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Engine vibrates a lot at idle.

Tiny
KRAZZYKEVIN
  • MEMBER
  • 1986 NISSAN TRUCK
  • 4 CYL
  • 2WD
  • MANUAL
  • 77,000 MILES
My truck (a nissan 720) has the 2.4l Z24 engine with carburetor and lately it idols at around 1200 RPM, which higher than it should I believe, and it intermittently vibrates fairly intensely, enough to shake the stick back and forth and make things shake inside the cabin. It does this every 10 or 15 seconds or so. And if I rev it up then sometimes it drops way low to like 200 RPM and almost dies if I don't give it some gas. I just changed the spark plugs, oil, and air filter, I replaced the OEM filter with a K&N. What might the problem be? Any help is appreciated. Thanks.
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Thursday, August 27th, 2009 AT 12:27 PM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

This sounds like you have a vacuum leak somewhere in the engine lets start by following this guide to see what you find.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please let us know what you find.

Cheers, Ken
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Wednesday, February 14th, 2018 AT 8:54 PM
Tiny
MARK C
  • MEMBER
  • 1 POST
I wanted everyone to know this problem was the gasket under the carburetor had gone bad once I replaced it the truck runs great again.
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Wednesday, February 14th, 2018 AT 8:55 PM

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