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'94 Compression Issues

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Old 06-19-18, 02:46 PM
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'94 Compression Issues

Started having hot start issues with my 94 rx7 last night. Common crank but no start when hot. Put a little oil down the intake and started up fine.

Car runs fine when hot and pulls supper hard, just wont start.

Did a compression test and got these numbers, thoughts ?



Rotor number 1


Rotor number 2
Old 06-19-18, 06:58 PM
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Hi Friend - Sorry to hear about your new issue. Your compression should be near 100psi in Florida. The readings you are getting seem to indicate you are showing 0.00 psi. I apologize I can't be more help. Are you sure your tester and your test procedure is sound?


Old 06-20-18, 03:55 PM
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So I actually got the test done in Oklahoma, so 1200 ft elevation.

The thing is, the car idles and runs great, pulls super hard still, also starts cold no problem.

Last edited by Wks1510; 06-20-18 at 03:57 PM.
Old 06-20-18, 08:08 PM
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Originally Posted by Wks1510
So I actually got the test done in Oklahoma, so 1200 ft elevation.

The thing is, the car idles and runs great, pulls super hard still, also starts cold no problem.
Check out paragraph 8.1 and 8.2 of the photo. That is what I was getting at. Not the elevation.
Old 06-20-18, 09:54 PM
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Originally Posted by j a r o d
Check out paragraph 8.1 and 8.2 of the photo. That is what I was getting at. Not the elevation.
Ahh I see what you're getting at.
As far as the tester goes, I'm unsure about the accuracy of it, but I followed the procedure as stated. For how well it runs I am doubting a compression issue and am leaning towards an ignition issue...

Ill have some time to investigate this weekend, and let you all know
Old 06-21-18, 01:40 AM
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Is that tester reading kPa, not psi
Old 06-21-18, 01:02 PM
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Originally Posted by TomU
Is that tester reading kPa, not psi
Yes its in kPa
Old 06-21-18, 10:48 PM
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Took the car to a meet tonight, and it hot starts no problem, I'm leaning more towards electrical

Going to do a compression test with a mechanical gauge as well to double check the numbers.
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