My idea of a Shelby Ranger if there would have been one.

[multiranger]

you kinda made sense, but what a lot of people don't realize, what the cylinders can hold is quite often more than what the intake system can provide... i know the stop MAF on an 89 mustang is significantly smaller than what it should have to let the motor breathe properly... something like 55mm, i put a 73mm on mine, got an increase in power, and was still starving it slightly... (throttle body is about 73mm on a 5.0, so bigger than a 73mm maf doesn't make that much difference at that stage)

edit: is your maf dirty?


3 more to go!

Maf is clean.. I cleaned it with CRC MAF cleaner... I was refering to pulling as power to the rear wheels not air in the intake incase I caused confusion... It still runs just as strong as before...

 

[Robert_1967]

Hows the Fuel mileage so far?? does it seem like it is getting better???

I checked my BII today and I got 20.6 today when I filled it back up.




Robert

 

[--weezl--]

i was talking about danger's reply

 

[dangerranger83]

I was just going under that on a fuel injection that when the gas pedal is pushed this tells the computer to open the injectors more to allow more fuel but air restriction or lack of can greatly effect fuel mileage and may not alloow for proper velocity and and the fuel and air may not be mixing correctly.

Basiclly like putting ro big of a carb on an engine, it wont do to well.

 

[--weezl--]

i didn't understand the first half of what you said, but the second half, you're way off base there...

the main reason a big carburetor doesn't work with a small motor, is because the venturi effect of the air rushing through the carb doesn't happen, if there isn't that restriction... the car HAS to restrict airflow for it to work... because FI is all computer controlled, that gas gets delivered regardless...

if the theory of the massively oversized TB were true, then diesel motors wouldn't work...

IF the larger throttle body was causing this, it would most likely be due to a faulty IAC, TPS, or other piece of electronics, that is not correctly calculating the amount of air, which would result in an unmetered air type effect (similar to a vac leak)

ie: throttle body is bigger, so 1/4 throttle lets in 5% more air than the computer would expect, this in turn causes the truck to run lean, the o2 sensors pick this up, try to compensate, this confuses the ecm, MAF reads something different, and it all results in messed up settings... which kind of explains how the mileage slowly drops after resetting the computer... adaptive drive memory or what ever it's called

 

[Robert_1967]

Robert

 

[alwaysFlOoReD]

Multi, what post # is the start of your gas mileage thread with-in a thread? Or could you recap the high points?

Richard

 

[oldschool1955]

IF the larger throttle body was causing this, it would most likely be due to a faulty IAC, TPS, or other piece of electronics, that is not correctly calculating the amount of air, which would result in an unmetered air type effect (similar to a vac leak)

ie: throttle body is bigger, so 1/4 throttle lets in 5% more air than the computer would expect, this in turn causes the truck to run lean, the o2 sensors pick this up, try to compensate, this confuses the ecm, MAF reads something different, and it all results in messed up settings... which kind of explains how the mileage slowly drops after resetting the computer... adaptive drive memory or what ever it's callled



Weezl you are very good on ecm knowledge.
Every thing you said here is correct, but to fix a problem like this it is a multi step trial and error 80% of the time. The maf tells the computer the volume of air entering the manifold pre tps. It can be any of the air/fuel sensors that are telling the computer that it needs to up the fuel trim. All multi is doing right now is locating the bad signal. So it works best to start at the simple first. Thats why I suggested swapping out the maf to try to get the computer back in proper fuel trim. If I lived closer I would bring my lap top down run it through my little back door software and reset a few sensors and we would have a 45 mile per gallon ranger. I played with my 1998 dodge 1500 and had it getting 28 mpg with a 360. That not being possible right now I will see what we can do to correct through here. As always keep up the great work multi.

 

[Robert_1967]

oldschool1955

Is there a special cable you have to buy to hook to the ECM and USB, or can one be made from a regular USB cable ???



Robert

 

[oldschool1955]

oldschool1955

Is there a special cable you have to buy to hook to the ECM and USB, or can one be made from a regular USB cable ???



Robert

I got my software from a friend that designs programs for microsoft. won't say how he got his info on the backdoor codes for the big three and toyota. my cords I got when I bought a software called nology. Didn't like nology thats why my friend made me a new program. He wanted to sell it publicly but there are things in it that car manufactures don't want the public to be able to do. You can always buy a bullydog programmer if you have a spare kidney to sell.

http://http://www.nology.com/laptopdyno.html

 

[dangerranger83]

The link leads us to nowhere.

I would like to have software that tells me what a vehicle is doing by just plugging it into my laptop.

 

[Robert_1967]

copy and paste and delete one of the http:// and it works, only problem for me is that they only do obII and not I, I need something for I so I can do "stuff" to my 88 Ranger, and my 89 BII


Robert

 

[oldschool1955]

robert check this site.http://www.tunercat.com/

 

[multiranger]

Multi, what post # is the start of your gas mileage thread with-in a thread? Or could you recap the high points?

Richard

It seems like it all started after installing a new thermostat.. Since then I have put another new one in... So far here is what I have replaced.

VSS, TPS, Screamin Demon Coil Pack, 6 new injectors, plugs, wires, Charcoal canister, purge valve, 02, AC pressure switch, thermostat 195 Dergree, Fuel pump, Fuel Filter, and Fuel pressure regulator.. I think that is everything.. Oh and a 8.8 3.08 rear axle from a 7.5 3.45.. and a new used Air charge temp sensor..

Now I think that is everything...

 

[multiranger]

I may have figured it out... I installed the BBK back on her Sunday. This time I used the factory 8mm bolts instead of the allen head bolts. I also put a little of the K&N filter oil on my finger and lubed up the rubber ring on the intake tube where it fits arount the TB.. after studying the inside of the TB it looks like it may have had some leaks around the gasket and the bottom of the intake tube.. Remember the BBK is bigger so it is hard to get the tube on it and it never really looked like it was all the way on even after several attempts in making it go further. I assumed it was on far enough... Well after lubing it up it slid on all the way. Also with the factory bolts I was able to tighten the TB down more... I haven't filled her back up yet but the fuel gauge seems to be staying put after driving it several miles over the last three days.. I'm not getting my hopes up though.. My dad seems to think it may be the new gas blend causing sucky MPGs.. I don't think that is it cause my 97 Civic gets 40 + MPG and always has over the last 6 years I have owned it..