If it aint a CAT itsa DOG
Join Date: Apr 2007
Location: North Branch, MN
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7.3 with low power
Ok guys I have owned a ton of different ford diesels over the years and this is my 4th 7.3. This and and my other ones are all super duties 99-01. I just bought this thing and it has 202k on it. It is way slower than any other 7.3 i have ever owned. It seems like it takes for ever to build boost. I changed my oil to Delo 5w40 synthetic, AFTER i did this i get a loud engine knock after it warms up, but only at idle. Here is a list of what is going on and what i have tried.
-no abnormal smoke
-has a SLIGHT exhaust leak on one up pipe, but i've had others with this before. Its not blowing soot onto the firewall.
-its only building about 16psi of manifold pressure on my AE, but takes forever to get there.
-#8 cyl fails contribution test (could be normal)(part of knocking sound?)
-all injectors pass buzz test
-haven't had time to change fuel filters, but truck was maintained well with paperwork to proove
-CAC boots seem to be ok except for oil soaked
-can barely hear the turbo spool up like i could on other ones
Anything else I might be forgetting? Also that engine knock was not present when i bought the truck, only started doing it after i changed oil to full syn. I had this happen on my 01 with the #8 cackle, but this seems a lot louder, almost like all the injectors are starving a little. Any more ideas would be great.
10,000 LAKES CHAPTER MEMBER
2003 F350 Crew cab long box, FX4, 6.0, torqshift, Lariat.