Looking for some help
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Junior User
Joined: Mar 2012
Posts: 55
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From: costa mesa CA
Looking for some help
So i recently swap out a c4 with a c6 in my 63 with a 1978 302 from a f100. Every thing seems to be ok but when i press on the gas it bowgs out and jumps forward and stops jumps forward stops ect. Do i need to turn the mod valve and calibrate it to the 302 some how since the c6 used to be on a 351, or did i miss something simple.
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
TJ, Do you know if it was operating smoothly in it's donor? Has it setup for a while? How does it shift from a normal start from a stop to 40+ mph?
I did some adjusting on mine when I first got it. My experience with the adjusting it moved shift points up or down.
Was your engine running/working like it should with the C4? Did you pull it and run the C6 in like a few days time?
I'm thinking engine vacuum but hopefully better help will be along shortly.
John
I did some adjusting on mine when I first got it. My experience with the adjusting it moved shift points up or down.
Was your engine running/working like it should with the C4? Did you pull it and run the C6 in like a few days time?
I'm thinking engine vacuum but hopefully better help will be along shortly.
John
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From: Sedro-Woolley, WA
I'm assuming "bowgs" is a typo for bogs. If so, is it the engine that is bogging down? Is the engine rpm being dragged down as if your truck were tied to a tree?
From what I gather from your post I'm leaning towards a vacuum issue also. Check all the lines from the carb to the modulator. Put a separate line on the modulator and suck into it to see if the diaphragm leaks, if so then you need to replace the modulator.
How big of a carb are you running?
From what I gather from your post I'm leaning towards a vacuum issue also. Check all the lines from the carb to the modulator. Put a separate line on the modulator and suck into it to see if the diaphragm leaks, if so then you need to replace the modulator.
How big of a carb are you running?
Thread Starter
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Junior User
Joined: Mar 2012
Posts: 55
Likes: 0
From: costa mesa CA
I'm assuming "bowgs" is a typo for bogs. If so, is it the engine that is bogging down? Is the engine rpm being dragged down as if your truck were tied to a tree?
From what I gather from your post I'm leaning towards a vacuum issue also. Check all the lines from the carb to the modulator. Put a separate line on the modulator and suck into it to see if the diaphragm leaks, if so then you need to replace the modulator.
How big of a carb are you running?
From what I gather from your post I'm leaning towards a vacuum issue also. Check all the lines from the carb to the modulator. Put a separate line on the modulator and suck into it to see if the diaphragm leaks, if so then you need to replace the modulator.
How big of a carb are you running?
Yes the engine boggs down like there are no rpms and then jumps forward, no leaks on the modulator. the carb is a stock two barrel from the 1978 302
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
TJ, Where did you connect the mod valve vacuum hose to on the engine?
Try disconnecting it and see what happens.
That tranny setting up for a long period could be an issue but shouldn't affect the running of the engine.
John
Try disconnecting it and see what happens.
That tranny setting up for a long period could be an issue but shouldn't affect the running of the engine.
John
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Junior User
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From: costa mesa CA
Did that and the same thing happens nothing really changed except it dies alittle quicker when i put it in to drive
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Thread Starter
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Junior User
Joined: Mar 2012
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From: costa mesa CA
The intake where it was before never touched it, well on that end. I will take a pic.
Elder User
Joined: Jun 2012
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Tattyjoe,
I am thinking distributor advance problem.
If you have eletronic ignition it will do this. As the advance moves, it pulls on the wiring, if there is a break in the wiring, it will bog the engine. When the advance returns to original position, the wire reconncts and lets the engine run. I have never see this happen with standard points but it could, more likel by grounding as it advances
If not that distributor advance, I would check for vacume leaks by spraying starting fluid at all connections. It will rev higher when you spray the leak.
Good luck
Dennis
I am thinking distributor advance problem.
If you have eletronic ignition it will do this. As the advance moves, it pulls on the wiring, if there is a break in the wiring, it will bog the engine. When the advance returns to original position, the wire reconncts and lets the engine run. I have never see this happen with standard points but it could, more likel by grounding as it advances
If not that distributor advance, I would check for vacume leaks by spraying starting fluid at all connections. It will rev higher when you spray the leak.
Good luck
Dennis
Thread Starter
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Junior User
Joined: Mar 2012
Posts: 55
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From: costa mesa CA
Tattyjoe,
I am thinking distributor advance problem.
If you have eletronic ignition it will do this. As the advance moves, it pulls on the wiring, if there is a break in the wiring, it will bog the engine. When the advance returns to original position, the wire reconncts and lets the engine run. I have never see this happen with standard points but it could, more likel by grounding as it advances
If not that distributor advance, I would check for vacume leaks by spraying starting fluid at all connections. It will rev higher when you spray the leak.
Good luck
Dennis
I am thinking distributor advance problem.
If you have eletronic ignition it will do this. As the advance moves, it pulls on the wiring, if there is a break in the wiring, it will bog the engine. When the advance returns to original position, the wire reconncts and lets the engine run. I have never see this happen with standard points but it could, more likel by grounding as it advances
If not that distributor advance, I would check for vacume leaks by spraying starting fluid at all connections. It will rev higher when you spray the leak.
Good luck
Dennis
Thread Starter
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Junior User
Joined: Mar 2012
Posts: 55
Likes: 0
From: costa mesa CA
Ok so i put new lines on it and now it goes forward back all good untill I get the rpms up and then it dies it makes like crackling noise and then it just dies, anybody got a clue or if not anybody want to buy a 63 f100 arrg!!