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Old 12-30-2010, 05:46 PM
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Difficult to turn at an idle.

When i'm driving slow and the engine is close to idle speed, maybe a couple hundred rpms higher, it gets quite difficult to turn the car. It's not a constant difficulty though, it kinda goes a little at a time. Does anyone know what would cause this?

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Old 12-30-2010, 05:47 PM
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Btw, it's a 78 firebird with a chevy 350.
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Old 12-30-2010, 05:53 PM
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I'm guessing you checked the fluid? Other than that a bad pump?
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Old 12-30-2010, 05:57 PM
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The fluid level is fine. So it's gotta be the pump i guess?
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Old 12-30-2010, 06:03 PM
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Quote:
Originally Posted by bigdog7373
The fluid level is fine. So it's gotta be the pump i guess?
That would be my guess. Is it a very old pump? Good thing they are not that expensive. Easy thing to try I guess. The belt isn't slipping is it? Im sure you would hear it.
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Old 12-30-2010, 06:12 PM
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Yup, i'm pretty sure it's original from 78. Well i guess i'll add that to my lift of crap that's wrong with the car. I'm gonna need another sheet of paper soon!
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Old 12-30-2010, 06:15 PM
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Pulley ratio between crank and pump isn't turning pump fast enough. You may need to put a larger crank pulley on the engine. Make sure belt isn't slipping also.

You could just turn up the idle speed a bit, below 850 rpm tends to cause this problem if crank pulley is only 6-1/2" to 7" diameter.

If it was originally a Pontiac engined car the Pontiac engine has a larger diameter crank pulley.
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Old 12-30-2010, 06:18 PM
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It has a smaller crank pulley that the original 305 that was in the car. I tried making it idle faster today. It was idling at 950rpm in gear and still did it. I guess the pump is finally shot after 32 years.
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Old 12-30-2010, 06:25 PM
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Quote:
Originally Posted by bigdog7373
Yup, i'm pretty sure it's original from 78. Well i guess i'll add that to my lift of crap that's wrong with the car. I'm gonna need another sheet of paper soon!
At least you can drive it! I got my elky with no engine or trans. Plus it was sitting for maybe 20 years. My list is longer! Let us know what the fix was.
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Old 12-30-2010, 06:30 PM
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Yea i don't think i'll be fixing it though. I'm trying to sell it right now. I guess i'll just lower the price again.
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Old 12-30-2010, 06:59 PM
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Quote:
Originally Posted by ericnova72
Pulley ratio between crank and pump isn't turning pump fast enough. You may need to put a larger crank pulley on the engine. Make sure belt isn't slipping also.

You could just turn up the idle speed a bit, below 850 rpm tends to cause this problem if crank pulley is only 6-1/2" to 7" diameter.

If it was originally a Pontiac engined car the Pontiac engine has a larger diameter crank pulley.
X2 Eric Or a pump going south on you. JMO


Cole
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