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11-19-2006, 06:32 PM
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#1
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Registered User
Join Date: Jan 2006
Location: Westchester, NY
Posts: 24
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Car runs awful
This is a 1995 z28, built 383 with about 20,000 miles on it. At idle the rpms will bounce from 1000 to 1500 sometimes it gets lower and the motor just dies out. When it does this it'll take a while of cranking over until it fires up again and then throttle response sucks, i'll punch the gas and it'll stumble as it rises in rpm. While driving it'll stumble like this and looses power horribly. The car sat for maybe 3.5 months, could the gas have gone bad within that time and done damage to the fuel system? I also noticed a funny rotten egg smell and its not an exhaust without cats like smell, it's slightly different. Anybody have any thoughts on this? Thanks.
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11-19-2006, 06:47 PM
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#2
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Registered User
Premium Member
Join Date: Sep 2000
Location: TX
Posts: 4,658
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Gas shouldn't go bad in 3.5 months. I'd drain the tank anyway and put in some fresh gas to rule it out as a cause.
__________________
Polo Green Metallic 97 Z28 M6
Arctic White 96 SS M6 (Should be here VERY soon.)
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11-20-2006, 12:47 AM
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#3
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Registered User
Join Date: Jan 2006
Location: Westchester, NY
Posts: 24
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Just noticed that if I unplug the MAF sensor, it does not stumble nearly as bad as it was with it pluged in.
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11-26-2006, 12:19 AM
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#4
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Registered User
Join Date: Sep 2006
Location: Barboursville, WV
Posts: 122
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A couple of things come to mind from the problems you seem to be having,
1. Optispark
2. Fuel Injectors could be dirty/going bad
3. Fuel Pump going bad.
4. Check your fuel pressure, make sure it's around 43.5psi I believe
5. Check all plugs/wires to make sure they aren't fouled.
PS. Gas shouldn't go bad in 3 months, especially if it is 93+Octane Gas
-Dax
__________________
D. Adkins -
94 Red Z28 with black Stripes, K&N CAI, Ported MAF, Aluminum IE, Aluminum FlyWheel, New Spec Stage 2 Clutch, Cross Drilled & Slotted Rotors, Pro 5.0 Short Shifter, TB Coolant Bypass, Flowmaster Catback with Tips, Blackout Tail Lights.
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11-26-2006, 12:29 AM
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#5
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Registered User
Join Date: Dec 2004
Posts: 202
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Does it sound like it is misfiring at all or just surging idle? Did the car sit in the open outside?
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12-09-2006, 06:10 AM
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#6
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Registered User
Join Date: Mar 2000
Location: Phoenix AZ
Posts: 811
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Sounds like the problems I'm having with mine
__________________
Josh
1996 Red Z28 Vert A4-K&N CAI, TBB, Pacesetter LTs with ORY, Flow 80 muff, MSD wires, TR55s, Chrome Valve Covers
2005 Silver Pontiac Vibe-Wife's
2004 Blue Yamaha R1  -Micron Slips and other stuff.
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