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Old July 20th, 2009, 09:15 PM   #1
PHATS79
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Default cylinder not firing

have a 454 with hei in a 79 pickup. new plugs wires cap rotor. my header tube on the number 1 cylinder is staying about 300 degreese cooler than all the rest. i took the plug out and turned the motor over and it is sparking like it should. wondering if anyone has any suggestions as to what my problem is. thanks
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Old July 20th, 2009, 09:16 PM   #2
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did you do a compression test? sounds like you may have a weak cylinder.
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Old July 20th, 2009, 09:18 PM   #3
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no i havent. i havent had the truck long, and supposedly when i bought it it had a "fresh" motor in it, so i didnt really think of that.
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Old July 20th, 2009, 11:55 PM   #4
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did you do a compression test? sounds like you may have a weak cylinder.

x2. check your valve lashing too. It may be to tight and keeping the valve open just a bit.
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Old July 21st, 2009, 02:20 PM   #5
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well i just got done checking my pressure in each cylinder and i think im f'ed.

8- 145 psi
6- 145 psi
4- 145 psi
2- 130 psi
7- 135 psi
5- 130 psi
3- 135 psi
1- didnt move the f'ing gauge

i dont really know much about heads. never had one apart. only ever messed with bottom ends.
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Old July 21st, 2009, 08:52 PM   #6
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Try loosening the lifters on that cylinder up a bit. Until you can move the rockers with your finger. Then recheck your compression on that cylinder. I hope that fixes it. If not, you may be able to talk to the previous owner and get the info on the engine builder. Contact him and see if he will do anything about it. All this depends on how many miles and how long it's been ofcourse.
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Old July 21st, 2009, 09:19 PM   #7
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ok i will try that. i also got a little trick to help figure out if its the valves or rings. another thing is when i changed the oil right after i bought it it still had that metallic colored engine break in oil so that makes me think that its more than likely a valve adjustment or seat. plus it never smoked at all.
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Old July 21st, 2009, 10:10 PM   #8
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take your valve covers off and check the keepers in the middle of the spring , mine broke loose and read 0 on compresson gage as well. easy and cheep fix.
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Old July 25th, 2009, 11:38 AM   #9
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take your valve covers off and check the keepers in the middle of the spring , mine broke loose and read 0 on compresson gage as well. easy and cheep fix.
only a cheep fix if it didn't drop the valve and damage the head or piston
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Old July 27th, 2009, 11:24 PM   #10
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didnt have time to work on it over the weekend but i will take the cover off this week and check the keepers
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Old July 27th, 2009, 11:29 PM   #11
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You can also loosen the rocker arms and put air in the cylinder with an air hold adapter and listen to see where the air is going (intake, exhaust, cooling system or crankcase)
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Old July 30th, 2009, 07:38 AM   #12
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I'd check the rocker arms first to see if they are indead to tight on the valve!
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