MAF Wiring Schematic
I wonder whether you have an intermittent
problem, like a loose power or ground connection,
that responds to physical jostling. Can you log it
on the road and make the problem happen? Seems
like maybe you can probe all you want sitting still
but sitting still does not recreate the problem?
Was there any engine bay work done prior to
the onset of the trouble?
problem, like a loose power or ground connection,
that responds to physical jostling. Can you log it
on the road and make the problem happen? Seems
like maybe you can probe all you want sitting still
but sitting still does not recreate the problem?
Was there any engine bay work done prior to
the onset of the trouble?
Thread Starter
On The Tree
Joined: Nov 2001
Posts: 164
Likes: 0
From: Lewisville, TX
The last thing that was done under the hood was the N20 install, but that has been in there for a few thousand miles with no trouble. Other than that I had a new motor put in close to 8K miles back.
I don't have anything to log with, and all I know is that the Tech II was failing the MAF. Guess Who ? was monitoring that while I was driving. I am not sure if he saw anything else that was abnormal. We spliced in a new yellow wire, ran a separate chassis ground, and ran a separate power wire to the MAF as well. The results were the same after doing this as is was before touching it.
I don't have anything to log with, and all I know is that the Tech II was failing the MAF. Guess Who ? was monitoring that while I was driving. I am not sure if he saw anything else that was abnormal. We spliced in a new yellow wire, ran a separate chassis ground, and ran a separate power wire to the MAF as well. The results were the same after doing this as is was before touching it.
TECH Addict
Joined: Feb 2004
Posts: 2,826
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Originally Posted by WillieD
The last thing that was done under the hood was the N20 install, but that has been in there for a few thousand miles with no trouble. Other than that I had a new motor put in close to 8K miles back.
I don't have anything to log with, and all I know is that the Tech II was failing the MAF. Guess Who ? was monitoring that while I was driving. I am not sure if he saw anything else that was abnormal. We spliced in a new yellow wire, ran a separate chassis ground, and ran a separate power wire to the MAF as well. The results were the same after doing this as is was before touching it.
I don't have anything to log with, and all I know is that the Tech II was failing the MAF. Guess Who ? was monitoring that while I was driving. I am not sure if he saw anything else that was abnormal. We spliced in a new yellow wire, ran a separate chassis ground, and ran a separate power wire to the MAF as well. The results were the same after doing this as is was before touching it.
Originally Posted by WillieD
I picked up another MAF locally and put it in, and it ran the same. I have not swapped cars to see if the problem reproduces on their car.
Thread Starter
On The Tree
Joined: Nov 2001
Posts: 164
Likes: 0
From: Lewisville, TX
It is probably the fact that it is running off of the MAF and hits SD mode quickly and comes back. I am guessing that is what is happening and the A/F is getting jacked and causing the car to bog and jump when it goes rich and lean. I am not positive on any of this simply because I don't know where the problem is starting.
Thread Starter
On The Tree
Joined: Nov 2001
Posts: 164
Likes: 0
From: Lewisville, TX
Update:
This morning and most of the day my car was running fine and not throwing a code. I drive my car all day long and made about 7 or 8 stops today, and did not have any issues until the end of the day. On my last leg home it started acting up again, but not as bad as it usually does. Last night I really did not do anything other than follow the black/white wire back to the drivers side head. I had pulled off the wire loom all the way back there and put it back on.
I am not sure what caused it to run fine for most of the day and then act up again at the end of the day.
This morning and most of the day my car was running fine and not throwing a code. I drive my car all day long and made about 7 or 8 stops today, and did not have any issues until the end of the day. On my last leg home it started acting up again, but not as bad as it usually does. Last night I really did not do anything other than follow the black/white wire back to the drivers side head. I had pulled off the wire loom all the way back there and put it back on.
I am not sure what caused it to run fine for most of the day and then act up again at the end of the day.
TECH Addict
Joined: Feb 2004
Posts: 2,826
Likes: 0
Originally Posted by WillieD
Update:
This morning and most of the day my car was running fine and not throwing a code. I drive my car all day long and made about 7 or 8 stops today, and did not have any issues until the end of the day. On my last leg home it started acting up again, but not as bad as it usually does. Last night I really did not do anything other than follow the black/white wire back to the drivers side head. I had pulled off the wire loom all the way back there and put it back on.
I am not sure what caused it to run fine for most of the day and then act up again at the end of the day.
This morning and most of the day my car was running fine and not throwing a code. I drive my car all day long and made about 7 or 8 stops today, and did not have any issues until the end of the day. On my last leg home it started acting up again, but not as bad as it usually does. Last night I really did not do anything other than follow the black/white wire back to the drivers side head. I had pulled off the wire loom all the way back there and put it back on.
I am not sure what caused it to run fine for most of the day and then act up again at the end of the day.
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Verdad Gallardo TECH Addict
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Originally Posted by WillieD
I don't believe anything has ever been touched for the SD side of the tune. It has all been based around the MAF.
Originally Posted by WillieD
Update:
This morning and most of the day my car was running fine and not throwing a code. I drive my car all day long and made about 7 or 8 stops today, and did not have any issues until the end of the day. On my last leg home it started acting up again, but not as bad as it usually does. Last night I really did not do anything other than follow the black/white wire back to the drivers side head. I had pulled off the wire loom all the way back there and put it back on.
I am not sure what caused it to run fine for most of the day and then act up again at the end of the day.
This morning and most of the day my car was running fine and not throwing a code. I drive my car all day long and made about 7 or 8 stops today, and did not have any issues until the end of the day. On my last leg home it started acting up again, but not as bad as it usually does. Last night I really did not do anything other than follow the black/white wire back to the drivers side head. I had pulled off the wire loom all the way back there and put it back on.
I am not sure what caused it to run fine for most of the day and then act up again at the end of the day.
