I have an 85 pickup with a rebuilt 22RE with about 3,000 miles on it. I am only getting 17 mpg and that is mostly flat highway miles. It started at 14 and is slowly climbing and peaking at 17 it seems. It is bored over 30 with an RV2 cam, auto trans, 30x9.50 tires, new O2 sensor and I drive it pretty easy. I was really hoping to be in the low 20's as I have heard is possible with these motors. It runs great with only some very slight rough cold starts and very slight roughness at stop lights. I am guessing the fuel system and injectors need a good cleaning so I just put some Redline in it last night. Any other suggestions for a little better mpg and a slight gain in power?

Thanks.

 

Honestly only effective gain you can expect is from dropping the auto trans and big tires. Mine is stock with 5 speed and ive upgraded to 16 in rims but a 60 series tire. It gets about 25. 27 when i run the a/c. That engine is going to be slow but its bulletproof

 

Also the over bore and aggressive cam are going to make the ecm compensate by adding fuel. Its a stretch but u could try looking into a reflash to make the engine run better so the ecm doesnt think something is wrong

 

So who reflashes Toyota 22RE ECUs?

 

Naturally the larger(More cc's or cubic inches) the engine is the more air/fuel it needs to run...

One of the biggest things that determines the air/fuel ratio on the 22re is the AFM(Air flow meter). The AFM acctaully believe it or not determines about 75-80% of the engines Air/fuel ratio....

They are a high wearing part however the seldom go completely bad but they wear just like an engine does... In a mater of speaking...

I suggest you get the Air flow meter Rebuilt/replaced and that may help alot.

What is your timing and idle at? I would suggest these be at:
-750rpms-950rpms
-5 Degrees ATDC

The fact that its a 4wd straight axle pick-up will make it hard to accomplish a great gain in MPGs.... 17mpg is pretty normal 22re Mileage esp. on your set up....

Losing the tires would have alot

Put 40psi in all your tires... that will help some...

No exhaust leaks? Correct O2 sensor? Hope its not a bosch one... if so i bet its not even working... get a denso one tis the best and OEM for these trucks..

Correct spark plugs? NKG platinum or better for these trucks.

Vacuum leaks?

Dragging brakes?

 

Never heard of AFM wearing out. You mean the trap door wears out. Who rebuilds these things.

 

Not just a door... been i while since i've seen one apart but its a large mechanical sensor with spring(s) and resistance devices... and the spring(s) and the door open and close many many times durings engine cycles....

 

How would you rebuild it??

 

You can rebuild them, but it requires special tools and electronics. Companies do remanufacture them though.

 

Idle is set at about 800 and about 7-8 deg advanced, no exhaust leaks (2" Mangnaflow), I have a new Denso O2 sensor, new NGK plugs, I don't believe I have any vacuum leaks but I could replace them...brakes were checked out a couple months ago and were good.

I am on my second tank of fuel since the Redline fuel injector cleaner so I will check my mpg to get an average and will post the results in the next week or two. I have been running it at a lower elevation for about 3 weeks now and it has been running with a noticeable increase in power. I know that you generally get more power at lower elevation so that probably helps but I would credit the Redline with some assistance in the power as well because I noticed a small increase at higher elevation where I normally ran it. How many miles does it take to completely break these in and get peak HP and torque?

 

I would say after about 500-1000 miles you will prob notice a little bit of a difference in engine operation as the engine starts to break in and relax stress points and the computer picks back up after a while of sitting and being introduced to this "new enigne"

 

On my trip over the mountain I averaged 19.5 MPG with a small load in the back of the truck. There were some decent grades to pull but that was almost all highway miles at 19.5. I then drove it mostly back and forth to work a short distance in town on a tank and averaged 16. My MPG has slightly went up and I will continue to use a fuel injector cleaner every once in a while and would recommend the Redline. I do still need to double check all my vacuum lines though. Thanks for the input everyone!