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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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...
View ArticleRe: 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,...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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 #...
View ArticleRe: 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...
View ArticleRe: 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...
View ArticleRe: 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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