@Bhertz01 ;
With those kind of symptoms, you should have some DTC's - stored or otherwise.
Do you have an OBD-II scanner, or, have you tried the key dance?
Engine revs at random times (4.7 v8)
Engine revs to 2000 rpm at startup and fluctuates from 1250 - 2100 randomly (2007 Commander 4.7 4wd). Dealer has no idea and there are no present codes.
The problem seems to be worse when it is colder (I'm in KC).
Has anyone else had this issue? Is it a sensor or a trottle body problem?
The problem seems to be worse when it is colder (I'm in KC).
Has anyone else had this issue? Is it a sensor or a trottle body problem?
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With those kind of symptoms, you should have some DTC's - stored or otherwise.
Do you have an OBD-II scanner, or, have you tried the key dance?
No stored DTCs - I have checked multiple times. What is the key dance?@Bhertz01 ;
With those kind of symptoms, you should have some DTC's - stored or otherwise.
Do you have an OBD-II scanner, or, have you tried the key dance?
The Key dance is performed by turning the ignition switch on/off 3 times quickly - On the 3rd cycle, you keep it in the ON position - DO NOT turn it off on the 3rd cycle.No stored DTCs - I have checked multiple times. What is the key dance?
Any current or stored DTC's will be displayed in the EVIC. (Electronic Vehicle Information Center)
The only code that is pending is P0441The Key dance is performed by turning the ignition switch on/off 3 times quickly - On the 3rd cycle, you keep it in the ON position - DO NOT turn it off on the 3rd cycle.
Any current or stored DTC's will be displayed in the EVIC. (Electronic Vehicle Information Center)
Based on your symptoms that DTC makes some sense.The only code that is pending is P0441
P0441 Evaporative Emission Control System Incorrect Purge Flow
What does that mean?
This indicates that a part of the EVAP control system is no longer functioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
EVAP emission canister purge is controlled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.
Causes:
Bad vacuum switch
Broken or damaged EVAP line or canister
Open in PCM purge command circuit
Open or short in Voltage feed circuit to Purge Solenoid
Faulty purge solenoid
Restriction in EVAP solenoid, line or canister
Corrosion or resistance in purge connector
Bad PCM
Possible Solutions:
With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Common Chrysler fix - Replace Leak Detection Pump / LDP
Repair damaged EVAP lines or canister
Repair open or short in voltage feed circuit to Purge Solenoid
Repair open in PCM purge command circuit
Replace purge Solenoid
Replace vacuum switch
Repair restriction in Evap line or canister or solenoid
Repair resistance in purge connector
Replace PCM
OBD-II Trouble Code: P0441 Evaporative Emission Control System Incorrect Purge Flow (obd-codes.com)
This may sound silly to you @Bhertz01 , but, the very first thing I would try, is replacing your gas cap with a brand new, factory OEM gas cap.
Replaced it yesterday (2nd cap I've tried) no change. Is the purge solenoid the one that is supposed to be mounted near the fuse box? The mount is broken and it's just hanging by the hoses & connections.Based on your symptoms that DTC makes some sense.
P0441 Evaporative Emission Control System Incorrect Purge Flow
What does that mean?
This indicates that a part of the EVAP control system is no longer functioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
EVAP emission canister purge is controlled by a valve which allows engine vacuum to pull stored fuel vapors from fuel tank into the engine to be burned, rather than be vented to atmosphere. A vacuum switch is used to detect when flow exists. If the PCM commands purge and sees that the switch is closed (indicating no detected purge flow) P0441 is set.
Causes:
Bad vacuum switch
Broken or damaged EVAP line or canister
Open in PCM purge command circuit
Open or short in Voltage feed circuit to Purge Solenoid
Faulty purge solenoid
Restriction in EVAP solenoid, line or canister
Corrosion or resistance in purge connector
Bad PCM
Possible Solutions:
With a P0441 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Common Chrysler fix - Replace Leak Detection Pump / LDP
Repair damaged EVAP lines or canister
Repair open or short in voltage feed circuit to Purge Solenoid
Repair open in PCM purge command circuit
Replace purge Solenoid
Replace vacuum switch
Repair restriction in Evap line or canister or solenoid
Repair resistance in purge connector
Replace PCM
OBD-II Trouble Code: P0441 Evaporative Emission Control System Incorrect Purge Flow (obd-codes.com)
This may sound silly to you @Bhertz01 , but, the very first thing I would try, is replacing your gas cap with a brand new, factory OEM gas cap.
may get some vice grips and start pinching lines to see if there is a leak somewhere that you cannot see. those lines go around behind the throttle body and are part of the cruise control if I recall. may have a small split somewhere along the way... or spray a little starter fluid around the lines to see if the revs change something to see if there is a leak. it sounds more deliberate (in something is switching to cause the issue) but may eliminate a leak somewhere
The cruise works perfectly, an I describing a evap part or a cruise control part?may get some vice grips and start pinching lines to see if there is a leak somewhere that you cannot see. those lines go around behind the throttle body and are part of the cruise control if I recall. may have a small split somewhere along the way... or spray a little starter fluid around the lines to see if the revs change something to see if there is a leak. it sounds more deliberate (in something is switching to cause the issue) but may eliminate a leak somewhere
they are connected! follow the hose around and you will see there is a "t" or two and the lines connect to the cruise "pot"..
One last thing..... the symptoms are always worse when the temperature outside is below 32 degrees..they are connected! follow the hose around and you will see there is a "t" or two and the lines connect to the cruise "pot"..
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