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'94 Compression Issues

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Old Jun 19, 2018 | 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
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Old Jun 19, 2018 | 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?


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Old Jun 20, 2018 | 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; Jun 20, 2018 at 03:57 PM.
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Old Jun 20, 2018 | 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.
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Old Jun 20, 2018 | 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
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Old Jun 21, 2018 | 01:40 AM
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Is that tester reading kPa, not psi
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Old Jun 21, 2018 | 01:02 PM
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Originally Posted by TomU
Is that tester reading kPa, not psi
Yes its in kPa
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Old Jun 21, 2018 | 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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