waterstrw

I am waiting on my cable to get linked up to my ECM.... I bought the cable from WOT electronics and plan to use Moates software for now.....

Here's my Q..... I am getting code 33 and have replaced all the maf relays, and the sensor.... I checked the TPS and all is good with it set to .60v.....

Symptoms: The car starts right up, then stumbled badly and almost stalls for a few seconds then the SES comes on and the rpms will rise and stays running.....

With the software I will be using what should I be looking for??? Or do i need to purchase the Tunercat or other equivlant software????

Thanks,
Tim

Pontiacdaddy

you want to look for MAF grams per second, I think if they go above 45 and you are under 1800 or 2000 rpms and the throttle is open less than a certain % or something like that it will throw the code. also check to see if they go up and down proportionately to the rpm and how much gas you give it.

I had the same problem. I thought i fixed it by replacing the relays but it returned. I have an 87 trans am. when the car was cold and i came to a stop and took off again i got the same stumble and the code was thrown.

you can sometimes fix this up by adjusting the throttle position sensor. if you have a service manual for your car read how to adjust the throttle position sensor and adjust it as high as you can get the voltage, or as high as the shop manual says is ok for idle. it might idle a little higher than it used to though.

if you learn to burn chips you can just change the MAF diagnostic error threshold up to like 55 grams per second and you wont get the code anymore.

waterstrw

I've tried everything in the book to get this to go away except changing the chip, or ecm.....
If I try to set the TPS to the correct voltage the car will run VERY RICH and it will idle like crap.... But if I set the voltage higher and lower the curb idle it will idle perfectly..... I get the code 33 whichever way I try it.....

The only way I may be able to find out what's wrong is to get into the ecm....

Thanks for the info,
Tim

Pontiacdaddy

When you are adjusting your idle speed are you just adjusting it so it idles like you want it or are you using the procedure in the shop manual for "minumum air" adjustment.

it says to warm the car up, shut it off and put it in diagnostic mode like you are reading codes and leave it like that for 30 seconds or so. after 30 seconds unplulg the wiring for the idle air controll motor under the throttle body and disconnect the est wire near the firewall then turn the key off, remove the paperclip or wire from the aldl plug and start the car. if it wont start adjust the throttle blades open more and try again. once it does start adjust the idle screw until it idles at like 550 in drive. after that shut it off again and plug everyting back up. then you will need to adust the tps again because any adjustment you made to the idle screw will affect the tps.

my car idled like crap after i installed my 52mm throttle body until i adjusted the minimum air according to the book, and then i had to reset the tps, after that it ran great. most of what we have been talking about will make a whole lot more sense when you start scanning your car because you will see the grams per second and the tps at all rpm's and iac steps at idle and much more useful info.

waterstrw

Yep, tried that..... The car would still run like crap.... VERY RICH!!!!! I completed the process to the T and still got the code 33..... If I tried to up the TPS voltage up just a tad the car would idle very high and not come down to normal.....

I blew my muffler apart at the seams trying to set the curb idle.... Once I got the idle down to 500rpm's the car started running real choppy so I brought it up just a tad.... After I hooked everything back up and tried to start it, the car let off one hell of a backfire!!!!!
Then I tried to reset my TPS but it never would run right with it adjusted to specs....

As of now, the car will stumble when I try to start it, but will run and idle fine once the SES light comes on.....


Tim

Grumpy

It's in soft-fail, or limp home mode.
Try another ecm/MAF, would be the easiest first thing to do. Or break out the ohm meter and verify all the sensors are with in spec..

SES light on is the sign of a serious and total malfunction.

waterstrw

I have already replaced the MAF, and both relays for it.... Also replaced the AIC and my TPS has a good steady voltage swing to it......
Now I'm to the point of it being the ecm that's why I want to get into it so maybe see if it could be something I can fix....

Once I can get into it and see if the ecm is getting the info it needs from the sensors.... I hope

Tim

waterstrw

OK, cable came in today and got linked up with the ECM. Below you will find what I logged.... From the way it looks to me, all the sensors seem to be responding to the ECM but I am not sure if they are within the specs they should be..... Can anybody shed some light for me..... I would really appreciate it.

Tim

waterstrw

Well looks like I can't attach the excel file???? Anybody know how to get the file on here????

RBob

iTrader: (1)

You have to be sneaky. . . Change the file extension from .xls to .jpg and post it. Then leave a note to the effect that it is an excel file.

RBob.

waterstrw

aa

waterstrw

Well how about this way, since I can't get that to work......

http://bellsouthpwp.net/t/r/trwssb/C...s/GM010402.CSV

This should link you too it..... I hope....

There are some more scans here

Pontiacdaddy

that is pretty much what everything looked like when i was getting that code also. That is the reason i started burning chips to get rid of code 33. the factory chip has the error diagnostic set at 45 grams per second on the maf. i changed mine to 55 and i have not had that problem since. It does appear that the maf on your car is working correctly though, as far as i can tell, but the only car i have to reference that is my own.

waterstrw

Thanks for the reply. I'm like you, I don't have anything to compair it to..... Hopefully one of the local guru's will pipe in and shed some light for me....
I made another run this morning from a cold start-up, I will get it posted tonight when I get home.....

I plan on buying the Promulator later this month, maybe by then I will understand a little more and be able to make the correct changes so my car will run better and quit giving me code 33...

Tim