Low compression on passenger side

RALPH CRABTREE

MEMBER
2007 NISSAN XTERRA
4.0L
V6
2WD
MANUAL
149,000 MILES

Compression tests revealed that the passenger side was 90lbs on number one, 100 lbs on number three and 95 lbs on number five.
What is the cause of this, and will trying a product like Engine Restore work for me in this case? Thank you

Thursday, January 3rd, 2019 AT 7:21 AM

5 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

There is nothing you can add that will bring back compression.

https://www.2carpros.com/articles/the-reasons-for-low-compression

There are three different chains that keep the engine in time. it is possible that the chains are worn or the guides are worn allowing the engine to go out of time.

https://www.2carpros.com/articles/how-a-timing-belt-works

The front cover will have to come off to verify all the settings for the chains to be sure they are correct. if all that is okay, then it is most likely a internal failure such as burned valve, worn piston rings.

Roy

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Thursday, January 3rd, 2019 AT 7:40 AM

RALPH CRABTREE

MEMBER
2 POSTS

I do not like this answer because the timing chains on the vehicle are okay and also both VVT valves have been done. But still only 90 and 95 lbs compression on one side.

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Friday, January 4th, 2019 AT 5:51 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, sorry, I base my answers on your input. Low compression on one side has timing in common.

I guess you removed the cover and verified but somebody missed something.

Happy New Year.

Roy

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Friday, January 4th, 2019 AT 6:05 PM

RALPH CRABTREE

MEMBER
2 POSTS

The problem is solved. I added one can of Engine Restore and vehicle smoked when cold for two days (cold start). I have been driving it for two days now and it is running great with no blue smoke at all and compression is definitely up.

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Sunday, January 6th, 2019 AT 12:09 AM

ASEMASTER6371

MECHANIC
52,797 POSTS

Good, glad to hear it.

It will return at some point as that stuff is temporary at best. The issue is still active and just masked by this additive.

Roy