Question about 2003 Pontiac Montana

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DTC PO300 and PO506 engine won't idle when cold

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  • Pontiac Master
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Change the spark plugs, then clean out the throttle body and IAC passage (after you removed IAC). Clean the tip of IAC being careful not to get any throttle body spray on anything, except the black tip or you ruined the IAC! By the way, do you have any codes?

Posted on Jan 26, 2015

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  • Master
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Hi p0300 is misfire and p0506 is idle control system low check the idle speed sensor take it out and clean it install and try if works P0506 could bring out P0300 do this and check if you don't have to replace the Idle speed sensor good luck

Posted on Sep 04, 2009

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  • Master
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These are the definitions for the codes you've listed.
P0300 Random/multiple cylinder misfire detected.
P0506 idle control system rpm lower than expected. I am assuming that the P0506 is happening due to the P0300. If this P0300 was P0301-302-303 etc it would be easier to detect the actual problem. This misfire could be caused by any number of things- bad coils, bad injectors, bad fuel rail, plug wires, ecm...

Posted on Sep 04, 2009

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  • Pontiac Master
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CODE PO300 MULTIPLE ENGINE MISFIRE DETECTED CONDITIONS. CODE PO506 IDLE SPEED TOO LOW CONDITIONS.LOOKS LIKE THE IDLE SPEED CONTROL IS NOT WORKING.

Posted on Sep 04, 2009

  • Jonah Oneal Sep 06, 2009

    SCAN IT CHECK THE MASS AIR FLOW SENSOR TO SEE IF ITS CONTAMINATED CAUSING LEAN CONDITIONS.LOOK FOR BAD COIL.ALSO CHECK FOR VACUUM LEAKS.AT THE PVC VALVE.ALSO SCAN IT TO MAKE SURE EGR VALVE NOT STUCK OPEN.

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I don't have a solution but I can tell my story on code P0300. What I have replaced so far that did not fix the misfire problems are 1. EGR valve, 2. throttle position sensor, 3. Idol air control valve, 4. The rear crank position sensor, 5. the control module under the coil packs, and 6. the fuel filter. So far it seems to run a little better when I unplug the EGR valve but that is only temporary. I still have the stumbling random misfire but not all the time. It comes and goes. Currently it will run smooth and strong for a while, maybe 10 miles or so, then it just looses power. When I back off the gas it smooths out a bit then as I accelerate again it misfires all over the place with the tach jumping up and down. It will do this sometimes for a few seconds to a few minutes then smooth out and run strong and smooth again. The a mile or so down the road it will misfire again all over again. Sometimes it goes for 30 miles without a misfire at all. I have to question how the cat could cause this issue as mentioned in the list of possible causes.

Posted on Apr 24, 2012

  • jrodswift Jan 26, 2015

    a bad cat might cause it but when the cats go they often let off a rotten egg smell.

  • jrodswift Jan 26, 2015

    it might be bad fuel try changing to a high octae fuel see if that works

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Related Questions:

1 Answer

Check engine light


Thermostat failure, random misfires detected, idle control errors. Severe vehicle overheat condition could set po300 and po506. Recommend replace tstat and seal , clear codes and recheck.

Jan 10, 2014 | 2005 Chevrolet Colorado

2 Answers

Code po506 is showing up what does this mean


P0506 - Idle Air Control System RPM Lower Than Expected
This P0506 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.

Potential Symptoms: Most likely the only thing you'll notice is the idle speed is lower than normal so it will likely be rougher. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

Causes: A P0506 DTC trouble code may be caused by one or more of the following:
A vacuum leak
An air restriction in the intake air path or exhuast
A faulty positive crankcase ventilation (PCV) valve
Damaged/failed/dirty throttle body
Internal engine problem
Failed PCM

Possible Solutions: This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.

Other related DTCs: P0507

Hope helps.

Jun 14, 2011 | 2003 Nissan Maxima

1 Answer

2003 1500hd chevy silverado 6.0 liter. I had a



DTC Number
P0160 DTC Name O2 Sensor Circuit No Activity Detected Bank 2 Sensor DTC Number P0300 DTC Name Random/Multiple Cylinder Misfire Detected

Feb 17, 2010 | 2003 Chevrolet Silverado 1500

2 Answers

97 toy corolla DTC po300 po301 po401 po402


po300 random/multiple cylinder misfire detected po301 cylinder 1misfire detected po401egr flow insufficient po 402egr flow excessive

Feb 11, 2010 | 1997 Toyota Corolla

3 Answers

Engine line on; a little rattle when driving


There could be a hundred causes for a check engine light. First step is to hook up a computer scan tool and see what codes the computer has. The next step depends on the codes.

Feb 04, 2010 | 1997 Toyota Corolla

1 Answer

I have po300 and po506 on my canyon code cleared and resets after a while


From http://www.obd-codes.com/trouble_codes/
The P0300 is a misfire and P0506 indicates low RPM at idle.

A misfire can be caused by poor ignition (spark plug, plug wire, coil, ignition module/engine control module).
OR
Poor air/fuel (air filter, fuel injector, fuel pressure, fuel filter, fuel pump, bad gas, or engine control module).

Check your maintenance requirements and see if any of these items are due for replacement first.

Jan 06, 2010 | 2005 GMC Canyon

2 Answers

IDLE CONTROL SYSTEM CODE PO506


You need the idle control solenoid replaced. It is the dealer that will fix it for you.

Good luck.

Jan 02, 2010 | 2005 GMC Canyon

2 Answers

Code po506 shows up how do i fix it


This P0506 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.
Causes:
A P0506 DTC trouble code may be caused by one or more of the following:
· A vacuum leak
· An air restriction in the intake
·
· air path or exhaust
· A faulty positive crankcase ventilation (PCV) valve
· Damaged/failed/dirty throttle body
· Internal engine problem
· Failed PCM

This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns

Nov 21, 2009 | 2004 GMC Canyon

1 Answer

DTC P0300, P0302, P0171, PO506


hey man i have the same problem... did you fix it.. i need help please email me at carlos_42611@yahoo.com if you have any info!

Mar 15, 2009 | 2004 Mazda RX-8

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