gas mileage

Currently getting 12.5 mpg city. Granted it's been real cold out lately.
This time I purposely didnt let it idle for periods of time to be more accurate.
I see a lot of others says 13-15 city and 20-26 highway.

Am I far enough off so I should think theres an issue?
I've done PCV, Fuel Filter, & Air Filter. Engine is running smoothe so I'm trying to avoid doing plugs and wires till it's a little warmer out. Low on cash too.

thanks

J

Holy crap~!

I just read the 98 4.3 LT takes 4 02 sensors! 2 on each side. 2 in front of the cat, and 2 in back!

At $53 a piece (which is cheaper ones) that's over $200!!!!!

Anyone done all four? Anyone notice a difference in mileage?

I would imagine if the O2 sensors were bad you would be getting a check engine light. How many miles do you have? Once you change the plugs, wires it may go p quite a bit. Try running some fuel injector cleaner through it and see if it helps. Try LUCAS fuel injector cleaner- it works pretty well. Good Luck

I would imagine if the O2 sensors were bad you would be getting a check engine light. How many miles do you have? Once you change the plugs, wires it may go p quite a bit. Try running some fuel injector cleaner through it and see if it helps. Try LUCAS fuel injector cleaner- it works pretty well. Good Luck


thanks, I actually recently (over a week or two) ran the lucas injector cleaner through. So I guess I should poney up the dough for the wires/plugs. Just was living my the old "if it aint broke, don't fix it" oath

You need to look at the following:

Plugs
Cap & Rotor

I would at least swap in a new cap and rotor if it hasn't been done.

thanks, I actually recently (over a week or two) ran the lucas injector cleaner through. So I guess I should poney up the dough for the wires/plugs. Just was living my the old "if it aint broke, don't fix it" oath


I thought you didnt have a cap and rotor if it was fuel injected?

It has one, you should replace it.

It has one, you should replace it.


is that normal for fuel injected vehicles?

Some, fuel injection NEVER means you automatically don't have a cap and rotor.

Never assume that.

Some, fuel injection NEVER means you automatically don't have a cap and rotor.

Never assume that.


Blazer LT is correct. It does indeed have a cap and rotor . Note: you will need two different size torx drivers two remove the cap and rotor ,wires have numbers on them so does the cap which makes it nice.

i just changed my CPI and Nut kit. tune up with plugs,wires,cap,rotor. i still get 12-13 MPG. grant you its cold but i think it should be doing better then that. and air filters clean and 2.5" cat back so theres plenty of flow. any reason on why still bad gas mileage? and the CPI or nut kit arent leaking.

i just changed my CPI and Nut kit. tune up with plugs,wires,cap,rotor. i still get 12-13 MPG. grant you its cold but i think it should be doing better then that. and air filters clean and 2.5" cat back so theres plenty of flow. any reason on why still bad gas mileage? and the CPI or nut kit arent leaking.


4 02 sensors.....................be prepared to pay $200 at the least for just the parts to do it yourself. I think we'd have trouble codes if they were bad though. How's your tire pressure?

O2 sensors might have 3,000 miles on them. tire PSI is to what the tire says. any ideas?

How are you calculating the fuel economy?

Also, is this stop and go city driving?

i drive 3-4 miles each way to work. average speed is 45-55. 45 going and 55 coming home. almost no stop and go traffic. i got the numbers by filling the tank. driving 40 miles and then refilling the tank and taking down the number of gallons and deviding it into the miles driven.

Well, with short trip driving like that, the engine really doesn't get a change to completely warm up.

I would do an economy measurement next time you go on a long road trip instead of the short trips.

12-13mpg is actually pretty normal with the short trips taken into account

when i get to work and engines completly warmed up and oil pressure is at the norm for highway driving and then idel. also i found some recalls for my truck but i called GM and they said there are none. is this true? the vin# is 1gkct18wxsk539322

Your engine is not completely up to temperature after 3 miles.

Trust me on this.

but the engine temp is up and oil is hot. what more would tell you its not fully warmed up? also any info on the recalls?

It is still running in open loop for probably most of those miles and is just going into closed loop when you park it.