Drove Truck Yesterday

[icanfixall]

Yesterday I was helping daughter with yard duties like planting 2 flats of st augustine. Following her to get her Acura TSX oil changed. While on the freeway exchanges I found myself with about 3/4 throttle gaining speed to merge into traffic when I saw the boost gauge nearly pegged past 15 lbs.. I backed off and saw it drop so I added power and watched it climb. Pyro was at 750 or so and engine felt fine. So I help the rpm on about 2700 till the boost settled out. I have not done anything to my engine in months other than check the timing on my rental meter to insure they work before shipping them. No fuel turned up or and work. Only thing different was I left the fuel tank cap loose because I have been getting a vacuum on that tanks after I did the harpooning of the filler modifications. I have usually heard the vacuum hiss whenever I open the tanks to fuel up. No matter how long the truck can sit it still happens. My rig can sit not used for 4 or 5 days at a time. I think its time to remove the filler necks and install a 1/4 inch copper vent and see if anything stays the same. Still can't figure out where the extra 4 or 5 lbs of boost came from.. Maybe a worn out Banks gauge..

 

[79jasper]

Interesting to say the least.

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[FORDF250HDXLT]

did you ever mess with your wastegate?

 

[icanfixall]

I reset the wastegate probably 6 years ago and have had the throttle pushed thru the floor but never swa 15 lbs of boost. This is the wonder why it happened yesterday idea. I have not changed anything I recall. Have not even changed the oil in a few months not changed the fuel filter is probably 4 years now. I do check the filter lite every startup..

 

[The Warden]

If you have the standard plastic tube going from the intake to the gauge, you might check the hose...maybe it's breaking down and somehow acting as a one-way valve? Or, like you said, maybe the gauge is dead? If everything else seemed happy, I'm doubting your turbo actually boosted that high.

I had a plastic tube to an oil pressure gauge let go on my truck, many years ago...pumped most of the oil out onto the road before I realized what was happening fortunately, no lasting effects from that event...

 

[firehawk]

Check the wastegate. I bet it was not opening. When boost gauges fail, they usually read low, not high.