Head gasket?
#1
Head gasket?
Hello everybody,
I recently picked up an 03 R53 with 120k miles but it has some problems. If the car sits for about 1-2 weeks the next time I start it throws a code "misfire in cylinder 3". I put new plugs in when I got it and today when I pulled them plug 3 was all coated in black soot, the others still look great. Looking down into the cylinders 1,2 & 4 look the same; black (carbon) but cylinder 3 was "cleaner" and looked wet. Today I did a compression test and got:
1 = 150
2 = 150
3 = 160
4 = 120,130
So I was figuring it must be the head gasket but these results kind of threw me. If it is leaking into cylinder 3 I was expecting it to be the low one. I never had a bad head gasket so I am wondering if this type of thing is common when it goes bad. I thought I would see if anybody had any input before start tearing things apart. Thanks in advance!
I recently picked up an 03 R53 with 120k miles but it has some problems. If the car sits for about 1-2 weeks the next time I start it throws a code "misfire in cylinder 3". I put new plugs in when I got it and today when I pulled them plug 3 was all coated in black soot, the others still look great. Looking down into the cylinders 1,2 & 4 look the same; black (carbon) but cylinder 3 was "cleaner" and looked wet. Today I did a compression test and got:
1 = 150
2 = 150
3 = 160
4 = 120,130
So I was figuring it must be the head gasket but these results kind of threw me. If it is leaking into cylinder 3 I was expecting it to be the low one. I never had a bad head gasket so I am wondering if this type of thing is common when it goes bad. I thought I would see if anybody had any input before start tearing things apart. Thanks in advance!
#3
Yep back of the coil pack, I add a little electrical grease to help.
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#4
All new plugs and wires. Cleaned all connections on coil and used dielectric grease. Again, it only has a misfire when first starting after sitting for a week or more. If i let it run for a bit and restart it runs OK. If i drive it every day it runs OK. Im more concerned and confused about the loss of compression in cyl4. What is the best way to determine the source of the loss? I guess it looks like a big job any way I slice it...
#5
All i can think is a leaking valve stem or a slow leak. Sticky valve? I would d a leak down test.
__________________
MINI Guru/ MINI Owner Since 2004 | NEW Lifetime Part Replacement | Local Pickup
Milltek | Genuine MINI | Forge Motorsport | NM Engineering | ECS Performance | M7 Speed
Customer Service Hours: 8am-8pm EST|Sales Team Hours: 8am-11pm | SAT 10am-7pm 800.924.5172
MINI Guru/ MINI Owner Since 2004 | NEW Lifetime Part Replacement | Local Pickup
Milltek | Genuine MINI | Forge Motorsport | NM Engineering | ECS Performance | M7 Speed
Customer Service Hours: 8am-8pm EST|Sales Team Hours: 8am-11pm | SAT 10am-7pm 800.924.5172
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