I still have trouble to get my car running good, I get an MAP error 34, I know I must have got a 2 or 3 bar MAP sensor since it is for boost and have runned right but now its giving errors.
I read that everyone uses GM part# 12569241 for the 2 BAR MAP sensor, and since on my standard motor products MAP sensor there was no partnumber, I have ordered a GM 12569241 module.
first I got the ECM error 34 ( MAP) on the moment I turned on the key, but not even have started the engine, after replacing the MAP sensor for the new GM one, I can start it without errors, but after the first turn, gaspedal loose, and then giving gas the error was coming again up (code 34).
It has worked, I bougt this car good working, the exowner dont remember what he has done to the MAP sensor to get it right so that doesnt help also..
Maybe its programmed for an 3 BAR MAP snesor, other 2 BAR sensors with other signal reference for the ECM, i dont know it anymore, can somebody help?

Also I am getting interested since I now already got an 2 BAR map sensor from GM part# 12569241, and the same new from standard, part# AS4, if there is somebody here who can "burn"me a chip for my 86 ECM (1227170?), or for an 85 ECM I have laying around here also, or some email/website adres of someone who can do this job?

Mark
The Netherlands
Fiero GT Turbo V6 3.1L

[This message has been edited by FieroFanaticFromHolland (edited 01-28-2006).]

You have to have the correct sensor for the programming in the ECM/PCM... If you are using a 2 bar and the ECM expects a 3 then you'll have problems and same other way around.

The ECM part number doesn't really mean anything beyond which model of ECM it is. You have to know what program is loaded and what that program expects. The same ECM can be used on many models and often with a bunch of configurations.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurasic Park)

The Ogre's Fiero Cave (It's also at the top of every forum page...)

I have the EXACT same problem on my turbo engine now. Exactly. I have reinstalled the stock MAP and stock chip and the problem is the same. A friend suggested that it might be a clogged catalytic converter and I have to check that. But tomorrow I will check to see if the voltage readings on the three wires leading to the MAP is correct. is it possible that a clogged CAT could cause so much back pressure that the engine is just drowning in unburnt fuel and stalling as the "exhaust" has no place to go?

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quote Originally posted by Firefighter: Mark - Goede Ochtend mijn Fiero vriend. Wij hebben het zelfde probleem met onze auto. Het is zeer frustrerend geweest. Marr ik denk als wij samen wij kunnen het probleem oplossen werken. Ed

Showoff. But I am on to you: babelfish?

If you are looking to get the ecm re-programmed I believe darth fiero could help out with that. His website is www.gmtuners.com . He has very reasonable prices and will program your chip however you would like it. I have a chip from him and his turn around time is always great!

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--180* t-stat, (cam degrees) 1.5 degree intake advance and 5 degree exhaust retard, ported lower intake, FFP pulley, A/C Idler, flowmaster exhaust, EGR delete, K&N filter, chip-- --Check out the Fiero Kingdom!--

Thanks for the responce!, @ Firefighter, (ook goedemorgen!, heb je dit via een vertaal machine gedaan? heb jij het probleem al kunnen oplossen?)strange problem we have he?, I dont think this could be something to do with the CAT being clogged up, I have replaced that one for an "black bomber"/straight pipe, so that cannot be the problem in my configuration.
The frustrating thing is that it has worked for months since I bought it, it blew the MAP sensor from standard, there are no partnumbers on the modules from standard, and now I am stranded to find the right one...
I have ordered at the garage, 12569241, to find out that these are giving errors as soon as I play with the trottle, so I kept looking for another module, since my exowner thought to remember to use a module from a GMC Syclone, I looked at one from these cars.
That partnumber was 16009886, new part number 16254539, but in the box was the partnumber I already had, 12569241, all the modules/partnumbers from GM came to the same module!?!?!
So, since it was an standard motor products MAP sensor I got to that site, www.SMPcorp.com, and looked for an MAP sensor for an 91 GMC Syclone, part# AS4.
Also I looked up trough that site what standards part number would be for the GM 12569241 module everyone seems to use with an custom turbo install, it came up as AS100.
I sended an email to standard, to get info about the difference between the AS4, that came up for the GMC Syclone that I was looking for, and the AS100/12569241, the one that the GM dealer keeps ordering for me, and the told me the only difference was the "keying in the connector, all the internals where the same and signal signal references, AS4 was "superceded"by AS100...
And that one dont work for me (anymore?), that sensor make my car go into SES/ linping back mode, I can drive it, but if I give to much trottle, half way down and more, the enginge goes sputtering, and backfires trough the inlet if I hear that correcly..what else could couse some thing like this
So, since all the 2 BAR MAP sensors are using same reference signals, thay only have different keying, all the partsressellers keep telling, I really beginning to think that there is an 3 BAR MAP sensor programmed in the ECM, why will it else not work, tell me if you have the idea...

I like to trouble shoot with you!, my email adres is m.hazelzet@zonnet.nl

I just got to the car to test again some stuff, I put in the MAP from GM, put the battery cable back on, checkt for errors and only got 12.
Then I turned the ignition off, and put the WINALDL cable on the connector, turned ignition on to see a error 34, MAP error!
I again put the simple paperclip back on to go in diagnostic mode and now it got also got a code 34, and 12....

Looks like an electrical failure/problem(sensor incorrect...).....atleast if I hook up WinALDL I get that error on instant, else after I start it up.

[This message has been edited by FieroFanaticFromHolland (edited 01-29-2006).]

bump it to da top!

Mark - Do you know the GM number for the 2 Bar MAP Sensor connector? It is the three pronged connector similar to the stock connector. The stock connector will not fit the 2 Bar MAP, and although I have made it fit, I want to get the correct connector. My local GM dealer does not list the connector but has the 2 Bar MAP that will only fit into the mystery connector. How can a part be in stock which ONLY fits into a connector that GM does not list????
Good Grief; no wonder GM is in so much trouble. Ed

Heres some link that Scott-WA replied to me in another topic, I dont think its listed, but maybe you can go further with this info. http://www.fmsiinc.com/gm-pigtails.htm
I also "modified" my old 1 bar connector to get it connected.
Today I hope my AS4 module from standard is being delivered, if that doesnt work, I think I am gonna try a 3 BAR MAP sensor, if that isnt also the fix, I am gonna burn me a new chip!

[This message has been edited by FieroFanaticFromHolland (edited 01-31-2006).]

I am getting the correct connector from GM on the morning of Feb. 1 st. I will give you the correct part number or I will get one for you and mail it to you. I am sure that the connector is not the problem, but I feel more comfortable with a part that I did not modify. Ed

Today the AS4 module was delivered, I connected it to see the (for me already) infamous ECM error 34....(battery disconnected first to clear the errors already in the memory...)
So, since that module didnt work for me again, I am really biassed to: 1 wireing/shorting problem, or 2, my ECM is programmed for an 3 bar version
If I put the ECM in diagnostics mode before I start it, it will only give code 12, so thats good.
But after a startup(try) the ECM will give error 34, could this be something to do with wires that are shorted or something?, but since its giving errors after my engine tried to run, and not before, I thought the wiring is working, its give signals to the ECM, only the ECM thinks the signal output in out of range or something and start giving a MAP error.
When I hook up my labtop with WinALDL, I see no MAP voltage, engine not started, never tried with it running, because I get the error 34 even before I tried to start the engine.
I am going to order a 3 bar MAP module from GM, maybe my ECM is programmed for one, I cant check the file loaded to the PROM, is that even possible?, how do you check this?
Could this be a wiring problem?, shorting somewhere?, how can I test the circuit?

[This message has been edited by FieroFanaticFromHolland (edited 02-02-2006).]

bump it to da top, some quality info is needed

Mark - the GM part number for the 2 bar MAP connector is GM # 15305891. The connector I have is white, but I have seen ones that are orange in color. If you need one I will get one for you and mail it to you. Please let me know. I do not know if GM has a connector for a 3 bar MAP. Ed

quote Originally posted by FieroFanaticFromHolland: When I hook up my labtop with WinALDL, I see no MAP voltage, engine not started, never tried with it running, because I get the error 34 even before I tried to start the engine.

Looks like a wiring problem. Pull the wiring harness off the map sensor and jump terminal B to C (green to grey). Then with the ignition on, windAlDl should read map voltage as 4 volts.

It's not from a Fiero manual but it is GM and the code matches the problem so the diagnostic process should be the same as what's in a Fiero manual. This is from my shop manual for the 86 camaro. Since the signal is low, in the event that the wiring checks out and the chip is switched properly, and the problem persists retard the timing to see if that will help. The 2.8 of the same years in the camaro ran a base timing of 6 degrees, maybe giving up a little vacuum by way of retarding the timing might help with the low signal if everything else checks out. I doubt any of the stock turbo cars have 10 degrees base timing like the fiero anyway. Hope it helps.

Thanks to all for the reply's and info!, I have cleared all the codes by removing the battery cable, then I hooked up my labtop with WinALDL.
I get code 34, engine not even started, when I look at the sensor data I see the MAP tabel, there is a value of 1 and 0.0 voltage...
When I jumper on the MAP connector B&C, (green and grey) that doesnt change the voltage, it stays at 0.0 volts
Then I switched in my old ECM, one of an 85GT, but I get excacly the same results, no voltage, and the error 34.

I would unplug the computer and probe the wires at the MAP and ECM plug for a continuity and resistance check.

Looks like a faulty circuit. Check for open or shorted circuit from the map sensor harness to the disconnected 32 pin ECM harness.

A. should be fine
B- (green) to C11
C-(grey) to C14

Firefighter, are you still having MAP problems?

-Mike.

[This message has been edited by LordBoOsT (edited 02-04-2006).]

PROBLEM IS SOLVED!!!, it was indeed a loose wire from the MAP connector, I really feel stupid, but pleased that it is back alife!!!!
Some stupid who own the car before me cut the wires loose, and reconnected them to the same wire, the grey one was loose, now it runs like a champ again!
thanks for all your support!

A happy fiero owner
3.1L V6 Turbo GT 86
The Netherlands

"+" for me and Joseph is thanks enough

I already gived you and Joseph Upson a + because you deserved it by giving good info!, dont worry!

Thanks all that have been of help.