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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 05-25-2020, 10:19 AM   #1
spools420a
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Can someone look over this video and results with me about vacuum test/compression

Note this is my gf 2004 kia rio but the kia forums dont have as much skilled eople as zilvia.The car has a misfire around idle I have been chasing and trying to fix.I did a vacuum test and compression test to see if the engine is ok.

heres the vid of the vacuum test
https://www.youtube.com/watch?v=SY34...ature=youtu.be

So with a/c off it seems good,we see 22in of vaccum BUT when the a/c kicks on we start seeing 15in of vacuum?when the a/c is on is when the car shaking seems worst.I do see very slight fluxuation of the needle but its so slight I dont see it as a problem.

the compression test results
dry
1# 150
2# 149
3 143
4 #150
wet
1# 182
2# 175
3 170
4 180

with this said can I rule out the engine low compression being the cause of misfire?
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Old 05-25-2020, 10:36 AM   #2
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Replace coil packs, wires and plugs....there cheap and will resolve the problem.

Yes ur compression is just fine
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Old 05-27-2020, 03:30 PM   #3
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yep sounds like needs a tune up and a cleaning
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Old 05-29-2020, 10:23 AM   #4
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+1 compression is good...hows the leakdown?
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