Fox Xtremely high fuel consumption
- Thread starter PonyGTrider
- Start date
As long as the cam lobes are on their base circles when at TDC you are good to go.
DadLife0724
Active Member
I will say that I had an engine with 6 cylinders at 145 +- psi and 1 at 120 and 1 at 90psi and got 12-14 mpg while beating the bearings out of it, Has the ECU been checked out?
Yeah general is right, bad rings or valves burn oil and rob horsepower but his sub par fuel mileage is something else.
Just don't know what...
Just don't know what...
Wideband O2 gauge. Some way to datalog the computer. This will absolutely shed light on what's happening.
$500-600 is probably more than you need to make it happen. $200 for a WBO2. Like 250-300 for a quarterhorse. Then, IIRC, tunerstudio is free, or you can buy Binary Editor, if that's your choice.
Or, you can tear things down and hope to find something.
$500-600 is probably more than you need to make it happen. $200 for a WBO2. Like 250-300 for a quarterhorse. Then, IIRC, tunerstudio is free, or you can buy Binary Editor, if that's your choice.
Or, you can tear things down and hope to find something.
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That mpg for a six cylinders is awful.
I have two known good computers and makes no difference
It is bad but is not the worst case scenario. It doesn’t burn oil and basically blow by is non existing, those bottom rings are holding up very good but yeah that high fuel consumption is blowing my brain!
Mindseye007
5 Year Member
I'll say it's running to rich my 91 5.0 coupe did the same thing it was running to rich ? What do the tail pipes look like inside black ? what is the timing at ? and have you checked the capacitors on the ecu make sure it's ok and it might be starving for more air need to get a bigger MAF does the throttle body have a matching EGR ? should be a 70mm TB with that intake, what air filter are you using?
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Mindseye007
5 Year Member
Knock,knock,knocking on heavens door.
Maybe his balancer has moved and his timing is off.
The plugs don’t really show much of a rich contusión and the tail pipes are clean, driver side you drag your finger inside and it gives you a really faint light stain. The passenger side you drag your finger inside and it gives there is nothing not even a light stain. They’re clean!
As far as timing I have it at 14 degrees. I tries 10, 12, 14, and 16 degrees and no pinging at all, but also no improvement on fuel economy.
Tomorrow I’m installing a new set of plugs calibrated at 0.054” and see what happens
Not at all! Smooth like silk and no damper spinning, actually it is brand new, and after I verified TDC with a piston positive stop it is exactly at 0 degrees on the damper (TDC)
Mindseye007
5 Year Member
It seems I scan that darn computer every other day NO CODES . Ran all three tests KOEO, KOER, and Cylinder Balance Test and there are no errors.
Just to clarify you are getting an 11 then a 10 and then an 11, correct?
That’s correct.
Every time I’m asked if I get any codes my answer is consistently the same “I didn’t get any Error Codes” and as far as my concern codes 11 - 10 - 11 are not errors that’s why I never mention them.
In this same tenor I have an A9L and an A9P computers they both run perfectly fine with my T5 transmission and if I get a little picky I would say that the A9P has better acceleration or it is simply my perception.
On both of these computers I replaced the three known bad capacitor and they render the same results on the three scanning modes
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