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Reply to lorunner
Sent February 21 9:07 p.m. (2 hours and 33 minutes later)
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That was next step. I was looking through my manual to determine if the Passport is OBD or OBDII compatible. If it is OBD, it will be a simple matter of shorting a couple pins in a connector, and turning the key to the ON position and reading the code from the dash. If it is OBDII, then I'll need to get a scan tool. I did call the garage that charged me for a diagnostic check to see if they had originally gotten a code, because it was not mentioned on my invoice. The garage claims that they did a system check and it produced no code, but since my engine light had come on, I would have to imagine that there would have been a code. Anyhow, I will not have time until Sunday to get to the car, so I will see if I can get a code then. The other thing that is going on with the vehicle, is that I have a slow leak in the radiator tank, and the coolant level does drop down. It hasn't overheated, but there is a water line that runs through the throttle body, so could it be that if there is no coolant flowing through there, the air is actually not getting preheated, and causing some sensor to misbehave? I am definitely replacing the radiator, so am ordering that tonight. Anyhow, once I get a code, then hopefully that will reveal the problem. Since I did pull the intake manifolds off, and was trying to clean the upper without taking off the MAP sensor, I could have messed or plugged it up. Would a faulty MAP sensor account for a rich mixture?
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Reply
Sent February 21 10:08 p.m. (51 minutes and 33 seconds later)
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I confirmed that the Honda is OBDI compliant, so next step is to locate the plug to activate the system and get the code. That will have to wait until Sunday. I will let you know the code when I have it.
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Answer
February 22 5:47 p.m. (19 hours and 38 minutes later)
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Reply
Sent February 25 7:43 p.m. (3 days and 1 hour later)
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I just checked the code, and got 44, Oxygen sensor (lean exhaust), with an explanation that the voltage is low. I tested the oxygen sensor, and verified that it gets +12V with the key in the on position. I back-probed the signal, and with the vehicle running, is basically reads 0 volts. I would conclude that the O2 sensor is the culprit, as per the manual, its output to the PCM adjusts the fuel injectors to try to keep a constant 14.7 to 1 air to fuel mixture. With a low voltage, it must be dumping just a ton of gas into the intact, evident by the black smoke shooting out the exhaust.
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Reply to lorunner
Sent February 25 9:14 p.m. (29 minutes and 19 seconds later)
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When I measured the voltage, I was looking for DC. Even so, if it was an alternating current, then I should have seen something, RMS value, I would suspect. I went ahead an ordered the O2 sensor online, so hope to get it installed this weekend. I'm assuming that my plugs are all carboned up. Do you have advice for cleaning those? I just had them replaced.
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Answer
February 26 6:00 p.m. (20 hours and 46 minutes later)
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Reply
Sent February 26 8:01 p.m. (2 hours and 1 minute later)
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I read up on it a little, and basically got the same anser. Once it's running well, some highway miles should clean them up.
Thanks for your help!
Regards,
Chris
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Just Answer! > Honda Auto Repair Information > Passport Questions
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