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1994 Chevy Truck oxygen sensor

Tiny
CDOWD
  • MEMBER
  • 1994 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 159,000 MILES
On my truck someone put duals on it and just straight pipes no mufflers or oxygen sensors and it is running real bad if I put it drive and hit the gas it will spin the tires but going down the highway it misses but if I get up to 65 or 70 it runs good so what do you think my problem is thanks
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Wednesday, April 8th, 2009 AT 1:35 PM

18 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
May be time for tune up.

Spinning the tires? Check to make sure the ignition timing is properly set.
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Wednesday, April 8th, 2009 AT 10:19 PM
Tiny
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Well I have already put new spark plugs and wires what and set the timming so what do I do now
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Wednesday, April 8th, 2009 AT 10:28 PM
Tiny
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Start vehicle up and take off right away. Are symptoms there on cold engine?
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Friday, April 10th, 2009 AT 8:52 AM
Tiny
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  • 25 POSTS
Wher is the oxgen sensor harness
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Saturday, April 11th, 2009 AT 9:20 AM
Tiny
BLACKOP555
  • MECHANIC
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It is connected to the oxygen sensors.
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Saturday, April 11th, 2009 AT 3:40 PM
Tiny
CDOWD
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  • 25 POSTS
Hey man look im not stupid what I have been trying to tell you is that none of that is there the oxagen sensor has been bypassed. And the wires are gone
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Sunday, April 12th, 2009 AT 10:15 PM
Tiny
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Thats going to be a hard one. Would you like a wiring diagram if I can find you one that way you can find whats there and what is supposed to be on your vehicle and whats not?
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Monday, April 13th, 2009 AT 2:17 PM
Tiny
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Yes I would but one more thing I unpluged the vacum hose off of the map sensor and it ran fine so could the map sensor on my truck make it run like a junker if it was no good?
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Monday, April 13th, 2009 AT 3:59 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
The map sensor is a very important part of the efi system.

It is used in place of a MAF sensor on earlier model vehicles and it is cheaper. It will most definetely cause your vehicle to run horrible.
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Monday, April 13th, 2009 AT 9:53 PM
Tiny
CDOWD
  • MEMBER
  • 25 POSTS
Ok I had to order the map sensor but now if I try to start my truck it takes along time to start and when it starts if I dont hold the gas it will not run so do you think it is the map sensor?
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Monday, April 20th, 2009 AT 9:40 AM
Tiny
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Will the map sensor make the truck not run
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Monday, April 20th, 2009 AT 1:11 PM
Tiny
BLACKOP555
  • MECHANIC
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If the map sensor is reading improperly it wont work! Disconnect the harness from the map sensor. Run any better?

The map sensor is used in correspondence with the TPS sensor and o2 sensor for fuel delivery on your model vehcle. They are now replaced with the MAF sensor.
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Monday, April 20th, 2009 AT 6:10 PM
Tiny
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Yea it will run better if I disconnect it but it will not stay running and I bypassed the o2 sensor
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Monday, April 20th, 2009 AT 7:47 PM
Tiny
CDOWD
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So what do you think I sould do
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Tuesday, April 21st, 2009 AT 11:15 AM
Tiny
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I needed a new map sensor
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Wednesday, April 22nd, 2009 AT 2:59 PM
Tiny
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How long will the vehicle run for? Disconnect all sensors and see if it will run longer.

Then slowly reconnect one at a time till it stalls or runs roughly.

That component is the one with a issue.

Sorry for the slow reply.

Check engine light?
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Wednesday, April 22nd, 2009 AT 7:47 PM
Tiny
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It will run for about five mins then it shuts off I put it on the computer and it said the map sensor was bad
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Thursday, April 23rd, 2009 AT 6:56 AM
Tiny
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The map sensor if disconnected should still allow the vehicle to run.

Time to check the wiring harness for it and make sure it isnt damaged.
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Thursday, April 23rd, 2009 AT 9:28 PM

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