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09-18-2006, 02:42 AM
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#1531 (permalink) |
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Twin Turbo Devil
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Re: ---===The Official MAFT-Pro Thread===---
(THIS IS QUICK VR4)
TurboBob I need your help ASAP. My car runs pig rich to the point where it wont idle. I traced it back to my map sensor reading 94 at key on (car off). Does this mean my map sensor is bad? the reading does change when I blow or suck through it. ive ran through the setup a million times and its setup properly. This randomly started happening at the same time my ECU caught on fire I guess. ECU's been replaced but problem still exists. maftpro wiring is perfect, circuit board looks good. Also my pw is in the upper 20's at idle, I guess because my airflow is 157hz. I'm stranded in las vegas 300 miles from home... help pleeeeeeease
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....1997 VR4.... "World's Fastest Red 97 VR4 with 575 Hood" 12.6@109 9/16/06 317awhp, 331awtq 8/19/06 2008 Smart Car Cabriolet - Cruiser 1992 Yamaha FZR600 - SOLD 1995 3000GT - SOLD www.turbojenna.com    |
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09-18-2006, 06:41 AM
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#1532 (permalink) |
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Resident mad scientist
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Re: ---===The Official MAFT-Pro Thread===---
94 with the engine off is ok.
Look at FO UT VE RPM TPS AFL What is your MP reading with the engine running? what version are you running? Bob
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Need a datalogger? Check out the Scanmaster 3
PM me about ECU mods for 8000+ RPM rev limits !!!!!!!! Stock = 7300 RPM Stage 1 = 8060 RPM Stage 2 = 8200 RPM Stage 3 = 8400 RPM Stage 4 = 8800 RPM (By request only)  1991 Stealth RT/TT, Grooms Shortblock, 13G's. My Stealth is for sale, 65000 miles, runs perfectly. $6,500 (a bargain)  Last edited by TurboBob : 09-18-2006 at 09:08 AM. |
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09-18-2006, 01:31 PM
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#1533 (permalink) |
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Twin Turbo Devil
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Re: ---===The Official MAFT-Pro Thread===---
well I cannot get the engine running. version 4.63. My cars pulswidth goes up the roof. The airflow signal is also at 157hz at idle which i believe is way too high. I am running 550 injectors and a correction of -40. I can't get those other values for you because the engine does not idle. Just dumps mad fuel.
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09-18-2006, 01:42 PM
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#1534 (permalink) |
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Resident mad scientist
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Re: ---===The Official MAFT-Pro Thread===---
unplug the harness from the MAP sensor. The airflow calculation in the Pro should go to almost 0.
If the hose on the MAP sensor is not connected to a proper vacuum source, then you will get this kind of thing. Bob |
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09-18-2006, 01:54 PM
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#1535 (permalink) | |
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Racing
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Re: ---===The Official MAFT-Pro Thread===---
Quote:
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09-18-2006, 02:01 PM
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#1536 (permalink) |
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Resident mad scientist
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Re: ---===The Official MAFT-Pro Thread===---
the injector opening and closing times have a large effect on the pulsewidths at part throttle and idle. This is most likely the reason.
Different mechanical technologies react very differently 680 = Delphi/Rochester 550 = Denso Bob |
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09-18-2006, 02:37 PM
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#1537 (permalink) |
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Wrenchmonkey #839
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Re: ---===The Official MAFT-Pro Thread===---
EDIT: This can't be the problem, but I'llleave my post anyways
 My autometer gauge has a map sensor that recalibrates every time the power is turned on, The normal ignition power turns off for a second when the starter is on. This made my autometer boost gauge calibrate while the engine was starting so it was wildly inaccurate. I rewired it to the ECU power supply and the problem went away. I am am not sure if the GM MAP sensor works the same way but it does look just like the Autometer gauge. I had a boost control problem that was driving me nuts, until I realized I wired it wrong.
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 For sale 3.5L 6g74 Swap modified oil pans and thermostat hosuings http://www.3si.org/forum/f4/fs-6g74-...ied-3s-420690/ Last edited by John Monnin : 09-18-2006 at 04:25 PM. |
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09-18-2006, 02:58 PM
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#1538 (permalink) |
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Resident mad scientist
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Re: ---===The Official MAFT-Pro Thread===---
The Pro and MAP sensor are powered by ECU power, and don't shut off during cranking.
The autometer recalibrates because its a stepper motor mechanism, and at power-up it doesn't know which way the needle is pointing. The Pro can be set to capture MAP at power-up to compensate its boost calculation, this doesn't affect the fueling calculations. The MAP sensor is an absolute sensor, and has no calibration requirement. If the vacuum feed to his sensor is bad, he will have this issue. B |
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09-18-2006, 03:30 PM
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#1539 (permalink) | |
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No loer a Noob?
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Re: ---===The Official MAFT-Pro Thread===---
I guess I was too slow
 . Good luck with that. It was a really good deal. sam we just bought the wife a comuter car (toyota corola - 41mpg highway )Its coming though - just might have to buy new Quote:
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92 Stealth R/T TT - 13t's Installed. note:Is the machining right? - boosting to 15psi so far.
Do I do this for others? No. robbeck is your man.... We know his work . |
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09-18-2006, 04:43 PM
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#1540 (permalink) |
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Wrenchmonkey #839
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Re: ---===The Official MAFT-Pro Thread===---
Did Boomslang give any idea when they were going to make a MAFT pro plug and play harness?
There generic jumper harness is only $99 so I was going to get that and just make all the connections myself, but It would be worth a little extra to have it plug and play, less likely for a bad connection too. I alos consider getting a SAFC or Emanage harness and just cutting the ends off and crimping on the MAFT pro connectors, the only thing I really gain is the nice colored wires and a few less crimps |
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LinkBacks (?)
LinkBack to this Thread: http://www.3si.org/forum/f103/official-maft-pro-thread-290438/
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| Posted By | For | Type | Date | |
| HOW TO INSTALL MAFTPRO ON A 91-99 3000GT VR4/91-96 STEALTH TT | This thread | Refback | 04-13-2008 01:45 AM | |
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