Question about 1996 Pontiac Grand Am

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Erratic RPM-Moves BUT slow-Wants to die

Replaced both O2 sensors and Catalyic Converter-Drives just fine for 5 miles or so,the it sits (overnight this time),then start up in morning,RPM is varying from 1100 down to 900 with surges up to 16,000-when I put it in drive,it goes slow wants to die.

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  • rr01453 Mar 19, 2009

    According to computer analysis-Every thing checks out-no problems reported BUT erratic RPM still persists on cold startups

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Sounds like fuel dilivery problem, try a new fuel filter, if that don't help, or it is not an issue, do a fuel pressure test to see if you got the right p.s.i. from pump.

Posted on Feb 11, 2009

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1 Answer

Why the problem with 02 sensor slow during catalyst monitor


Worn out Converter
Worn out O2 Sensors


Oxygen Sensors get replaced when they fail
& if they don't, you replace at 100,000 miles,
as they slow down (switching times)

They won't switch much, if their is little oxygen in
a failed converter,13 years, it's done

Aug 05, 2014 | 2001 Dodge Ram 1500 Truck 2WD

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O2 bank 2 sensor 2 replacement


It's on the driver side by the catalyic converter.

May 25, 2013 | 2010 Lexus ES 350

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I plug in a de-coder. It says, "P0133"


P0133 is a 'lazy' O2 sensor, bank one, side one-it is on the same side as number one cylinder and is in front (upstream) the catalytic converter. O2 sensors get 'lazy' or switch slowly as they get older die to deposits building on the tips or dirt around the outside of the sensor. On a scanner that does real time monitoring, you should see that it is switching between higher readings (.8-.9 volts) and lower readings (.1-.2 volts)-it is expected to perform these 'switches' at a certain rate and if the ECU (brainbox) determines that it is under-reporting, it sets the code. As a rule of thumb, an upstream O2 sensor should be replaced at 100,000 miles. This will assure better overall performance as the O2 sensors ability to monitor the engine is critical.

Dec 24, 2010 | 1996 Plymouth Voyager

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Where is the o2 sensor and how do you change it


On the exhaust manifold. Put some type of rust buster on it and let it sit overnight before trying to break it loose. There may be a second O2 sensor after the catalytic converter.

Sep 09, 2010 | 1996 Chevrolet Cavalier

2 Answers

What the sytoms of a clogged catalic converter?


Classic symptoms of a plugged catalytic converter. You may also have a check engine light, with these codes:

P0160 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0162 O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
P0163 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
P0164 O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
P0165 O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)
P0166 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
P0167 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 3)

or simply:

P1484 Catalytic Converter Overheat Detected A catalyst overheat condition has been detected by the catalyst temperature sensor

With the symptoms you are describing though, 99% sure that will be it.

Many times a "clogged" catalytic converter is actually a broken one. Inside the unit, there is a honeycomb-like structure that aids the converter in superheating the exhaust fumes, which cuts down significantly on emissions. Over time, this honeycomb structure can get brittle and crack or chunk off inside the unit, which will impede the flow of exhaust. For this reason, many times a clogged or broken catalytic converter will rattle or make vibrating noises when the engine is given gas.

Jun 01, 2010 | 1998 Chevrolet Blazer

1 Answer

Eratic Ideling and Wants to die, Backfire through Intake.


I also have 2001 S10, 4.3 V6 Engine code W, 4x4, Automatic, 137,000 miles. About 3 weeks ago, I had intake manifold gasket changed and every since then has been doing the same as yours. I suspected that the yahoo who did the gasket change got the distributor in wrong. I had one other mechanic tell me my engine was shot but the distributor , firing order was all right. Then I had another mechanic tell me that the distributor was in wrong and they fixed it but it didn't run any better. They also said the catalytic converter was plugged causing back pressure in engine. This past weekend I cut the catalytic converters (2 of them) off at the y pipe and now the engine will actually idle but still a little rough (and loud) but now the O2 sensors are not able to do their job. They say catalytic converters are only good for about 10 yrs anyway. To get the one piece replacement cats pipe in you have to drop the tranny crossmember, and to drop that it looks like you have to remove the torsion bars or at least one.

Hope this helps.
Wally

Mar 01, 2010 | 2001 Chevrolet S-10

3 Answers

When i step on the gas in my 2000 echo the car totaly dies out for a few seconds then starts to pick up rpm


i had the same problem, is the check engine light on?mine was ,i replaced an air sensor, it think it was between the muffler and cateletic converter or monifold.

paul

Mar 03, 2009 | 2000 Toyota ECHO

1 Answer

Trac light on no power at acceleration


you might need a new catalyic converter
if not i would suggest that you get your sensor checked
these can be a problem the sensor thinks the wheel is slipping and cuts the torque and power down this could be what is happening
also could because of airflow control with the catalyic converter

Nov 28, 2008 | 2004 Chevrolet Cavalier

2 Answers

2004 Chevy Cavalier 4 cylinder Engine Surge


i would tell the dealer u want a second opion bescause my 2004 cavlier idles sometimes high it it turned out to be the rpm were wrong

Nov 22, 2008 | 2004 Chevrolet Cavalier

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