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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

check engine light on

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Old Nov 8, 2006 | 09:14 AM
  #1  
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check engine light on

I just got a 1989 f350 2wd crewcab with a 460/auto for free, but in order to transfer the title I have to get a smog check. The check engine lite comes on usually after about 5 mins. of driving. it always goes off after turning off the engine and restarting, but comes back on after another 5 mins or so. the engine seems to run fine but could probably use a tuneup. I want to try to fix this before trying to smog it so I dont have to keep going back to the smog station, or worse- be labled a gross polluter! Anyone know how to read the code for what is wrong? I tried to search this forum, but for some reason I cant access the search function. This is the only gasser I own so Im not very familiar with how to diagnose problems(especially when there is no apparent problem other than the light being on.) Thanks in advance for any help -Scott
 
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Old Nov 8, 2006 | 10:56 AM
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fordfuelinjection.com tells you how to run codes and has a code list so u can tell what they are after u get them
 
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Old Nov 9, 2006 | 12:48 AM
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Thanks quik88! Thats exactly the info I needed!
 
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Old Nov 9, 2006 | 09:09 PM
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no problem man
 
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Old Nov 9, 2006 | 09:13 PM
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here ya go

your repair manual, chiltons or haynes, usually has the list of codes in it. you can check it with any reader or even an obdII if you purchase the cable for the obdI.
 
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Old Nov 10, 2006 | 11:50 PM
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Question Where Is The Oxygen Sensor??????

ok-so I checked the codes and I have a oxygen sensor problem. Seems easy enough to replace except I cant find the d@mn thing! The manual says it is in the exhaust manifold and looks kinda like a sparkplug, but I cant find anything that even has any wires coming out of it in that vicinity. Am I completely blind, or is the oxygen sensor somewhere else? Thanks for any hints-Scott
 
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Old Nov 10, 2006 | 11:53 PM
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check farther down after the manifold on the exaust pipe
 
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Old Nov 10, 2006 | 11:59 PM
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it should be in what looks like an H in the pipes right next to the starter. you should see the harness at least. hope that helps
 
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Old Nov 11, 2006 | 11:24 AM
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I think I found it! It is right before the catalytic convertor. can it be tested, or should I just replace it? Thanks again for the help-Scott
 
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Old Nov 11, 2006 | 11:54 AM
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just replace it. when they go bad, you cannot fix them.
 
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Old Nov 11, 2006 | 12:46 PM
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tylus is right. when an 02 goes bad you must change it. the only thing you can test is the truck side of the harness.
 
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Old Nov 12, 2006 | 10:22 AM
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I will replace it tomorrow. Autozone has one for $45 , so with the starter I replaced Im only into my "free" truck for less than $100. Cant complain about that! Thanks to everyone for the help-I couldnt have done it without you-Scott
 
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Old Nov 12, 2006 | 11:01 AM
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get a bosch sensor.

do not get a cheap one from autozone unless it is a brand name.

throwing cheap parts at a cheap truck will turn it into an expensive truck in a hurry.
 
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