MY 400 PONCHO ENGINE IS CRANKING BUT WON'T START

  • Tiny
  • tyrfryr
  • 1979 Pontiac Trans Am

This is what I have tried/checked. First off I built the engine myself. I am just stumped!
Compression is great! Spark is great! Plugs are great! Fuel is great! Battery is Great! Starter is great! Turns over great but won't start! What am I missing. Never came across this problem in the 12 years since I built it. The engine only has about 5,000 miles on it.

Tuesday, September 4th, 2012 AT 7:10 PM

3 Answers

  • Tiny
  • hmac300
  • Expert
  • 43,007 posts

Check to see if you have compression and then if it's jumped time. The timing chain may have slipped.

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Tuesday, September 4th, 2012 AT 7:14 PM
  • Tiny
  • tyrfryr
  • Member

It has timing gears. All is fine there too.

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Tuesday, September 4th, 2012 AT 7:39 PM
  • Tiny
  • hmac300
  • Expert
  • 43,007 posts

Then if everything is great it should run. Check your compression and then go to the site under tune up on how to check your ignition system. Something has to bewrong if it doesn't start. How much fuel is coming to carb you shold have ahalf a pint or so with about 3 or 4 cranks. Does it have good pressure?

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Tuesday, September 4th, 2012 AT 7:42 PM

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