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1977 MGB Stalls when braking - PLEASE HELP

Hi, I have had this 1977 MGB since it was new. Recently I started to develop a stall when I brake (light - moderate - or hard). I can pop the clutch and restart with no problem, and the car runs fine...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hi Steven, I have a '79 B with a recently rebuilt motor with a mild road cam, Weber 32/36 DGV 5A, de-smogged, and XR-700 electronic ignition. I am having the same issue that you described. I managed...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Can you check the brake servo? This works by allowing the vacuum in the inlet manifold to suck air from the servo diaphragm. This may be weakening the mixture just enough to cause the stalling,...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hi, Thanks for your reply. I did as i mentioned remove brake booster hose and plugged the hole at the manifold intake, but to no avail. I have tried to adjust the richness and idle speed on the Weber...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

have you looked around to make sure all the mounting bolts for the intake and carb are tight? Could still be like a vacuum leak, but you have removed the booster from the equation. You stated it...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hi Paul, I'm not sure about the charcoal canister (I only have one as far as I can tell - near the firewall next to the windshield washer bottle), but as far as I can remember, I disconnected...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hi Bill, It runs fine at idle no problem at all. When I start to decelerate from a brisk run, if I DON'T hit the brakes, but instead let it come to a stop by rolling, (with or without pressing on the...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Your fuel pump pressure sounds right and your flow rate is high, so, the engine is definitely not starving for fuel. According to an article in the library, the SU 300 series pumps were sized for 18...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Steven, I'm thinking your problem is the engine is idling on the mains (not the idle jets). For setting the mixture on the Weber downdraft, you need to get the idle under 800rpm, any higher and the...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hey Jeff, Thanks for that input. The car does idle fine in the driveway. I have tried (2 days ago) to rev it to 2000 RPM then again to 3000 RPM for a few seconds then letting go. It Idles fine after...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

I had the same problem you are having. It sounds like your idle circuit is lean. When you decelerate with the car in gear do you hear a burbling from the tail pipe? That is another indication of a...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

The problem definitely lies in the idle circuit with the addition of a low float level. The idle jet is becoming uncovered, with fuel, when you brake. RAY

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hi Clay, You may be correct, but here is my problem: With the high rise cam she does not idle at 800 RPM. Also, if I bring timing down much lower than the top notch on the cover - guessing about 20...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Steven, simply running fuel containing Ethanol can require a jet change to obtain a richer mixture. I ran a Weber DCOE for ten years. It took me two years before I finally got the mixture correct. A...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Thanks Guys, I will remove and clean the whole carb including the idle jets this weekend. Dave, I do get a burbling in the tale pipe when decelerating. This has been going on since I first installed...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hi Steve, Sounds like you are headed in the right direction. I did a lot of reading about the Weber 32/36 when I was fixing my stalling problems. While you are checking float level, look at the size...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

I guess to some extent It would. I have a stainless tourist trophy exhaust and I don't know how it compares to your exhaust, but when I got the jets correct the burbling went away. In reply to #...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Hey Ray, "Trial an error" is right. I had a 45 DCOE9 side draft in 1978 (before they came out with the 32/36). I remember they only had a long intake manifold and I could not run an air filter because...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Steven, I've been running the Moss supercharger system since they first hit the market. Up until that point, the 4 synchro/OD transmission, that I had also purchased from Moss, was the best thing that...

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Re: 1977 MGB Stalls when braking - PLEASE HELP

Dave, You said " I had to increase to .65 (for the primary idle jet) to get rid of the lean condition". Any ideas if the secondary idle jet needs changing. I thought according to the 32/36 literature...

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