intermittent power loss
#1
intermittent power loss
I have not experienced this but my wife has ...... here is her description.
This is a 2004 Suburban LT with the 5.3 ... no flex fuel. Randomly when driving she feels like the car is still moving forward but losing power. The tach slowly drops and she feels a mild bucking / sluggishness in the truck. The truck never dies and recovers but its still a very concerning problem for me since she drives it a lot and also takes our kids everywhere with it.
I bought this a few weeks ago (1 owner truck) and he said that he recently replaced the fuel pump, battery and I tested the alternator and it looks good. I also recently verified all vacuum lines are good (visual inspection) replaced the MAF sensor and air filter. There are no codes posted or pending codes in the computer so I am not sure where to go next.
Any advice on what to look for? Crank position sensor, fuel filter, fuel pressure even though the pump was replaced, coolant temp sensor, etc......
thanks,
-Steve
This is a 2004 Suburban LT with the 5.3 ... no flex fuel. Randomly when driving she feels like the car is still moving forward but losing power. The tach slowly drops and she feels a mild bucking / sluggishness in the truck. The truck never dies and recovers but its still a very concerning problem for me since she drives it a lot and also takes our kids everywhere with it.
I bought this a few weeks ago (1 owner truck) and he said that he recently replaced the fuel pump, battery and I tested the alternator and it looks good. I also recently verified all vacuum lines are good (visual inspection) replaced the MAF sensor and air filter. There are no codes posted or pending codes in the computer so I am not sure where to go next.
Any advice on what to look for? Crank position sensor, fuel filter, fuel pressure even though the pump was replaced, coolant temp sensor, etc......
thanks,
-Steve
#3
I replaced the battery with one from my Silverado since i suspected it was bad and the rough idle went away. First drive the hesitation / bucking problem was still there just not as bad. I put it in tow haul mode and the problem went away fully. I then put it back in regular mode and the problem has not surfaced. Could a bad battery or battery connection cause that type of issue? What does changing from tow haul mode back to regular mode do or was that just a coincidence?
#5
Fixed!!!!!!!
Well I found the root cause of both my problems ..... a bad battery. I put a platinum AGM in and the voltage fluctuation and bucking / hesitation is all gone. Never thought a bad battery could cause so many issues.