1992 chevy 1500 with 8mpg

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

it has a 350 with a 700r4 tranny it has a 350 with a 700r4 tranny

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. 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.

i also repalced the regulator and injectors i also repalced the regulator and injectors

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

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

the base timing was fine. the base timing was fine.

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

the old spark plugs where all sooty the old spark plugs where all sooty

where woulld the choke be at on the throttle body? where woulld the choke be at on the throttle body?

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

the only thing i havent replaced was the computer the only thing i havent replaced was the computer

ok



Is the truck missfiring








therealgraha

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

He has done everything under the hood.


ok

Is the truck missfiring


therealgraha what do you think...he has got a strange one.. He has done everything under the hood.

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



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

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 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

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... 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/technical/diagnosis.htm

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

I would have to say. Try what therealgraha suggested. I would have to say. Try what therealgraha suggested.

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. 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.

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

http://www.fueleconomy.gov/feg/bymodel/1992_Chevrolet_1500_Pickup.shtml

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