Is my map dying?

[bansheenut420]

The last two mornings, the RT has been kinda hard to start. Its been cold, but its been alot colder and its never had a problem. The first time it did it, I let it warm up for a few min, came out and the zeitronix was reading in the 12s for a/f ratio. While idleing. I figured it was because of the fuel enrichment when it was cold, and left. The car ran like a dog at first. A/F in the 11s-10s and I even saw a 9 somthing. It was struggling to run because it was flooding itself out. After about 1/2 a block, she was fine. Back to her normal self. 14.7 a/f all the time other than decel, and ran just fine. This morning, I go out and start it. It starts fairly easy, but once the zeitronix comes on, I am back to low 12s on the a/f. I leave it be for about two min so it could warm up. I come back out, and its struggling to idle again. So I get in, and give it some gas to clear it out. It starts blowing some steam out of the exhaust, alot actually. Which scared me, and made me shut the car off. I popped the hood, and found that between the first time I drove it, and right then. I used an entire tank of meth. Which explained the steam.
I get to work and start to think about it. The only way that meth can fire, is a signal from the map, or bad wiring on my part. So I go out and check the wiring and notice that the tank is once again empty. So, it went though a tank in 12.5 miles that normally takes 220 miles. And the car seemed to run weird, but not that weird. Checked all my wiring and it was fine. So I start the car to leave work. Everything is fine, untill I pull out of the parking lot, and it goes back into the 9s and dies. I am now frustrated, thinking that the meth kit is acting up. So I unplug it. And still the car runs like sh!t. Finallly after about a block, it clears up and runs fine.
I cant think of any other sensor that could cause this. I could understand if it was just running rich, but making the meth fire says map sensor to me.
What do you guys think? I had the scanner in the car both times, and didnt think to hook it up. I will next time. But once its warmed up, it seems fine.
Thoughts?
Sorry for the long post, but I felt it need a good description.

[crazymadbastard]

perhaps there is water in the map line and it freezes and gives you sh!t?

[bansheenut420]

hhhhmm. Thats a good thought. I will check that.
Thanks

[crazymadbastard]

You're probably overdue for a disassemble, clean and tighten of all connectors.

[mopar2ya]

You might need to put a solenoid between the meth pump and tank if its leaking when you shut it off. Remember the MAP signal cames from the baro read which comes from the intake. Ive had a baro read mess up, but that was a who different set of driveability issues. What about a O2 sensor? If your burning off a ton of meth on starrtup that could mess with it.

[bansheenut420]

The meth kit isnt leaking, its being triggered. And the only thing its hooked up to is the map sensor. The o2 sensor reads fine according to the wideband as a reference. I thought about other sensors making it run rich, but the only one that would make the meth consantaly run is the map. Unless somehow the progressive controller has gone funky, and is firing it when it shouldnt. But, that wouldnt explain why it ran so bad when I unhooked the power to the meth kit. I am confused. lol
Thanks for the help and input guys!

[bansheenut420]

This is also a stupid question, but does it matter if the line coming from the intake to the barro sensor is onthe top or bottom bung? I know it got unhooked recently, and maybe I put it backwards when I put it back on?

[DaPepster!]

Quote:

Originally Posted by bansheenut420 This is also a stupid question, but does it matter if the line coming from the intake to the barro sensor is onthe top or bottom bung? I know it got unhooked recently, and maybe I put it backwards when I put it back on?

Yes it does. The baro solenoid is used to switch the MAP sensor from reading between atmospheric pressure (de-energized) and manifold pressure (energized) during closed throttle positions for boost control.

The MAP sensor should be on the middle barb and the manifold hose should be on top leaving the bottom to the atmosphere.

[bansheenut420]

Thanks!
And it did act up again today. With no meth kit hooked up, went to high 12s a/f. And I had the scanner hooked up and it looked like the map voltage was fine.
I am lost. lol

[xtrempickup]

if its triggering the alki to pump you should see the light on the progressive controller blinking?

[bansheenut420]

I wasnt looking. lol and yes you should. But it went somewhere becuase its used two tanks in 25 miles. lol But its unhooked now untill I figure out whats up. Back to stupidly low boost Boy I wish I had my cal!

[bansheenut420]

So the car pulled its trick this morning again. lol But this time, it was idleing fine at 14.7 a/f. I didnt have the scanner hooked up again. : But once I got home, I decided to check codes and got. 21,45,52. I am now begining to think it got to be the map. But the weird thing is, the car has not hit overboost, at least noticeable throw you though the windsheild overboost, in probably a month. So unless it just takes going over 15 psi, which it has spiked to, but falls very quickly, to trigger the code. I am stumped on that one. The other two are o2 sensor rich/short codes. I figure from it going stupid rich, but I dont see how that would cause the problem.
I am thinking the map is wacked out when its really, really cold (5 deg this morning) and makes the computer think it has a load on the motor and needs fuel. The wacked out map would also explain why the meth is acting up.
Would it even idle if this were the case?
Thoughts?
Thanks in advance guys.

[lotashelbys]

Quote:

Originally Posted by bansheenut420 The other two are o2 sensor rich/short codes.

Did you ever check continuity at the O2 plug to say the harness connector behind the battery to see if your O2 wires are intact? If not do that and maybe lengthen the wires and tie them up around the harness
on top of the firewall. Does your O2 voltage switch from rich to lean on the OTC at idle? It should......

[bansheenut420]

Yeah, once I got the scanner hooked up, it was bouncing back and forth. Pretty much in sync with the wideband. I havent looked at the wires since I put the car back together, but I did lengthen them so they wouldnt get toasted.

[bansheenut420]

Quote:

Originally Posted by mopar2ya You might need to put a solenoid between the meth pump and tank if its leaking when you shut it off.

We have a winner, Wallace was the closest. My check valve has taken a crap or something and is syphoning meth under vac. Which explains pretty much everything. I checked the map signal again today, and it was fine. So I guess I need a new check valve. I hope I can get it working so I can use it this weekend when the R/T dines on some fine german sourkraut, er uh some veedub!