swapped in a mini me... 20mpg!
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swapped in a mini me... 20mpg!
Ok 2 weeks ago i swapped in a minime (b7 block z6 head) into my 93 DX hatch.
At first the ecu i had was fryed so i got another P28 and cleared the codes. when i bought the motor it was a tooth out of time and i didnt catch it till i drove it. (done many swaps and also know what a tooth off feels like) So i fixed this thinking it was my problem with the gas milage but afterwards it is the same. I dont know what else it could be? Seems to be running ok, there are no fuel leaks anywhere. Any guesses guys? i mean 200 miles a tank? cmon... Let me add it was getting over 30 mpg with the old dx motor so im thinking the longblock somewhere contains the problem
At first the ecu i had was fryed so i got another P28 and cleared the codes. when i bought the motor it was a tooth out of time and i didnt catch it till i drove it. (done many swaps and also know what a tooth off feels like) So i fixed this thinking it was my problem with the gas milage but afterwards it is the same. I dont know what else it could be? Seems to be running ok, there are no fuel leaks anywhere. Any guesses guys? i mean 200 miles a tank? cmon... Let me add it was getting over 30 mpg with the old dx motor so im thinking the longblock somewhere contains the problem
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yeah if you stand behind your car and your eyes water then its deff running rich...i know this because i have a 94 rx7 and i get 9 miles to a gallon and i idle at 11.2:1 but this is normal for my car because its a rotary engine...
what size injectors do you have and whats the fuel pressure?
what size injectors do you have and whats the fuel pressure?
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So tonight i replaced my spark plugs and my old ones were black. Obviously i am running rich, what could be causing this? I am on a stock p28 and oem fuel system.
Just want it to lean out without having to tune it. obviously something is causing it to run this way, i also replaced my o2 and it wasnt the problem...
Just want it to lean out without having to tune it. obviously something is causing it to run this way, i also replaced my o2 and it wasnt the problem...
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Its kind of a longshot, but take a peek at the inside of the cat. If they get too hot, they will melt, and cause major blockage.
Otherwise I would guess its an O2 issue more than anything. If it went bad (or the signal wire was touching another) and reported a voltage for richer conditions, the ecu will run it rich thinking its stoimetric.
Otherwise I would guess its an O2 issue more than anything. If it went bad (or the signal wire was touching another) and reported a voltage for richer conditions, the ecu will run it rich thinking its stoimetric.
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I am using the map on the intake manifold from the z6 head. I swapped map sensors to see if that was the problem and it wasn't, again i have no cells and car seems to be running decent except for the 20mpg. What else can i check that could be causing this? Could an injector be stuck open? and if so how do i check with a meter? Im so stumped on this 20 mmpg thing, i mean it shouldnt be hard to find its losing 15mpg!
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Someone told me to check the coolant sensor even though im getting a temp reading on the cluster the ecu could still think the motor is cold and dump extra fuel while im driving. Anyone heard of this?
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Ya there is also a temperature sensor on the back of the intake I believe, I assume thats ok too?
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well, if your old map sensor was on your firewall and now your running the one on the throttle body then maybe you connected the wrong connector. which one did you use the connector on the dx/si harness or firewall mounted connecter?
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