor while you keep it running and see where it does best. Good Luck.

Posted on May 16, 2009

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