Cylinder 7 Misfire 😎
#1
04-14-2020, 05:30 PM
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Cylinder 7 Misfire 😎
Hey guys,
So yesterday after work I started up my disco and it was idling pretty rough and it threw a check engine light. I went to advanced auto and used their OBD scanner and it said there was a misfire with cylinder 7. Any advice to what I should be looking for, or checking out? I started with testing the fuses after make sure the spark plug was tight and the connection was secure (gotta start with the basics right?) , but that's all I had time to do so far. My brothers told me to check the spark plugs to see if they're fouled (which they probably are, my disco has ~235k miles, its still solid though) and then the wires. Just wanted some more input. Thanks!
So yesterday after work I started up my disco and it was idling pretty rough and it threw a check engine light. I went to advanced auto and used their OBD scanner and it said there was a misfire with cylinder 7. Any advice to what I should be looking for, or checking out? I started with testing the fuses after make sure the spark plug was tight and the connection was secure (gotta start with the basics right?) , but that's all I had time to do so far. My brothers told me to check the spark plugs to see if they're fouled (which they probably are, my disco has ~235k miles, its still solid though) and then the wires. Just wanted some more input. Thanks!
#2
04-15-2020, 05:53 AM
Camel Trophy
Those are the same items I would check:
- HT leads... fully inserted onto spark plug and ignitor coil pack, check condition of leads for burns from laying on exhaust manifold. You can swap HT leads with cylinder 8 since they are the somewhat the same length to test out
- Spark plug... cracked ceramic, fouled/worn plug, too large of a spark gap. You can always swap out a good spark plug for the one on 7 and test out.
BTW... If cylinder #7 is giving you trouble and not cylinder #4, that tells me the coil pack is still good since 7 & 4 share the same single coil.
- HT leads... fully inserted onto spark plug and ignitor coil pack, check condition of leads for burns from laying on exhaust manifold. You can swap HT leads with cylinder 8 since they are the somewhat the same length to test out
- Spark plug... cracked ceramic, fouled/worn plug, too large of a spark gap. You can always swap out a good spark plug for the one on 7 and test out.
BTW... If cylinder #7 is giving you trouble and not cylinder #4, that tells me the coil pack is still good since 7 & 4 share the same single coil.
#3
04-15-2020, 01:10 PM
Camel Trophy
#4
04-15-2020, 01:14 PM
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@The Deputy no not because of the misfire. I had a leak in the top rad hose where I'd have to fill up alotbut I got that fixed and it's not consuming any coolant... yet 😂
#5
04-15-2020, 01:22 PM
Camel Trophy
The amount will be minimal, if leaking internally into cylinder (at first) and may go unnoticed...especially...since you had another leak previously. Top it off and keep a good eye on level after several miles of driving time. You can also buy a tester that measure exhaust gasses in the coolant...or rent one...and this will take a lot of the guess work out of this (regarding head gasket).
But, if you are certain there is no issue with internal loss of anti-freeze. Justdo your basic diagnostics, looking over wiire and plug. Maybe swap a different wire into the equation. Also, running some injector cleaner through it won't hurt. Could be fuel related.
But, if you are certain there is no issue with internal loss of anti-freeze. Justdo your basic diagnostics, looking over wiire and plug. Maybe swap a different wire into the equation. Also, running some injector cleaner through it won't hurt. Could be fuel related.
#6
04-15-2020, 02:21 PM
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