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Fiesta-Si.com • View topic - no compression in cyl 1 rest normal?
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ash1987
PostPosted: Fri Jan 07, 2011 12:17 am 
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running really bad sounds like a scooby lol. its not smoking i have run engine flush thro and changed oil tonight but no change yet also put some fuel system cleaner. the sp plug has depsit on it black and smells like fuel. power in low revs is pants but 4000 + seems normal??? :sigh:
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Jam
PostPosted: Fri Jan 07, 2011 1:24 am 
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dead HT lead?

when you say no compression...is that a tested with a guage?
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ash1987
PostPosted: Fri Jan 07, 2011 7:37 pm 
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ignition is fine. compression test was done dry with a gauge m8. im thinkin pitted head on burnt out valve? but want to be sure and any other ideas? :?
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will121
PostPosted: Fri Jan 07, 2011 7:47 pm 
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have you got a zetec Si? if so and no compression on just one cylinder sounds like bent valve or simular, was it running fine then one day like it, was it associated with any other mechanical noise? if it was just down a bit on compression could also be piston ring broken, if it was could squirt a little bit of oil through plug hole and retest to see it it made any diferance

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ash1987
PostPosted: Fri Jan 07, 2011 8:03 pm 
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was totaly fine i was driving it and when i slowed down 4 a roundabout it was missfiring so pulled over exspecting 2 c a ht lead off.
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james_rs
PostPosted: Fri Jan 07, 2011 11:14 pm 
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You say it revs fine 4000+??? if so cant see it being a bent valve/dead ring.

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Jam
PostPosted: Fri Jan 07, 2011 11:57 pm 
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Air flow meter?....injector stuck open?
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Tonwah
PostPosted: Sun Jan 09, 2011 9:08 pm 
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If theres no compression on cylinder 1 its either valves not seating or cracked, piston ring or gasket, try a couple squirts on engine oil in that cylinder and do another compression test
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ash1987
PostPosted: Thu Jan 13, 2011 9:23 pm 
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dont know what it was so fit a 1.8 at weekend lol! still gona strip it down and find out what happend????
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