P0101 Again
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
P0101 Again
Got the P0101 code again and it seems to be associated with filling the fuel tank....why?
The last time I had this thought it was because the fuel cap broke and I was not able to tighten it down. Have replaced the cap and after filling tank I made sure cap was tight.
Drove about the same distance as last time and the Check Engine Lite illuminates.
Last time I checked and checked and checked again the air ducts from the Blackwing air filter to the throttle body, same for PCV hose; everything is fine. I cleared the code and it did not return until yesterday after filling the fuel tank and driving 70 miles.
I am at a loss as to the cause and asking the awesome Corvette Forum members for suggestions.
The last time I had this thought it was because the fuel cap broke and I was not able to tighten it down. Have replaced the cap and after filling tank I made sure cap was tight.
Drove about the same distance as last time and the Check Engine Lite illuminates.
Last time I checked and checked and checked again the air ducts from the Blackwing air filter to the throttle body, same for PCV hose; everything is fine. I cleared the code and it did not return until yesterday after filling the fuel tank and driving 70 miles.
I am at a loss as to the cause and asking the awesome Corvette Forum members for suggestions.
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
The first time the P0101 showed-up was I thought due to the Blackwing filter indicator had come apart and was letting unfiltered air into the engine. Fixed the indicator as I could not find a replacement....that was quite some time ago....about a year or so ago.
Four/five weeks ago the P0101 showed-up and all I could find was the fuel cap broke such that I could not tighten it down after I had just filled the tanks. Replaced fuel cap, cleared code and all seemed to be fine, no Check Engine Lite.
Brings me to yesterday (6/23) and after filling tank drove 45 miles, stopped for several hours and then upon drive home, Check Engine Lite with the only code being the P0101. This was the same route as driven above after filling tanks.
This is why it appears to be associated with filling the tanks. Now I know that I have a bad check valve as fuel pressure drops with engine off...so I have a fuel pump replacement in my future.
This is where I am at.........
Four/five weeks ago the P0101 showed-up and all I could find was the fuel cap broke such that I could not tighten it down after I had just filled the tanks. Replaced fuel cap, cleared code and all seemed to be fine, no Check Engine Lite.
Brings me to yesterday (6/23) and after filling tank drove 45 miles, stopped for several hours and then upon drive home, Check Engine Lite with the only code being the P0101. This was the same route as driven above after filling tanks.
This is why it appears to be associated with filling the tanks. Now I know that I have a bad check valve as fuel pressure drops with engine off...so I have a fuel pump replacement in my future.
This is where I am at.........
Melting Slicks
Joined: Nov 2014
Posts: 3,399
Likes: 1,338
From: Havre de Grace Maryland
Do you have the Shop manual for the 2004 and if so have you read the information relative to the P0101 DTC?
If you do not have the shop manual I can post the 4 relative pages if you want them. I just read through them and nothing related to the fuel system is there. The diagnostic aids point to obstruction to the MAF sensor or electrical wiring issues relative to the MAF sensor, a stuck engine coolant sensor and high or low resistance to the MAP sensor.
Post back if you want the 4 shop manual pages............
If you do not have the shop manual I can post the 4 relative pages if you want them. I just read through them and nothing related to the fuel system is there. The diagnostic aids point to obstruction to the MAF sensor or electrical wiring issues relative to the MAF sensor, a stuck engine coolant sensor and high or low resistance to the MAP sensor.
Post back if you want the 4 shop manual pages............
Right on. After a heavy acceleration got the check engine light. Decided to do the MAF cleaning for the 1st time at 38K, 3rd owner. When I went to remove the stuff so I could get to the MAF, the 2 connect clamps were loose. 
Cleaned the MAF, reattached everything tightly and no more check engine light.
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
8VETTE7: I keep looking for a set of Service manuals, so far none at a price willing to pay; so I would appreciate posting these 4 pages for me to read over.
Even though I have checked the MAF and it appears to be clean, think I will just go ahead and do what rrwirsi did and clean it and go from there.
Just really seems odd that the code is set only after I fill the tanks. Perhaps my car is just wanting more attention from me!!......
Even though I have checked the MAF and it appears to be clean, think I will just go ahead and do what rrwirsi did and clean it and go from there.
Just really seems odd that the code is set only after I fill the tanks. Perhaps my car is just wanting more attention from me!!......
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
Hey thanks for posting these pages.....have read over them and saved them. I have checked the MAF electrical connector and seemed to be fine....but will check it again and make sure all terminals are tight within connector body.
I have not oil the Blackwing since installing it. I have wiped the MAF wires very gently but have not used any type of cleaner on it....that is going to be next. Did drive Corvette yesterday and no Check Engine lite....so the mystery continues.
Thanks once again for the pages.
I have not oil the Blackwing since installing it. I have wiped the MAF wires very gently but have not used any type of cleaner on it....that is going to be next. Did drive Corvette yesterday and no Check Engine lite....so the mystery continues.
Thanks once again for the pages.
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
Soooo....probably fixed the problem...not the way I had intended....
I removed the Blackwing filter, MAF and the air duct from the engine and in the process of separating the MAF from the air duct, at just the instant the two separated, I lose my grip on the MAF and it goes for a short flight and lands on the garage floor.
Put a nice little flat spot on the air inlet. %*&@***#%$^@)(&^@&!!!!!
So have ordered a new replacement MAF as I doubt after hitting the floor it will even work at all now.
I went ahead and cleaned it, cotton tip on the three heating elements....which were quite dirty....which may have been the source of the intermittent P0101 I was seeing. I went ahead and re-installed it and will go for a drive later on today.....perhaps it may still work for the week it takes for replacement MAF to arrive.
Blasted dealership detail shop sprayed some kind of silicon all over the engine compartment to give it that "shine"....but also made everything slippery as can be. Have wiped/washed and it still remains. Makes for a really, really great dust catcher!!
I removed the Blackwing filter, MAF and the air duct from the engine and in the process of separating the MAF from the air duct, at just the instant the two separated, I lose my grip on the MAF and it goes for a short flight and lands on the garage floor.
Put a nice little flat spot on the air inlet. %*&@***#%$^@)(&^@&!!!!!
So have ordered a new replacement MAF as I doubt after hitting the floor it will even work at all now.
I went ahead and cleaned it, cotton tip on the three heating elements....which were quite dirty....which may have been the source of the intermittent P0101 I was seeing. I went ahead and re-installed it and will go for a drive later on today.....perhaps it may still work for the week it takes for replacement MAF to arrive.
Blasted dealership detail shop sprayed some kind of silicon all over the engine compartment to give it that "shine"....but also made everything slippery as can be. Have wiped/washed and it still remains. Makes for a really, really great dust catcher!!
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
After driving various distances on 7/1-2, about 5-6 engine starts, there is no check engine lite!
So the "fix" is either cleaning the MAF, dropping MAF onto the floor and denting it, or purchasing a replacement MAF but not installing.....or a combination of the three.
?????????????????????????????
So the "fix" is either cleaning the MAF, dropping MAF onto the floor and denting it, or purchasing a replacement MAF but not installing.....or a combination of the three.
?????????????????????????????
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,322
Likes: 141
From: Green Valley Arizona
May be it was a combination of four things.....if you include the "%*&@***#%$^@)(&^@&!!!!!" string of words....................although not sure "words" is the right term....
Last edited by LannyL81; Jul 8, 2017 at 10:51 AM.
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