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2150 Carb Adjustment


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#1 thesprocket

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Posted 31 January 2011 - 04:28 PM

I just recently bought a 78 Bronco 351M. After it warms up and I can take my foot off the gas pedal due to the choke cable either broke or was cut by the p.o. Leaving me with no idea where it even attaches. The idle is very very high while in park. It is around 650 to 700 rpms in drive. As soon as it is shifted back into Neutral or Park it goes back up to very high.

#2 Seabronc

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Posted 31 January 2011 - 06:17 PM

What do you mean by very high 11 to 13 hundred? The in gear idle could probably be brought down to 550 - 600 as long as there is nothing heavy duty that will cut in while there. If you bring your hot idle down in gear, that will also bring the neutral idle down. If you have a manual choke kit on it, it is attached to the left side as looking from the front of the truck. It originally would probably have had an electric choke. The Hot idle adjustment is at the bottom of the carb behind the throttle lever.

If you need it, I'll put the entire 2150 section of my service manual up tomorrow.

Good luck,
Fred

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#3 thesprocket

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Posted 01 February 2011 - 06:37 AM

What do you mean by very high 11 to 13 hundred? The in gear idle could probably be brought down to 550 - 600 as long as there is nothing heavy duty that will cut in while there. If you bring your hot idle down in gear, that will also bring the neutral idle down. If you have a manual choke kit on it, it is attached to the left side as looking from the front of the truck. It originally would probably have had an electric choke. The Hot idle adjustment is at the bottom of the carb behind the throttle lever.

If you need it, I'll put the entire 2150 section of my service manual up tomorrow.

Good luck,

Yes it runs about 1100 to 1300 rpms when she warms up and in park. I adjusted the idle down in park but shift into gear and it dies. I tried to find a medium between the two but it feels like it is going to die at stop lights. Is it normal for it to run like this. I have no electrical wiring going to the carb. So I don't think it is an electric choke. This doesn't mean it's not. Half the wires on it have been cut for some reason. Even oil pressure and temp.
The 2150 Manual might would help.
Thanks

#4 Seabronc

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Posted 01 February 2011 - 11:49 AM

Yes it runs about 1100 to 1300 rpms when she warms up and in park. I adjusted the idle down in park but shift into gear and it dies. I tried to find a medium between the two but it feels like it is going to die at stop lights. Is it normal for it to run like this. I have no electrical wiring going to the carb. So I don't think it is an electric choke. This doesn't mean it's not. Half the wires on it have been cut for some reason. Even oil pressure and temp.
The 2150 Manual might would help.
Thanks


You have to adjust the idle in DRIVE, Need someone in the truck with the parking brake on and foot on the brake peddle. 11 to 13 hundred is not extreme for an automatic in NEUTRAL. You will have to play with it a little, but adjust it till it runs but doesn't stall. If it feels like it is going to stall at lights bump it up just a tiny bit.

Good luck,
:)>-
Fred

Parts replacement is not trouble shooting, replacement follows trouble shooting

Broncos are MPVs not SUVs

Engines run on fuel, or steam

Motors run on electricity, hydraulic fluid, vacuum, or air


Communication: I know you think you know what I said, but what you need to know is, I didn't say what I meant.

Some of my pictures at Supermotors http://www.supermotors.net/212

#5 thesprocket

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Posted 02 February 2011 - 06:53 AM

You have to adjust the idle in DRIVE, Need someone in the truck with the parking brake on and foot on the brake peddle. 11 to 13 hundred is not extreme for an automatic in NEUTRAL. You will have to play with it a little, but adjust it till it runs but doesn't stall. If it feels like it is going to stall at lights bump it up just a tiny bit.

Good luck,
:)>-

I'll try that. Now I have to figure out what is wrong with the Choke. Looks like part of it may be missing.
Thanks

#6 thesprocket

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Posted 07 February 2011 - 10:14 AM

I'll try that. Now I have to figure out what is wrong with the Choke. Looks like part of it may be missing.
Thanks

Update, It was a vacuum leak causing the idle problem. It was the line to the transmission.

#7 Seabronc

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Posted 07 February 2011 - 01:01 PM

Thanks for the feed back. Glad you got it taken care of. Bet your tranny shifts better now too.

Good luck,

:)>-
Fred

Parts replacement is not trouble shooting, replacement follows trouble shooting

Broncos are MPVs not SUVs

Engines run on fuel, or steam

Motors run on electricity, hydraulic fluid, vacuum, or air


Communication: I know you think you know what I said, but what you need to know is, I didn't say what I meant.

Some of my pictures at Supermotors http://www.supermotors.net/212

#8 thesprocket

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Posted 09 February 2011 - 08:50 AM

Thanks for the feed back. Glad you got it taken care of. Bet your tranny shifts better now too.

Good luck,

:)>-


Oh ya much better.
Thanks for the help,



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