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Mighty demon 650 acting up

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Old Feb 4, 2008 | 10:32 AM
  #1  
84 z28's Avatar
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From: Rochester NY
Car: 1984 z28
Engine: 355
Transmission: 700r4
Axle/Gears: Moser 9" 4.11
Mighty demon 650 acting up

During the summer my car started acting up. When i first put the new carb on it only took 2-3 pumps to get the car started. At the end of the summer it wouldnt start with 2-3pumps I had to hit the gas pedal to WOT until the car started ( only took about 10-15 seconds). Would it be time for a rebuild on the mighty demon ??
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Old Feb 4, 2008 | 11:40 AM
  #2  
xpndbl3's Avatar
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From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: Mighty demon 650 acting up

are your plugs fouled out? Are the float bowls draining back over night and you're trying to start the engine without the carb filled? How's the timing? My carb car starts up within 3 seconds of cranking usually, so something isn't right on your setup.
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Old Feb 4, 2008 | 11:47 AM
  #3  
84 z28's Avatar
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Joined: Apr 2006
Posts: 1,801
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From: Rochester NY
Car: 1984 z28
Engine: 355
Transmission: 700r4
Axle/Gears: Moser 9" 4.11
Re: Mighty demon 650 acting up

Plugs are fouled its been running rich since i got it and it has the stock jetting in it. timing is set at 36 degrees. And i dont think the bowls are draining.
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Old Feb 4, 2008 | 01:46 PM
  #4  
EvilCartman's Avatar
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From: Northern CA.
Car: '82 Z28
Engine: 350
Transmission: TH400 4,000 stall
Axle/Gears: Currie 9", 4.56 gears
Re: Mighty demon 650 acting up

I think it's about time you tuned the carb and put a fresh set of plugs in.
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Old Feb 4, 2008 | 02:01 PM
  #5  
84 z28's Avatar
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Joined: Apr 2006
Posts: 1,801
Likes: 21
From: Rochester NY
Car: 1984 z28
Engine: 355
Transmission: 700r4
Axle/Gears: Moser 9" 4.11
Re: Mighty demon 650 acting up

Think it just might be bad plugs ?
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Old Feb 4, 2008 | 03:39 PM
  #6  
xpndbl3's Avatar
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Joined: Jan 2002
Posts: 13,622
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From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: Mighty demon 650 acting up

no bad tune which fouls out the plugs. you need fresh plugs and to tune the carb.
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