Fuel Injector Questions

[XTC90BII]

I am at 112,xxx miles now and have no history of the fuel injectors every being replaced on my 1990 BII. I have used several bottles of injector cleaner since July 2015 when I bought the BII with 103,xxx miles on it. I have noticed in the last several months the MPG seems to have gone down. The BII run great I believe. What are the chances of needing to have the fuel injectors replaced?

A: Do you think this would improve the MPG?

B: How hard of a project is this?

C: What is the labor time on this project?

Dennis

 

[JerryC]

How bad is your mpg and what is you avg drive like?
I notice a drop in MPG in the cold. My last fill up I got 16.1 mpg. My average drive is usually a 10 - 20 mile cruise through some county roads with some short runs to the store mixed in. I've got 4.10 gears and P235 all terrain tires.

 

[XTC90BII]

Jerry C

Most of my drives are in the 10-20 mile roundtrip range. I run 45-55 MPH most of the time on my drives into town which is 10 miles one-way. I think this last tank I got around 16.02 and I am usually get about 300 miles on 18 gal or so. I have a 3:73 LS gears and I am running 235/75/15's Goodyear Wrangler RT/S's right now because that is what was on the BII when I bought it. This summer I am going back to the 205/75/15's Firestones Destination AT's that it came with originally from the factory.

Dennis

 

[JerryC]

They were rated 16/20 when new. Factor in ethanol in the gas, bigger tires and cold weather and I think we're both doing fine.

 

[XTC90BII]

Jerry C

Do you think going back to the 205/75/15's will improve the MPG some? At least going back to the 205's should cut back on the road noise and bring the speedo back into line.

Dennis

 

[JerryC]

Based on experience I would say yes, but I don't know how much.
The smaller tires will raise your rpm/mile hurting mpg, but they should be lighter with a smaller contact patch (less rolling resistance) helping your mpg.
It will accelerate better meaning less throttle needed from stops.
Steering and braking effort should be less as well.

 

[IIBRONCOS]

I am at 112,xxx miles now and have no history of the fuel injectors every being replaced on my 1990 BII. I have used several bottles of injector cleaner since July 2015 when I bought the BII with 103,xxx miles on it. I have noticed in the last several months the MPG seems to have gone down. The BII run great I believe. What are the chances of needing to have the fuel injectors replaced?

A: Do you think this would improve the MPG?

B: How hard of a project is this?

C: What is the labor time on this project?

Dennis

On my 1988 Bronco 2.9 I rebuilt the original fuel injectors. They are fairly simple to rebuild, and the kit was only $20.00 for all 6.
I made up a way to pressure the injector with lacquer thinner, and a 9 volt battery to activate the coil to spray the lacquer thinner through to clean. You will also need a #8 screw and a bench vise to pull out the micro filter out of each injector. There are a couple of You Tube videos that show how to rebuild fuel injectors. I didn't keep track of the time it took.

 

[XTC90BII]

IIBroncos

Thanks

I think if I go this way I will just replace them. More in my skill level.

Dennis