7MGE Better Fuel Economy

[cambelt]

No its a black toothed wheel inside it , you just use a razorblade around the top and then pry the cover off .
Dave

[rvrolla]

Cheers mate, thats what i was referring to

[brett_celicacoupe]

, i have serviced many that do it and when you back the timing off they have no power when cold,,
Dave

so this lack of power is hereditory in the series 2 MX83's?

i have a mate who has one and says he can hardly move until the car has been idleing for 10mins

car to share the solution to the problem (if any). do you know what causes it?

[EldarO]

Try removing the air flow meter cover and richening it up a bit , loosen the screw and let it move 5 or 6 notches(the black disk wheel ) , make sure you mark the original position first tho .
Dave

i know 7MGTE's use a karmann vortex AFM, im not sure about the 7MGE, but unless it uses a flap type (1G stylez) then this isnt applicable...

right...?

please help me understanding thingys with the thinkingness... :/

Elda.rO.

[mrshin]

7MGE's use a flap..

[EldarO]

cheers for the info

new knowledge FTW!

Eldar.O.

[rvrolla]

so this lack of power is hereditory in the series 2 MX83's?

i have a mate who has one and says he can hardly move until the car has been idleing for 10mins

car to share the solution to the problem (if any). do you know what causes it?

Adjust timing to 10deg and you have a cold 7MGE burnout machine! Mine was an absolute pig when cold, one day decided to check the timing, it was at 4deg (set by mech ), adjusted to 10 and voila!

I have tried the AFM, I cannot find the said crew?
Click for larger image

[amichie]

you say open the AFM cover, do you mean the black plastic on top that seems to be sealed?

I have one with the cover already removed. You can try it out if you like to avoid butchering your own.

My MX83 had these exact same symptoms. No power when cold.
I fixed it by repacing the fuel pressure regulator with an adjustable one and I reduced the pressure. Too much fuel pressure when cold causes the car to run very rich. When rich, the flame speed is very slow and so it will only have power if you advance the timing. However as soon as it starts running off the O2 sensor it comes back to a normal mixture and then starts pinging.

Just curious.
Do you also have a hot start problem?? Hard to start when hot and been sitting for about 20 minutes.

[rvrolla]

Interesting with the FPR, does it actually run any more efficiently with it? I never have hot start problems at all, the only thing I need to do is run a relay to the starter motor as it is not getting enough juice sometimes.

I found that if I back my timing off, it is a pig when cold and seems to ping worse under little load..

[amichie]

My car has run much better since changing the FPR, no more giant plumes of white smoke at full throttle and no clouds of white misty smoke after those early morning cold starts.

More recently I replaced most of the exhaust system. car now runs really well. It's hard to say for sure if I have seen much improvement in fuel economy although drivability is now greatly improved and I have seem to be enjoying the extra zing by putting my foot down a little more often. The 7mge loves to rev now and its sounds great.

[rvrolla]

Whats involved in changing FPR? How do you know what to set it to?

Can anybody see anything bad with this? I know the 7M's run super rich in standard trim, my fear is we change the fuel pressure and I'll start detonating... BHG

[amichie]

Whats involved in changing FPR? How do you know what to set it to?

Can anybody see anything bad with this? I know the 7M's run super rich in standard trim, my fear is we change the fuel pressure and I'll start detonating... BHG

You can find some more pics of what I did here.

http://www.thermactor.com/forum/viewtopic.php?t=10624

[cambelt]

Its the metal toothed wheel in there and its one of the philips head screws you undo. i think on your one you can hold the claw that locks the toothed wheel and turn it without loosening any screws, just mark the old position of it first.
Dave

[amichie]

Whats involved in changing FPR? How do you know what to set it to?

I gradually reduced mine from about 44psi with the toyota FPR to about 32 psi with the adjustable one. I set it by periodically checking the fuel trim at the diagnostic connector until it gave an average value of 2.5Volts. Which according to the manual means little or no fuel trim is being done.

It started off at zero and slowly moved up through 1.25V to 2.5V. Now Iv'e stopped fiddling with it and its settled down nicely.

[IMG][/IMG]

BTW the FPR has a little vacuum line on it to increase the fuel pressure during high load.

[Cressida91GLX]

Just curious.
Do you also have a hot start problem?? Hard to start when hot and been sitting for about 20 minutes.



This problem was fixed for me by changing the battery with a good one.