Check engine light + THUMP??
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New User
Joined: Jun 2009
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Check engine light + THUMP??
Today my check engine light came on and the car was making a thump thump sound that sounded like it came from under my seat. It also felt like it was lagging.
I checked and was really low on oil, so I added 2 quarts. The thump is gone. The lag is gone.
Do you think that was it?
I checked and was really low on oil, so I added 2 quarts. The thump is gone. The lag is gone.
Do you think that was it?
New User
Joined: Aug 2009
Posts: 1
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My Escape engine light did not come on and it made the same noise. I was on the turnpike and by the time I got it off the road and into a parking lot, the noise had changed to a loud clank and rattle. There was no oil in it. I just got it towed and am looking for a reason. Make sure to keep an eye on that oil. Don't depend on your light and don't ignore it. I'm probably looking at big money. Can't find an engine. Any idea's?
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Posting Guru
Joined: Feb 2002
Posts: 1,534
Likes: 2
From: Warren, MI
That's the first time I've ever heard that disconnecting the battery doesn't erase codes plus any learned strategies! That's why it's required after replacing some parts.
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Cross-Country
Joined: Sep 2002
Posts: 61
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From: Gaithersburg
I may be wrong, but I believe the codes are stored in firmware, unaffected by battery power. Could you give me the web site showing that disconnecting the battery works?
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
All codes, ones that trigger a CEL or not are stored in KAM, or Keep Alive Memory. KAM memory stays stored as long as the battery is connected. Disconnect the battery for a few minutes, and plug it back in, as far as the computer is concerned, its in a brand new vehicle.
Not just codes are stored in KAM, but learned sensor ranges as well. Every sensor is different, and the computer needs to be able to accommodate for the various tolerances a sensor will have. That is why say if you have a code for say Coolant Temp sensor, and replace the sensor without disconnecting the battery, the code may still be there, because even though you replaced the sensor, the operating ranges of the new sensor may not be exactly the same as the old one.
Not just codes are stored in KAM, but learned sensor ranges as well. Every sensor is different, and the computer needs to be able to accommodate for the various tolerances a sensor will have. That is why say if you have a code for say Coolant Temp sensor, and replace the sensor without disconnecting the battery, the code may still be there, because even though you replaced the sensor, the operating ranges of the new sensor may not be exactly the same as the old one.
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
You need to find the cause of the oil lose ASAP, or $$$$$ will be soon.
Check your PCV it may require replacement, engine not breathing and building too much crankcase pressure, forcing oil out seals and/or into induction circuit.
Check your PCV it may require replacement, engine not breathing and building too much crankcase pressure, forcing oil out seals and/or into induction circuit.
Posting Guru
Joined: Feb 2002
Posts: 1,534
Likes: 2
From: Warren, MI
All codes, ones that trigger a CEL or not are stored in KAM, or Keep Alive Memory. KAM memory stays stored as long as the battery is connected. Disconnect the battery for a few minutes, and plug it back in, as far as the computer is concerned, its in a brand new vehicle.
Not just codes are stored in KAM, but learned sensor ranges as well. Every sensor is different, and the computer needs to be able to accommodate for the various tolerances a sensor will have. That is why say if you have a code for say Coolant Temp sensor, and replace the sensor without disconnecting the battery, the code may still be there, because even though you replaced the sensor, the operating ranges of the new sensor may not be exactly the same as the old one.
Not just codes are stored in KAM, but learned sensor ranges as well. Every sensor is different, and the computer needs to be able to accommodate for the various tolerances a sensor will have. That is why say if you have a code for say Coolant Temp sensor, and replace the sensor without disconnecting the battery, the code may still be there, because even though you replaced the sensor, the operating ranges of the new sensor may not be exactly the same as the old one.
The software stores a permanent DTC in non-volatile random access memory (NVRAM) whenever a DTC is set and the malfunction indicator lamp (MIL) has been illuminated. Permanent DTCs can only be cleared by the module strategy itself. After a permanent DTC is stored, three consecutive test passed monitoring cycles must complete before the permanent DTC can be erased. The PCM clears the permanent DTCs after one monitoring cycle if a request to clear DTCs is sent by the scan tool and the test subsequently runs and passes. A permanent DTC cannot be erased by clearing the keep alive memory (KAM). The intended use of the permanent DTC is to prevent vehicles from passing an in-use inspection simply by disconnecting the battery or clearing the DTCs with a scan tool prior to the inspection. The presence of the permanent DTCs at an inspection without the MIL illuminated is an indication that a correct repair was not verified by the on-board monitoring system.
So "some" DTCs can't be cleared by disconnecting the battery or even a scantool!
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
The PERMANENT DTC's are the READY monitors which must perform good preset drive cycles before they are extinguished.
The MIL DTC's can and will be erased by scantools and battery disconnection.
Posting Guru
Joined: Feb 2002
Posts: 1,534
Likes: 2
From: Warren, MI
Better reread that first sentence in that paragraph as it doesn't state that. I've actually never heard the term "Permanent DTC" before reading this! I don't think that Readiness Monitors light the CEL. They require a drive cycle to clear, normally after the battery has been disconnected.
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