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6C-34
1977 PONTIAC SERVICE MANUAL
Fig. 6C-56 ~ e m o v i n ~
~ h d k e ~ e v e r
( ~ F a l )
Fig. 6C-.57 Removing Intermediate Choke Rod (Typical)
B. Hesitation
1. Inspect pump plunger for cracks, scores or excessive
cup wear. A used pump cup will shrink when dry. Soak in
fuel for 8 hrs. before testing if dried out.
2. Inspect pump duration and return spring for being
weak or distorted.
3. check&
dirt in pump passages and jets, improper
seating of inlet or discharge balls, and scores in pump well.
4. Check pump linkage for excessive wear, repair or
replace as necessary.
5. Check power valve in pump well for leakage and
proper installation.
C. Hard Starting
-
Poor Cold Operation
1. Check choke valve and linkage for excessive wear,
binds or distortion.
2. Inspect choke vacuum diaphragms for leaks.
3.
Clean or replace carburetor filter.
4. Inspect inlet needle for sticking, dirt, etc.
5. Examine fast idle cam for wear or damage.
6. Also check items under "flooding".
Fig. 6C-58 Removing Fast Idle Cam
Fig. 6C-59 Power Piston
Fig. 6C-60 Float Bowl
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