Hey guys, I am getting a check engine light a few minutes after i start my fiero, 85 GT.. still bone stock, The check engine light seems to go off after the engine warms up and the engine bay is warm too, If i turn the car off for about 10 seconds then start it again while the check engine light is on, it goes away for about a minute and then comes back on, What could it be? is something not functioning right until it gets warm? I dont feel or notice any difference in handling or acceleration while the light is on... Any help would be greatly appreciated.

Thanks in advance

Take off access panel to ALDL, which is the plastic panel that the cigarette lighter is in. With a paper clip bent in a "U" shape, ground A and B terminals of ALDL, turn ign to on. SES light will flash code 12 (flash....flash,flash) three times, then any error codes will flash three times, then back to code 12. Find out what the error code is and let us know......Paul

...yes check your code via the port by the cigg lighter...could be that its just the idle speed being 50rpm high(orlow). That will make our little yellow fellow come on. After the idle resets to spec it behaves. If this is all thats buggin your ECM....man are you lucky
REd

well it doesnt come on at idle only.. it comes on while sitting and idling OR driving do ill go check that.. thanks!

[This message has been edited by Weponhead (edited 01-06-2004).]

quote Originally posted by Paul Prince: Take off access panel to ALDL, which is the plastic panel that the cigarette lighter is in. With a paper clip bent in a "U" shape, ground A and B terminals of ALDL, turn ign to on. SES light will flash code 12 (flash....flash,flash) three times, then any error codes will flash three times, then back to code 12. Find out what the error code is and let us know......Paul

Sorry to butt-in, but the A and B terminals are on bottom left of connector first 2...with the key(notch) on connector pointin down...just incase ya didnt know...

thanks index, i figured it out VIA the ECM codes link on the main PFF page, Im getting code 23 my MAT sensor.. is it urgent that i replace this? what could it effect? Any help is greatly appreciated thanks..

Weponhead

You and your Fiero are at great risk.....Imagine a ball of fire going 65 miles per hour around the Capital Beltway.....ahhhhhhhhhhhhhhhhhhhhhhhhh....you must give your car to me or die......aaaaahahahahahahahahahah(evil laugh)

Lovingly, Your Dad,

Powerstroke
(Really, I am weponhead's dad)

quote Originally posted by Weponhead: thanks index, i figured it out VIA the ECM codes link on the main PFF page, Im getting code 23 my MAT sensor.. is it urgent that i replace this? what could it effect? Any help is greatly appreciated thanks.. Weponhead

It sends a signal to ECM to adjust fuel/timing based on the incoming air temp. I would say the electrical connection could be bad, or the sensor itself. I would replace it and if you still have the problem, then the connector or wires are shorting......Paul

BTW, it is located on the outside of the air filter cannister.

[This message has been edited by Paul Prince (edited 01-07-2004).]

It bolts on it and i belive it goes into the air canister, ive yet to pull it to examine it, too damn cold outside doesnt break freezing much.. need to clear out the garage and fire up the heaters and do some work ...