Poor perf from 7.3
Thread Starter
|
Elder User
Joined: Sep 2001
Posts: 616
Likes: 0
From: WHITE LAKE, MI
Poor perf from 7.3
My 2003 7.3 PSD seems to have lost a little bit of power, but most importantly, it has a bog/hesitation and acts like it is "missing" for lack of a better word, from approx 2000 to 2500 rpm. At this point I can't accelerate up a hill at this rpm range. Could this be a CPS? I have the original yet, and 135,000 miles.
Thanks,
Tim
Thanks,
Tim
Elder User
Joined: Sep 2004
Posts: 824
Likes: 0
From: Helotes, Texas
CPS is a possibility, but there are a lot of things that could cause problems like that. It wouldn't hurt to change the CPS, if it doesn't fix the problem then at least you have a spare one and have eliminated it as a possibility. It's odd that it only occurs between those RPM ranges. Have you had the codes pulled?
Max
Max
Thread Starter
|
Elder User
Joined: Sep 2001
Posts: 616
Likes: 0
From: WHITE LAKE, MI
No, I haven't had anyone look at it yet. I thought I would get a check engine light or something flashing? I generally don't like dealers as you need to drop the truck off for a day or two, then they rape you on the cost of repairs. I can't be without it that long. I am trying to figure this one out for myself. Could an inoperative vacuum pump have anything to do with it? My vacuum pump quit at about the same time. I haven't worried too much about it because the only thing that it seems to affect is the airflow control for the heat/ac.
Elder User
Joined: Sep 2004
Posts: 824
Likes: 0
From: Helotes, Texas
You can take your truck to a auto parts store and have the codes checked. Call them first and make sure they have a scanner that will do the PSD. I don't think that a bad vacuum pump will effect the engine performance, but if you have auto hubs on your 4x4, they won't won't work correctly. I know this may sound stupid, but have you checked the air/fuel filters or replaced lately?
Max
Max
Thread Starter
|
Elder User
Joined: Sep 2001
Posts: 616
Likes: 0
From: WHITE LAKE, MI
Yep, the fuel filter is almost new and I have the huge Napa commercial/industrial filter. At first, I started thinking it may have been a filter issue, but it runs great @ WOT. On light accel, once it hits 2000 rpm, it stutters,stumbles, kind of like when a gasser has a couple of bad plugs. once past about 2300, it smooths right out. I wasn't aware the auto parts stores could check codes, so I will give that a shot. Thanks for the tip!!
Tim
Tim
Gone Fishin for Mark
Joined: Nov 2004
Posts: 1,354
Likes: 2
From: West of Houston
Trending Topics
Elder User
Joined: Nov 2004
Posts: 798
Likes: 0
Originally Posted by joegebff
It may be the Throttle Position Sensor......fancy talk for gas pedal.
That would be where I'd start also. The PCM won't know it has a problem.....there won't be any codes in that situation.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Junior User
Joined: Jul 2003
Posts: 93
Likes: 0
From: Texas
to add to your question...enduringexplorer
Can someone give me a basic list IE...
1. airfilter
2. Fuel filter
of what to change on a 7.3 tune up?
-------------------------------------------
my input:
enduringexplorer get a chip tuner if you don't already have one! It is a HUGE differance if you don't already know.
1. airfilter
2. Fuel filter
of what to change on a 7.3 tune up?
-------------------------------------------
my input:
enduringexplorer get a chip tuner if you don't already have one! It is a HUGE differance if you don't already know.