C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

bogging down

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Old Oct 1, 2004 | 09:55 PM
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Default bogging down

Hi guys

I`ve got a 94 that has been acting strange, this past week a few times when i hit the gas the car will bog down and ping a few times then take off, it doesn`t happen all the time but enough to aggravate me. It has had opti, tune up, fuel filter and o2 sensors about 10 months ago. I only use 93 octane also. Hoping its not the opti again, any suggestions?
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Old Oct 1, 2004 | 11:04 PM
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define 'tune up'
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Old Oct 2, 2004 | 08:06 AM
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plugs, wires, new opti the usual stuff
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Old Oct 2, 2004 | 09:03 AM
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I had and again have the same problem on my 93. Just putting the engine under a minor load would cause it to stumble. Under hard acceleration from a stop it would stumble really bad. Gas mileage went from 25 highway to 19 and performance was way off. Before the weekend that I planned to work on it the computer finally threw a code. Bad 02 sensors. Replaced them and after a couple days driving it was back to it's old self. 25 mpg and running strong. Lasted for over a week but yesterday the wife drove it to work and the a/c quit and the engine started to stumble and run poorly. Computer was showing no codes so I disconnected the battery cable last night to clear the a/c problem and the car runs better now and the a/c works but still has a minor stumble under moderate load. I have to work on the 90 this weekend so maybe next weekend I can get to the 93.
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Old Oct 2, 2004 | 09:13 AM
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George...how many miles on your opti? That sounds like what mine does when the opti's about to go.

twkeough...How do the plugs look?
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Old Oct 2, 2004 | 10:06 AM
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I haven`t pulled the plugs yet. I did just pull the maf and clean it and the throttle body but haven`t driven it yet
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Old Oct 2, 2004 | 10:49 AM
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This may be overly simplistic...but have you checked the air filter? If it's real dirty...it could cause the symptoms you're describing...
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Old Oct 2, 2004 | 05:29 PM
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when i took off the maf i checked the filter...clean. Everything i been reading on the web seems to point to the maf. I think i`m gonna drop it off to have the mechanic see what he thinks
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Old Oct 2, 2004 | 09:22 PM
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Originally Posted by Alchemist
George...how many miles on your opti? That sounds like what mine does when the opti's about to go.

twkeough...How do the plugs look?
The opti looks to be original, 105K so it is probably on it's last legs.
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