Cylinder 7 misfire - Defender Source
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  #1  
Old July 24th, 2010, 04:20 PM
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Alexandra
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Cylinder 7 misfire

Finally got a code reader. This is for a 2003 Discoe, Dweb is down so I can't search over there.

Error code was for cylinder 7 misfire. I've had the service engine soon light on for a while, talked to LR and they said as long as it wasn't flashing I was fine. Got in the truck today and it started flashing and it was misfiring. Turned if off, let it sit, read the code, running fine now. Cleared it to see if it will re-set and come back.

Anything I need to do to address this or is this just a cranky truck.
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  #2  
Old July 24th, 2010, 04:37 PM
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Good chance you have a dropped liner.
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Old July 24th, 2010, 05:04 PM
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Alexandra
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Actual code was P0307 Generic Cylinder 7 misfire detected

LR recently (as in last 3-4 months) pull the heads to inspect them after the coolant leak repair. Would dropped liner be related to that? Truck has 65k miles on it.

How do I check the liner?
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  #4  
Old July 24th, 2010, 08:14 PM
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Pull the #7 plug and another plug and compare.

robinson service has lots about the various issues on the website.
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  #5  
Old July 25th, 2010, 10:40 AM
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Could be;

a) bad spark plug
b) bad wire
c) bad coil

If its none of those, then you may have coolant in the cylinder, there are a few ways coolant may get into the cylinder;

1) bad head gasket -- luckily for you, its #7, so that gives you the possibility of it being a head gasket related issue since there is a coolant channel on the back of the engine, so a torn gasket could put coolant in the cylinder
2) slipped liner
3) cracked block
4) cracked head

So you'll want to find out if there is coolant in the cylinder.. first pull the spark plug and take a look at it... if it looks like it was steam cleaned compared to the other ones, that's a sign of coolant in the cylinder... you could also get a little piece of paper and roll it up and 'dip' it into the spark plug hole and see if it has any coolant on it when you pull it out. You could also drain the oil and see if there is coolant in it... and you could also do a block gas test to see if there is exhaust gas in the coolant. The best thing to do is just to tear it down and see what's going on... if LR has had it open in the last 3-4 months, it should still be under warranty from that repair, so they should take some responsibility.
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  #6  
Old July 25th, 2010, 11:30 AM
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Don't overlook a bad speed sensor, common with odd cylinder misfire codes or a sticking exhaust valve from carbon buildup.
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