So I take my '98 SE-R with 70K miles into the Nissan deaership this morning for a compression test, just to see where I am at results, and I quote:

"125PSI on all four cyln."

125? I asked the service manager and he said that it was right for "my type of engine" WTF? If I was running 125PSI on all four, shouldn't I have noticed a severe decrease in power?

The car seems like it is stronger than ever?!?!?!?? I am going to get a second opinion somewhere else, that just does not seem right....

I dug this up through searching:

"Ok, they covered about everything. Keep in mind stock compression should read 178psi. Anything from high 150s and up is acceptable as long as its consistent. If one cylinder varies by more than 10%, you may want to do a leakdown test. The compression tester needle should rise consistently to your reading. "

I am going to do some calling tomorrow and see wtf is up with this, I just do not think those readings can be right because like I mentioned, the car FEELS fine.

Thoughts?

Sounds like the motor was cold, or they didn't have the throttle open, or both. Just go buy a compression gauge, and check it yourself. There are instructions on se-r.net. Its very easy to do.

Ok here is one for yeah I brought my dad's car to the dealer for a water pump (89 toyota corolla 192k).The water pump froz. They said that the compression showed 150-0-0-150. So I said ok don't touch the car, we will pick it up. So we did . It was 145-150-148-95 #4 is weak, not head gasket or big hole in 2 pistons.I think that they where not happy doing just a water pump or wanted my dad to buy a new car? 192,000 on stock motor and tranny, can't complain

Originally posted by DenverSER


"Ok, they covered about everything. Keep in mind stock compression should read 178psi. Anything from high 150s and up is acceptable as long as its consistent. If one cylinder varies by more than 10%, you may want to do a leakdown test. The compression tester needle should rise consistently to your reading. "


Hey, I wrote that! :p

I second eric. It sounds like the TB wasn't open or the motor was cold.

Either that or your rods are all bent! jk
-Tom

You don't even need to buy a compression gauge.
Just rent one from autozone or pepboys.
If you can change sparkplugs, you can do a compression test.

I recently did this with the help of my Honda hybrid friend (no cracks please - he's the best friend any of us could hope to find), and mine read out 175 +/- 3 on all cylinders at 160k miles.

I think the carbon build-up is raising my compression :D

Originally posted by peter96
You don't even need to buy a compression gauge.
Just rent one from autozone or pepboys.
If you can change sparkplugs, you can do a compression test.

You don't have to buy a gauge, but I would recommend it over renting one. When I found out my compression was low, I had borrowed one, and it said 140 140 140 50. I went out and bought one, and got 180 180 180 90. I only paid $20 from AutoZone for it. You never know if the calibration is off on the rental ones, because people don't care about rental stuff. I used to rent spring compressors, but I was tired of getting ones that were bent. I broke down and spent $30 on a set, and I've only used them 3 times maybe, but its better than having to run to the store and rent them, then take them back.

I will post test results this weekend!

Jerrod

Originally posted by eric96ser


You don't have to buy a gauge, but I would recommend it over renting one. When I found out my compression was low, I had borrowed one, and it said 140 140 140 50. I went out and bought one, and got 180 180 180 90. I only paid $20 from AutoZone for it. You never know if the calibration is off on the rental ones, because people don't care about rental stuff. I used to rent spring compressors, but I was tired of getting ones that were bent. I broke down and spent $30 on a set, and I've only used them 3 times maybe, but its better than having to run to the store and rent them, then take them back.

What he said.... Not to mention if you ever need it again sometime down the road you don't have to go through the hassle of renting it. Plus if you buy, we can borrow it :D j/k

I made the test on my car today *** i have had the doubt for a long time since im not getting the results i really want from my car. and thanks god I made it *** i was about to buy 11:1 pistons and open the motor and stuff but my car seams great!.

it went like this.

195-195-195-190

and i haven't touched the internals nor anything so I dont know it seems very good for me.