tempting99

WHAT: I own a 99 Trans Am WS6 38K miles
MODS: Lid, Headers, Catback, NGK plugs, Kirban shifter & some suspension
PROBLEM: Since I have owned my car (BEFORE ANY MODS) I have had a funny hesitation or bogging during first/second gear when I first started driving the car. I just gave it more gas and BOOM it just took off... It has slowly got worse, MUCH worse. Now it does it when ever it wants too, cruising slight acceleration. It bogs wayyy down then as I give it more gas (sometimes it needs more gas than others) it will just kick in and go like normal. Sometimes it gets so bad that it would start to smell like gas and spit out blue smoke.
TO FIX: With no SES light, I tried doing some research and replaced: O2 sensors and the Throttle Position Sensor
DIAGNOSE: Finally it triggered a SES light with occasional flashing. I went to autozone where it called out the following. Fuel injector circuit malfunction and #6 misfire. So I figured that maybe it was my #6 fuel injector.
WHAT HAPPENED: While replacing the #6 fuel injector I noticed that there was some fluid in the injector connector and some corrosion. I compaired it to the others and the others all looked perfectly clean. So I thought I hit the nail on the head. So I reset the SES light, cleaned the corrosion and replaced the injector and off I went. First drive: PERFECT Second drive: Back to the same ole hesitation but still much smoother over all... Since there was signs of corrosion I ohmed out the connector 7K one way and 7M the other. I then compaired that to the other injectors and they all read 15M one way and open the other.....
COULD IT BE?? a bad connector, coil pack, wires, or some other electrical problem.
SOMEONE PLEASE HELP ME... I AM REALLY FUSTRATED AND NEED SOME GOOD ADVISE..:

jimmyblue

iTrader: (11)

Troubleshooting Rule 1: The one that's different
from the rest is wrong.

From the sound of it, a fried injector driver.
I don't know where these are, on our cars, but
I presume they're straight out of the PCM.

Troubleshooting Rule 2: Fix the obvious things,
and see if the mysterious things go away.

A malfunctioning injector messes up the whole
picture as far as the engine control loop goes.
Even a minor imbalance in flow leaves you with
(say) one cylinder in lean knock and 7 too rich,
because their pulse width gets varied as a gang
on the basis of average O2 sensor reading.

If your fried driver only was able to wake up
the injector when the pulse width got fat (as
will happen under load / WOT), you would
suddenly enjoy the sensation of 8 cylinders
instead of 7 and a dead weight. However, up
to that point, you would have 7 choking on
fuel and one huffing air, and the computer
sitting there all dumb and happy because the
averages came out right. Stanky and sluggish.

If it were only harness / connector corrosion
I would expect to see a symmetric resistance
in both directions, whatever the value (since
the good drivers are so high-resistance). I
think you find a place that will test your
PCM (unless somebody chimes in that the
injector drivers are someplace separate; if
it were me, I'd get those heat and noise makers
out of my box, but it weren't). Or, maybe, get
a junkyard box and try swapping? Sometimes you
can see 'em for sale used on these 'boards;
the 'yards will probably f%ck you just because
it's electronic. Just a hunch. And guess what
I expect from the dealers....

Anyway, find out that little bit and go.

You should replace any corroded connector,
while you're at it, because it will only be
a future intermittent problem waiting to play.
When the plating's gone, they're just going
to keep scabbing up.

<small>[ February 04, 2003, 09:28 PM: Message edited by: jimmyblue ]</small>