Re: "Ok, (peering around the cabin) who was it?"

[Chris Newbold <cnewbold@transarc.com>]

Rob Lloyd wrote:

> I have another problem, though, that I thought might be related. When the
> engine is cold, it has a misfire. Only for a couple of minutes. Once the
> engine has run 2-3 min, there's no problem and it runs great. It starts and
> idles just fine, but any application of the throttle drops the RPM, which

I've been having some cold-start issues with my '93 90 lately, though not
anywhere near this bad. It stumbles as soon as it fires, but then recovers
within 5-10 seconds and runs fine...

At one point in the past, a tec told me that it was probably carbon buildup
on the intake valves. I dismissed this as a typical blow-off response, but
have been unable to find any other faults so far...

> as well, but there are no "check engine" indications on the dash. Could the
> O2 sensor(s) still be bad. What's the best way to determine this?

Doubtful. The O2 sensors on the V6 are heated, but it still takes a couple
of minutes, I believe, before the ECU goes to closed loop operation and
actually listens to the sensor output.

-Chris
1993 90CS 70k miles