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Author
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Topic: Check engine- code reader won't spit out codes
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50.stang
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Member # 4009
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posted
 
 
My check engine light came on after installing a new set of O2's on an 88 and it won't go off. When I hook my code reader up to the port, when its put to test mode, the light will just go dim and it wont spit out the codes. Has anyone ever ran into this problem and what was the fix.
PS even when I put the old o2's back on the light would not go off.
Posts: 80 | From: Bay Area | Registered: Jan 2004
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JohnB
Tech Moderator
Member # 969
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posted
Did you make sure to hook up both connectors?
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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50.stang
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Member # 4009
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posted
Yea I did,
Ive ran hundreds of these tests and I never ran into this
Posts: 80 | From: Bay Area | Registered: Jan 2004
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JohnB
Tech Moderator
Member # 969
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posted
Well, unfortunately it sounds like the PCM may be the problem. I have the exact same prob with my 01...and it's because of the PCM.
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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50.stang
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Member # 4009
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posted
thats not good, I was hoping that it wouldn't be the problem
Posts: 80 | From: Bay Area | Registered: Jan 2004
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silverLX
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Member # 3207
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posted
quote:
Originally posted by 50.stang:
thats not good, I was hoping that it wouldn't be the problem
better than not knowing the problem ![[patriot]](graemlins/patriot.gif)
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88LX hatch 410w
88LX vert gears, exhaust
95GT H/C/I
Posts: 1613 | From: Sonoma County | Registered: Aug 2003
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JohnB
Tech Moderator
Member # 969
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posted
Before you throw another PCM in...check your ENTIRE harness and make sure you don't have any breaks, shorts, bare wires, etc. There is a reason why it is going out. ![[Smile]](smile.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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50.stang
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Member # 4009
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posted
Ill do that, I dod change the O2 harness before this happened also, maybe that had something to do with it. But I did change it back and it didnt help.
Posts: 80 | From: Bay Area | Registered: Jan 2004
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by 50.stang:
My check engine light came on after installing a new set of O2's on an 88 and it won't go off. When I hook my code reader up to the port, when its put to test mode, the light will just go dim and it wont spit out the codes. Has anyone ever ran into this problem and what was the fix.
PS even when I put the old o2's back on the light would not go off.
i had this problem turned out after spending alot of money on trying to fix the problem that my computer had failed. Atleast i got a rid of a lot of wiring problems ![[Eek!]](eek.gif)
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17578 | From: 530 | Registered: Jun 2002
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50.stang
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Member # 4009
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posted
could I use an auto computer with a 5 speed and what are the effects?
Posts: 80 | From: Bay Area | Registered: Jan 2004
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Wildfire532FB
CAFords OG
Member # 1482
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posted
quote:
Originally posted by 50.stang:
could I use an auto computer with a 5 speed and what are the effects?
i don't think there would be a problem.
[ January 31, 2006, 11:40 AM: Message edited by: Cobra5.0Jeep ]
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./_ _ _ ___ __\
(]]]_ _ o _ _[[[)
|\_o_ __ __o_/|
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68 Fastback
84 CJ7
94 HMMWV
95 GT
03 F350
17 Fusion Hybrid
Posts: 17578 | From: 530 | Registered: Jun 2002
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Jdub07
( O Y O )
Member # 2728
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posted
This might sound dumb but how old is the battery in your scanner?
Posts: 7282 | Registered: Apr 2003
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50.stang
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Member # 4009
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posted
I thought about the same thing, I changed the battery and the same result. I will use my friends scanner before I swap PCMs, just to see if its a scanner problem.
Posts: 80 | From: Bay Area | Registered: Jan 2004
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