LAST UPDATE: It's fixed, it was the idle air controler valve. Runs Great! Thanks 2004 Aveo, I replaced the plugs, valve cover and tube gaskets, new plug wires, new air cleaner and the engine runs great, but dies at idle. WHY? Could this be a bad Idle air speed controller valve? Would the car run great and just die at idle like this if the control valve was bad? On the cam cover where the PVC? valve and hose screws on to the cam cover, just next to this PVC fitting screw fitting is what looks like a fitting for a very small vacuum hose, but there is no hose around that is missing, so maybe this is just a vent? Anyone know? One last question, what is a good cheep code scanner for this car and where can I buy one? and a manual for the codes? Thank You coinslots.com
2004 aveo will not idle, but once or twice it did. on 2004 Chevrolet Aveo
by coinslots in Seattle, WA on January 30, 2010
4 answers 3 comments
ANSWER by patrick mannion , January 31, 2010
I suspect a vacuum leak is causing the car to stall. if the car does stall it should set a trouble code bringing on a CHECK ENGINE LIGHT. No modern car (1969 onward) sold in the US vents anything to the atmosphere so you should have no vent at the valve cover. Perhaps you can find a service manual on line Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info .There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You get a one year subscription to year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual. http://bit.ly/alldata_repair_manuals or try http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription. As far as a good but inexpensive scan tool look at the eqquis line of scan tools.
ANSWER by Bret Bodas , January 31, 2010
Did the idle problem exist before you did the work or after? Any parts store will have an inexpensive scanner if you just want to read codes, so it depends on how much you want to spend and what features you want. The ability to read frozen data at the time the code is stored is good, as well as being able to read live data. A google search on any code will get you basic information, however if you want diagnostic info, you'll need a good repair manual. You might find a free repair manual here: http://bit.ly/autozone_repair_info or go to http://bit.ly/alldata_repair_manuals or http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription.
COMMENT by coinslots , January 31, 2010
Update to the Update, now for the first time the idle is getting sporadic, rpm's up and down, this has to be the idle air speed controller valve, I ordered one today, will post results. Coinslots Update to this problem, and "least I not forget" thank you very much for you help on this. Now, update: it's intermittent. Problem started the day before this cars first, tune up in 155,000 miles! Yes 155,000 and the repairs were needed because the tube seals failed, and two plugs started filling with oil shorting plugs making it run rough and then the idle problem occurred the day before repairs were made. Now, the car runs great and the check engine light is off, and stays off. But the car might idle OK for 3/4 of a day and then for no reason it will not idle it will just drop dead at each stop. Maybe in 15 minutes or a unknown time, it will start idling fine again. Even while the problem is occurring the check engine light stays off. So I am thinking maybe a bad wire conection?, corroded plug on the idle air speed controller valve? While changing the tube sealy or cam cover gaskets I did have to remove, "unplug" that wire that goes into the engine between and behind the cam gears so I could remove the cam cover. Does this wire Tye in to the idle air speed controller valve?, as maybe this plug needs cleaning? Car runs great now, just this idle problem that will pop up at any given time and last for a bit, and go away later? Being the check engine light is off and stays off during these whole events, would there still be information that could help, from a scanner reading? My feeling is something is breaking connection with this idle air gadget. Could breaking the battery connection and maybe rebooting the computer help? Thanks again for the great ideas and help! Sincerely Coinslots.com
COMMENT by Visitor , November 05, 2010
I HAVE A 04. THERE IS A SWITCH SENOR MOUNTED ON THE TOP OF THE INTAKE. THERE IS A VACUM HOSE SMALL HARD PLASTIC HOSE WITH A RUBBER 90 AT BOTH ENDS ONE END PLUGS INTO THE SWITCH THE OTHER END PLUGS INTP THE INTAKE ON THE PASSENGERSIDE. THE ELBOW THAT PLUGS INTO THE SWITCH OR SENOR ROTTED AND WAS SUCKING AIR DOING THE SAMETHING YOU DESCRIBED. I WENT TO AUTO ZONE THE EMISSIONS RACK NEAR THE OIL FILTERS AND BOUGHT A 4 OR 5 PACK OF DIFFERENT SIZE 90 RUBBER FITTINGS $5 REPLACED THE ELBOW AND IT WAS CURED. NI ALSO LIKE YOU CHANGED THE PLUGS THE HOLES WERE FULL OF OIL ALSO SO I NEED TO CHANGE VALVE COVER SPARKWELL SEALS. WAS IT A BIG PAIN IN THE ASS CHANGING THE VALVE COVER GASKET AND GROMMETS.
COMMENT by Visitor , February 21, 2011
what was the hard part?
ANSWER by motojunky , August 18, 2012
you mite be having a clogged catalytic converter problem. do a system check by following the exhaust system from the manifold to the rear tailpipe. there will be connecting joints through the system. simply unbolt one at a time starting from the catalytic converter and separate the exhaust pipe and then start vehicle. if it starts and idles fine then bolt back the system and repeat process for the remaining junctions till you reach the point where the vehicle will not idle. once you reach that point the problem lies in that area. good luck.
ANSWER by Visitor , November 05, 2010
I HAVE A 04 AND HAVE THE SAME VENT WITH NO HOSE ATTACHED. I HAVE HAD THE HEAD REMOVED BECAUSE OF A BENT VALVE PROBLEM AND THOUGHT THE MECHANIC DID NOT REATTACH IT BUT AFTER LOOKING I CANNOT FIND A LOOSE HOSE ANYWHERE NEAR IT. WAS LOOKING ON HERE FOR THE ANSWER. THE ELECTRICAL SENOR MOUNTED ON THE TOP OF THE INTAKE HAS A VACUM HOSE MY RUBBER ELBOW WAS ROTTED IT WILL CAUSE THE VEHICLE NOT TO IDLE. BOUGHT A ASSORTMENT AT AUTO ZONE OF RUBBER ELBOWS FOR $5 IT FIXED IT