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Compression test results?


This is a discussion on Compression test results? within the Performance Mods forums, part of the Viper Truck SRT-10 Discussion category!
Originally Posted by mopar-or-no-car 25% WOW. That is high MA Mopar. Shame on you And not less than 100 psi? ...



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Old 01-11-2018, 12:18 PM
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Originally Posted by mopar-or-no-car View Post
25% WOW. That is high MA Mopar. Shame on you
And not less than 100 psi? Shit I hope not. It's obviously a generic spec they throw at all models because each car says the same thing in tech manual.

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Old 01-13-2018, 06:01 PM
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175 psi

When inought my truck at 80,000 miles it tested 165-175 psi on all cylinders.
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Old 01-14-2018, 10:45 AM
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Quote:
Originally Posted by Super Dave View Post
When inought my truck at 80,000 miles it tested 165-175 psi on all cylinders.
Exactly where it should be!
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Old Yesterday, 08:33 AM
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I've spent this summer/fall/winter doing some restoration on my 170K mile truck. New paint overall but lots of mechanical replacements. I've been collecting OEM new parts the last couple years as many of our suspension, water pumps, injectors etc are getting hard to come by. Just finished up the engine bay (last thing) and decided to do a compression check... Darn thing was 170-175psi across all the cylinders. It still doesn't burn any oil.

On a negative note; truck has an inconsistent idle now when cold. Once it warms up its rock steady. I had the intake manifold off to replace coils/wires. Did new injectors, valve cover gaskets, intake gaskets, water pump etc. First thought was intake leak, however, the design/gaskets used makes it almost idiot proof. Suggestions? Except for that one bolt pulling the intake isn't that big a deal.
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Old Yesterday, 08:45 AM
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A few things if I may ask....

Nice Compression #'s!!

What oil / filter have you been using and how often do you change it? Also, how often do you start it?

When it comes to inconsistent idle, have you addressed your O2 sensors in the exhaust?

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Old Yesterday, 09:05 AM
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I agree, O2 sensors degrade and are often overlooked as part of an engine build or freshening. Assume you're running stock 438 Champion? If not we found your Miss
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