Slight timing issue
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Safety Car
Joined: Nov 2006
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Slight timing issue
Ive got a small timing problem, not a big enough one to where it runds like crap, the car runs strong, but its enough of a problem to make it hesitate on acceleration and a a solid crusing RPM its not a steady "rrrrrrrrrrrrrr" its more of a "rrr-rrrrRrrrR-rrrrrr-rrrr" ect ect
a friend of mine told me that its small enough that it might be able to be fixed just by rotating the dist cap slightly, Im away from my home due to college and have only basic hand tools, and the lack of a timing light in both townd will make it tricky
Im by no means a timing wizard (as you can CLEARLY see) but Ive read the timing sticky thread and know my way through it in theory
the car is a 1974 L48 by the way
Thanks guys!
Miles
a friend of mine told me that its small enough that it might be able to be fixed just by rotating the dist cap slightly, Im away from my home due to college and have only basic hand tools, and the lack of a timing light in both townd will make it tricky
Im by no means a timing wizard (as you can CLEARLY see) but Ive read the timing sticky thread and know my way through it in theory
the car is a 1974 L48 by the way
Thanks guys!
Miles
Drifting
Joined: Aug 2007
Posts: 1,838
Likes: 13
From: Kingman AZ
Doesn't sound like timing although timing may become an issue later. First off I am making comments based on the explanation you give. Hopefully I can interpret correctly. I hope I can be helpful as I am going thru similar issues and have learned a bit. Whew...
When a motor goes rrr-rrrrRrrrR-rrrrrr-rrrr. It means all rrr's (small r's) are when the motor is firing correctly The big R is called a miss-fire. The firing order is 18436572
Theoretically 18436572= rrrrRrrr
It would be impossible to hear with your ears is as it occurs so quickly but this would suggest a problem with the 6 cylinder in the firing order.
Therefore I suggest. Replace spark plugs. Replace wires. Check timing.
Let us know what happens. Don't advance the timing before fixing these items.
A few other things come to mind but one step at a time.
One other concern. DO you have HEI? If not you may have other issues with ignition along with the wires and plugs.
When a motor goes rrr-rrrrRrrrR-rrrrrr-rrrr. It means all rrr's (small r's) are when the motor is firing correctly The big R is called a miss-fire. The firing order is 18436572
Theoretically 18436572= rrrrRrrr
It would be impossible to hear with your ears is as it occurs so quickly but this would suggest a problem with the 6 cylinder in the firing order.
Therefore I suggest. Replace spark plugs. Replace wires. Check timing.
Let us know what happens. Don't advance the timing before fixing these items.
A few other things come to mind but one step at a time.
One other concern. DO you have HEI? If not you may have other issues with ignition along with the wires and plugs.
Last edited by rayluka; Oct 11, 2008 at 12:42 AM.
Thread Starter
Safety Car
Joined: Nov 2006
Posts: 4,449
Likes: 0
Doesn't sound like timing although timing may become an issue later. First off I am making comments based on the explanation you give. Hopefully I can interpret correctly. I hope I can be helpful as I am going thru similar issues and have learned a bit. Whew...
When a motor goes rrr-rrrrRrrrR-rrrrrr-rrrr. It means all rrr's (small r's) are when the motor is firing correctly The big R is called a miss-fire. The firing order is 18436572
Theoretically 18436572= rrrrRrrr
It would be impossible to hear with your ears is as it occurs so quickly but this would suggest a problem with the 6 cylinder in the firing order.
Therefore I suggest. Replace spark plugs. Replace wires. Check timing.
Let us know what happens. Don't advance the timing before fixing these items.
A few other things come to mind but one step at a time.
One other concern. DO you have HEI? If not you may have other issues with ignition along with the wires and plugs.
When a motor goes rrr-rrrrRrrrR-rrrrrr-rrrr. It means all rrr's (small r's) are when the motor is firing correctly The big R is called a miss-fire. The firing order is 18436572
Theoretically 18436572= rrrrRrrr
It would be impossible to hear with your ears is as it occurs so quickly but this would suggest a problem with the 6 cylinder in the firing order.
Therefore I suggest. Replace spark plugs. Replace wires. Check timing.
Let us know what happens. Don't advance the timing before fixing these items.
A few other things come to mind but one step at a time.
One other concern. DO you have HEI? If not you may have other issues with ignition along with the wires and plugs.
I replaced the plugs and wires about a year and a half ago, along with tuning the carb over the summer, this is the only reason I think its timing
I think your right with them being mis-fires
running at a steady RPM its just a really unsteady growl, to TRY to explain more clearly the "R"'s are the normal sound it should give out, just like the rest, but louder than the rest
sometime running at about 1500-1700 when one of the louder "R"'s hit, i can almost feel a small surge of acceleration, maby this is my imagination (and it could be), Ill be driving to nixa tomorrow and Ill try to get a sound clip/video of it (the audio on my camera blows so we'll see how it goes)
Thread Starter
Safety Car
Joined: Nov 2006
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Le Mans Master
Joined: May 2003
Posts: 8,875
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From: Fernandina Beach FL
2023 Restomod of the Year finalist
2020 C3 of the Year Winner - Modified
Why don't you read through BarryK's "sticky' on Timing at the top of this section. Follow through w/ his great post...Tough for me ( and probably others) to diagnose the which "r" it might be....
Good luck
Good luck
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