1990 Nissan Truck Not at full power

Tiny
LOAF22
  • MEMBER
  • 1990 NISSAN TRUCK
  • 4 CYL
  • 4WD
  • MANUAL
  • 15,000 MILES
It feels like its not hitting on all cylinders. The engine is shaking at idle and you can just here it missing. Sometimes when I drive it down the road it will kick in and have full power. I have changed the distributor cap and rotar, new plugs and wires. I dont know what else it could be, any help would be appreciated.
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Friday, January 8th, 2010 AT 10:20 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the IACV/AAC valve and PCV and EGR valves and TPS and Airflow meter.
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Friday, January 8th, 2010 AT 10:37 PM
Tiny
LOAF22
  • MEMBER
  • 3 POSTS
Thanks rasmataz I tested the vavles you told me to and they all checked out ok. I had a guy tell me that it might be a "weak coil" could this a possibility?
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Sunday, January 10th, 2010 AT 9:22 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be the coil-check the coil's primary and secondary resistances and also the distributor pick-up coil and for a vacuum leak
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Sunday, January 10th, 2010 AT 3:34 PM
Tiny
LOAF22
  • MEMBER
  • 3 POSTS
Thanks rasmataz, I checked the coil and it was ok. I believe that I have found the problem. I checked the compression and heres what I found
cylinder #1 70lbs
cylinder #2 70lbs
cylinder #3 70lbs
cylinder #4 110lbs
Standard is 192lbs
Minimum is 142lbs
By the way this is a Four cylinder KA24E engine. Now I guess my next question is what would be some possible causes for this, and what would be my next step/s? Thanks
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Wednesday, January 13th, 2010 AT 4:58 PM

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