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08-11-2011
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#1 |
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Join Date: Jul 2009
Location: Texas
Posts: 791
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Engine Stumbles Under Full Power
With the power key on, in 1st gear, at around 5k RPM, I have a stumble. However in 2nd, I don't have a stumble at all.
The gas is over a year old but I did add two cans of octane boost so I am going to run this tank out first then put fresh gas 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 (SOLUTION: Gas was bad, new gas solved the issue - ZBrink) Last edited by ZBrink; 1 Week Ago at 05:23 AM. Reason: edited for clarity |
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08-11-2011
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#2 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,842
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Re: full power stumble
Does it happen with the power key off?
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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. Last edited by ZBrink; 1 Week Ago at 05:18 AM. |
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08-12-2011
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#3 |
 
Join Date: May 2008
Location: Okemos, MI.
Posts: 1,193
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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: 791
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Re: full power stumble
When I changed the pumps, it showed a half of a tank. I have since driven it with the new pumps about twenty miles.
This morning it was acting a little worse. I wanted to run more of the bad gas out but instead I went and put a fresh 10 gal in and the gauge registered a 1/4 shy of Full. It ran perfectly afterwards. Was it the bad gas or the fuel level? I hope I didn't bend the float when I put the pumps in. If I did how, do I reset it?? Dave Last edited by ZBrink; 1 Week Ago at 05:22 AM. Reason: edited for clarity |
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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: Mar 2004
Location: Found Member
Posts: 4,341
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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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#7 | |
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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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