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09-12-2002, 08:38 PM
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#1 |
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Registered Member
Join Date: Dec 1998
Location: WI, U.S
Posts: 255
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Need help!...no compression in 6 and 7!!
I got on my car the other day to test out my new 30lb injectors. Took it through all the gears, got to the end of the road, turned around, and started to get on it again. Got up to second and heard a ticking/knocking that sounded like it was coming from the top of my motor. I let off immediately. Oil pressure stays fine, the car doesnt smoke..that I've noticed. It only ticks/knocks under load. The number 6 sparkplug was completely black. The rest of the plugs looked like the car may have been running rich...brown.
Did a compression test. All cylinders were between 160-170 with the exception of 6 and 7...which had no compression at all!! Now what should I do?? I havent noticed the car overheating or any signs of a blown head gasket. I may try a compression check again tomorrow to be sure. Any ideas?..please let me know!! 
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91 LX - 10.5:1 pistons, ported 289 heads, Ultradyne 588 cam, Cobra upper/lower, MSD, JBA long tube headers, Flowmaster, Richmond 4:10, roll cage, monster tach...FUN!! 95 SHO - K&N filter |
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09-12-2002, 08:45 PM
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#2 |
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Registered Member
Join Date: Jul 2002
Location: Frazeysburg,Oh
Posts: 15
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Sounds like a head gasket, blow air in #6 and see if it comes out #7
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09-12-2002, 08:49 PM
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#3 |
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Registered Member
Join Date: Dec 1998
Location: WI, U.S
Posts: 255
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How do I blow air into a cylinder??
__________________
91 LX - 10.5:1 pistons, ported 289 heads, Ultradyne 588 cam, Cobra upper/lower, MSD, JBA long tube headers, Flowmaster, Richmond 4:10, roll cage, monster tach...FUN!! 95 SHO - K&N filter |
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09-12-2002, 08:55 PM
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#4 |
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Registered Member
Join Date: Jul 2002
Location: Frazeysburg,Oh
Posts: 15
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take out the spark plug, use a blow gun with a rubber tip or the hose off of a compression tester
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09-12-2002, 09:00 PM
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#5 |
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Registered Member
Join Date: Dec 1998
Location: WI, U.S
Posts: 255
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If it was a head gasket wouldnt I have some compression?
__________________
91 LX - 10.5:1 pistons, ported 289 heads, Ultradyne 588 cam, Cobra upper/lower, MSD, JBA long tube headers, Flowmaster, Richmond 4:10, roll cage, monster tach...FUN!! 95 SHO - K&N filter |
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09-12-2002, 09:04 PM
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#6 |
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Registered Member
Join Date: Jul 2002
Location: Frazeysburg,Oh
Posts: 15
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No, the hole is big enough that the air leaks in to the next cyl. its like having a hole in the piston. but easy to check.
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09-13-2002, 03:09 PM
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#7 |
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Registered Member
Join Date: Dec 1998
Location: WI, U.S
Posts: 255
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You were right! I pulled the head today and the gasket was blown between the two cylinders. Thanks for the help!!
__________________
91 LX - 10.5:1 pistons, ported 289 heads, Ultradyne 588 cam, Cobra upper/lower, MSD, JBA long tube headers, Flowmaster, Richmond 4:10, roll cage, monster tach...FUN!! 95 SHO - K&N filter |
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