Question about 1993 GMC Sierra K3500

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My 94 gmc k3500 will just shut off while driving and when it shifts from 1st to 2cd the truck sputters. 6.5 deisel

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  • 2 Answers


Hi there,
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Posted on Jan 02, 2017

  • 1498 Answers

SOURCE: 94 dodge ram pickup 1500 v-6

Hi there,

Many dodge models actually have two o2 sensors. I'm not sure if this applies to your model. If so, one is on or just downstream of the exhaust manifold. The other on the outlet pipe of the catalytic converter.

The PCM compares the readings and adjusts the fuel/air mix to keep the catalytic converter operating at max efficiency.

A malfunction in any portion of this sub-system could cause your symptoms. So let's run a test on the o2 sensor(s).

  • You'll need an Ohm Meter.
  • Be careful when doing this. If the lead wires on the sensors are damaged, the sensor will likely malfunction. Locate and pull the electrical connector from the o2 sensor.
  • Attach Ohm Meter leads to the terminals.
  • It should read 5 to 7 Ohms
  • If not, replace them
Keep in mind, these symptoms could also be caused by many other things.
  • Timing
  • Vacuum leaks
  • Bad gas
  • Clogged catalytic converter
  • Cracked/bad distributor
  • Plug wires shorting against one another
  • Weak spark
  • Rich Air/Fuel mix
If your vehicle has OBD (On Board Diagnostics), you can narrow down the problem by checking for trouble codes.

To do this manually, get a pad, a pen, your keys and get in your truck.
(the procedure for entering diagnostics may vary, but this works for the dodges I've worked on)
  • What to expect: On your dash there is a CHECK ENGINE or MALFUNCTION light. It will blink to signify the digits of any error codes. The codes have two digits with a pause between them. Blink-Pause-Blink-Blink would signify a 12.
  • To enter diagnostics: Turn the ignition ON-OFF-ON-OFF-ON (within 5 seconds)
  • The codes will begin to flash
  • Write them down.
Of course, its easier to go to an auto parts store that offers code reading service.

Question: Of all the possible causes, why did the o2 sensors get picked as the cause? Is there more to the story?

Any way, run the tests, perform the diagnostics and get back with me, we can go from there.

Hope this helps


Posted on Jul 29, 2008

  • 1 Answer

SOURCE: 94 GMC truck diesel starts,runs and then dies and will not start

I have the same problem and have trouble codes 35 and 36. I found out that there is a computer module that needs replaced as it sits low in a valley and gets hot and seperates. I am reseaching about the a/m fix that installs the new module away from heat.

Posted on Mar 12, 2009

  • 1 Answer

SOURCE: 95 chevy k3500 will not shift into 4hi

Hi ..i had the same same problem in my k3500,check 4x4 fuse first .if thats blown replace it if blows when you put in 4x4 go under the car and unplug the actuator at the front diff.go back in the cab and put another fuse in, shift into 4x4 if the fuse does not blow this time you will need a new actuator.
thats what happened with mine and now 4x4 is sweet.i thought mine worked to at the start until i got bogged and noticed my front wheels wernt turning.

Posted on Mar 12, 2009

  • 85206 Answers

SOURCE: i need a diagram to show me how to replace my

I don't have a diagram but here are written instructions.

I don't know how much you know about the subject so I will start at the beginning. First you have to get to it, you can pull the motor or leave it in the vehicle. Its a little harder with it in depending on the space you have in engine compartment. If your leaving the motor in, which I imagine you are, your going to have to take the front end of the vehicle apart. Remove the grill, bumper if need be, radiator, fan, water pump, harmonic balancer, you will need to buy a puller and a installer for the harmonic balancer. You can get a puller kit from harbor frieght tools for $10. You can buy the installer from Summit racing (web site) for around $30 or you can buy one that will do both the install and removal from summit for $70. Once you have removed your harmonic balancer you can remove your timing cover to expose your timing chain. Turn the motor using a socket wrench until the timing marks on the crank gear and cam gear line up. The marks are usually just white dots, you want the crank mark to be up towards the cam and the cam mark towards the crank, the marks will be up and down from each other. Once you have the marks lined up remove the bolts holding the timing chain to the cam and crank. Remove the timing chain as a whole unit with the cam and crank gear still on it. If the crank gear doesn't want to come loose use your puller on it. when you get it off just put your new gear on and line up the timing marks then put it back on as one unit. If you cant get the crank gear on all the way by hand buy a crank install tool (summit) they run about $24. While you have the thing apart it would be a good Idea to put a new timing chain on. Depending on your vehicle this would also be a good time to change your cam if need be. Its not that hard to do it just takes a while, take your time and don't force anything. If you need anymore help my email is [email protected]

Posted on Jul 19, 2009

  • 135 Answers

SOURCE: hard shift manual transmission

check the fluid in the slave cyclinder,it looks like a brake fluid tank, you need to use brake fluid in it also, look to see if you have one for brakes and one for the clutch, fill it up to full line ,hope to help

Posted on Jul 19, 2009

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