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SVTPerformance's Chain of Restaurants
The Market
Vehicles For Sale
2011+ Mustang GT and V6 Buy/Sell
2011 Grabber blue modded 5.0, low compression #8 cyl
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<blockquote data-quote="SVT_SRT8" data-source="post: 11006868" data-attributes="member: 104502"><p>Hvae you data logged and emailed to your tuner? Something could be wrong with the global spark in the #8 because of your tune. "adjustable by the tune. Also 6% doesn't seem like a big deal As a rule, most engines should have 140 to 160 lbs. of cranking compression with no more than 8-10% difference between any of the cylinders. Your plug was probably fouled because of your a/f is rich so I think a re-tune may help you. There are cheaper alternatives to test before selling your car.</p><p></p><p>From Yahoo Auto's</p><p></p><p>if compression is low in one or more cylinders, you can isolate the problem to the valves or rings by squirting a little 30 weight motor oil into the cylinder through the spark plug hole and repeating the compression test. The oil temporarily seals the rings. If the readings are higher the second time around, it means the rings and/or cylinder is worn. No change in the compression readings tells you the cylinder has a bad valve.</p><p></p><p>Your dealer could probably do this:</p><p></p><p>With electronic testing, a computer analyzer "estimates" compression in each of the engine's cylinders by measuring slight variations in engine cranking speed. The results correlate well with actual gauge readings and can be completed in a matter of minutes without having to remove any spark plugs. What's more, the analyzer prints out the results of the compression test making it easy to see and compare the actual numbers. </p><p></p><p>If you really must sell GLWS great looking car.</p></blockquote><p></p>
[QUOTE="SVT_SRT8, post: 11006868, member: 104502"] Hvae you data logged and emailed to your tuner? Something could be wrong with the global spark in the #8 because of your tune. "adjustable by the tune. Also 6% doesn't seem like a big deal As a rule, most engines should have 140 to 160 lbs. of cranking compression with no more than 8-10% difference between any of the cylinders. Your plug was probably fouled because of your a/f is rich so I think a re-tune may help you. There are cheaper alternatives to test before selling your car. From Yahoo Auto's if compression is low in one or more cylinders, you can isolate the problem to the valves or rings by squirting a little 30 weight motor oil into the cylinder through the spark plug hole and repeating the compression test. The oil temporarily seals the rings. If the readings are higher the second time around, it means the rings and/or cylinder is worn. No change in the compression readings tells you the cylinder has a bad valve. Your dealer could probably do this: With electronic testing, a computer analyzer "estimates" compression in each of the engine's cylinders by measuring slight variations in engine cranking speed. The results correlate well with actual gauge readings and can be completed in a matter of minutes without having to remove any spark plugs. What's more, the analyzer prints out the results of the compression test making it easy to see and compare the actual numbers. If you really must sell GLWS great looking car. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Market
Vehicles For Sale
2011+ Mustang GT and V6 Buy/Sell
2011 Grabber blue modded 5.0, low compression #8 cyl
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