Motor not running right
Thread Starter
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Junior User
Joined: May 2011
Posts: 78
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From: San Diego, CA
Motor not running right
Okay, so here's what I've got. Had a 360/C6 setup, stock 2 bbl carb, nothing fancy, blew apart my bottom end. So I replaced it with a 390 out of a later 70's Ford. (Not sure on year) I switched everything over, Carb, distributor, etc. Now it runs horrible. I have the timing set to 12 degrees at idle, set the idle screws on the carb to about four turns out, equal for both, and have a electronic ignition.
One interesting point which I think is the problem, just not sure of the cause is, driver side exhaust blows cold air, while the passenger side blows hot air. Anyone have any ideas? Hopefully I gave enough information. Thanks in advance y'all.
One interesting point which I think is the problem, just not sure of the cause is, driver side exhaust blows cold air, while the passenger side blows hot air. Anyone have any ideas? Hopefully I gave enough information. Thanks in advance y'all.
Logistics Pro
Joined: Jan 2011
Posts: 4,762
Likes: 54
From: Antelope Valley ,CA
12 BTDC IS PROBABLY TO MUCH for a stock motor
ALSO THE 4 TURNS out is going to be running real rich
try 8btdc and start at 1 1/2 turns out , you will need a vacuum gauge to set everything correctly .
ALSO THE 4 TURNS out is going to be running real rich
try 8btdc and start at 1 1/2 turns out , you will need a vacuum gauge to set everything correctly .
Logistics Pro
Joined: Jan 2011
Posts: 4,762
Likes: 54
From: Antelope Valley ,CA
also look at drivers side , sounds like it's not firing on that bank
easy test pull one plug wire at a time
if it runs worse that cylinder was firing if no change then you found a problem
easy test pull one plug wire at a time
if it runs worse that cylinder was firing if no change then you found a problem
Thread Starter
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Junior User
Joined: May 2011
Posts: 78
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From: San Diego, CA
Okay, so I pulled all of them off one at a time, on the drivers side, it ran the same no matter what. But as soon as I pulled one off the passenger side, it ran like ****. I'm not sure what's going on.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
You need to confirm your firing order. If all the drivers side made no change, then it sounds like the plug wires are on wrong. Or maybe there is issues with valvetrain?
Cold exhaust means it's not firing in the cylinder properly. Just moving air.
Was this a good running motor when you bought it?
Cold exhaust means it's not firing in the cylinder properly. Just moving air.
Was this a good running motor when you bought it?
Thread Starter
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Junior User
Joined: May 2011
Posts: 78
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From: San Diego, CA
I bought it off a guy from Craigslist, said it was a good running motor, and I just double checked the firing order. 1 5 4 2 6 3 7 8 says it on all three of my manifolds. I have 2 390's and a 360. And that would mean it's not firing the entire driver side? Hm.
Little update, I checked, I do have spark, gonna try to get ahold of a compression tester and check that. I'm wondering if it couldn't be something with a bad carb? Or lack of fuel causing this? I'm pretty sure I have the timing set right. Worse case, burnt valve, which I hope not.
Little update, I checked, I do have spark, gonna try to get ahold of a compression tester and check that. I'm wondering if it couldn't be something with a bad carb? Or lack of fuel causing this? I'm pretty sure I have the timing set right. Worse case, burnt valve, which I hope not.
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Post Fiend
Joined: Jun 2003
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From: Black Hills of SD
Dual plane intakes don't feed side to side, it is 2 cyl from one side and 2 from the other on each plane. A compression test will tell a lot. Maybe they got the valves too tight on that side, like too long of pushrods???
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Post Fiend
Joined: Jun 2003
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From: Black Hills of SD
Yes. Single plane are pretty much high performance. All the runners suck air from the same area under the carb.
Senior User
Joined: Feb 2009
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From: Marquette, MI.
I hate to say this but just in case, are you sure you have the rotor pointing at the number one cylinder spark plug wire location on the distributer cap when the number one cyl. is at top dead center of the compression stroke? also because I don't know you ,or your mechanical knowledge,(I do not mean to offend any one that might be well aware of what I am typing already) are you counting the firing order by the passenger side front cyl. being # one, and the pass. side second cyl. being # two and so forth (1234 pass. side and 5678 drivers side). Also the rotor turns counter clockwise.
It is possible it has nothing to do with firing order or spark related, but that is what it seems like to me from the previous posts.
It is possible it has nothing to do with firing order or spark related, but that is what it seems like to me from the previous posts.
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Junior User
Joined: May 2011
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From: San Diego, CA
Actually I'm damn sure it wasn't the firing order. I checked that about ten times, lol. I had five different people ask and three of them check it too. So I had that all right. Found out what was wrong. Entire drivers band had 0 compression. All my valves were smoked. Yet my passenger side compression was running 150-160 depending upon the cylinder. So I have another head I'm gonna take down and have machined, and valve job done and all that jazz. And I think I'll be set. 
Thanks for the help y'all. I really appreciate it.
Thanks for the help y'all. I really appreciate it.
Laughing Gas
Joined: Apr 2007
Posts: 779
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From: Burton, Texas
Actually I'm damn sure it wasn't the firing order. I checked that about ten times, lol. I had five different people ask and three of them check it too. So I had that all right. Found out what was wrong. Entire drivers band had 0 compression. All my valves were smoked. Yet my passenger side compression was running 150-160 depending upon the cylinder. So I have another head I'm gonna take down and have machined, and valve job done and all that jazz. And I think I'll be set. Thanks for the help y'all. I really appreciate it.
Thanks for the help y'all. I really appreciate it.