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Post by jboisvert on Apr 1, 2008 13:27:43 GMT -7
Hello,
jboisvert here. I just joined this week and need some advice. The '61 pickup with a 283 V8 has just been tuned with new plugs, points, condensor, fuel filter, dwell was set, rpm's set and timed according to manual specs. The truck hesitates while driving it, both cold and hot. It has a lot of power, no knocking, but hesitation when I accelerate. Anyone know how to solve this? Is the timing not advanced enough? Is the air to fuel mixture not correct? Let me know what any of you think. I'd appreciate it.
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Post by 3onthetree on Apr 1, 2008 19:29:20 GMT -7
Mine does that in second gear, i dont know why tho
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Post by riverracer on Apr 1, 2008 21:27:48 GMT -7
You did everything but the carb, you have a bad accelerator pump!..
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Post by Dave Young on Apr 2, 2008 2:17:32 GMT -7
You did everything but the carb, you have a bad accelerator pump!.. I second that. There are several types out there. The only one I have any experience with is the "plunger" style. Mine has a leather seal. It's relatively common for those to dry up, if unused for an extended period. This causes them to shrink up a little and they lose their seal. If that is indeed the problem, it's a relatively easy and painless fix. Here's a little more info. about accelerator pumps, if you're interested. www.mustangandfords.com/techarticles/mufp_0603_ford_carburetors/accelerator_pump.html |
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Post by jboisvert on Apr 2, 2008 15:39:03 GMT -7
I didn't mention that included in the tune-up I installed a new Rochester Carb. So, could the accelerator pump be bad on a rebuilt carb? Could the spark plug wires be arcing because it feels and sounds like the plugs are missing or something?
jboisvert
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Post by joek3167 on Apr 3, 2008 5:02:33 GMT -7
you could have a vacuum leak but it i would lean more on the accelereator pump
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Post by Dave Young on Apr 3, 2008 8:06:12 GMT -7
Manual or Automatic transmission? If it's Manual, does it still hesitate at high RPM's? If so, spark plug wires may be grounding on the exhaust manifolds or something like that. With an Automatic, it's harder to notice. You could always run the engine at night with all the lights off and see if anything lights up. I'm kinda grasping at straws here, but it's a thought.
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Post by riverracer on Apr 4, 2008 20:33:37 GMT -7
None of that has to do with a stumble, it's a carb problem either a bad accelerator pump or it needs to be adjusted!.... As far as the other symptoms goes, give it a full tune up!...
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Post by jboisvert on Apr 6, 2008 12:39:43 GMT -7
Thanks for all your help. I did give it a full tune-up and bought new spark plug wires and that did the trick. Some were touching the intake manifold so were burned (not all the way through) and some were split. I bought longer wires so they could be rerouted away from the engine. She flies now!!!
jboisvert
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Post by Dave Young on Apr 7, 2008 0:48:45 GMT -7
Glad to hear it. I had a similar problem with my truck. Started the engine, turned off the lights, and that thing lit up like a Christmas tree.  I had to make my own custom length wires, tho. For some reason, they don't make a set that fits my engine, the way I have it configured. |
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I had to make my own custom length wires, tho. For some reason, they don't make a set that fits my engine, the way I have it configured.