[Shotimes] Using a lot of fuel and running rough

[Kevin & Cheryl Airth]

David:
 Everything except the 411 code is related to what you did or did not do
during the test. The 411 is interesting. Never had anybody ask about this
one!

411 is saying the IAB can not control the idle but you said you already
replaced it. Did you clear the codes and let the engine relearn it's idle
after that?
Has the car had the 100K service? I think you might have oil in the plug
wells and/or old wires/plugs causing some misfires. Have you drove another
SHO to see how the power compares with yours?
.
.



> Hi all.  Hope someone can help so I don't have to spend a ton of money
> again.  My '93 3.2L ATX has been running rough lately.  A while ago it
> wouldn't stay running and I replaced the IAB valve on it.  That sort of
> fixed the cold running but it still does it occasionally.  Also, it's been
> running really rough and is getting horrible gas mileage (used to be
around
> 20, now down to about 14).  I ran the codes and got the following:
> 129- Insufficient MAF change during dynamic response test
> 167- Insufficient throttle position change during dynamic response test
> 536- Brake on/off circuit failure/not activated
> 521- Power steering pressure sensor/switch did not change
> 632- Transmission control switch circuit did not change state
> 411- Can't control RPM during low RPM check (the car stalled during the
> test)
> David D. Duffield
> 1993 Green SHO
> 3.2L  110,000
> ATX