91Bird305

Code 33, 44, 53, and 54. WTF do all of these mean? I noticed one of my vacumm lines was off so I put that on and also one of my spark plug wires had come loose so I put that back on. But it was like that at the mechanic shop all day getting my fuel line replaced that I broke. Geez, what a day, anyways, what do these codes mean and where do I begin fixing my car? It will crank but won't turn over and those are the codes I pulled, thanks. Oh btw: when I was cranking it I noticed my throttle bores would fill up with fuel with just a second of cranking, that can't be normal, I think my fuel pressure is to high.

------------------
1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

PonyEtrZ28

code 33.
MAP Sensor. check vacuum hose(s) from MAP senor. check electrical connections at ECM.
REPLACE MAP sensor.

code 44.
lean exhaust. check for vacuum leaks.

code 53. i donno?.

code 54.
M/C solenoid. check M/C solenoid, and or replace.

------------------
1987 IROC-Z
355ci, Dart 2.02x1.60, compete forged bottom end, SLP siamesed runners, fully ported Edelbrock manifold and plenum, 58mm TB, Accel 26lb Injectors, Edelbrock headers & y-pipe, Flowmaster 3" cat-back, Rebuilt 700r4, B&M Megashifter, Holley 255lph fuel pump, triple guage pod, !A/C & Heat, !Smog pump, bypassed TB, MJS Ram air, custom PROM, Lakewood control lower control arms, Lakewood adjustable pan hard, Sub-Frames, Hotchkis Strut tower brace, Adjustable Torque Arm, 150hp NOS
IROC Pix

91Bird305

I think I could the code 33 because thats what vacumm hose was off.

I have no idea why I am getting a lean code when fuel is being dumped on me.

The Code 53 is the Vats, which I am not sure why it is going off.

Code 54 I thought was the volatage to the fuel pump and that might be because I have been trying to start my car and it won't start.

------------------
1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

91Bird305

Well I went out there and cleared all the codes by disconnecting the battery. So I did that and tried cranking it over and no go. I disconnected the injectors and put my foot to the floor and tried starting it that way thinking that it could still be flooded from earlier today (it was 3:00 and now its 8:00) and it still wouldn't start. I checked for codes and I have none now but the motherf-cker still won't go. Think it could still be to flooded from earlier in the day?

------------------
1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

super83Z

If you are getting a code for VATS that is why it won't start. Either something is wrong with your key or the ignition or the ECM is failing.

------------------
I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28
Superramed roller 406 10.5 compression, AFR 195's and custom cam.

future mods:
N20 waiting to be installed

Wifes new car:

1995 Z28
AT, leather, T-tops bone stock for now. 250 RWHP 300 RWT 14.0 @ 99 MPH on a 2.2 60'

future mods:
header to tailpipe replacement and a cold air intake. Then I am just going to leave it alone (maybe)

91Bird305

Ok, just checked my plugs and they are completely BLACK and I have no spark. What now

------------------
1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

91Bird305

Just checked for spark at my coil and no spark there either. Also just checked my fuses and there all good.

------------------
1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

[This message has been edited by 91Bird305 (edited July 31, 2002).]

triumph

Code 53 is NOT VATS......it is System voltage high/low ........Code 53 will set if the voltage at the ECM/PCM is greater than 17.1v or less than 10v.....check charging system........if that is known to be good your ECM is FRIED that would explain Y your having so many differnt codes and your Tbores are filling with fuel check your oil and see if it smells like gas bet it does. Also look at this.... your plugs are black yet you have a code 44(lean condition). The dead give away is the system voltage.GM computers from the late 80's to early 90's go bad. My mom has a 90 corsica and i have relaced that ECM twice.The first time it had almost the same codes as you and the had no spark and the injector was pissing fuel when you turn the key and filled the crankcase with fuel.Shop around for an ECM and get one with a lifetime warranty.....im glad i did when it went again. Steven

91Bird305

That is some reasurance my friend. My buddy Joe is sending me his old computer that is excactly like mine tommorow. Hopefully your right and the problem will be fixed.

------------------
1991 Firebird 305
Eric Natzke
"It ain't Stock"
http://members.aol.com/j007golden/91firebird.html
AIM: J007Golden

GMTech

I know I'm probably going to get blasted for this, and probably tons of hate mail, but posts like this crack me up. What real value did this reply serve? Anybody can copy stuff out of a book, and it wasn't even a very good book at that.
"Check vacuum lines, check connections at ECM, replace MAP sensor". How generic can you get? So I guess thats all that goes wrong w/ them? And an M/C Solenoid? Do you even know what that is? Obviously NOT if you think his '91 305 has one...

Just my .02¢, but leave the "book smarts" out of it. This poor sole could have gone on one hell of a wild goose chase


------------------
Webmaster:SETHIRDGEN
GM Tech
ASE Master Auto Technician + L1
1987 Trans Am: 357ci
Ported TFS heads, ZZ4 cam, headers & exhuast and other go fast goodies
13.53 @ 103.77

[This message has been edited by GMTech (edited August 01, 2002).]

PonyEtrZ28

well hey man, if he doesnt know what the codes mean. some one has to tell him. i know i didnt tell him what to do.
so why dont you give him a hand. im sure you know what to do. am i right?
and yeah i see your point in saying somthing.
but hey maybe from now on ill just sit back and read stuff and just make comments like yours.
later,
shaun

------------------
1987 IROC-Z
355ci, Dart 2.02x1.60, compete forged bottom end, SLP siamesed runners, fully ported Edelbrock manifold and plenum, 58mm TB, Accel 26lb Injectors, Edelbrock headers & y-pipe, Flowmaster 3" cat-back, Rebuilt 700r4, B&M Megashifter, Holley 255lph fuel pump, triple guage pod, !A/C & Heat, !Smog pump, bypassed TB, MJS Ram air, custom PROM, Lakewood control lower control arms, Lakewood adjustable pan hard, Sub-Frames, Hotchkis Strut tower brace, Adjustable Torque Arm, 150hp NOS
IROC Pix

PonyEtrZ28

by the way 91bird305
did you try the ecm? did it work out for ya. just wondering how its going for ya.

GMTech

No need to pout, but NO information is better than misinformation.

Here is a rundown:

33 Code 33 is for high MAP sensor voltage as measured at the ECM, CKT 432. If you loose your sensor ground, the MAP sensor internally shorts, you loose vacuum, or if there is an internal ECM fault, This code will set. Cars that won't start or run poorly can also set a MAP code, but its usually code 34 for low voltage (or high vacuum) because they can pop back through the intake, and since the MAP sensors on these cars are a 1 bar sensor, they cannot measure excessive pressure, therefore the ECM (it cannot read excessive pressure either) the MAP signal is now well out of range and the 34 sets. Since he said a vacuum line was left off (which one was not specified) we will assume that was the problem unless it resets.

44 Code 44 is Lean Exhaust. MAP sensor woes can cause a lean condition, but thats usually in conjunction w/ code 34 for high vaccum. Low vacuum will cause a rich condition. So we can probably rule that out. Take a good look at your O2 sensor wire. If its rubbed through to ground or melted to the exhaust, it will pull the signal voltage low (low voltage indicates lean mixture). Its possible that maybe the car really is running lean, but untill its actually running, you may never know.

53 Code 53 is VATS system malfuntion. Either the key is bad, or the lock cylinder is bad (9 out of 10 times, its the lock cylinder). Could also be a bad PassKey decoder module or a bad ECM. Don't see to many of them go bad, but if the car will still crank, and the start inhibit relay is NOT bypassed, yet the code still sets, then it could be either of the later. This code does not stay in the ECM's memory, so if you can pull that code, then its CURRENT and may be the source of your no-start.

54 Lastly, Code 54. This is for the fuel pump circuit. The ECM can monitor voltage going to the fuel pump. If the ECM does not see 12V from the relay during the 2 second initial prime, then this code will set. So you may either have a bad relay ( and the engine is relying on the oil pressure switch) or there is an open in one of the electrical circuits. Of course, its always possible that a bad ECM can cause one or all of these codes, I have seen wierder. If you have a spare ECM, definatly try it, these ECMs are easy to get to.




------------------
Webmaster:SETHIRDGEN
GM Tech
ASE Master Auto Technician + L1
1987 Trans Am: 357ci
Ported TFS heads, ZZ4 cam, headers & exhuast and other go fast goodies
13.53 @ 103.77

GMTech

Geeze, not again... Code 53 IS VATS. Get a real service manual, throw the Haynes/Chiltons BS in the trash. Go to www.helminc.com and hook yourself up. Different years/models/engines can have different faults for the same code. You can't assume that a code 53 for one car means the same for EVERY car, just like the "Code 54: M/C Solenoid" on a 1991 F-body


------------------
Webmaster:SETHIRDGEN
GM Tech
ASE Master Auto Technician + L1
1987 Trans Am: 357ci
Ported TFS heads, ZZ4 cam, headers & exhuast and other go fast goodies
13.53 @ 103.77