Lossf power/MPG after Injector O-ring install - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 1 (permalink) Old 02-27-2015, 08:51 PM Thread Starter
Strokin' it
Join Date: Feb 2015
Location: Very small town az
Posts: 2
Lossf power/MPG after Injector O-ring install

Loss of power/MPG after Injector Orings replaced


This is my First Post so let me know if its not adequate.

I own a 1999 super duty 7.3 with 200k miles on the motor and a new

transmission with 50k. DP tuner, 4" exhaust with cat/muffler delete, full set

of gauges. Injectors have been tested with no problems.

Approximately 5 months ago, during normal driving, I had a injector O-ring go

out causing the obvious problem of diesel into the fuel and a heavy

contribution to global warming (I love fossil fuels ). Had the truck

towed to a local Diesel shop for repair and during the repair I had the burn

down kit, new glow plugs, new UVC harness, and new glow plug relay

installed since I was in there anyway.

upon receiving the truck I drove it around town for a few days before taking

an approximately 300 mile road trip in the truck. During this trip, I noticed

that my MPG had dropped from approximately 18 MPG to around 10 and then

Halfway back I noticed a weird lope in the engine followed by blue smoke.

after pulling over and a tow back to the shopit was diagnosed as the Injector

O-ring again, this time leading to oil under

the valve cover and leading to hydro locking the motor while at the diesel

mechanics shop while they moved the vehicle into the bay. The shop stood

behind their warranty and corrected the issue at no cost to me (of course

replacing the necessary parts with the same high quality parts I initially had

installed )

At this time I was given the truck back only to find a flat spot in the throttle

response during normal driving accompanied by a light shimmy coming from

the motor while at the flat RPM range (15-17). My fuel mileage is still around

10MPG and I am seeing a pretty large amount of black smoke from the

exhaust when I get into the Throttle (more than normal). I have taken the

Truck back to the shop and they have tested the Injectors Again

finding no problems with the injectors (the owner did however recommend I


After about three weeks the shop finally took it to a Ford dealership who's

only finding was A code (P0605 "memory failure open circuit) and found that

they couldn't flash the PCM (they never removed my DP tuner chip)

so they recommend I purchase a new PCM due to the code

After doing my research I've found that a clogged EBPV tube/bad valve can

cause some of the symptoms so I replaced both of the above (A little change

but shimmy is still present, unknown effect on MPG because I haven't filled it

up yet)

This leads to my Question:

What do y'all think? Did Hydrolocking the motor cause something deeper in

the motor that would cause these symptoms? Do I need a new PCM?

What else should I try?

This is my daily driver and I cant afford to keep giving it to the shop for weeks

at a time while they provide no good information. I can turn a wrench but I

am just a dumb firefighter and not a mechanic so please use layman terms

when applicable. Thank you all very much and I look forward to hearing from

Powerstroke'd Blake is offline  

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