Pat,
Your symptoms sound similar to the problem I was having earlier this
summer. Don't know if u remember my posts. The car would run fine for
around 2 minutes (or less) on a completely cold start. The it would slowly
die and stall. After that, I couldn't get the damn thing to even start.
I did similar diagnosis as u. When I unplugged the DPR before starting
the car cold, it would drive fine, relatively, and pull good. It would also
make it past the 2 minute stall point. Like u, I knew the DPR received
several signals, so I started to pinpoint which signal was the crap one.
Since the O2 is the main signal, I started there.
With the DPR PLUGGED IN I unplugged the O2 completely and started the car
cold. No problems. Car ran fine. It was a bit sluggish, but had good
power and didn't stall. Started the car cold w/ DPR PLUGGED IN and O2
PLUGGED IN and it died around 2 minutes.
I replaced the O2 with the OE sensor, the one including the full wiring
harness. I don't remember the specifics on your O2, but u might want to
spend the $$ and get the OE one (BTW, u can get them for $100 at
Autozone...much cheaper than any aftermarket place and the dealer, of
course). The splicing can mess up the signal.
The car runs like a champ now. Every time I get in, she starts and runs
w/out any stalling.
Just some insight from my experience. Your situation sounds similar, so
it might be something to consider.
HTH,
Renard
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Patrick Austin
Sent: Wednesday, August 22, 2001 6:36 PM
To: [email protected]
Subject: Going insane: car still runs like crap.
OK...revised list of what's going on:
Car makes fine power RIGHT after startup, for maybe 15-25 seconds or until
the car is warm (when starting from cold). After that 15-25 seconds, it
has absolutely no power. None at all.
If I unplug the DPR, the car runs like a champ. It pulls to redline. This
makes me think that it's not a fuel pump issue, as it's getting enough fuel
to make lots of power up at high RPM when the DPR is unplugged. Also, it
seems to run just as bad with a full tank of gas as with a near-empty one.
If I unplug the air mass sensor (other side of airbox from DPR) and the O2
sensor, this has no effect whatsoever on how the car runs, with or without
the DPR.
The DPR is BRAND NEW. It was doing this very same thing before the DPR was
replaced. However, immediately after replacement, the car didn't have this
problem. So something they did cured it very temporarily. About three
days. It sat for two weeks before I picked it up...maybe the cure had
something to do with sitting around a long time?
I thought it might be the TT chip I installed, but I just re-installed the
stock one, and it made no difference.
Could someone explain how a transfer pump could cause these symptoms? I'm
also curious about the time sensitivity of the running problems. Why does
it run OK immediately after startup, even if it's only turned off for a
second or two? The O2 sensor wouldn't have a chance to get cold in that
time period. A vacuum leak wouldn't cause a time-sensitive running
problem, would it?
**************
Patrick Austin
[email protected]
(617)782-9115
**************
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