VIKING_MECHANIC
GMT 400 obsessed Swede.
I was driving to work this morning while it was raining pretty hard. I hit a fairly large puddle of water thanks the limited sight distance. Immediately after driving through it, my truck started to run very rough and does not want to accelerate, even with the pedal to the floor. If i come to a stop it will idle smooth for a few seconds, then it starts idle roughly and wants to die.
I first thought it was timing related and maybe got water on/under the distributor cap somehow. I got home and put my glorified diagnostic computer(it shows codes and some live data) on it and saw that the timing was sittting where it should be, around 22-25 degrees advanced. But I did notice that the SHRTFT1 is at -30.5 and the LONGFT1 is at -18. Ever since I've had the GDC, it's always showed 0 for the shrtft1 and longft1 whenever I would view the live data.
Some of the live data it is capable of showing me, I'm still trying to understand what it means and how I can use it to diagnose something, so bear with me on that.
I was planning on changing my fuel filter this weekend anyway since it's due for a change, but I don't know if that will help with the water. I imagine that I may have to drain the tank and possibly replace the pump?
Here are some screen shots of the short and long fuel trims it was showing me. 1997 C1500 5.7
This is starting the engine after it's been off for a few minutes.
This is a few minutes after it's been running.
I first thought it was timing related and maybe got water on/under the distributor cap somehow. I got home and put my glorified diagnostic computer(it shows codes and some live data) on it and saw that the timing was sittting where it should be, around 22-25 degrees advanced. But I did notice that the SHRTFT1 is at -30.5 and the LONGFT1 is at -18. Ever since I've had the GDC, it's always showed 0 for the shrtft1 and longft1 whenever I would view the live data.
Some of the live data it is capable of showing me, I'm still trying to understand what it means and how I can use it to diagnose something, so bear with me on that.
I was planning on changing my fuel filter this weekend anyway since it's due for a change, but I don't know if that will help with the water. I imagine that I may have to drain the tank and possibly replace the pump?
Here are some screen shots of the short and long fuel trims it was showing me. 1997 C1500 5.7
This is starting the engine after it's been off for a few minutes.
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This is a few minutes after it's been running.
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