Question about 1992 Chevrolet C1500

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1992 chevy 1500 with 8mpg

I have a 1992 chevy sport truck and ever since i have owned it has only gotten about 8mpg i have changed the maf sensor, oxygen sensor and all of the sensors on the trottle body but still didnt help i had a tune up recently so it couldnt be that i just need some help because gas prices are on the rise

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  • bigbill011 May 26, 2009

    i cant turn my cruise control on because there is something wrong with my brakes but going about 55mph its running about 1500rpm

  • bigbill011 May 26, 2009

    it has a 350 with a 700r4 tranny

  • bigbill011 May 26, 2009

    it have the same size tires as the stock ones the alignment it good on it. We had to change the head gaskets on it but i dont think that that would have anything to do with it, it also has the flowmaster system frome the cat back but we removed the cat on it.

  • bigbill011 May 26, 2009

    i also repalced the regulator and injectors

  • bigbill011 May 26, 2009

    the cat had no sensors that went to it, i made sure of that before i removed it

  • bigbill011 May 26, 2009

    i can check the timing but the fuel pressure regulator is new

  • bigbill011 May 26, 2009

    the base timing was fine.

  • bigbill011 May 26, 2009

    it smells like normal exhaust at the back of the truck.

  • bigbill011 May 26, 2009

    the old spark plugs where all sooty

  • bigbill011 May 27, 2009

    where woulld the choke be at on the throttle body?

  • bigbill011 May 27, 2009

    i also bought the new idle air control vvalve and the ecu and throttle positioning sensor

  • bigbill011 May 27, 2009

    the only thing i havent replaced was the computer

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    ok



    Is the truck missfiring








    therealgraha

    what do you think...he has got a strange one..

    He has done everything under the hood.


  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    this is now called the idle valve The realgraha also had asked if you had disconnected the spout connector when you checked the timing



  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    did you look at the pictures. do you think that the choke maybe stuck... I am siting beside myself. not unless you are leaking fuel from the return from the plenum or fuel rail. back to the tank when you are driving

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    What the heck... That is horrible gas mileage for all the things you have done. you should be getting at least 14 ok ok ok... have you pulled the spark plugs to check if there is fuel on the spark plug. or if you look on the old ones we can inspect to see what has been going on. Ihere is a website that has spark plug wear diagnostic



    http://www.spark-plugs.co.uk/pages/techn...

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    can you smell unburnt fuel at the back of the vehicle?

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    I would have to say. Try what therealgraha suggested.

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    I can only assume of why fuel economy could go down with the removal of a cat. converter.

    1. your old cat. converter may have had a pre or post cat. converter o2 sensor in it, and that sensor hasn't been reinstalled. causing your engine to not preform properly due to the lack of an o2 sensor.

    2. without the cat. converter you may have another post cat. converter o2 sensor that is trying to correct the engine. since the cat. converter is gone its not reading correctly causing it to adjust the engine incorrectly, which may lead to poor fuel economy.

    remember the function of the cat. converter is to try reduce the tail pipe emissions. the o2 sensors detects the amount of unburnt fuel (in short) and tries to adjust the engine so that is will have less unburnt fuel going through the exhaust system, causing less tailpipe emissions. also the computer maybe telling the engine to run richer to allow fuel to dump onto the cat as to allow it to heatup for a hoter burn to drop o2 emmisions.



    I am not sure if the your ccm maybe sending a signal to ****** or advance timing but if you go to the back of the vehicle you might be able to smell unburnt fuel.

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    you should be getting at least 12-14 mpg look here



    http://www.fueleconomy.gov/feg/bymodel/1...



    are the tires original size and properly inflated. also how is the alignment. I have the same truck and I am at 17mpg and I use the tornado

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    what is the size of the engine?

  • Raymond Ramirez
    Raymond Ramirez May 11, 2010

    I might have a question. does the vehicle switch to the highest gear when crusing?

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A lot of shops don't check base timing on the distributor. it could be the timing is set too low, or the module is not advancing{inside distributor} or another comon problem is a tear in the fuel pressure regulator. so pressure is too high all the time.

Posted on May 26, 2009

  • 1 more comment 
  • therealgraha May 26, 2009

    have someone check the base timing. on that truck it should be 0degrees. if it is set higher the timing will not advance properly

  • therealgraha May 27, 2009

    the idle valve replaces the choke. did you disconect the spout connector when you checked the timing?

  • therealgraha May 27, 2009

    not having the cat, might hurt you fuel ecnomy around town, but it won't effect your highway driving. what sort of driving do you do? you need back pressure from a dead stop. if all your driving is in town, that could be your problem.

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