Need help keeping my truck on the road
#1
Need help keeping my truck on the road
I've got a '92 DLX 2wd V6 pickup with a few codes and I'm hoping you can help me keep racking up the miles on this truck. 211k ain't enough!
Check engine light popped up and when I check codes, I get the following.
14
24
31
52
Looking at the codes, I have a hard time believing all those parts went bad at once. I believe a common [ground] wire might have been damaged. Anyone have an idea of what might be going on? Or at the very least, have a wiring semantic?
Any assistance would be greatly appreciated!
Check engine light popped up and when I check codes, I get the following.
14
24
31
52
Looking at the codes, I have a hard time believing all those parts went bad at once. I believe a common [ground] wire might have been damaged. Anyone have an idea of what might be going on? Or at the very least, have a wiring semantic?
Any assistance would be greatly appreciated!
#2
Registered User
52 is usually the pigtail between the cylinder head and intake manifold. If you replace head gaskets always replace that wire! Has any work been done to it recently, even something small or not related to the engine? Are there driveability problems? The light came on out of nowhere or its been on for a while?
#4
14 Ignition signal.
24 Intake Air Temperature Sensor signal.
31 Air Flow Meter signal (Vacuum Sensor signal).
52 Knock Sensor Signal.
nv4runner, I'm not sure where the pigtail you are describing is installed. However, while looking around, I found a ported vacuum switch with a broken nipple. That probably explains code 31. Might even explain code 52 if the engine ran lean enough.
Last time code 14 came up was when my TPS was bad. Until recently, that didn't come up after replacing the TPS.
I fixed the leak and reset the computer. So far so good (knocks on wood.)
24 Intake Air Temperature Sensor signal.
31 Air Flow Meter signal (Vacuum Sensor signal).
52 Knock Sensor Signal.
nv4runner, I'm not sure where the pigtail you are describing is installed. However, while looking around, I found a ported vacuum switch with a broken nipple. That probably explains code 31. Might even explain code 52 if the engine ran lean enough.
Last time code 14 came up was when my TPS was bad. Until recently, that didn't come up after replacing the TPS.
I fixed the leak and reset the computer. So far so good (knocks on wood.)
#5
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... I'm not sure where the pigtail you are describing is installed. However, while looking around, I found a ported vacuum switch with a broken nipple. That probably explains code 31. Might even explain code 52 if the engine ran lean enough.
...
I fixed the leak and reset the computer. So far so good (knocks on wood.)
...
I fixed the leak and reset the computer. So far so good (knocks on wood.)
Code 52 has nothing to do with running lean. Code 52 has nothing to do with whether your engine is knocking! It just says the ECU has lost touch with the Knock Sensor. When that happens, the ECU can't tell if the engine is knocking or not, and since knocking can blow a hole in a piston the ECU dramatically retards timing to save the engine.
Unfortunately, the knock sensor wiring is in a hellish environment, and it is carrying a very subtle signal. So if a wire breaks ever so slightly, or if the shield is sufficiently compromised, you'll get the code. As others have stated, the mostly likely culprit is the "pigtail," as it the most mis-treated part of your whole engine. But even if the pigtail is good, the signal hasn't gotten back to the ECU yet.
Good luck!
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voiddweller
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05-02-2016 09:10 PM