Question about 2004 Chevrolet Blazer

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When driving my 2004 blazer s-10 LS rpm's will rocket up 4000 or futher but I will have no power or acceleration. Doesn't really matter the gear your in or the speed your going though it happen more at high way speeds.

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Faulty throttle position sensor

Posted on Jul 12, 2011

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I have a 2004 dodge neon that I pressure washed the engine in. After doing so it would run and sounds fine till it hits 4000 rpm. the it just bogs down.It wont rev over 4000 rpm no matter what I do to...


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Not driving a corvette? Just kidding. More details are important. How slow is your acceleration? Is it 0-60 in 8 seconds, or 20 seconds? What is redline on your car? If redline is 5K then 4000 is a good responsible shift point. If redline is 8K then shifting at 4000 is probably robbing your engine of it's torque and horsepower band. I believe the GTS model has an 8K RPM redline, the GT may be lower, but in that case, shifting at 4K is too soon for strong acceleration. Your Tachometer should have redline clearly marked. For responsible use, stay below that, maybe 10-20%. For economy stay further still, but for power you need to let the engine use it's RPMS, especially smaller and fewer cylinder engines usually don't make their power until they are half way through the RPM range and above.

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I just purchased a used 2004 Chevy Impala LS from a dealer with 46,000 miles and the car misfires at 4000 rpm's whether in park,neutral or driving on highway without any warning lights or codes....


check firing order of the plug leads as 2 may be crossed Have a fuel pressure test done on the fuel system check coil/s condition as it may be braking down at revs.

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Neutral or Drive N rev limiter to prevent engine damage from no load over acceleration. D: many things could be at fault. Has your fuel filter been changed in the last 30,000miles. What about a tune up? Is your CEL(Check Engine Light) on? If so have a parts store check for codes, some do it for free. Then get back to us and we can go from there.

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sounds like a catalytic converter - runs good but lacks power - the back pressure keeps the engine from being able to accelerate under load - good luck :O)

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