Stalls when put in drive....
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Joined: Nov 2012
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Stalls when put in drive....
77 F150 4x4 400 C6 NP203
New (points style) distr, MSD ignition, cam, intake, rebuilt 1405 edel. carb.
The problem I am having is the truck will idle great, rev pretty good just sitting still. As soon as I put it in gear it sputters and pops and just wont move more than a foot in either direction without stalling. If I rev it up and drop it into gear I get the same thing.
I have sprayed the intake area with carb cleaner.... sprayed around vacuum lines and base of carb and no indication of a leak. I've rotated the distr looking for a slightly better timing but same result. No timing light or vacuum gauge.
I'm not the greatest mechanic, so I am stumped at this point. I didn't install the cam, intake, distr..... a friend did that, but it idles great so I think the timing must be within the adjustment zone.... It would not run if he installed it wrong right?
what am I missing??? The trani functioned fine before the upgrades and this doesn't really feel like its a tran issue....
The only other clue I have is that the carb adjustment screws don't make much of a change at idle.... all the way in or out it still idles okay. I did the rebuild so I'm sure it was done correctly.
Thanks in advance
New (points style) distr, MSD ignition, cam, intake, rebuilt 1405 edel. carb.
The problem I am having is the truck will idle great, rev pretty good just sitting still. As soon as I put it in gear it sputters and pops and just wont move more than a foot in either direction without stalling. If I rev it up and drop it into gear I get the same thing.
I have sprayed the intake area with carb cleaner.... sprayed around vacuum lines and base of carb and no indication of a leak. I've rotated the distr looking for a slightly better timing but same result. No timing light or vacuum gauge.
I'm not the greatest mechanic, so I am stumped at this point. I didn't install the cam, intake, distr..... a friend did that, but it idles great so I think the timing must be within the adjustment zone.... It would not run if he installed it wrong right?
what am I missing??? The trani functioned fine before the upgrades and this doesn't really feel like its a tran issue....
The only other clue I have is that the carb adjustment screws don't make much of a change at idle.... all the way in or out it still idles okay. I did the rebuild so I'm sure it was done correctly.
Thanks in advance
Tuned
Joined: Jun 2015
Posts: 375
Likes: 3
From: Southern OR
You need use a dwell meter for adjusting your ignition points. As soon as you give it some throttle if D gear, your vac advance plate moves and is taking the points out of adjustment. I've seen this scenario before. MO
Tuned
Joined: Jun 2015
Posts: 375
Likes: 3
From: Southern OR
I just re-read your OP, You have a vacuum leak somewhere if your idle mix screws have no effect on idle. They should kill the motor when you turn them in. Does your idle increase when you cup the top of the carb with your hands?
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Idle almost dies if I put my hand on top of the carb..... it will keep running but its sucking air pretty hard around my fingers....
I checked the distr.... if I suck on the vacuum line the plate does move as it should ....
I sprayed again with carb cleaner..... cant find vacuum leak.... any chance the carb has some kind of issue I didn't find when I rebuilt it?
I checked the distr.... if I suck on the vacuum line the plate does move as it should ....
I sprayed again with carb cleaner..... cant find vacuum leak.... any chance the carb has some kind of issue I didn't find when I rebuilt it?
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Fleet Owner
Joined: Dec 2009
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From: NorCal
Check the vacuum lines going down to the AT.
Is your trans locked up?
.....MSD box but still using points? That's incongruous IMO.
.
Is your trans locked up?
.....MSD box but still using points? That's incongruous IMO.
.
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Thank you. I did check the lines to the AT. The truck wants to move..... it just doesn't have the power to go.... it will move slightly back and forth (a foot or so)...... I think I am going to take the msd out and go back to straight points.... one more thing to rule out.
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Ok... problem not solved. I have reinstalled the manifold.... double checked twice... there is no leak around the manifold or base of the carb. I have capped off all the vac lines at the carb. I still have same problem... if starts to cough and small backfires when placed into any gear... it will idle okay in park or neutral.
Where should I be looking now?? Carb problem... it was just rebuilt, but maybe there is a problem I can't see at rebuild. There is no whistling from the carb.
I put a Vac gauge on it and I am only pulling 12 inches at idle.... its a small RV cam so I'm thinking there must still be an issue somewhere. Adjusting timing does not help.
If this was a trani issue would the engine still act like this?
Where should I be looking now?? Carb problem... it was just rebuilt, but maybe there is a problem I can't see at rebuild. There is no whistling from the carb.
I put a Vac gauge on it and I am only pulling 12 inches at idle.... its a small RV cam so I'm thinking there must still be an issue somewhere. Adjusting timing does not help.
If this was a trani issue would the engine still act like this?
