[T3] cool weather idle hunt
Bobsnotch at aol.com
Bobsnotch at aol.com
Tue Jan 17 16:53:15 PST 2017
In a message dated 1/17/2017 7:12:25 P.M. Eastern Standard Time,
d.nohejl at gmail.com writes:
When replying, please consider trimming your message. Thanks! :)
O, boy, what a mess!
Car started fine this morning but idled very roughly when cold. I made a
note to myself to adjust idle and timing after work in case changing the AAR
adjustment threw off the idle speed. I figured that was possible depending
on where the AAR was set when I last did the idle.
After getting off the highway on the way to work, the motor stalled every
time I took my foot off the gas but for one time when the idle stayed
steady. After work, it took five tries to start the car. Very unusual as it
always starts on the first or second try. I pulled out of the parking lot and
stalled. I then proceeded to stall every single time I let my foot off the
gas but it drove perfectly well on the highway. I got close to home and
stalled at a light. This time it wouldn’t start. It caught on one or two
occasions but wouldn’t fully fire up. Then, it’d crank and crank but nothing
else. Of course it started pouring rain after a few minutes…..
Anyway, I checked the following partly by myself and partly once Jessica
showed up (the benefit of breaking down only 2 miles from home)…the list isn’
t in sequence:
—fuel pump relay clicked and pump primed when key was turned
—FI power relay clicked when key was turned
—MPS sensor plug wasn’t loose
—all injector plugs were secure
—trigger points connector was secure
—injector grounds and ECU ground at case center line all secure
—wires to generator were secure
—12V to black/white wires from FI ground to T2 connector and 12V from T2
connector to ECU
—resistance of both temp sensors was fine
—dwell was ok and everything in the distributor looked fine
—12V to coil
—took out the ECU and verified that the plug wasn’t loose
It was pouring out and I was staring at the ECU laying there in the cargo
area and decided to take the plunge b/c Jessica showed up with one of our
spare ECU’s. I plugged it in and the motor fired right up. Just to confirm I
wasn’t hallucinating, I tried the ECU I had just removed. No start. Tried
pressing on the harness in case it was loose on the card edge. No start.
Put in the spare ECU and it fired right up again and I drove home without any
So all along my "intermittent warm idle lope" was the ECU taking a dump
until it finally died?!?! Is that even a thing??
Well, I don't know if it's a sign of a dieing ECU, but it certainly sounds
like it's possible. At least having a spare ECU to put in and get the home
helped. I guess you'd have to try the replacement ECU for a couple of days
to know for sure.
Bob 65 Notch S with Sunroof
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