7 BOUND

HEY guys can you help me out, all im trying to do is find out what the map sensor does, and if it goes bad, how would i know its bad. My symptoms are, high idle around 1400 rpm's, when i down shift and slow down the idle hunts then when i take my foot off the clutch it stops hunting. I have searched and done the idle screw thing. I have a PFC, when i try to add the base mod map all i get is alot or black smoke and POP POP POp, my ? again is could this be my map sensor, i have no check engine lights going off. oh yea when i reset the PFC back to the base map its fine but then back to the 1400 rpm at idle.

dgeesaman

iTrader: (7)

The first place I would look is the TPS. But the MAP could also be an issue.

The way to test the map is using a voltmeter and Mityvac - as the pressure on the map is changed, the voltage signal changes. There is a chart in the FSM to compare against.

As well, the TPS sends back two signals, one for the low end, and one for the high end. You check that using a voltmeter and moving the throttle (by hand is ok). You can find that also in the FSM.

Dave

7 BOUND

Thanks dave ? as far as the map goes when i tried to put the base mod map on my PFC I got that awfull poppin and black smoke is that from the map sensor going bad, or beter yet what would cause that? When i reset back to the base map everything is fine but but i do get high idle, then when i try to upgrade to the base mod map its goes to crap, ok let me share this with you.
i have a PFC from AP ENGINEERING in japan what they do is mod the PFC to work for the FC's i was told that all they did was change the map and the fuel cut to iginiton cut, and that was it, im thinking that if they did screwed with the main ROM my FD shouldnt run on that right? I can tell you this, Before A friend and I change the PFC back to the base map, i got the same thing that im getting now the pop and black smoke, we reset it with the datalogit and i was able to drive it just with high idle, thanks i know that got to be a lil long.

dgeesaman

iTrader: (7)

I don't know anything about PFCs. If changing tuning maps fixes the puffs of smoke then I would suspect the tuning and not the TPS or MAP sensor.

I suggest you try asking in the PFC forum.

[edit]: perhaps there is confusion between the 'map' of the map sensor and fuel map programmed into the PFC. They are different things, though they are related. The MAP sensor (Manifold Absolute Pressure sensor, aka boost sensor measures the pressure of the air entering the engine. Using this pressure, the ECU or PFC decides how much fuel to add to keep the correct Air/Fuel ratio.

The 'map' discussed in PFC lingo is a fuel map. In this case, map means like a chart or table. The fuel map is a table of numbers that the PFC uses to figure out what amount of fuel to inject given an RPM and manifold pressure. Tuning is all about choosing the numbers on this table. (It's not quite that simple, but that's the jist of it). But I'm not a tuner, so my discussion of PFC operation should not be considered gosphel.

So in a nutshell, the MAP sensor is different from the fuel map in a PFC. The PFC's fuel map uses the pressure detected by the MAP sensor. My apologies if you were aware of this.

Dave

alberto_mg

Sounds to me like whatever "base mod map" you are loading doesn't work for your car.

What is a "base mod map" anyway??

btw - try using paragraphs. your posts are too much of a clusterfuck to read.

7 BOUND

whats wrong with you alberto i didnt ask you to respond it clearly said dave, i mean really if you dont thave much to say then dont say it ( clusterfuck ) what i said is what i said tell me whats clusterfuck, this is not grade school and im not looking to get an A so chill please i just wanted some help on my ?

7 BOUND

For a person with 2,000 post you should know what the base mod map is, it comes with the new Power FC's and it supports, catback, intake, ic and soforth still cant get over ( clusterfuck ) lol i just re read what i wrote and if its not clear, then maybe someone needs some night classes

Herblenny

iTrader: (13)

Easy way to tell if you Map is bad is to go look at all the sensors on your PFC commander.

Under PIM you should see the voltage. with just ignition on you should see around 2.6V. If see way below or way above, time for you to get a new one and most likely you might have some shortening out somewhere.

What Map sensor does is it converts pressure into voltage. Sends the voltage to the ECU and depend on voltage it will find certain cell in your PFC map and act accordingly (in simple term).

I don't think its a map sensor issue. Sounds like you might have some leak somewhere or need to set your idle. Also did you remove the pins on your pfc? disconnect the idle control?? If you maps bad, you'll have really hard time starting your engine. Also, check your filter on your map and the line... but I don't think its sensor related.

Its usually a simple thing. Good luck!

Also, don't get bother by alberto, Us veteran forum members do get frustrated when we see same F*ckin posts over and over and over... And Newbs not searching and learning about the basics. Just little frustrated..

DaleClark

iTrader: (55)

IMHO I think the problem lies in the PFC you have. Lord knows what has been done to it by AP Engineering.

Have you put your stock ECU back in and driven around? Does the car run right on a stock ECU? If so, all your sensors are fine.

Really, I'd pony up and get the right PFC instead of goofing around with that one. You can get a new PFC for around $750 - pricey, but that's important enough to have something known good and working properly. Even if you get the car to run right on that PFC, who knows if down the road it will have other issues that could lead to a blown motor?

BTW, can you find someone nearby with a PFC that you can swap into your car to see how it runs?

Dale

Matt Hey

Go to setting 3 in the Datalogit. Look at <Pim Scale, offset> and make sure <normal> is selected and the scale is about 35086 with offset of 3947. These are the default numbers but could vary a little. The boost on the Commander should read a little negative but close to zero with the ignition on before starting. If this is all ok then you likely have a rather large vacuum leak. Fiddling with the idle screws probably put everything more out of wack. Look at the etc.->Sensor/SW check on the Datalogit and see if anything is highlighted.

7 BOUND

WOOOOOW THANKS GUYS, im sorry that i had to vent but io think your right i think that i have to get rid of this thing, but i tried to sell it to FC ANS FD owners but noone wants it ill let it go for $500, thanks again guys really