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WHY AM I LOSING POWER ONLY BETWEEN 25 AN 45 MPH THEN IT RUNS FINE

I CHANGED THESE THING ,O2,PLUGS,WIRES,COIL,EGR VALVE ,TEMP SENSOR CLEANED THE THROTTLE BODY REALLY GOOD JUST AS I GIVE IT GAS AS I AM GOING ONLY AFTER I BEEN GOING FOR A FEW THE PEDAL ITS GOT A DEAD SPOT IN THE PEDAL BUT IF YOU GAS IT HARD FROM THE LINE ITS FINE OR IF YOU PUSH THE PEDAL HARD AT 25 YOU NEVER FEEL IT ONLY IF YOU GIVE IT LITE GAS AS YOUR GOING IT JUST GOS NO WHERE LIKE ITS GETTING NO GAS OR SOMETHING

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  •  FRANKIE GREENWALT
    FRANKIE GREENWALT Dec 12, 2012

    I REMOVED THE CAT ALONG TIME AGO AN ITS ALL THE TIME AND ITS A 1988 CHEVY SUBURBAN R20 454 WITH 44K MILES AN IT SAT FO

  • Adrian Jaramillo
    Adrian Jaramillo Dec 15, 2012

    ??? black smoke?? hard start? inspect plugs, see if black. check fuel pressure. this engine is a vortec motor. are injectors on outside of intake?? if not. one injector with 8 spider tubes to each cylinder. could have briken fuel line to injector, bad fuel regulator. is service soon light on? need codes if so. get scan test at auto zone for free. this vehicle should have cat converters. what else is missing..

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  • 308 Answers

What type of vehicle? need more information. cold okay? hot when problem is more noticeable?? possible plugged cat converter and or other possibilities..no more info..

Posted on Dec 12, 2012

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 1998 chevy blazer running really rough. It used

I had a similar problem and just happened to unplug the temperature sensor for the computer and the engine started running smooth.
So I replaced the temperature sensor and all was well!

Posted on May 19, 2010

  • 51 Answers

SOURCE: Chevy truck '02 surges between 45 and 55 mph

you should change the tps( throtal position sensor) this can cause that problem

Posted on Aug 15, 2009

arauzvictor1
  • 466 Answers

SOURCE: engine runs fine most of time then once in a while

It is best that you make a scanner to see if it gives you some code and do not keep changing parts for pleasure I recommend that if you measure the pressure of the gas pump when you feel the decision would be good for my doubts. Thanks

Posted on May 10, 2010

  • 450 Answers

SOURCE: multiple mis-fires. I changed the plugs, coil box,

have you checked the timeing belt also the bad gas does that to have your fuel filter checked

Posted on Sep 01, 2010

SOURCE: I have changed everything: Spark

There are three components that will enrich the fuel mix: 1)engine coolant temperature sensor. If this is not working or the signal is interrupted by a wire breakage then the engine will run rich. The coolant sensor informs the ECU (high resistance) that the engine is cold at start up and so the ECU responds by increasing the fuel injection cycle to enrich the fuel air mix. Later on as the engine warms the resistance of the coolant sensor drops and the injection cycle is reduced by the ECU. If the sensor is faulty or has become disconnected (wire break or corrosion of the socket pins) the ECU assumes that the engine remains 'cold' and the engine runs permanently rich. 2) O2 sensor, operates completely independently of the EGR, if it is faulty and signals 'too much oxygen' then the ECU will significantly enrich the fuel mix to try and balance what it thinks is an excess of air. 3) Fuel pressure regulator. If the diaphragm has broken or there is a leak in the vacuum line this will result in higher than needed fuel pressure in the fuel rail at idle. The vacuum line acts against the spring pressure holding the valve closed. At idle, the inlet vacuum pulls back on the diaphragm reducing the fuel pressure required to open the valve. Low fuel pressure coupled with short duration injection times will mean a lean mix at idle. If the vacuum is compromised or the diaphragm damaged then the increase in rail pressure will make the fuel mix very rich to point of flooding the engine

Posted on Nov 02, 2010

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