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Alex Forman

Rough and low idle

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Hi,

My 73 2002 has been sitting for a few years now but I have done the normal things you do when you first start up a car that has been sitting (oil and filter change, siphoned out old gas and put in new gas, and put in a new battery). When I first started it up it had a very low idle(a zero on the rpm gauge) and it would constantly stall out. I thought that taking off the carb lid would help, which it did. It still had a low idle and stalled out ocasionally. I then replaced the fuel filter which helped a lot but it still has a very rough and low idle. If I give it some gas and take it above 1500 rpm it sounds amazing but if I let it idle it is super rough. It doesn't stall out that much any more and it can idle without stalling out but I still want to fix the idle. Any ideas on what could be the problem?

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Idle jet should be pulled cleaned especially after sitting for any length of time. spin it out and shoot in an aerosol carb cleaner, and that should solve the problem (or at least eliminate one potential cause)

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1 minute ago, Guy Cocquyt said:

Idle jet should be pulled cleaned especially after sitting for any length of time. spin it out and shoot in an aerosol carb cleaner, and that should solve the problem (or at least eliminate one potential cause)

Where is the idle jet? 

I am not too familiar with all the parts in the engine.

 

Thanks

Alex

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1 minute ago, Guy Cocquyt said:

Alex, do you have a solex single or double barrel or a weber carb?

I am not sure but I believe a double barrel. The carb is the original bmw and it has 2 inlet flaps when the carb top is taken off. 

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Actually, I think I do think I have a weber carb. Here is a photo of my carb. 

 

Where would the idle jet be on this?

IMG_5322.HEIC

Thanks for all the help. 

 

 

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1 minute ago, Guy Cocquyt said:

Not sure of the file type, that won't open for me. Can you re-post as a Jpeg.

Sure. 

Here you go:

 

IMG_5322.thumb.jpg.893e8deb499f5de2ef193710543b38fe.jpg

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11 minutes ago, Guy Cocquyt said:

Can you shoot a picture of the other side?

Sent from my STH100-1 using Tapatalk
 

Here you go:

 

Thanks for all the help so far. I really appreciate it. 

All of the fluid is from cleaner since the whole carb was covered in grease. 

 

IMG_8602.thumb.jpg.048aeb39e7d1260ee7afa57300d664fe.jpg

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Here is a photo of another weber, you are looking for a brass screw head (slotted) like this near the base of the carb. I am not really familiar with webers, so if anyone else out their want to chime in please do so.

image.thumb.png.b5148dc3ceb908c2cd9ddb21f589f2f2.png

 

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(edited)

You need to give 12V positive power to this spade connector on the idle cut off solenoid, so it will pull the pin out of the idle jet and allow fuel to flow.  (switched power -- on with the ignition)

792382091_gooeyweber32-36.thumb.jpg.2fc2ddc151e61f0123e6bb3a14e00f4d.jpg

Here is one on the bench with power off 

053.thumb.JPG.d5f8f3c213614a1cc44834afc71fad49.JPG

and power on. 

052.thumb.JPG.a09fc1e2da7d8253eaa42af1cee88a91.JPG

see how that little pin retracts? 

 

the idle jet is pressed into the end of this solenoid (removed for these photos).

Edited by '76mintgrün'02
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I took off the wire to take the photo, but after checking the solenoid, it does not retract so I will replace it. 

 

 

Thanks!

 

 

2 hours ago, '76mintgrün'02 said:

You need to give 12V positive power to this spade connector on the idle cut off solenoid, so it will pull the pin out of the idle jet and allow fuel to flow.  (switched power -- on with the ignition)

792382091_gooeyweber32-36.thumb.jpg.2fc2ddc151e61f0123e6bb3a14e00f4d.jpg

Here is one on the bench with power off 

053.thumb.JPG.d5f8f3c213614a1cc44834afc71fad49.JPG

and power on. 

052.thumb.JPG.a09fc1e2da7d8253eaa42af1cee88a91.JPG

see how that little pin retracts? 

 

the idle jet is pressed into the end of this solenoid (removed for these photos).

 

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If you are sure it is not working, you could snip off the pin and put it back in.  That should get you up and idling again.

 

 

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