swapping to FI

[1988montess]

i got the exhaust done today, it sounds amazing and it feels 100 % better. the guy said the cat was really bad. i will let you guys know how the mileage is on it so far so good though.

 

[megaladon6]

ok, i thought you were just doing post cat. i'd drive it for a tank and then pull a spark plug or two. just see if they have black gunk, a black coating, glazed white or are brownish white. this way you can tell the approximate air/fuel mixture and engine efficiency.
good luck!

 

[1988montess]

it is now catless. its a hidden exhaust ill post crappy pics later...

 

[pontiacgp]

I don't know what the fines in your area are for not running a cat but as far as performance goes there are free flow cats that won't diminish the performance at all....

 

[1988montess]

no fines. we dont have emissions here

 

[79LT1Monte]

In my opinion swapping to a newer vortec setup would be well worth the extra time. We swapped one into my buddies truck and it was a breeze, we didn't have to hook up more than 5 wires and it purred like a kitten. They have a smooth idle and a ton of low end torque. If you are upgrading to an overdrive at the same time with this swap you will get even better milage. I swapped my carb and three speed for an LT1 and 4L60 out of a 1996 Caprice and it was an easy swap and cruising to Kansas City last year for the Super Chevy Show I got 24-26 mpg with several wide open runs. That mpg suffered greatly with the 3:73's I run now but it was worth it for the 60 ft times. Like I said this is just my opinion but the reliability in all four seasons is why I swapped to FI from a carb, and If you are mechanically inclined enought to go this route over a kit I think you will be happier. Once you buy a kit you will be somewhat dependant on that company for replacement parts or help. If you pull everything from another truck or car you know what to buy replacement parts for or what forum to get help from.

What did you do as far as a fuel pump, etc?

I used a Holley Blue inline electric pump and had a return line soldered into my factory pick-up. I was going to run a complete tank from a fuel injected car but couldn't locate one for the right price. I would like to have the baffles but so far I have had no problems.

 

[1988montess]

so my gas mileage is friggin horrible still.i put in a little over 31 litres( i dont know how many gallons that is) and i got about half a tank i drove MAX 130 km ( about75-80 miles) and im right back down to pretty much empty. what the hell can i do? i still havent checked the o2 sensor i guess i should do that, but what else. also my car is sputtering usually when im accelerating between 80-110 kmh....HELP!!! also my choke light keeps turning on and off!!!! WTF

 

[megaladon6]

do the o2 sensor, they're only about $30. did you pull the plugs again to check the color? with a bad mixture the plugs can go bad VERY quickly.
it's starting to sound like a bad carb/mix control solenoid (in the carb) or a bad tune. but those will all be affected by a bad o2 sensor.

 

[pontiacgp]

for your choke lite check the connection at the choke coil on the carb and the condition of the wire....the lite comes on if the wire is not grounded to the choke coil...