On Fri, 19 May 2006 03:07:18 EDT, BCAH wrote
> Before I give advice over the phone to a new owner, I thought I
> would check on the collective wisdom on the list.Hot or cold, 1275
> runs rough with full throttle in first and second unless gas pedal
> is depressed rather slowly. Yes, 20W50 is in the dash pot. "Over
> the phone" is hard to figure out , but I am thinking too much
> rapid advance timing? The thing will apparently scream easily to
> 6500 rpm once it gets going. I'll be checking on it tomorrow,
> looking at the cheapest thing first, but rather than just start
> changing out parts, I thought I would hit something obvious first
> and look like an expert. Ignition, fuel,phase of the moon? Bob C
>
Bob -
1) Look at fuel delivery. A weak fuel pump, kinked fuel line, or stuffed
fuel filter will deliver fuel, but not fast. It might just be able to keep
up with gentle acceleration, but really jumping on the pedal can pull down
the float bowls faster than the pump can refill, making the mixture go lean.
2) Look at the balance between the carbs. If airflow or mixture is off
between the two, but the "composite" is OK, the car will run OK at idle, and
will continue to as long as the air flow through the balance pipe can keep
all 4 cylinders breathing through both carbs, but when you jump on it, each
pair of cylinders pretty much breathes through only 1 carb, which, if
they're unbalanced, can lead to a stumble.
I've seen cars with this set of symptoms with each of these problems.
Chris K.
Multiple Sclerosis 150 Mile "Pedal to the Point"
(Yes, 150 miles on a bicycle. No, I'm not a masochist.)
Sponsor Me! -> http://tinyurl.com/f48lg
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