This doesn't sound good?
Elder User
Joined: Oct 2008
Posts: 708
Likes: 1
That link about reading the codes with a paper clip is a great link. I just used it. Didn't use a paper clip though, I used a couple feet of small gauge wire. Apparently in 1991 they were using 3 digit codes and not the two digit. I had three codes 328, 327, and 522. It says my EGR valve position sensor is out of spec. I was hoping I would have a code that said the Idle Air Control was out because I think that's causing my high idle. Anyway, pulling those codes could not have been easier. Get yourself a little wire Bill. All you have to do is ground out the Self-Test Input plug. It was a piece of pecan pie 
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
And you're right. These trucks get to a point where bugs litteraly come and go. I used to get paranoid about it (I used to be one of those guys I wouldn't even use my truck for work. Now I abosolutely love working it). I try to keep an eye on everything but I also try to ignore the little stuff (you should see some of the stuff I've jerry rigged on my truck). Sometimes my truck does the weirdest things - and it'll never happen again.
I guess these beasts just have personalities.
Thread Starter
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
That link about reading the codes with a paper clip is a great link. I just used it. Didn't use a paper clip though, I used a couple feet of small gauge wire. Apparently in 1991 they were using 3 digit codes and not the two digit. I had three codes 328, 327, and 522. It says my EGR valve position sensor is out of spec. I was hoping I would have a code that said the Idle Air Control was out because I think that's causing my high idle. Anyway, pulling those codes could not have been easier. Get yourself a little wire Bill. All you have to do is ground out the Self-Test Input plug. It was a piece of pecan pie
Thread Starter
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Ford, GM, and Chrysler all had different OBD 1 setups. Ford was the most advanced. In some ways it exceeds OBD II capabilities.
I bought an actron scantool that does OBD I for all the domestics and toyota, some acura also I belive. Also, it can scan anything with OBD II. My buddy works on mining equipment and says that my scantool can do them too.
I fudged up though, I canot get O2 readings on OBD II. For $280 I got it at about $100 off the joe shmoe price at my local store. Great tool if you work on cars alot. You can earn alot of free beer from your friends testing their cars too.
I bought an actron scantool that does OBD I for all the domestics and toyota, some acura also I belive. Also, it can scan anything with OBD II. My buddy works on mining equipment and says that my scantool can do them too.
I fudged up though, I canot get O2 readings on OBD II. For $280 I got it at about $100 off the joe shmoe price at my local store. Great tool if you work on cars alot. You can earn alot of free beer from your friends testing their cars too.
New User
Joined: May 2009
Posts: 15
Likes: 0
From: Milton, FL
i am having the same problem finding a eec-iv code reader... I guess the auto parts stores dont think people drive older trucks anymore 
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
Let me know if you find a code reader. I'm looking for a cheap one. I looked online but couldn't find any I liked. I just want a simple code reader for my truck for around $50.
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Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
That is indeed a bit much.
Elder User
Joined: Oct 2008
Posts: 708
Likes: 1
No, as far as I know there is no OBD1 code reader that actually gives you a code on a screen. They just blink out a light in a sequence that you convert into numbers that tell you your codes. You can get the exact same effect by using that link where it shows you how to use 10 cents worth of wire to make your check engine light blink out in sequence exactly like a 50 dollar code reader would. It seriously took me like 5 minutes to cut a piece of wire, ground out the specific circuit, and start reading codes. Save your money.
Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Equus 3120 incova code scanner-$152 on amazon.
This is what I have at home. It does all domestic OBD I, as well as OBD II.
This will give you a direct readout of what the code is, as well as a writtin discription of said code.
An example
EEC-IV code 28,
Low voltage/signal out of range, HEGO sensor.
That is probobly not an actual code 28.
Mine works great it allows me to reset timing and many other things. If you work on alot of vehicles or just want a code scanner that will work on any domestic back to 1980 buy it. Heck you can scan your buddies vehicles and get a few beers. The testlight method works. I've done it a few times but it is a pain in the ***. This I just plug in and go.
This is what I have at home. It does all domestic OBD I, as well as OBD II.
This will give you a direct readout of what the code is, as well as a writtin discription of said code.
An example
EEC-IV code 28,
Low voltage/signal out of range, HEGO sensor.
That is probobly not an actual code 28.
Mine works great it allows me to reset timing and many other things. If you work on alot of vehicles or just want a code scanner that will work on any domestic back to 1980 buy it. Heck you can scan your buddies vehicles and get a few beers. The testlight method works. I've done it a few times but it is a pain in the ***. This I just plug in and go.
Thread Starter
|
Post Fiend
Joined: Jan 2007
Posts: 7,021
Likes: 5
From: Almost Heaven
Equus 3120 incova code scanner-$152 on amazon.
This is what I have at home. It does all domestic OBD I, as well as OBD II.
This will give you a direct readout of what the code is, as well as a writtin discription of said code.
An example
EEC-IV code 28,
Low voltage/signal out of range, HEGO sensor.
That is probobly not an actual code 28.
Mine works great it allows me to reset timing and many other things. If you work on alot of vehicles or just want a code scanner that will work on any domestic back to 1980 buy it. Heck you can scan your buddies vehicles and get a few beers. The testlight method works. I've done it a few times but it is a pain in the ***. This I just plug in and go.
This is what I have at home. It does all domestic OBD I, as well as OBD II.
This will give you a direct readout of what the code is, as well as a writtin discription of said code.
An example
EEC-IV code 28,
Low voltage/signal out of range, HEGO sensor.
That is probobly not an actual code 28.
Mine works great it allows me to reset timing and many other things. If you work on alot of vehicles or just want a code scanner that will work on any domestic back to 1980 buy it. Heck you can scan your buddies vehicles and get a few beers. The testlight method works. I've done it a few times but it is a pain in the ***. This I just plug in and go.