What is year--make--model?
How long since a tune-up? Any applicable trouble codes? Some of the national brand auto stores will check codes for free. I always check for codes, don't care if the cel is on or not.
Some makes and models, if you turn on the ac, the pcm will try to up the idle, so as not to cause idle issues.
Clean the throttle body, check and clean idle air system, see if it helps?
SOURCE: Check engine light comes on. p0171 and p0351 codes found
From Lusty Kid:
I know the economy is bad, but change all of the plugs. Check your PCV Valve hose, 150 rottens them out allowing air to be sucked in, thus all kinds of codes.
Depending on mileage. Dismount the EGR valve and clean passages. If you are really good dismount the throtle position sensor body and clean out passages with Choke Cleaner., dismount where the EGR valves connects to the engine, clean out passages. Also check the hose thats behind this mounting to ensure is not clogged. If clogged clean it out. If not replace it. Is about 1.5 ft. long, connects to the PCV Valve Hose.
When is the last time you change your harness. Can't remember??? Replace it. Good Luck
SOURCE: car dies when heater turned on
Assuming your charging system is working properly-You probably have an idle speed control problem. Behind the battery there is an over voltage relay with red top and a 10 amp fuse in it. This relay powers the a.b.s. and the idle speed control unit. Make sure fuse is o,k, and that the relay is not corroded. Next there is 2 micro switches on the throttle linkage(you will have to remove the air cleaner. This switches are tested with an ohm meter and show continuity in one position and open in the other(don't worry if the ohm reading is high).Next to the over voltage relay there is 2 black relays(one fuel pump the other is climate comtrol) The one that says klima is the climate control. Make sure it is not corroded and a lot of times the electrical connector gets bowed and you will lose contact. This relay is really more of a control unit and gives input to the idle and c.i.s. control units as far as the a/c and heater operation. Hopefully I have been helpful
SOURCE: Error codes P0301(cylinder #1 misfire)
The ECM is very possible.I assume cylinder 4 injector is providing gas?The connection for cylinder 1 is probably a connector with pins correct?If you can bypass the ECM,that would get you closer if not give the answer.I would try using a wire straight from the battery to the injector electric somehow without damaging the wires.For years,if i had an extension cord which was old,I cut off the ends and save it just for troubleshooting occasions like this is a good example.If you do the bypass,try to hold the wire with something other than skin.I have leather gardening gloves,pliers.The gloves are better for steadiness and pliers are metal.It is not likely that it should melt but doing electrical work for so many years,an ounce of prevention is worth way way more than a pound of cure.If it did melt,it would stick and probably a couple weeks worth of pain.I would like to know how you make out.If you reply back to this post I will get an autolink to your post.Good luck! Greg
P.S.Was your error code from the car's own system and not a shop?I am trying to figure out what year that system started.
Thanks
SOURCE: cooling fans do not work.Replaced relay. Turn ac
Keep in mind that if the fan doesn't run with the engine running and the A/C its ON position, bad fan or sensor or relay. Then, its possible that you have any problem with the Air Conditioning Thermostatic Expansion Valve Replacement, not wth the fans relay or motor.
The service procedure for replacing the expansion valve on the Corvette is outlined below. This procedure is more detailed and supercedes the one listed on page of the Chassis Service Manual.
1. Purge system of refrigerent.
2. Drain cooling system and remove radiator supply tank.
3. Disconnect heater hoses from heater core.
4. Disconnect power element bulb.
5. Remove expansion valve hold down strap.
6. Remove equalizer line from suction throttling valve.
7. Disconnect expansion valve inlet and outlet connections and remove valve.
8. Install new thermostatic expansion valve by reversing removal procedure.
9. Evacuate and charge system.
Test it and tell us news.
SOURCE: I own a 2006 impala
http://www.automotiveforums.com/t706310-code_p0481.html
I read over the p0481 code, and someone else had a problem with this circuit in a 2003 Impala.
OK, if replacing the relay and fan motors and checked fuses and replaced coolant temperature sensor, there isn't much left to check but the harness which means that a wire could be crossed or open to the circuit causing an immediate code to come back on after clearing it.
Maybe, if it's too hard to trace yourself ( wiring can be like tracing a break in spaghetti), then try to take it to an auto electric shop to have them chase the wire for you that is bad or crossed.
If the scanner communicates with the ECU/PCM then it's likely it's ok. But, I've seen some ECU/PCM units with partial functionality with fuel injectors, not firing, for instance.
Good luck on this repair.
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