Enrichment Under Accel. During Warm-Up

SYSTEM FAILURE SYMPTOMS:
Hesitation on acceleration for the first few minutes of operation, often accompanied by backfiring into the intake manifold.

TEST:

1. Plug in the pump and pulse relays (pump and F relays).

2. Connect a test light between the cold start injector plug (brown wire) and ground (do not remove plug from cold start valve).

3. Start the engine. Every time the throttle is opened rapidly, the test light should flash briefly.

4. If inoperative, check

a) Power to the vacuum impulse switch
b) Vacuum at the impulse switch
c) Electrical, mechanical function of the switch