---===The Official MAFT-Pro Thread===---

[3000GT MR]

Originally Posted by flyman1981

ok... i have to post because i cant figure this thing out and its really frustrating.

I cannot get rid of my idle bouncing (~800 rpms). I've messed with just about everything including the biss screw. I'm runnning the newest Pro update (5.03). I've had my mainscale up from -38% to -64%, plugged and unplugged stock O2's for a couple days, PT tracking on and off, and more.

rarely it will idle without bouncing for a few seconds but then start bouncing again.
Mods:
720cc's @ 40psi
stock cams, ported heads, 14B's, dual feed fuel... (read sig)

Any ideas?

mines doing the same thing. i have to reset my ecu every 6 days or so because it gets really bad. the biss screw helped a little. did you fix the problem?

[TurboBob]

Originally Posted by 3000GT MR

alright new problem now. i updated to v5.03 and started from scratch on my tune. it runs well now. well ofr the short time i've driven it. my problem is im hitting fuel cut off at about 5500rpm. my IDCs are at the highest 83% my airflow is no higher than 1200Hz. does this sound like a ecu or maft problem thanks.

Chris

at 83% DC you should not hit fuel cut.

Can you post a log?

Does it do it hot and cold, just cold,.....fill us in.

Bob

[Rogue_Ant]

Originally Posted by 3000GT MR

mines doing the same thing. i have to reset my ecu every 6 days or so because it gets really bad. the biss screw helped a little. did you fix the problem?

When your idle starts to go bad, what does your low-trim say?


-Rogue

[3000GT MR]

Originally Posted by TurboBob

at 83% DC you should not hit fuel cut.

Can you post a log?

Does it do it hot and cold, just cold,.....fill us in.

Bob

i cant post logs because my computers broken and i have to borrow this 1 to go online. when i get mine back i will. my logger missed fuel cut off it went from 5700 to 5969rpm and fuel cut off was around 5800 and thats when i let off the gas. As you can see my throttle was still shutting at 5969 hence the 14%tps ...but at 1 given moment according to my logger:
at 94%tps 5200rpm im at 1283hz 89%idc 37*adv. .98V at 100%O2 trim.
at 94%tps 5719rpm im at 1289hz 87%idc 38*adv. .98V at 100%O2 trim
at14%tps 5969rpm im at 1164hz 14%idc 40*adv. .96V at 102% O2 trim.

i richened it up a bit for this log to see if i could hit fuel cut off earlier but nothing changed. i've only done it when its hot. i dont like flooring my car when its cold. my car sounds like as if i was giving it gas and turning the key off at the same time. Thats all i can think of

Originally Posted by Rogue_Ant

When your idle starts to go bad, what does your low-trim say?

-Rogue

after a while they all read High-72 med-72 low-73 my O2 trim at idle goes from 50ish to 150ish at any giving time. At 1 red light it will be between 123-150 and the next light it will be 50-80. always fluctuating. i've seen it as low as 43.. accoring to my wideband its been as lean as 19.5 and as rich as 10. my car is best at cruise. it runs great. stays right around 15.1-15.5 depending on rpm. it accelerates pretty good and smooth.


thanks for your help guys!
-Chris

[Rogue_Ant]

With your trims that low, I would take away ~5% to the mainscale and drive around a little bit to get them more in line.

You have a PM.


-Rogue

[mightymoose]

I have a good one: 92 VR4 in SD mode, everything is wired up according to the diagram, double checked, checked again. Car actually runs great, here is my complaint. whenever the cooling fan or AC is on, the LC-1 bascially shows no reading or t he LED indicator just blinks continuously. I was thinking there was a grounding issue. but can't seem to find anything out of place. I've been driving with no AC--already to hot to not be using one. Still isn't safe though when the cooling fan kicks in.

Any suggestions as to what to look for, etc?


thanks
James G

[Rogue_Ant]

Where are you grounding and getting power for the LC-1?


-Rogue

[3000GT MR]

Originally Posted by Rogue_Ant

Where are you grounding and getting power for the LC-1?


-Rogue

I sent you an E-mail with the requested data.

BTW does anyone know what settings the 2 blue reostats to the right of the display inside are supposto be set at or if someone happens to take theres apart could you take a picture. Long story short i think i might have turned one when i had it apart when i was making a holder for it.

Chris

[mightymoose]

The power source is coming from the ECU, The ground is isolated to the frame,, where is the suggested power and grounding points? thanks
James G

[TurboBob]

Originally Posted by 3000GT MR

I sent you an E-mail with the requested data.

BTW does anyone know what settings the 2 blue reostats to the right of the display inside are supposto be set at or if someone happens to take theres apart could you take a picture. Long story short i think i might have turned one when i had it apart when i was making a holder for it.

Chris

one sets the 5 volts, as measured on the regulator metal tab.

the other sets a 2.5 volt reference for the V-Outs, as measured at the test point next to the trimmer.