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

[RobBeck]

I was going to post a question about interfacing a fuel pressure sending unit with the aux input of the Maft Pro but sounds like you got bigger problems right now....

[cbatters]

Originally Posted by |4x4 NV|

maybe a related problem that i need help with too.. my car idles really bad when cold (dies if i dont touch the throttle, but if i hold the throtle steady at about 5% the revs bounce from 400 to 2000 back and forth..) (afterstart comp is set to 10)

i have also been having a problem that is off and on and is REALLY pissing me off.

when i cruise down the interstate and try to keep it at a steady speed, you can feel the car jerk around really hard between accelerating and engine breaking and the AFR's jump from 14ish to 30+ at that exact point. it makes it very hard to cruise around. the wierd thing about it is that if i let off the throttle at a rapid speed, you cant feel it, but the second you try to slowly slow down, or even stay at a steady speed, the car acts like its jumping from 10% throttle to 0% throttle instantly.

Try adjusting TPS switch as per procedure in te service manual. SOunds like the ECU thinks you are decelerating and is cutting fuel (ergo high AF)



Clint

[TurboBob]

Originally Posted by |4x4 NV|

maybe a related problem that i need help with too.. my car idles really bad when cold (dies if i dont touch the throttle, but if i hold the throtle steady at about 5% the revs bounce from 400 to 2000 back and forth..) (afterstart comp is set to 10)

What are your trims doing, it sounds like your idle is lean. add some fuel in the low load range at 400, 800 and 1200 RPM, try 5% to start.

Bob

[TurboBob]

Originally Posted by DriveFast99

ok help... my car just randomly started to be gay. it will revv up and down like theres something amater with it, but when i disconnect the map sensor car idles fine. I dont understand this cuz it was driving fine in the am, then i go to go to class at 4 and bam. idles funky, so when i got home i unplugged the maf where the map and iat plug into, and it idles fine. some one help.

drop me a PM or email and we can go thru the troubleshooting checklist.

Bob

[DriveFast99]

bob clear ur pms. bu;t here is my reply to what you replied to me.

im runnign 680cc injectors. i think the mainscale is -42% or so. the weird thing is this happened randomly. went to school in the am. the went to go to work and the car idled between 400-1800rpms.

[TurboBob]

pms cleared.

got a datalog I can look at?

a big vaccuum leak can cause this, the engine will rev up, and the ECU will cut fuel to control it......

Based on your injectors, the data you PM'd me looks ok.

Also, unplug your ISC to be sure that's not the problem....

Bob

[RobBeck]

Rustang have you got your Map pretty straight now? I am thinking I am gonna order this up in the morning, be nice to just start with your map. You running stock fuel pressure with your Evo injectors?

[DriveFast99]

ok i need to register my tunerproRT software, and bob said its free for us who preordered, so how do i register without paying. i need a code or sumthing?

[TurboBob]

The info is posted here:

http://www.fullthrottletech.com/showthread.php?t=1361

[RobBeck]

Ok. I ended up ordering one from another member..... hopefully I have it by this weekend. Gonna do the AFC mode first, then graduate into speed density. Cant wait to get my injectors in, and pump the boost up 10psi or so.

Rob