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Sounds like misfiring after driving for a while

Tiny
SCOTTDA
  • MEMBER
  • 1977 NISSAN 280Z
  • 170,000 MILES
I have a 1977 280Z with orginal engine and approx 170K miles. Starts when cold, but dregrades to a misfiring sound or less than 6 cylinders after driving at freeway speeds. Must cool down before normal start up again. Sometimes this takes a day. Could this be "heat soak" on coils, airflowmeter issues, or California Gas? Can anyone help with this probelm?
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Tuesday, April 30th, 2013 AT 8:05 PM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
I would start with checking coil plugs and ignition leads, and if it still has a points ignition check that as well including the carbon brush in the dist cap.
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Wednesday, May 1st, 2013 AT 2:27 AM
Tiny
SCOTTDA
  • MEMBER
  • 2 POSTS
Thanks. I'll check the coil plugs and ignition leads. Its an electronic Ignition.
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Wednesday, May 1st, 2013 AT 12:00 PM
Tiny
MHPAUTOS
  • MECHANIC
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Make sure that the dist cap is ok, no tracking marks, and let me know how you fair.
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Wednesday, May 1st, 2013 AT 2:08 PM

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