07-30-2010, 08:19 PM | #1 |
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Sick Engine
Need some advice and things to check for.
My 31 Rdstr isn't running well. Lack of throttle response, backfiring through the carb. Necessary to have GAV open almost a full turn in order to get engine to run smooth. Last time I drove it best speed was 35 MPG with throttle to the floor. Starts good. What should I be checking? Thanks in Advance for your thoughts |
07-30-2010, 08:30 PM | #2 |
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Re: Sick Engine
I woiuld check for:
Fuel restriction (crud in line or carb somewhere), Bad Coil, Bad Condenser, or timing problem. One of these would probably be my first guesses. |
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07-30-2010, 08:52 PM | #3 |
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Re: Sick Engine
If it turns out to not be a fuel delivery or ignition/timing problem, check for a possible bad intake manifold to block gasket or a head gasket leak between 1&2 or 3&4. Do you have a vacuum gauge and a compression tester?
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07-30-2010, 08:52 PM | #4 |
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Re: Sick Engine
For sure, check the fuel supply. Disconnect the line going into the carb, Either put an appropriate size hose on it or hold it over a can and have someone turn on the gas valve on and check the flow. It should be a very solid stream. Also check that the gasket in the gas cap hasn't plugged the vent. Let us know what you find!
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07-30-2010, 09:28 PM | #5 | |
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Re: Sick Engine
Quote:
Rainmaker Ron |
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07-30-2010, 09:38 PM | #6 |
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Re: Sick Engine
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07-30-2010, 11:30 PM | #7 |
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Re: Sick Engine
Thom, Try turning the small mixture screw on carb when engine is idling, if you don't see or hear any difference, Rainmaker Ron hit it right on the head--- Air leak!
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07-30-2010, 11:37 PM | #8 | |
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Re: Sick Engine
Quote:
In this case would someone try to use a propane torch (not lit) and wave it around the area where the leak is suspected to see it engine increases speed?
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07-31-2010, 08:01 AM | #9 |
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Re: Sick Engine
I would think a spray can of WD40 would be A LOT SAFER! JMO
Paul in CT |
07-31-2010, 09:51 AM | #10 | |
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Re: Sick Engine
Quote:
Though it is very flamable I think that starting fluid works best, it evaporates quick and won't stain the engine. If there is a vacume leak it will tell the story right now. |
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07-31-2010, 11:17 AM | #11 | |
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Re: Sick Engine
Quote:
Rainmaker |
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07-31-2010, 12:18 PM | #12 |
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Re: Sick Engine
Possibly h/gasket , but more likely weak mixture. as well as above suggestions I've been caught out by having no vent on gas tank cap. Whoopsy.. swapped gas cap (which is vented) and rad cap (which isn't vented)! Doh!
Last edited by johnbuckley; 07-31-2010 at 12:24 PM. |
07-31-2010, 04:45 PM | #13 |
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Re: Sick Engine
Could also be float at wrong level causing lean mixture.
Marc |
07-31-2010, 04:58 PM | #14 |
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Re: Sick Engine
It may be something simple as the main jet stopped up. Especially if the car has not been driven for a while. Gas will evaporate through the jet and leave a residue. The new gas is nasty stuff.
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08-01-2010, 06:35 AM | #15 |
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Re: Sick Engine
Here is a easy way to test for vac leaks hold you finger over the carb, do not completely cover it slowly close you fingers covering the opening if a vacuum leak is there the motor will rev up, if not will choke down
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08-01-2010, 10:10 PM | #16 |
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Re: Sick Engine
I agree with john stone above.
Jim 160b sw fordoor |
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