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Author
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Topic: Engine running rough? Help
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Wingfoot
Journeyman Posts: 1
From: Fort Smith, AR, USA
Registered: Oct 2002
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posted 10-04-2002 11:28 AM
   
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
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posted 10-04-2002 12:19 PM
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
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posted 10-05-2002 07:41 PM
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
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posted 10-05-2002 08:16 PM
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.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA/MCA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
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Part time secret agent license #0089
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The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
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