WK1 Troubleshooting / Problems Discussion / Dealer ServiceIf you are having some problems with your Jeep Grand Cherokee SRT8 and need assistance in troubleshooting and diagnosing the problem, this is the proper place to discuss it. Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.
I did some searching and could find much on here about doing this test. this test can tell us more then what we read on a trinity perhaps. it seems easy to read but the issue is what should our readings be if all is ok?? I bought a vacuum gauge because I feel like my engine sounds strange at idle and im not getting any codes. ill finally be pulling the trigger on a Prochager setup and wanna make sure im at top notch shape before installing some real power. I did some google search but the numbers they say u should see i dont think pertains to our engines. perhaps the experts can chime in hear and maybee give some insite so us wanna be gearheads can 1) learn and become gearheads lol and 2) do out own tests and watch to see how our engines are running. so what numbers should we be seeing at idle?? I did a quick hook up and only did a test at idle and it was reading pretty much at 15inhg with very little wobble. are there different readings when ur cammed? blown? stock? heads? tuned? what rpms should we be reving to and reading at to do a full tes? 4,000 5,000 6,000??? experts please chime in
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2010 silver Jeep SRT8 W/ opts 1 and 2 W/ performance audio and nav
Performance: Eibach pro kit ~ bwoody endlinks ~ vreds ~ StopTech pads ~ DRT crossdrilled rotors ~ Bwoody CAI ~ MM 87mm TB ~ MM stage II intake manifold ~ PWR220 Camshaft ~ kooks custom headers w/high flows and borla "S" ~ 180* T-stat ~ BT catchcan ~ zeitronix wideband a/f gauge ~ DS trinity ~ Mtcm ~ ready to install my BB torque converter ~ Tooned by Johan (the toona)PB.. 12.13@110
inhg is negative so , yes. While driving it will get closer to 0, add boost and it goes positive. Not sure what happens when idling and higher RPMs Haven't really looked at it. The key is the idle.
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i only ask about the higher rpms because of a chart i waqs reading on goodle and about how the needle moves and where it moves to.. but as long as at idle we are sitting at the same measurement there should be no problems as far as bad rings.valves etc etc...?
im gonna do some more testing at higher rpms tomorrow just to investigate.lol. i will post back what i see and try to find what the readings should be for the rigs with a cam as i cant test a stocker unless jose srtateu2 lets me run a test on his at higher rpms
U guys who ran the test with a cam in, is ur needle sitting still when testing or is it shaking back and forth in a very very small span like 15-15 1/4??? Got any video? If so please post um up for some to see
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vacuum gauge test
2010 silver Jeep SRT8 W/ opts 1 and 2 W/ performance audio and nav 
~ Tooned by Johan (the toona)PB.. 
2006 Jeep Grand Cherokee SRT8
Linear Mode
