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Be careful of the "unplug it" test of a MAF sensor! Just because fuel trims normalize, does not always mean the MAF is the issue. This clip was pulled from a recent SD Premium video on my website. | ScannerDanner
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Fuel psi is in spec at idle. Is that good enough of a test? ABSOLUTELY NOT! Weak Fuel pumps can keep up during times of low volume (idle), so psi must be tested during high volume conditions. 1. snap throttle to wide open/redline RPM and make sure psi doesn't drop during the rev 2. also check for a bleed down issues https://www.scannerdanner.com/join-scannerdanner-premium.html | ScannerDanner
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Identifying a Vacuum Leak Using Fuel Trim at Different RPMs | ScannerDanner
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