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WHAT CAUSES STALLING UPON HARD BRAKING 700

posted by  invar on  Sun Oct 13 14:30 CST 2002
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Feb 26 21:00 CST 2010
[RELATED]

Check for vacuum leaks

From the FAQ:

Car Stalls When Brakes Applied: Vacuum Leak or FI Relay. [Query:] I am having a problem stalling under hard braking. I have had it checked for vacuum leaks and they appear OK. It only happens when the car is warm and I apply the brakes hard. [Response 1:] I would look in the direction of the power brake booster. Right after you brake, you fill up the booster with air, which has to be evacuated by the engine. If your idle is somewhat shaky, throttle plate is out of adjustment or you have a lazy idle air motor the idle can drop enough to stall it. The check valve in hose from intake manifold to booster has an arrow on it indicating the direction of installation Take it out of the line and suck on it to see it opens and shuts correctly. [Response 2:] Check the solder joints on the fuel pump relay. Cracked joints will sometimes cause a warm relay to drop out when the engine speed drops and the alternator slows and the system voltage drops.
--
Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'






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