01 7.3 sluggish and lower boost

[matthewdlouhy]

I have a 2001 7.3 with afe intake, edge juice w/ attitude, 4" magnaflow straight exhaust. I has had a little leakage on the up pipes for a while, but recently the boost only gets to 15-16lbs where before it was 25-27 wot. Also check engine light comes on after 15 lbs of boost then truck seems sluggish. Not really any more power after about half throttle. But it would normally run Great when it was cold, after the engine warms up it never seems to have the same power/throttle response.

Tried unplugging the wastegate hose, no difference. Cleaned air filter, no difference. Scanned for codes and came up with none. Drove the truck got the light to come on. Rescanned and still no codes. Hose clamps are tight of the tubes. They also appear to be fine.

[campbellflage]

prolly a stupid question but when is the last time you changed your fuel filter?

[matthewdlouhy]

Every 10,000 miles. So about 4,000 miles ago

[matthewdlouhy]

Also Rescanned with a Snap On Scanner and got this P0476,P0284. Once the ses light comes on the codes are p1207 and p1211.

[ToMang07]

Originally Posted by matthewdlouhy

Also Rescanned with a Snap On Scanner and got this P0476,P0284. Once the ses light comes on the codes are p1207 and p1211.

~~~Trouble Codes List~~~

P0476{2}
EBP Pressure Above/Below Desired

P0284
Cylinder Fault No. 8, CCT

P1207
Cylinder 7 Injector Circuit Open/Shorted

P1211
ICP Pressure Uncontrollable, Pressure Above/Below Desired

[ToMang07]

had a little leakage on the up pipes for a while,

Sounds to me like you may have a couple problems... EBPV may not be disengaging all the way, and the Up-pipe to the turbo bay be leaking.

P0284 is usually just from the gray CPS. (I get it on mine, too.)

P1211 sounds like your Oil pressure is getting to high, I'm guessing from the programmer, but IDK.

P1207 doesn't sound good, tho. I would check your UCVH and see if the plug is tight or coming loose.

Hopefully someone more helpful comes along soon...

[matthewdlouhy]

I made a boost leak detector. Found a couple of small leaks on the i/c boots fixed them. Test drove and still on 15 max boost. Can the uppipes leaking cause it to loose 10 pounds of boost??? I know they are leaking the driver side one has soot on it and the firewall.... I can hear it leaking from inside of the truck. Sounds like my other truck when it blows the collector gasket on the headers.

[matthewdlouhy]

Does anybody have a suggestion? I'm not sure. Unplugged the MAP sensor didn't notice any difference. Also checked the turbo, clean inside, wheel looks good and it free spins easy.

[Demo250]

Yes, leaking up pipes can cause a large boost loss.

[matthewdlouhy]

I ordered the Bellowed uppipes today. We'll see next Tuesday.?.?