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10/11/13 10:21pm - Original Message: 'Replaced Brake Booster Now Engine Stumbles / Dies When put In Gear'
mmesa005
Former Member
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Cameron Park, CA - USA

Vette(s):
Yellow 1974 Automatic

Joined: 10/4/2013
Posts: 5
I have a 74 with a stock 350. I just purchased the car last week with the power brake booster not working. This was changed today and now the car starts fine but after warming up and putting it in gear, R or D the RPM drops and unless I press on the gas it will die.

Help would be greatly appreciated!


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Regards,

mmesa005

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10/11/13 10:51pm - Reply: 'Re: Replaced Brake Booster Now Engine Stumbles / Dies When put In Gear'
Adams' Apple Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Welcome to C3VR!
Did it run ok before the booster swap?
Try blocking the vacuum hose going to the booster, and see if it still dies with it blocked. If it does NOT, the booster is bad. Ouch
Did the new booster come with a new check valve?


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Joel Adams
C3VR Lifetime Member #56    
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             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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10/11/13 11:07pm - Reply: 'Re: Replaced Brake Booster Now Engine Stumbles / Dies When put In Gear'
mmesa005
Former Member
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Cameron Park, CA - USA

Vette(s):
Yellow 1974 Automatic

Joined: 10/4/2013
Posts: 5
The car idled and went into gear without stumbling before the new booster was put in. I also had a problem with on of the headlight actuators and that was replaced as well.  

I pinched off the booster vacuum and no change, when I put the car in gear the idle drops and the car will die if I leave it there for more than a few seconds.  I checked the timing at it is as 8 degrees.




____________________________________
Regards,

mmesa005

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10/11/13 11:31pm - Reply: 'Re: Replaced Brake Booster Now Engine Stumbles / Dies When put In Gear'
mmesa005
Former Member
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Cameron Park, CA - USA

Vette(s):
Yellow 1974 Automatic

Joined: 10/4/2013
Posts: 5
UPDATE:

I leaned the carburetor and that seemed to help. I took it for a short drive and made a few stops to see if the car would idle without dieing. Seemed better but still didn't feel like a solid idle. 

A bit more background: The engine was recently rebuilt and has a new Edelbrock 1400 Series Carb. They also installed a new fuel pump and a Mr. Gasket fuel flow regulator with the dial set at 3.5. 

What should I do next?

Thanks!


|UPDATED|10/11/2013 8:31:47 PM (AZT)|/UPDATED|


____________________________________
Regards,

mmesa005

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10/13/13 11:01pm - Reply: 'Re: Replaced Brake Booster Now Engine Stumbles / Dies When put In Gear'
mmesa005
Former Member
- Send Private Message


Cameron Park, CA - USA

Vette(s):
Yellow 1974 Automatic

Joined: 10/4/2013
Posts: 5
The problem turned out to be a defective vacuum valve.

____________________________________
Regards,

mmesa005

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10/14/13 7:17am - Reply: 'Re: Replaced Brake Booster Now Engine Stumbles / Dies When put In Gear'
Adams' Apple Lifetime Member
Lifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19449
Check valve for the booster?
Glad ya got it fixed, anyway! Thumbs Up


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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