Question about 2002 Chevrolet TrailBlazer

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How can you tell which 02 censor is bad?

Can has a rough idol. but runs normal while in a higher speed

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  • Chevrolet Master
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What are the codes coming up. if you have a bad o2 sensor it will come bank 1 or bank 2. there can other things wrong . when was the last tune up. I like would to know what codes please

Posted on Nov 04, 2012

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Posted on Jan 02, 2017

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greg_margo
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SOURCE: Cobalt not running at low rpm.......

All are possibilities but EGR valve makes the most sense. It's famous for causing poor idling and/or stalling at low RPMS. Best of luck.
Greg

Posted on Jun 18, 2009

  • 580 Answers

SOURCE: 4.3 liter engine, got bad gas, fuel pump went out,

Are you sure it's bad gas causing the problem? It could be a faulty idle sensor or more than likely the coolant sensor near the thermostat housing malfunctioning. It could be sending the wrong signal to the pcm(power control module) causing the timing to be too far advanced thus causing the low speed chugging & hard starting. Good luck!

Posted on Apr 17, 2010

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1 Answer

1992 ford 350,460 engine runs really roughly and shakes at idol up to about 20 30 mph clears up at higher speed?


Theres a vacuum leak..chec hoses..gaskets..seals..its oldcar there worn..probly need a rebuild.

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When the ac is on car idols normally once the ac is off car idols very roughly like it wants to stall at times this is only when the ac is off. thanks..


Idle speed is probably too low. Most cars with electronic engine management automatically increase the engine speed when idling to compensate for the extra load of the air con. Unfortunately, with this type of engine management, a lot of cars don't allow you to manually increase the engine idle speed. It has to be programmed in at a Dealers with the correct tuning equipment.

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92 NISSAN WITH BOGGING AT 2800 3500 RPM AND AT LEVEL SPEED 4CYL AND 5 SPEED


For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
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------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
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------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

-----------
Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.

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P0303, P0316


You have a misfire on #3 for code p0303 & misfire for code p0316

Apr 20, 2011 | 2002 Ford Taurus

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My Neon keeps stalling at 4k rpm. will not run


Just to let you all know it ended up being the CENSOR in the trany that was bad.

May 28, 2009 | 1997 Dodge Neon

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Idles okay, runs rough when gas applied


Either a bad MAP sensor, or TPS. What is the code for the check engine light? This will most likely tell you what it is.

May 27, 2009 | 1994 Chevrolet C1500

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Check engine light on,idols rough,fine at all other speeds.


It either has a vacuum leak or a dirty MAF. To test for vac leaks spray the engine with carb cleaner to see if the engine speed changes., if it does you fond the leak. The most common leak is pcv line coming straight off the back of the throttle body. Check there first. Also check to make sure there are no air leaks between the throttle body and the mass air flow. Don't replace the idle speed motor or the tps, they won't fix it. It is possible the o2 is the problem, but it usually isn't. P0107 Is usually always from the stuff i listed above.

Mar 01, 2009 | 2000 Ford Escort

2 Answers

Check engine light on,idols rough,fine at all other speeds.


I decided to check the idol air control valve,when I removed it I found the problem right behind it. The P C V valve hose was just about into where it fastens to the intake,the other end was bad also. Cost me aout $6.00 Where auto parts stores were telling me parts would cost two or three hundred $$.

Jan 20, 2009 | 2001 Ford Escort ZX2

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