MAF conversion nets lower mileage!!!
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MAF conversion nets lower mileage!!!
ok, I updated my 95 5.8 4x4 to a 96 ecm.
Othe than having to make my own harness, I also had to buy 2 new o2 sensors and weld in bungs.
I also had to buy a special 1 yr make harmonic balancer with a tone ring on it. I also had to install a pickup for it as well as install a OBD-II port.
I was able to remove the smog pump as well as the lines that go to it, and I plugged the back of the heads. I did not install a rear (3rd) o2 sensor after the cats however, as I don't believe that has anything to do with mileage or performance, I think it just checks the effiency of the cats.
The one thing I did remove and need to re-install is the EGR valve. I need a new one and a DPFE sensor, but do not know how to install it. I just disabled it with a tweecer.
Now for the numbers
Stock w/ SD 14.5-15 mpg
Mass Air 11.2-12.3 mpg
Any ideas would be greatly appreciated.
Chris
Othe than having to make my own harness, I also had to buy 2 new o2 sensors and weld in bungs.
I also had to buy a special 1 yr make harmonic balancer with a tone ring on it. I also had to install a pickup for it as well as install a OBD-II port.
I was able to remove the smog pump as well as the lines that go to it, and I plugged the back of the heads. I did not install a rear (3rd) o2 sensor after the cats however, as I don't believe that has anything to do with mileage or performance, I think it just checks the effiency of the cats.
The one thing I did remove and need to re-install is the EGR valve. I need a new one and a DPFE sensor, but do not know how to install it. I just disabled it with a tweecer.
Now for the numbers
Stock w/ SD 14.5-15 mpg
Mass Air 11.2-12.3 mpg
Any ideas would be greatly appreciated.
Chris
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Joined: Jun 2006
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From: Ottawa, Ontario
That's not typical.. an improvement in milage is what I see reported most times.. though it's not always a hugh improvement. What about the EGR valve are you having trouble installing? The lack of EGR will definitely impact milage, and how exactly are you calculating the milage?
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calc mileage as full tank to full tank. Trip meter miles divided by gallons to fill.
but I mean I was always able to get over 220 miles out of the front tank and now I can't even get 170. It is rather pathetic.
The new 96 computer requires a DPFE, my old 95 computer had a smog pump and a bunch of solenoids and air lines. I have removed all of that. I need a diffirent egr valve as well as a dpfe sensor. I need to know how to route the vacuume lines and I need a new vacuume canister. Once I have all that info and parts I can re-enable the EGR sensor on the computer.
I would think that even without the egr valve my mileage wouldn't have dropped off that much. Especially now that it is MAF calibrated and sequentially injected as opposed to port.
I wonder if a 95 ecm would have yeilded better results.
I am also debating if I have trully disabled all the info that the computer is looking for on the rear o2.
I am not sure, but there are a ton of scalars about it.
I am also wondering if I can get a better program, like a superchips burn, and insert that with the tweecer for better mileage.
but I mean I was always able to get over 220 miles out of the front tank and now I can't even get 170. It is rather pathetic.
The new 96 computer requires a DPFE, my old 95 computer had a smog pump and a bunch of solenoids and air lines. I have removed all of that. I need a diffirent egr valve as well as a dpfe sensor. I need to know how to route the vacuume lines and I need a new vacuume canister. Once I have all that info and parts I can re-enable the EGR sensor on the computer.
I would think that even without the egr valve my mileage wouldn't have dropped off that much. Especially now that it is MAF calibrated and sequentially injected as opposed to port.
I wonder if a 95 ecm would have yeilded better results.
I am also debating if I have trully disabled all the info that the computer is looking for on the rear o2.
I am not sure, but there are a ton of scalars about it.
I am also wondering if I can get a better program, like a superchips burn, and insert that with the tweecer for better mileage.
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I for some readon am getting abour 16 around town on a tank, and about 14 on the highway....
I am still assuming that it is the fault of the EGR.
Can I use the old egr valve, with the EVP or do I have to have a diffirent one and install the DPFE?
Chris
I am still assuming that it is the fault of the EGR.
Can I use the old egr valve, with the EVP or do I have to have a diffirent one and install the DPFE?
Chris
Posting Guru
Joined: Mar 2003
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From: Cloud USA
EGR is likely your problem because it reduces pumping losses at highway speeds. My Dad has a 96 Bronco with 5.8 and sucks gas like a banshee. He is lucky to get 14mpg with a tail wind. These computers might not be the best route for performance and mileage because of the OBD2 system.
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From: Central,Texas
able to get over 220 miles out of the front tank ?
Is that hwy miles or city?
I never got more then 188 miles mixed on the first tank ALSO i dont let the tank get to empty before the next fill up i wait till the quatrer.
Yea you might want to install that EGR Valve.
Is that hwy miles or city?
I never got more then 188 miles mixed on the first tank ALSO i dont let the tank get to empty before the next fill up i wait till the quatrer.
Yea you might want to install that EGR Valve.
Postmaster
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From: Central PA
Not normal course most woulkd have went with the obd! set up. Somethings off . We average 2-3 MPG increase on the 302 covnversions . And have had 351's running 302 MAf ecu still have MPG improvment.
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more like 160 out of the front tank. I used to get 200+ when it was SD. I wanted to go to a 95 maf computer, but finding one for a 5.8 w/ E40d 4x4 just wasn't happening. Watched ebay for over a year.
I wonder if I can just use the old egr valve and the position sensor and just tell the ecu that is what it has. I mean I know how to with the tweecer, I just wonder if it will work correctly since there is no more thermactor junk on it.
Also, it smells like it is running rich, so something must be up. I cannot even spin my tires anymore either, so I am assuming very lame program in the computer. Might buy a programmer, just to see what I can do.
Chris
I wonder if I can just use the old egr valve and the position sensor and just tell the ecu that is what it has. I mean I know how to with the tweecer, I just wonder if it will work correctly since there is no more thermactor junk on it.
Also, it smells like it is running rich, so something must be up. I cannot even spin my tires anymore either, so I am assuming very lame program in the computer. Might buy a programmer, just to see what I can do.
Chris
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more like 160 out of the front tank. I used to get 200+ when it was SD. I wanted to go to a 95 maf computer, but finding one for a 5.8 w/ E40d 4x4 just wasn't happening. Watched ebay for over a year.
I wonder if I can just use the old egr valve and the position sensor and just tell the ecu that is what it has. I mean I know how to with the tweecer, I just wonder if it will work correctly since there is no more thermactor junk on it.
Also, it smells like it is running rich, so something must be up. I cannot even spin my tires anymore either, so I am assuming very lame program in the computer. Might buy a programmer, just to see what I can do.
Chris
I wonder if I can just use the old egr valve and the position sensor and just tell the ecu that is what it has. I mean I know how to with the tweecer, I just wonder if it will work correctly since there is no more thermactor junk on it.
Also, it smells like it is running rich, so something must be up. I cannot even spin my tires anymore either, so I am assuming very lame program in the computer. Might buy a programmer, just to see what I can do.
Chris
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Well, I got the egr hooked back up, no signs of improvement yet
Do you think a 95 EEC-4 computer would be a better choice?
I only went with the 96 for the obd-2 port and the tweecer datalogging feature.
Chris
Do you think a 95 EEC-4 computer would be a better choice?
I only went with the 96 for the obd-2 port and the tweecer datalogging feature.
Chris
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From: Long Beach, Calimexiforia
Normal chain of events is EGR gradually loads up internally & becomes less and less able to adiquitly respond to demands from the Pciency reduces And residue and carbon deposits increaseingly build on the surfaces of the combustion chambers.good news:as deposits increase and cylinder volume reduces this increases the rate of compression. Bad news: your 302 is only displaceing 289 c.i. at the moment. Residual fuel reminants are exausted where they collect on and around the O2 sens. causing it to respond less accuratly & at a reduced switch rate. and as a parting gift, clogs & poisons your Cat. 2 cans of SeaFoam. 2/3 can thru air intake 1/3 in tank, repeat again a week later. If EGR now ok, then replace O2 sens. w/hi switch rate unit, you can expect at least a noticable improvement until replaced by removeing & doucheing probe P/U head w/ electronic contact cleaner & reinstalling. Useing other than 87 octane will only contribute in makeing it worse and faster. Problem w/ EGR is by the time flow reduces flow to the point of throughinga error code, negetive effects are well established.
