You jumper pins A and B on the ALDL connector to read trouble codes. The Fiero Store sells a piece of sheet metal to do the trick. I just used a piece of #12 copper wire in the
past.

For some reason I had a burnt out fuse from the 2002 Tahoe in the Fiero. Turns out the spacing is almost exact. I tried a fresh fuse and it worked nicely. There are 3 sizes of blade fuses (physical size) that you can buy (well maybe 4 if you include the ginormous ones). The smallest size that is used on more recent GM vehicles is the one I found that works to jumper the pins. This is the next size smaller than what is in our Fieros.

Now if I can just figure out why the idle is 1500 to 2000 but no codes, I'll be good. For a while the EGR gasket was leaking right at the EGR valve. A little red Permatex fixed that but now it is idling high again :-( I was surprised that starter spray was a good way to see where the vacuum leak was.

Swapping the TPS off the white Fiero is the next step.

quote Originally posted by Ray_and_kevin: You jumper pins A and B on the ALDL connector to read trouble codes. The Fiero Store sells a piece of sheet metal to do the trick. I just used a piece of #12 copper wire in the past.

This is the high-priced piece of hardware (with minor modification) that I use.

Same here.

Yes, I used that particular tool in the past as well. The nice thing about the really little fuses is that they are insulated and hold in nicely. I always worry about a paper clip shorting out to the chassis (but since that is what you are doing anyway not much of a problem.) The fuses stay put without danger of falling out.

Found my high idle. The flange on the new EGR tube seems to be slightly warped and leaks just a smidge of air. Blasted the EGR valve end with Starter fluid while home at lunch today and got the normal "slows the engine" response. I have the flexible armored tube from the Fiero Store. Permatex worked for a little while but it is leaking again. Scratching my head on this one!

[This message has been edited by Ray_and_kevin (edited 12-14-2016).]

quote Originally posted by Ray_and_kevin: The flange on the new EGR tube seems to be slightly warped and leaks just a smidge of air.

The solution is to remove the tube and file the flange flat. There's no point just trying to goop up the gap!

[This message has been edited by Patrick (edited 12-15-2016).]

I knew I bought a mill for some reason :-)
Good suggestion!

Be careful...
Many ALDL have been damage by people jamming too big of a jumper.
That can cause problems when you use a ECM scanner.

Paper clip works but small size to easy fit the terminals.

ALDL can be installed two ways...
See my Cave, ALDL/ALCL

Lisle Wire Terminal Tool 14900 has a jumper and Weather-Pack etc terminal tools. (Does not have tools to work on Metri Pack ends)

------------------
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.
(Jurassic Park)

The Ogre's Fiero Cave

[This message has been edited by theogre (edited 12-15-2016).]