Alright car is running a little strange recently and my check cash light poped up yesterday. Tomorrow im replacing my ignition system (hopefully the problum), but id like to track these down first.

Im getting codes 33 and 34 which both say the MAP sensor is bad. I am very sure I dont have any vaccume leaks and I just replaced my egr a few months ago.
Also im getting a code 21 which says TPS is bad!

What should I do?

Edit, just noticed I really fudged up the spelling on this. Ill leave it uncorrected so you can all laught at me .

[This message has been edited by ManiMack (edited 03-01-2004).]

I jsut replace the wires and distributor cap, smoothed things out allot but unfortunatly didnt fix my hunting idel.

I was talking to the guy at canadian tire. He told me if im having a hunting idel and bucking when coming to a stop it is defenatly the map sensor. Plus my codes 33 and 34 say the map is dead.

This sound right? I really don't want to spend 100$ on a new one if it doesnt fix my problum. Plus im geting a code for bad TPS as well.

[This message has been edited by ManiMack (edited 03-01-2004).]

Yes, it does SOUND like your MAP sensor is bad, but one thing I learned in GM training 20 some years ago, is to always repair the lowest code first and the map and tps do work in conjunction. Clear the memory and see which code comes back first. I'd bet on the tps and I'd try another tps first....used if you can.....before I bought a map sensor that I didn't need. Good luck.

Phil

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87 FIERO GT 2.8 5spd

GM auto tech for 27 years. Specializing in electrical and computer problems. Now on workers comp. and it looks like I will be unable to return to work as a tech.

[This message has been edited by GTDude (edited 03-01-2004).]

Mack,

You may want to do some testing before you plunk down cash for new sensors. The TPS is especially easy to check. The schematic and procedures can be found here....

http://www.syty.org/old/d&e.html

Just follow the link for the trouble codes. Make sure you bookmark this link. This is good stuff.

Mark

Yep, and the problem with the MAP sensor can just as easily be the vacuum line connection to the MAP sensor, not the sensor itself.

JazzMan

quote Originally posted by GTDude: Yes, it does SOUND like your MAP sensor is bad, but one thing I learned in GM training 20 some years ago, is to always repair the lowest code first and the map and tps do work in conjunction. Clear the memory and see which code comes back first. I'd bet on the tps and I'd try another tps first....used if you can.....before I bought a map sensor that I didn't need. Good luck. Phil

all my training points me in the direction of replacing the cheapest parts first. (training ='s my experiance fixin stuff)

quote Originally posted by Mark: Mack, You may want to do some testing before you plunk down cash for new sensors. The TPS is especially easy to check. The schematic and procedures can be found here.... http://www.syty.org/old/d&e.html Just follow the link for the trouble codes. Make sure you bookmark this link. This is good stuff. Mark

Mark, is that link for the 2.8? I think the 2.5 and 2.8 have different codes, don't they?

Some good advice here... thanks guys
Im going to diag. the tps tomorrow, and do some more troubleshooting . I know electronics really well, and love to do this stuff.
Its hard to find the time recently though. But I have some free time coming up soon that im going to use on my baby ( 86se )

If all goes well I wont be posing in technical tomorrow..

Oh on another note... Damn was my distrbutor cap/rotor bad. That thing looked original... I droped in a bosch to replace the pos. It really only took me about 2 mins to change that. Why didnt I do that least year ?

Just an update. I finally got my new TPS installed. This was the problum all along.

Car is running like new again!

Thanks for the help you ppl are the ebst!