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Jeep Wrangler YJ
YJ General Discussion
88 Sahara I6 - Odd RPM Issue
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<blockquote data-quote="deadpool1" data-source="post: 439510" data-attributes="member: 21229"><p>the engine is an air pump,( base)</p><p>if it can't blow air to the CAT, then you measure huge over 2psi at the 02 flange bung hole 02 pulled! test 1:</p><p>and if there is huge pressure there cat melted then test 2 fails a cheap vacuum gauge.</p><p></p><p>the engine cant even pump air, and so can not suck a vacuum on the intake side too,.</p><p>vacuum tests are so simple here, no need to spend all day dropping header bolts rusted to death.</p><p>what you would see is idle vacuum weak, then gunning the throttle vacuum goes tally crazy, first do vaccum\ tests in good engine</p><p>then do this one, see how VAC tests fail</p></blockquote><p></p>
[QUOTE="deadpool1, post: 439510, member: 21229"] the engine is an air pump,( base) if it can't blow air to the CAT, then you measure huge over 2psi at the 02 flange bung hole 02 pulled! test 1: and if there is huge pressure there cat melted then test 2 fails a cheap vacuum gauge. the engine cant even pump air, and so can not suck a vacuum on the intake side too,. vacuum tests are so simple here, no need to spend all day dropping header bolts rusted to death. what you would see is idle vacuum weak, then gunning the throttle vacuum goes tally crazy, first do vaccum\ tests in good engine then do this one, see how VAC tests fail [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
88 Sahara I6 - Odd RPM Issue
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