1990 Nissan Truck Not at full power

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.

Friday, January 8th, 2010 AT 10:20 PM

4 Replies

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

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

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

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