2000 excursion 7.3l turbo problem
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From: Lima Peru
2000 excursion 7.3l turbo problem
i bought my truck with 45k miles on it, engine runs smooth. its stock excpet for a bullydog outlook and a 100hp chip (not sure which one).
when i press the accel the truck just does not accelerate as i expected. sure its not a race car, but i should feel the push and the turbo kick in. i travel to work in a double decker 400hp bus. i expected to feel at least the same push, not even close!
the outlook monitor shows the turbo pressure gets to only 8psi when full accel. is this normal? shouldnt it be higher? (like between 20 to 30psi).
i wonder if this problem has to do with the chip. should i have it removed?
any comments are wellcome!
when i press the accel the truck just does not accelerate as i expected. sure its not a race car, but i should feel the push and the turbo kick in. i travel to work in a double decker 400hp bus. i expected to feel at least the same push, not even close!
the outlook monitor shows the turbo pressure gets to only 8psi when full accel. is this normal? shouldnt it be higher? (like between 20 to 30psi).
i wonder if this problem has to do with the chip. should i have it removed?
any comments are wellcome!
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Welcome to FTE.
I would take the chip out and see how it runs. I would also look for a boost leak. You need to check the clamps on the 6 rubber boots to make sure they are tight and not leaking. There are 4 boots on the intercooler tubes and 2 boots under the spider, which is right in frot of the turbo going down toward the plenum's.
We will be showing you pics for what you don't understand.
I would take the chip out and see how it runs. I would also look for a boost leak. You need to check the clamps on the 6 rubber boots to make sure they are tight and not leaking. There are 4 boots on the intercooler tubes and 2 boots under the spider, which is right in frot of the turbo going down toward the plenum's.
We will be showing you pics for what you don't understand.
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Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
45k miles?? That truck is worn slap out. Just send it up here to the states and I'll dispose of it properly... 
If its 45k km's, I may come pick it up! 
Assuming your boost reading is accurate - you are right, there is a problem. You should see 15-20psi in 'stock' tune and at least 25psi in '100hp' tune.
Most likely suspect would be a boost leak, like Rick said.
You can check for leaks pretty easily with a homemade 'leak detector'. This one was made using a 3" PVC cap and a schrader valve:
Clamp this piece in where air filter box goes and put 10-15psi into intake tube - effectively pressurizing the whole intake system. Listen for leaks - some air will leak around CCV on drivers-side valve cover, but it is primarily the 'boots' that connect the intercooler piping to the intercooler and the 2 boots that connect the 'spider' (just in front of turbo) to the plenums in heads. The latter is a common leak spot - the hose clamps here are notoriously weak and tend to loosen up over time. Spray a soapy-water solution on all of these connections and look for bubbles.
If ya find a leak, remove the boot(s), clean thoroughly with soapy water (remove OIL) and reassemble/retest.
Let us know if ya need some pics to see where these places are...
If its 45k km's, I may come pick it up! Assuming your boost reading is accurate - you are right, there is a problem. You should see 15-20psi in 'stock' tune and at least 25psi in '100hp' tune.
Most likely suspect would be a boost leak, like Rick said.
You can check for leaks pretty easily with a homemade 'leak detector'. This one was made using a 3" PVC cap and a schrader valve:Clamp this piece in where air filter box goes and put 10-15psi into intake tube - effectively pressurizing the whole intake system. Listen for leaks - some air will leak around CCV on drivers-side valve cover, but it is primarily the 'boots' that connect the intercooler piping to the intercooler and the 2 boots that connect the 'spider' (just in front of turbo) to the plenums in heads. The latter is a common leak spot - the hose clamps here are notoriously weak and tend to loosen up over time. Spray a soapy-water solution on all of these connections and look for bubbles.
If ya find a leak, remove the boot(s), clean thoroughly with soapy water (remove OIL) and reassemble/retest.
Let us know if ya need some pics to see where these places are...
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
Likes: 4
From: Grand Lake, La.
Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
But... find the REAL problem, first.
You shouldn't just install a tuner on an engine that has a problem. It should be in tip-top shape first, THEN add the tuner.
Pop
You shouldn't just install a tuner on an engine that has a problem. It should be in tip-top shape first, THEN add the tuner.
Pop
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Hotshot
Joined: Jul 2008
Posts: 12,782
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From: N.GA Mountains
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From: Lima Peru
thanx for the responses, i had the truck scanned and the power and turbo boost curves are on the factory ones. apparently its OK.
what still bugs me is that the truck is very sluggish. it gathers speed overtime but i cannot feel it accelerate. i would asume that one would feel an engine this size accelerate.
it is stock now, any mods to increase the power recommended?
i am installing an 10inch lift plus 37s.
what still bugs me is that the truck is very sluggish. it gathers speed overtime but i cannot feel it accelerate. i would asume that one would feel an engine this size accelerate.
it is stock now, any mods to increase the power recommended?
i am installing an 10inch lift plus 37s.
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