Cultass idle on my 3.1L

On Fri, 19 Sep 2003 14:10:57 -0500, "ixlar8" wrote:

 >This has been fdriving me nuts!
 >
 >1993 Cutlass supreme wit the 3.1L. At normal idle with the AC off, the idle
 >will swing from 800 to 100 back and forth til it stalls. I have checked the
 >PVC, O2 sensor, wiring, and pack. The IAC seems to be okay, I pilled it out
 >and cleaned it and reset it. No codes on the ODB.
 >
 >What have I missed?
 >

My 90 Cutlass with the 3.1 did the same thing. Would idle when cold but
the warmer it got the more it stalled. Would always start right back up.
Had a strong "rotten egg" smell at idle too.

After checking all the easy things (ignition, vacuum lines, fuel pressure),
I pulled the plenum off and checked the injectors. I had one completely
dead injector and another with lower flow that the rest. Never had any
codes set.

I visited my local junkyard and got 4 injectors for $20.00 (got a couple of
extras), replaced the bad ones and now the engine runs like a champ.

Since I had one cylinder pumping only air into the exhaust the computer was
trying to compensate for all that oxygen by richening the mixture, which
caused the engine to die at idle.


Good Luck,


Dave in Columbus
 >> Stay informed about: Cultass idle on my 3.1L 

my 91 cutlass with the 3.4 does the same thing. when it is cold it runs fine
but after driving it for a bit it starts to act up. have replaced the
injectors, and the ecm.
wrote in message


 >
  > >This has been fdriving me nuts!
  > >
  > >1993 Cutlass supreme wit the 3.1L. At normal idle with the AC off, the
idle
  > >will swing from 800 to 100 back and forth til it stalls. I have checked
the
  > >PVC, O2 sensor, wiring, and pack. The IAC seems to be okay, I pilled it
out
  > >and cleaned it and reset it. No codes on the ODB.
  > >
  > >What have I missed?
  > >
 >
 > My 90 Cutlass with the 3.1 did the same thing. Would idle when cold but
 > the warmer it got the more it stalled. Would always start right back up.
 > Had a strong "rotten egg" smell at idle too.
 >
 > After checking all the easy things (ignition, vacuum lines, fuel
pressure),
 > I pulled the plenum off and checked the injectors. I had one completely
 > dead injector and another with lower flow that the rest. Never had any
 > codes set.
 >
 > I visited my local junkyard and got 4 injectors for $20.00 (got a couple
of
 > extras), replaced the bad ones and now the engine runs like a champ.
 >
 > Since I had one cylinder pumping only air into the exhaust the computer
was
 > trying to compensate for all that oxygen by richening the mixture, which
 > caused the engine to die at idle.
 >
 >
 > Good Luck,
 >
 >
 > Dave in Columbus
 >> Stay informed about: Cultass idle on my 3.1L 

My '91 has a similar symptom: when the temperature dial reaches about
120 degrees, the engine stalls and won't crank again until the temp
gauge falls. Could this be an injector problem?
 >> Stay informed about: Cultass idle on my 3.1L 

It sounds like the Crank Position Sensor.

Gary
 >> Stay informed about: Cultass idle on my 3.1L 

My Chevy Cavalier was doing that and I changed the Throttle position sensor
which on mine was located at the front end of the throttle body and it fixed
the problem. The part was about $50.00 from Schucks Auto.


"ixlar8" wrote in message

> This has been fdriving me nuts!
>
> 1993 Cutlass supreme wit the 3.1L. At normal idle with the AC off, the
idle
> will swing from 800 to 100 back and forth til it stalls. I have checked
the
> PVC, O2 sensor, wiring, and pack. The IAC seems to be okay, I pilled it
out
> and cleaned it and reset it. No codes on the ODB.
>
> What have I missed?
>
>
 >> Stay informed about: Cultass idle on my 3.1L 

On Sat, 6 Jan 2007 11:38:57 -0800, "cougercat"
wrote:

>My Chevy Cavalier was doing that and I changed the Throttle position sensor
>which on mine was located at the front end of the throttle body and it fixed
>the problem. The part was about $50.00 from Schucks Auto.
>
>
>"ixlar8" wrote in message
>
>> This has been fdriving me nuts!
>>
>> 1993 Cutlass supreme wit the 3.1L. At normal idle with the AC off, the
>idle
>> will swing from 800 to 100 back and forth til it stalls. I have checked
>the
>> PVC, O2 sensor, wiring, and pack. The IAC seems to be okay, I pilled it
>out
>> and cleaned it and reset it. No codes on the ODB.
>>
>> What have I missed?
>>
>>
>

My 91 Olds 3.1 was doing the same thing. Turned out to be two bad
injectors. Replaced them and it's running like a top.


--

Dave in Columbus
 >> Stay informed about: Cultass idle on my 3.1L 

cougercat wrote:
> My Chevy Cavalier was doing that and I changed the Throttle position sensor
> which on mine was located at the front end of the throttle body and it fixed
> the problem. The part was about $50.00 from Schucks Auto.
>
>
> "ixlar8" wrote in message
>
>> This has been fdriving me nuts!
>>
>> 1993 Cutlass supreme wit the 3.1L. At normal idle with the AC off, the
> idle
>> will swing from 800 to 100 back and forth til it stalls. I have checked
> the
>> PVC, O2 sensor, wiring, and pack. The IAC seems to be okay, I pilled it
> out
>> and cleaned it and reset it. No codes on the ODB.
>>
>> What have I missed?
>>
>>
>
>
These vehicles I believe have a idle relearn process if battery has been
disconnected or has discharged. You must have a scan tool to perform
this operation or there is a lengthy process to go through without it..
 >> Stay informed about: Cultass idle on my 3.1L