OUT OF THE BLUE STARTED HAVING A ROUGH IDLE

  • Tiny
  • Anonymous
  • 1984 Nissan Truck
  • 140,000 miles

Out of the blue, started having a rough idle. Had to increase the idle to around 1000 rpm's just to keep it running.
Found several vacuum hoses with cracked ends and replaced all one at a time. Removed the pcv valve and cleaned and tested, works fine. Used carb. Cleaner to clean carb and it stopped idling rough for a few minutes and
then went back to rough.

Check distributor and plugs.

Any thoughts?

Sunday, October 21st, 2012 AT 10:23 PM

3 Replies

  • Tiny
  • rasmataz
  • Member

Sounds like a Carb problem-replace the base gasket and see what happens-also is this a Z24 NAPZ engine

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Sunday, October 21st, 2012 AT 10:35 PM
  • Tiny
  • Mr. Tyler
  • Member

Yes, Z24. Also checked the pcv valve yesterday and the egr valve. Both are good. This truck
does have a VVT (venturi vacuum transducer valve) which feeds the egr.

If I spray carb. Cleaning into the VVT, it seems to run normal for a minute. Also, if I spray
carb. Cleaner at the base of the carb. At the back of the unit the engine tries to die.

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Sunday, October 28th, 2012 AT 4:17 PM
  • Tiny
  • rasmataz
  • Member

Replace the base gasket than report back-try to die, when sprayed -it shouldn't do that if its not leaking-nothing will change-Let me know

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Tuesday, October 30th, 2012 AT 12:50 AM

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