Engine Having a misfire issue on one cylinder

93Modfox

Member
Jun 27, 2020
6
1
13
44
Indiana
Hi guys, I seriously need some help here.
Here’s a little backstory.. bought a roller, put an engine in it and it was running decent until I realized my regulator was bad. Swapped it and now I keep running rich in 7 cylinders but number 2 looks clean. I’ve swappped injectors, plugs, wires, cap and rotor, control module and have had no change.
what would cause only number two cylinder to be clean (smells like fuel)?
Ran like this with the A9L ecu and still with the megasquirt.
 
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93Modfox

Member
Jun 27, 2020
6
1
13
44
Indiana
Hi guys, I seriously need some help here.
Here’s a little backstory.. bought a roller, put an engine in it and it was running decent until I realized my regulator was bad. Swapped it and now I keep running rich in 7 cylinders but number 2 looks clean. I’ve swappped injectors, plugs, wires, cap and rotor, control module and have had no change.
what would cause only number two cylinder to be clean (smells like fuel)?
Ran like this with the A9L ecu and still with the megasquirt.
 

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93Modfox

Member
Jun 27, 2020
6
1
13
44
Indiana
Well, I’ve been through everything. Ignition and fuel, everything checked out fine. I decided to do a compression test and found #2 cylinder was a big goose egg, 0 compression. Now I need to figure out if it’s in the head or at the piston.
 

rockyracoon

10 Year Member
Nov 23, 2005
790
17
29
margate NJ
Consider running a leakdown test if you have a tester. Or even just take the check valve out of your compression tester hose and listen for where air is escaping.
 

93Modfox

Member
Jun 27, 2020
6
1
13
44
Indiana
I backed the rocker off and the valve closed. Put air to it again and determined that the valve was completely shut and the rings were fine (leak down). I must have a lifter issue of some kind. This happened out of nowhere.. anyone ever had an issue like this?
 
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