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Re: Intermittent hesitation - like there's no gas for a second! 200 1986

posted by  someone claiming to be Zee on  Fri Nov 24 14:37 CST 2000 [RELATED]

OK, I found your post.

1. On the '86 you should not be hearing the fuel pumps "whirring" while your are driving, or even "hesitating" at a stop. A faint buzzing from the main fuel pump is normal, but you have to be sitting still and quietly to hear that. Aloud main fuel pump could indicate a failing pump, a clogged fuel filter, a malfunctioning in-tank pump, or a bad fuel pressure regulator. Where to start? Fuses. Be sure to install a BUSS (glass) fuse for each pump in place of the ceramic ones. Those can look OK, but be failed.

2. High speed miss usually indicates cracked spark plug. I notice your list of recent parts & services did not include ignition work.

3. Low speed, idle miss indicated a failed spark plug wire or coil wire. BTW, how is the coil?

4. Clogged fuel filter doesn't help. Get the fuel system pressure tested, too. Fuel pressure regulator could be a culprit. Pump relay, as someone mentioned.

5. Any recent throttle body service?

6. What is the idle speed?

7. OD problem could be a relay or bad wire someplace. trace the wires down to the OD solenoid, checking for cuts in the insulation.





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