Dead Cylinder Questions
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Far-fetched? Yes. The man has an unusual problem. Folks are trying to offer possible causes so he can check them out. It was a "left field" suggestion from the beginning.
Merry Christmas...
Merry Christmas...
Safety Car
Joined: Sep 2007
Posts: 4,458
Likes: 331
From: Indy Indiana
Get you one of these:
http://www.autozone.com/autozone/acc...entifier=10257
cheap, and you can dial up or down your gap to eyeball whether or not you have a good strong spark. If you can eyeball your spark across the gap.. (all at rpms) then you can conclude if you can rule out spark issues.
http://www.autozone.com/autozone/acc...entifier=10257
cheap, and you can dial up or down your gap to eyeball whether or not you have a good strong spark. If you can eyeball your spark across the gap.. (all at rpms) then you can conclude if you can rule out spark issues.
Last edited by joewill; Dec 20, 2013 at 11:43 AM.
Pro
Joined: Jul 2004
Posts: 605
Likes: 0
From: Alta Loma CA
Had a similar situation. Despite doing all the checks everyone suggested above I could not get it working correctly. One night I opened the hood with the car running before I turned the garage lights on. The plug wires looked like a light show. They were arcing all over the place. The wires had less than a 1000 miles on them. The cylinder that did not fire was shorting out. Never would have guessed until I saw that light show in a dark garage. Sometimes plug wires seem good when they are not.
Safety Car
Joined: Sep 2007
Posts: 4,458
Likes: 331
From: Indy Indiana
also, it is possible you have a blowout/crack/burnout under that cylinder runner in your intake manifold and you are sucking in crankcase gasses.. totally screwing up your mixture at lower rpms for that port.. But that is another left field analysis... you would have to yank your manifold to see.. or as you said, send a scope down that runner.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Folks, this is just basic troubleshooting - we don't need to be looking at space aliens quite yet.
Two suggestions here to put a timing light on the affected cylinder, but the OP doesn't appear to have done that basic, simple check yet.
Two suggestions here to put a timing light on the affected cylinder, but the OP doesn't appear to have done that basic, simple check yet.
Safety Car
Joined: Sep 2007
Posts: 4,458
Likes: 331
From: Indy Indiana
depends on the spec and quality of the timing light.. the light might fire off but still not enough voltage to cause spark to jump the gap.. what triggers the light to fire? 50 volts? 20,000 volts? depends on the electronic internals of that tool. The point is, just because the timing light fires, does not guarantee the spark is jumping the gap, or that there is enough voltage to do so.
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Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
This motor he is driving on it ... It drives fine .. rockers move equal to the others , compression is 150lbs ( a sign of no blockage imop ) and the issue is low header temp on cyl 2 at idle ....
Currently He is checking for a intake runner blockage .. Not sure how that leap was made .. It is far fetched for sure .. But he has a borescope on the way , as bad as that idea is he had the carb off , I would have slid a coat hanger into the intake but borescope it is ..
I say head gasket ... He is sucking water into the cyl at idle and it is cooling the cylinder down imop. If it is a intake runner blockage I look good with egg on my face LMAO
Currently He is checking for a intake runner blockage .. Not sure how that leap was made .. It is far fetched for sure .. But he has a borescope on the way , as bad as that idea is he had the carb off , I would have slid a coat hanger into the intake but borescope it is ..
I say head gasket ... He is sucking water into the cyl at idle and it is cooling the cylinder down imop. If it is a intake runner blockage I look good with egg on my face LMAO
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
This motor he is driving on it ... It drives fine .. rockers move equal to the others , compression is 150lbs ( a sign of no blockage imop ) and the issue is low header temp on cyl 2 at idle ....
Currently He is checking for a intake runner blockage .. Not sure how that leap was made .. It is far fetched for sure .. But he has a borescope on the way , as bad as that idea is he had the carb off , I would have slid a coat hanger into the intake but borescope it is ..
I say head gasket ... He is sucking water into the cyl at idle and it is cooling the cylinder down imop. If it is a intake runner blockage I look good with egg on my face LMAO
Currently He is checking for a intake runner blockage .. Not sure how that leap was made .. It is far fetched for sure .. But he has a borescope on the way , as bad as that idea is he had the carb off , I would have slid a coat hanger into the intake but borescope it is ..
I say head gasket ... He is sucking water into the cyl at idle and it is cooling the cylinder down imop. If it is a intake runner blockage I look good with egg on my face LMAO
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Thread Starter
Racer
Joined: Jul 2007
Posts: 348
Likes: 12
From: Ocala, Florida
Problem SOLVED a passage in the carb was blocked. The motor now has the same heat on each cylinder at the header. The motor now pulls like crazy, maybe 8 cyl is better than 7, thanks for everyones help. by the way the boroscope was neat could examine each intake passage. Thanks again JAY
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
And how is it only 1 cyl was affected ,,, Can you elaborate ... Cause that makes no sense at all .. If it was fuel injection ya but a blocked carb passage ? What passage ? that is off the wall for sure
Last edited by diehrd; Dec 22, 2013 at 08:20 PM.
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
I cant wait to here the physics behind this solution .... I am on the edge of my seat craving a sense of understanding ... Personally right from go that 1 cyl header is so much cooler begs of spark issues .. It jumped to a blocked intake runner ,, how it went their is amazing and now the impossible ,, it was a carb passage that affected only cyl # 2 .
I sure wish he would reply I want a good laugh I can start my day with or some new knowledge to add to my book of the unknown ..
I sure wish he would reply I want a good laugh I can start my day with or some new knowledge to add to my book of the unknown ..
Thread Starter
Racer
Joined: Jul 2007
Posts: 348
Likes: 12
From: Ocala, Florida
This is my reply! Maybe the carb might not have been the problem but after exhausting every other test and blowing out the passages of the carb, and then having cylinder 2 heat up to equal the other cylinders the carb may have been the problem. I checked the following in this order changed spark plug, changed plug wire, removed valve cover rockers all moved the same for all cylinders on that side of motor, used a boroscope in each intake no blockage, took carb apart and blew out all passages and something came out one passage, after each test started motor and no change until blowing out carb, so what else might have been the problem?????? Just asking the EXPERTS. JAY
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
This is my reply! Maybe the carb might not have been the problem but after exhausting every other test and blowing out the passages of the carb, and then having cylinder 2 heat up to equal the other cylinders the carb may have been the problem. I checked the following in this order changed spark plug, changed plug wire, removed valve cover rockers all moved the same for all cylinders on that side of motor, used a boroscope in each intake no blockage, took carb apart and blew out all passages and something came out one passage, after each test started motor and no change until blowing out carb, so what else might have been the problem?????? Just asking the EXPERTS. JAY
My best guess is the spark plug wire or other ignition item. And with all the part moving you did to troubleshoot it if I had to guess I would go with spark plug wire because if it is bent and moved to diff cylinder a potential break in the wire might close with a different twist or turn on it ..
Or a gremlin , ya know those darn AMC gremlins are worth a ton now a day's LMAO ...