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08-11-2011
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#1 |
 Join Date: Jul 2009
Location: Texas
Posts: 793
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full power stumble
In first when I have the power key on at around 5000rpm I have a stumble. Now in second I dont have a stumble at all. Now the gas is over a year old but I did add two cans of octane boost so I am going to run it out first and put fresh in to see if I have a fuel issue. I just replaced the pumps and I hope that isn't the issue cause man that was hard to get back in. I also checked the pumps and checked the check valves.
Dave Last edited by mgbrv8; 08-11-2011 at 11:30 PM. |
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08-11-2011
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#2 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: full power stumble
Does it happen with the power key off?
H
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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08-12-2011
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#3 |
Join Date: May 2008
Location: Okemos, MI.
Posts: 1,189
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Re: full power stumble
FWIW, Last year I had the fuel pumps replaced in my car. During the intial drive home from the repair facility, I had a similar stumble when I tried to accelerate past traffic or overtake a vehicle. Once I got the car home and refueled the car, the problem never repeated. I don't know if it was because of pressure in the tank or what but it never ocurred again.
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Joe Thomas Corvette Club of Michigan NCRS-Michigan Chapter Member NCM Master Ambassador NCM Lifetime Member Former NCM Board Member 1991 ZR-1 Melon Copper Metallic/Black 1992 ZR-1 Bright Red/Black (Sold) 1995 ZR-1 Bright Aqua/Gray (Sold) 2012 ZR1 Super Sonic Blue / Dark Titanium |
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08-12-2011
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#4 |
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Join Date: Jul 2009
Location: Texas
Posts: 793
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Re: full power stumble
Okay when I changed the pumps it showed a half of a tank. Now I have driven it with the new pumps about twenty miles, now this morning it was acting a little worst. I wanted to run more of the bad gas out but i went to put some fresh in. I put 10 gal in and it registered a quarter shy of full. I didnt want to fill it up just in case I have to pull the pump again. It ran perfectly afterwards. Now was it the bad gas or the fuel level. I hope I didnt bend the float when I put the pumps in. If I did how do I reset it??
Dave Last edited by mgbrv8; 08-12-2011 at 04:12 PM. |
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08-19-2011
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#5 |
 
Join Date: Feb 2006
Location: San Antonio area
Posts: 1,179
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Re: full power stumble
bad/old gas - damned E10 stuff has no shelf life - say 6 months or less. My 91 was bogging badly after a heat soak restart and with some fresh fuel today it's back to normal.
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“Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer |
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08-19-2011
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#6 | |
Join Date: May 2005
Location: Georgia Mountains
Posts: 926
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Re: full power stumble
Quote:
 George |
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08-19-2011
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#7 |
Join Date: Mar 2004
Location: Found Member
Posts: 4,346
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Re: full power stumble
Good read on the subject of E10.
http://www.fuel-testers.com/expirati...hanol_gas.html
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
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08-20-2011
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#8 | |
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Join Date: Feb 2006
Location: San Antonio area
Posts: 1,179
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Re: full power stumble
Quote:
And I heard that more corn is used for ethanol than food now. I used to be a midwest farmer so I can empathize with them, but federal subsidies to brew ethanol ... what will they think of next, subsidies to grow nothing? Oh, never mind, I just remembered "Kennedy hay" from the early 1960s; farmers paid to grow acres and acres of weeds on fallow land. end of rant and, yes 
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“Buy the best example of what you want, and pay whatever it takes. That way, you cry only once.” ~ Bruce Meyer |
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