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 Old 10-10-2018, 10:52 PM   #1
 
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Default Question will leaking injector seals cause low comp

Mazda speed 6
150 k miles
p0301 pending code
cylinder contribution test (unplug coil #1 ) and idles the same
Low compression from leaking injector seals? Like 120 psi on #1 while others at 160

Car runs great for the most part but will get a DTC for p0301 come back consistently.

plug gap is set at 25 on denso plugs

have swapped coils and misfire is always p0301
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 Old 10-11-2018, 06:08 AM   #2
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Yes its possible.
But if they are leaking that much that you have a 40 psi drop on that cylinder you should be able to see marks around the bore for that injector on the head indicating the leakage.
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 Old 10-11-2018, 12:31 PM   #3
 
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leak is 1 thing but 120 psi isn't enough to feel no difference when disconnecting a coil...i would check further as the sound of this engine on 3 cylinder is very different from running correctly with 4.
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 Old 10-11-2018, 07:16 PM   #4
 
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Do a leak test and pressurize the cylinder and listen to the injector area for air from the cylinder...
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 Old 10-11-2018, 08:27 PM   #5
 
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 Old 10-12-2018, 10:55 AM   #6
 
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Originally Posted by Jeff23spl View Post
leak is 1 thing but 120 psi isn't enough to feel no difference when disconnecting a coil...i would check further as the sound of this engine on 3 cylinder is very different from running correctly with 4.
the coil disconnect was at idle .

I have not done leak down test yet, sounds like a combo of leaking injector seals and gummed up valves...
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 Old 10-12-2018, 11:09 AM   #7
 
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Originally Posted by stariondriver View Post
the coil disconnect was at idle .

I have not done leak down test yet, sounds like a combo of leaking injector seals and gummed up valves...
Our valves don't get gummed up but rather accumulate a hard carbon build up. Any misfire codes?
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 Old 10-12-2018, 01:39 PM   #8
 
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Originally Posted by Thor Hammer View Post
Our valves don't get gummed up but rather accumulate a hard carbon build up. Any misfire codes?
yup p0301 as stated
Coked on oil=gummed we are talking about the same thing
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