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Check engine light on

Tiny
PELCNLK
  • MEMBER
  • 4 POSTS
The truck has 128000 miles on it. I have ben told that there is only one oxygen sensor on this truck.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
DUSYMAN1986
  • MEMBER
  • 7 POSTS
Iv has new timing an injectors an new head about a year ago.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get them to scan the data on the short and long term fuel trim-

Verify how many-they should be one before and one after the Cat.

Toy's uses 2 types of 02 sensors-the narrow range and the wide range also called A/F fuel sensor.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Since it runs good some of the time, I feel it is fuel related or one of the catalytic converters is starting to plug. It may be fine sometimes and partially plug others. Of, fuel pressure may be dropping.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
PELCNLK
  • MEMBER
  • 4 POSTS
There are four wires going from the oxygen sensor to computer. One of them has a braided shield over it, covered with rubber. What is the braided shield for?
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
DUSYMAN1986
  • MEMBER
  • 7 POSTS
YA I'll check that. But it only messes up when the check engine light comes on. No other time. Seems to be worse after it warms up.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The 4 wire one is the heated one- the colors Black/Black and Orange/Brown'/Green and black

The shielded one is probably the heated wire.

Rear Oxygen sensor will be black and brown
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If that light is coming on, there should be a code or codes. That concerns me. Do you have access to a real time scanner that can be viewed while the vehicle is driven?
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
DUSYMAN1986
  • MEMBER
  • 7 POSTS
No I don't man. An no it's reading no code.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Something isn't right. I am starting to think there may be a problem with the ECM.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
UNLUDKYDUCK
  • MEMBER
  • 2 POSTS
  • 1993 TOYOTA PICKUP
  • 4 CYL
  • 4WD
  • MANUAL
  • 170,000 MILES
When I shift in to 2nd gear my check engen light comes on & stays on till I turn it off what my be the reason fo this to happen
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi unludkyduck,

An error has been detected by the engine management system.

Get a scan done at Autozone and get back with the exact Diagnostic Trouble Code for us to proceed further.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
YOTA HUNT TRUCK
  • MEMBER
  • 1 POST
I am having the same problem does anyone have an answer to DUSYMAN1986 question or have you fixed yours man. I have a new engine and all in mine and would like to fix mane.
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Monday, April 27th, 2020 AT 10:20 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hey guys,

These trucks have a mechanical MAF that will fail and cause the problem you are describing. Please remove the MAF and check the air door, it should move freely.

Let me know what you find.

Best, Ken
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Monday, April 27th, 2020 AT 10:20 AM (Merged)

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