2000 Chevy Astro Engine miss

Tiny
HOVERIDO
  • MEMBER
  • 2000 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 198,000 MILES
Got a miss I cant get rid of. I replaced plugs, wires, cap, rotor, coil, module and I still got the miss. It misses when it is just about to shift gears. I have also replaced the filter and fuel pump recently. I have been trying to figure this miss out for the last year. It reads code 300 and when I erase the code with my code scanner it seems to run better for a few miles then it displays that code again and it misses again. Seems to do it worse on wet days. All the ignition parts have less than ten miles on them right now. Any ideas what to check next?
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Tuesday, January 8th, 2008 AT 6:32 PM

2 Replies

Tiny
PJS47282
  • MEMBER
I had the same problem with my 98 astro, 2 things to check 1st check the crank sensor, including the wire harness where it comes in contact with the frame, I found on mine that there were 2-wires where the insolation was ware thruogh and making contact to the frame and it acted up more in the rain. 2nd would be the rotor cap make sure the center contact is not flatten out and not contacting the dis. Cap properly. I had to pull up on it to give it the spring it need to make good contact to the dis. Since I did that I have not had any issues. I hope this helps.
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Sunday, January 13th, 2008 AT 11:22 PM
Tiny
TALESIN
  • MEMBER
I had the same problem a while back, and I basically ignored it because it would come and go with no explaination or and no repair seemed to fix it. Finally the light went on for a while and instead of 0300, the code was 1345.

The distributor gears in late 90's GM engines have a tendency to wear, which throws the timing off a bit. My suspicion is that the original 0300 code was the timing starting to get loose, since that code no longer occured and was replaced with the new one. Anyway, I replaced the gear and the 1345 code went away instantly.

Pull out the distributor and check the gear, if there is any wear, get a new one. You may have to order it or go to a dealer. The big chains usually only carry the entire distributor. It's not a hard job, just make sure (with a long screwdriver) that the oil pump is at the right angle for a proper seat when you put everything back in. That advice was missing from the Haynes manual and caused me a lot of frustration
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Thursday, February 21st, 2008 AT 2:18 PM

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