Boost Guage Jumping all around. HELP :( - Ford Powerstroke Diesel Forum
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Old 02-03-2012, 01:51 PM
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Boost Guage Jumping all around. HELP :(

Hi guys,

New to posting., If anyone is interested (or maybe I'll open a thread) I took pics to the easy change out for a new block heater plug, and I just put a STANCOR GPR in today, also took pics of that.


Anyway, I have a 2000 F250 Lariat Ext. Cab Short bed, 7.3 Diesel, 134k miles, automatic, 31" tires, no lift or leveling kit (yet ), pretty much a stock truck except I have a SUPERCHIP Flashpaq hooked up, for a about a year now, the truck also has a boost pressure and temp gauge.

(tuned on economy and UNLOADED) I noticed something on the way home tonight,, normally my boost gradually builds up to about 22PSI when I just about floor it, I floored it once on the way home and the gauge needle fluttered all over the place only up to 10 psi. After I noticed this I kept getting on it too see what may be going on.

Occasionally it would fly up to 20 psi but would then jump all around, and even pulling out at about 2k RPM the boost would only go to about 2psi, normally its at least 5.

Can anyone help me out? is there anything I can test? I had the Turbo O-rings done about 5 months ago. I'm hoping the turbo isnt going

The truck doesnt seem to be acting sluggish or anything

Thanks!!!!

Tony
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Old 02-03-2012, 02:07 PM
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is your gauge electronic. Or does it use a hose to read the boost.

If it uses a hose to read boost. Then it could be a kink in the line. If it is electronic you may need to clean the sending unit.

The other thing it could be is turbo surge.
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Old 02-03-2012, 02:12 PM
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Quote:
Originally Posted by bigcountrysg View Post
is your gauge electronic. Or does it use a hose to read the boost.

If it uses a hose to read boost. Then it could be a kink in the line. If it is electronic you may need to clean the sending unit.

The other thing it could be is turbo surge.

I bought the truck like that from the dealer, although I do know the first owner, but it appears to be electric, out of the guages runs a yellow wire, maybe 10 gauge or so. it runs through the firewall and into a spring looking thing at the turbo.


What is turbo surge?

Thanks
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Old 02-03-2012, 02:58 PM
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Quote:
Originally Posted by bigcountrysg View Post
is your gauge electronic. Or does it use a hose to read the boost.

If it uses a hose to read boost. Then it could be a kink in the line. If it is electronic you may need to clean the sending unit.

The other thing it could be is turbo surge.

Jesus christ.

I just went out and revved it up pretty good, i was taking a video to show you what happened. its now shaking violently at idle and at high speeds. also a nice puddle of oil dripping from the area directly behind the oil pan, from a small vent of some sort?
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Old 02-03-2012, 03:03 PM
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Sounds like previous owner did a CCV re-route. (google the term)
If it's a tube that is leading to your crank-case on the driver side, you might be okay depending on the size of puddle.

As far as the shaking, reving in neutral is never a good idea. lol
Was it shaking before or after you revd?
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Old 02-03-2012, 04:09 PM
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Quote:
Originally Posted by azkcr View Post
Sounds like previous owner did a CCV re-route. (google the term)
If it's a tube that is leading to your crank-case on the driver side, you might be okay depending on the size of puddle.

As far as the shaking, reving in neutral is never a good idea. lol
Was it shaking before or after you revd?

never a drop under this truck and ive owned it over a year.

puddle was about 5" by 5", maybe half a quart.

checked the turbo wheel, it is spinning freely, called my diesel mechanic just now and he said it sounds like it could be something with the HPOP seal.

I revved it in park.

hes gonna take a look at it tommorow, I'm sure im going to get my colon blasted with a diagnostic fee LOL
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Old 02-03-2012, 04:45 PM
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Park, neutral. Same thing except that one holds your vehicle in place.
Free spinning was what I was referring to.
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Old 02-03-2012, 04:49 PM
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Quote:
Originally Posted by azkcr View Post
Park, neutral. Same thing except that one holds your vehicle in place.
Free spinning was what I was referring to.

hmmm, any quick fix? what kind of damage could that have caused?
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Old 02-03-2012, 04:50 PM
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Common
99-03 7.3 oil leak diagnosis
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