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  #1  
Old 10-29-2010, 07:49 AM
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Kens04 Kens04 is offline
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Default Loss of power at highway speeds

A few weeks back I thought I felt something wierd as if I took my foot off the gas as fast as I could. Almost like when your driving a stick, downshift and the vehicle kind of surges forward a little. At the time I thought maybe it was something in the road I just didnt notice.
So on my way to work this morning the same thing happens, but this time it was twice in a row and a little more noticable this time.
I know there was issues with stalling due to a clogged EGR valve but I replaced mine maybe 4 months ago and all has been fine since.
I had an 86 toyota truck many years back and when the fuel filter started to go it was a similar feeling, replaced and all was good. I know the fuel filter in my truck now is in the tank and is supposed to last.

ANy help? Comment, questions, concerns? Thanks

Last edited by Kens04; 10-29-2010 at 07:52 AM.
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Old 10-29-2010, 08:24 AM
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Interesting problem. Any codes?

You say it feels like a surge when you lift off the gas? What gear are you in when this happens.
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Old 10-29-2010, 08:53 AM
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No Im not moving my foot off the gas, but feels like I am taking it completely off. No codes.
Its got to be in fifth gear, I was going about 60mph and a slight downhill grade, but not enough for the tranny to downshift for any reason.

Last edited by Kens04; 10-29-2010 at 09:39 AM.
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Old 10-29-2010, 09:43 AM
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So I just read (googled my problem) that someone else had a very similar issue only more frequent, and no codes. They had cat conv., plugs wires, cap and rotor replaced, new fuel pump, and found out it was a bad O2 sensor.

Granted this was on an 01 and mines an 04. Hypothetically speaking if it was the same issue, how do you diagnose soemthing like that without a CEL? O2 sensors seem to always be setting the CEL on.
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Old 11-04-2010, 03:46 PM
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my trck acted weird like it was stuck in a lower gear and wouldnt upshift. it turned out to be the throttle position sensor. try resetting your pcm or calibrating the sensor to see if it helps
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Old 11-04-2010, 04:00 PM
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The way to diagnose a bad O2 sensor that isn't setting a code is with a lab scope so you can see the waveform and dtermine if there are any glitches, dropouts or if the sensor is just lazy.
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