Question about 2004 Chevrolet Impala

2 Answers

Check engine light on; cat codes read from machine?

Car jerks going uphills, not very fast. Read that cat coverter may be clogged? Can\'t afford to dump lots of money into it or to have someone fix my car. Help!

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  • Michael Babbitt
    Michael Babbitt Mar 19, 2014

    What is the code or codes you have set? You must first determine that all the electronic connections are good and take voltage readings for signal volts to tell a componet what to do. If all that checks out then a quick way to see if the exhaust is plugged is to pull an 02 sensor out in front ot the cat and install an Exhaust Back pressure gauge and take readings at idle, should read a max of 1.2 psi.Raise engine rpms to about 2000 RPMS. Maximum restriction is 3.0 psi @ high at this rpm. Check exhaust out for damage,such as damed pipes, smashed or bent. How many miles are on the car and are they all city driving or combination of city and highway.

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  • Chevrolet Expert
  • 1,868 Answers

Good morning! for the most part O2 sensors are contaminated due to an incorrect fuel/air mixture...They are an effect rather than a cause...symptoms of jerking up hill and not very fast would indicate a defective Throttle Positioning Sensor (TPS) or Manifold Absolute Pressure (MAP) sensor...Here is least expensive fix...Buy a can of DeOxit from radio shack...Remove and spray O2 sensors...This is a NO-Touch cleaner...Reinstall...Using a voltmeter set to read 5 volts...TPS is bolted to the throttle body and has following colored wires...Black, Gray and Dark Blue...with connector in place push two safety pins into the rear of connector on Dark Blue plus lead and Black negative lead...Start engine...At idle meter must read .08 volts...Bump idle to full... Meter must read 4.2 volts...If reading never gets higher than 2 volts...TPS is the problem...see image


Check engine light on; cat codes read from machine - 746d99a2-b003-45c3-8349-11fa4f7ef804.jpgCost $35.00

Posted on Mar 18, 2014

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  • Chevrolet Master
  • 660 Answers

A totally bad cat would result in a loud hissing sound when you accelerate.
Cat codes are not always cat, but could be the oxygen sensors. (most likely the issue)
Can you get me the trouble codes?
Example of the code is P0300 or P1429
Most auto parts stores will scan your computer for free and give you the codes.

Posted on Mar 18, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 16 Answers

SOURCE: 98 Chev Lumina LTZ

I have had the same issue..

I solved it by replacing the Manafold Air Pressure sensor, and the Mass Air Flow sensors, has not had a problem since.

The parts are fairly easy to replace yourself if you are mechanically inclined, however if you do not feel comfortable in doing this work yourself, take it to the shop.

My dad had the same issue on his Buick, and after the factory replaced coil packs, plugs and wires, they finally decided to change out the MAP sensor and that fixed it for him.

Posted on Nov 16, 2008

Remmik
  • 56 Answers

SOURCE: car is jerking engine light is flashing and smell gas

With modern cars it is bad when the engine light just comes on and the vehicle does something very different. It should not be driven. If the car is smelling of fuel and jerking it is because it's miss-firing (i.e. one or more cylinder is not getting spark but is getting fuel). This can be anything from electrical/electronic to mechanical like a broken rotor cap (as an example). The good thing, is that the light is coming on and a mechanic can check the ECU for error codes. Alternatively, you can buy or barrow one your self and check it out on your own (I think even certain auto-part stores will check it for you as long as you get in the zone;). 1996 is a good year for that since that is when OBDII started and all vehicles started using the same port to check for issues.

Posted on Feb 17, 2009

ftw1952
  • 10319 Answers

SOURCE: car jerks while sitting idle at stop light

Soujnds like your throttle positioning sensor is going bad. This is the sort of thing that happens before they go completely out.

Posted on May 23, 2009

  • 1201 Answers

SOURCE: Burning smell,check engine light-misfire, rough idle 96 cavalier

Sounds like there is a blown piston, to be sure have a compression test done on that #2 cylinder, if the reading is low, then you'll know.
A friend of mine had a 95 that did simular things only a little more,
it started smoking, dash lights flickered, etc. Finally, he had to get rid of it, the piston rod went through the engine block.

Posted on Feb 02, 2010

  • 180 Answers

SOURCE: 2005 Malibu, check engine light is on, code read

P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

Posted on Dec 03, 2010

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Maybe! Check your air filter, also go by auto zone, or O'Reilly Auto Parts, have them to check the engine code, it's free! Could be a bad oxygen flow sensor, or other sensor causing this! and you really need to fix that leak. hope this helps!

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Check the help links mentioned below:---


Car jerks while going uphill and Check engine light is ON?

http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html

-----------------


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Check engine light comes on and off, these are indication that there is some error code stored in your vehicles ECM. The engine module computer needs to be scanned. These will give the code and as per the error code the further problem can be detected and confirmed. The engine light indicator blinks or remains steady on dash when engine computer noticed any problem with any engine electrically operated components.


For more help, I suggest you to refer the help links provided below. These will let you know more about which areas to look, check, when there is engine light coming up on dash panel.

---------

Click the link below: -------


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http://whoisbyme.blogspot.in/2012/06/check-engine-light-reset-procedure.html

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http://technoanswers.blogspot.in/2012/02/check-engine-light-flashing.html

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http://whatisbyme.blogspot.in/2012/06/service-engine-soon-light-turned-off.html

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http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html

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These details will help.

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1 Answer

I drove the jeep the day before and it was fine the next say i get in and the check engine light came on and was flashing and it was idleing (shuttering) what could this be?


To confirm the exact fault,the error code stored in engine computer module has to be retrieved.
But as why check engine light came up,for that issue there are few help link with solutions to correct the issue.========
Click the link below:---
After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure? http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html
------------How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
------------Check Engine Light Reset Procedure? http://whoisbyme.blogspot.in/2012/06/check-engine-light-reset-procedure.html
------------- Check Engine Light ON? http://whoisbyme.blogspot.in/2012/06/check-engine-light-on.html
----------- Intermittent Check Engine Light? http://whoisbyme.blogspot.in/2012/06/intermittent-check-engine-light.html
---------- Service engine soon Light Turned OFF after Jump Start? http://whatisbyme.blogspot.in/2012/06/service-engine-soon-light-turned-off.html
---------- 2005 Chevy Impala: Service Vehicle Soon Warning Light? http://whoisbyme.blogspot.in/2012/06/2005-chevy-impala-service-vehicle-soon.html
--------- Malfunction Indicator Light ON http://whoisbyme.blogspot.in/2012/06/malfunction-indicator-light-on.html
--------- Car jerks while going uphill and Check engine light is ON?

http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html

------------


Toyota Camry Check engine light flashes while driving? http://schematicsdiagram.blogspot.in/2012/02/toyota-camry-check-engine-light-flashes.html
----------1999 Toyota Tacoma: Check Engine Light Read Code P0171?


http://whatisbyme.blogspot.in/2012/05/1999-toyota-tacoma-check-engine-light.html
--------
2007 Toyota Highlander Hybrid: Yellow Check Engine Light ON dash? http://whatisbyme.blogspot.in/2012/05/2007-toyota-highlander-hybrid-yellow.html

--------Check engine light with codes P2195 and P2197? http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
---------Car Runs Fine But Check Engine light is ON? http://whatisbyme.blogspot.in/2012/05/car-runs-fine-but-check-engine-light-is.html
----------After replacing throttle body the Check engine light starts blinking? http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html
---------OBD Code is cleared but check engine light will not RESET? http://schematicsdiagram.blogspot.in/2012/02/obd-code-is-cleared-but-check-engine.html
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My 01 gmc jimmy spits and sputters on take off and rpms jump around




As per your problem,the check engine light comes on due to technical problems in your car.In this case i suggest you to click the link below :----Check Engine Light On car? http://schematicsdiagram.blogspot.com/2011/06/check-engine-light-on-car.html
------------Basically the computer needs to be scanned to retrieve the error codes stored in ECM.In this issue,i suggest you to click this link:----How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html----------After scan procedure you will get P4 digit error codes.If suppose you get this error codes,then click the link below,to know more about error codes:----

Check engine light with codes P2195 and P2197?http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
---------------There are many other reasons to for check engine light coming ON,i suggest you to click this link below and go through its troubleshooting procedure:---------Car jerks while going uphill and Check engine light is ON?http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html
--------One more reason is as follows :----After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure?

http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html


---------

After replacing throttle body the Check engine light starts blinking?http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html

---------

This will help.Thanks.

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1 Answer

How to reset engine service light 2001 lincoln towncar


As per your problem,the check engine light comes on due to technical problems in your car.In this case i suggest you to click the link below :----Check Engine Light On car? http://schematicsdiagram.blogspot.com/2011/06/check-engine-light-on-car.html
------------Basically the computer needs to be scanned to retrieve the error codes stored in ECM.In this issue,i suggest you to click this link:----How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html----------After scan procedure you will get P4 digit error codes.If suppose you get this error codes,then click the link below,to know more about error codes:----

Check engine light with codes P2195 and P2197? http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
---------------There are many other reasons to for check engine light coming ON,i suggest you to click this link below and go through its troubleshooting procedure:---------Car jerks while going uphill and Check engine light is ON? http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html
--------One more reason is as follows :----After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure?

http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html


---------

After replacing throttle body the Check engine light starts blinking? http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html

---------

This details will help you.Thanks.

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1 Answer

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There is error code stored in your cars computer.It has to be scanned to retrieve the codes stored in it.I suggest you to click the help links shown below :----Check Engine Light On car? http://schematicsdiagram.blogspot.com/2011/06/check-engine-light-on-car.html
--------------After getting car washed, check engine light is ON and key less entry not working, tried reprogramming. Also car shows fuel pressure? http://schematicsdiagram.blogspot.com/2011/12/after-getting-car-washedcheck-engine.html
------------After replacing throttle body the Check engine light starts blinking? http://technoanswers.blogspot.com/2012/01/after-replacing-throttle-body-check.html
-----------How to Read Codes from Check Engine Light? http://schematicsdiagram.blogspot.com/2011/12/how-to-read-codes-from-check-engine.html
-------------Check engine light with codes P2195 and P2197? http://howtobyme.blogspot.in/2012/01/check-engine-light-with-codes-p2195-and.html
------------Car jerks while going uphill and Check engine light is ON? http://schematicsdiagram.blogspot.com/2011/12/car-jerks-while-going-uphill-and-check.html
-----------Vehicle smog test failed Due to NO MIL/check engine light? http://schematicsdiagram.blogspot.com/2011/12/vehicle-smog-test-failed-due-to-no.html
-----------This will help.Thanks.

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1 Answer

2006 Ford F150, 4x4, Triton V8, 5.4L-loses power going uphill between 50-60mph. Check engine light code of P0430. This indicates exhaust system. Where to start?


code P0420 & P0430 usually indicates a problem with catalitic coverter restriced/clogged
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