Gettin a code 21, 94Q45, 80K.

Well the slight knock at idle is gone, but I just dosen't feel right. Now I get a code 21, ignition circuit. Seems like all 8 ain't showin up.....This is what I did this AM.......

Got around to take a test drive this morning. 94Q, 80K.

Started up, idle at 1200, cool.

Turn on A/C, went down the street @25mph.

Stopped, took a left onto a 55mph zone, car now felt like it was running on 4 cylinders, (vibrating like on square wheels) this continued for about a mile.

Stopped at the Bank for 10minutes, back in the car, startup fine. once back on the 55mph road, floored it @ 30mph, downshifted fine, upshifted fine till I lifted @ 90mph.

Got home, run diagnostic 2, got code 21...I guess that is because of the rough running...

Cleared the code, ran at 2000rpm...no load.

Now I get 5-5 code.

If I have a bad power transistor/coil whatever, wouldn't it stay bad?

Sounds like a bad connection to me. I pulled all 4 of the connections on the valve covers, shot contact cleaner in the plug connectors.

Make sense?

I had this rough running before I did the KS, but it only lasted about 3 minutes...and would go away for months, then come back...

What have ya'll done to correct a code 21?

It does sound like a coil pack or possibly a sensor wire. What are the conditions of your spark plugs?

I guess I'll be checking the continuty on the ignition wires and plugs tomorrow...

Sure would be nice to have Plug wires...:-)

Meaux wrote:Sure would be nice to have Plug wires...:-)

Not really. Coil on plug far more advanced and reliable.

Code 21 is ignition signal. Look on page EC-96 for the diagnostic procedure.

Well, the heck with it...I can't get it to mess up now, so I'm gonna button this up.

It upshifts/downshifts normal, stumble is gone, it just don't sound right. At the tailpipe it has a slight "poop" to it.

Hell, I dropped a 10mm wrench down behind the IAC valve and can't get it out with a magnet...can't even see it...PITA cause I wasn't even using it.

As soon as I remount the ECM, and install the deco covers, it'll mess up again....

Thanks.....

Well, as luck would have it, the rough running came back.

I unplugged the #1 injector, and it ran REALLY rough, then I unplugged #2, and that closley matches the condition, so I'm assuming my ignition problem is on the RH Passenger side...

I posted this onthe "mechanic Forum" also, but seems that Forum isn't read as much.......
Modified by Meaux at 4:32 PM 9/13/2005

I'd check the coil packs and the wire harness. I know this problem would drive me crazy, so I guess I could say "way to hang in there". 21 is the only code being thrown? Sounds like your misfiring like a mug. Might just have to take it to the foreign auto shop and have it looked at. Or start replaceing more items.

red

Meaux wrote:Well, the heck with it...I can't get it to mess up now, so I'm gonna button this up.

It upshifts/downshifts normal, stumble is gone, it just don't sound right. At the tailpipe it has a slight "poop" to it.

Hell, I dropped a 10mm wrench down behind the IAC valve and can't get it out with a magnet...can't even see it...PITA cause I wasn't even using it.

As soon as I remount the ECM, and install the deco covers, it'll mess up again....

Thanks.....

I feel your pain but you sure as hell made me laugh with the 10mm wrench story. I found a screwdriver in my airbox the other day that I hadn't seen in a long time, I thought my wife swiped it...

I got the front end in the air yesterday and still can't find the dang thing. I reckon I lost it on a test drive......Oh well...