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  Engine running rough? Help

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Author Topic:   Engine running rough? Help
Wingfoot
Journeyman

Posts: 1
From: Fort Smith, AR, USA
Registered: Oct 2002

posted 10-04-2002 11:28 AM     Click Here to See the Profile for Wingfoot   Click Here to Email Wingfoot     Edit/Delete Message   Reply w/Quote
I have installed a newly rebuilt engine from Jasper Engines (302 with a mild cam). I put on my Edelbrock Performer manifold and a 600 CFM Edelbrock carburetor. I have a slight miss in the engine and the header tubes on number 4 & 7 run cooler than the others. I have moved plugs and wires and checked compression on all cylinders (all are ~ 155 lbs). I suspected a vacuum leak since the two cylinders use the same runner on the manifold but after replacing the gasket and for the second time and insured a good seal I have all but eliminated a leak? I need help! Does anybody have any ideas of what to do next other than take the car to a REAL mechanic? Thanks

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indyphil
Gearhead

Posts: 877
From: Lafayette, IN, USA
Registered: Jul 2002

posted 10-04-2002 12:19 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
It sounds like you have been thorough, but check the ignition specs (dwell and timing) just to make sure its not that.

The idea about a leak is interesting. I have the same manifold as you, that runner has a plug on the top for connecting vacuum bosses to, check the plug for leaks or the brake booster or whatever you have attached to the manifold vacuum. You can use a little mity-vac tester to test your vacuum lines.

After that I assume you have played with the carb idle screws and set up the mixture to be correct (it sounds like you had the carb and intake working fine on a previous engine)

seems like you have done all the right things. I cant help you much.

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SuperDave
Gearhead

Posts: 123
From: Tacoma, WA USA
Registered: Jun 2000

posted 10-05-2002 07:41 PM     Click Here to See the Profile for SuperDave   Click Here to Email SuperDave     Edit/Delete Message   Reply w/Quote
An "el cheapo" idea would be to switch the spark plugs. You may have a mis-firing spark plug. Yes, it could be that simple!

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 10-05-2002 08:16 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Welcome to M&M Wing dude !
Have you tried adjusting the carb mixture screws? Try turning them out and see if the idle picks up.

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