300 Six Attitude problem
Thread Starter
|
Freshman User
Joined: Jul 2003
Posts: 29
Likes: 0
300 Six Attitude problem
there aren't any codes on it. that's why I'm lost. it surges about 1200 rpm. when i start it up, it will rev up to about 1500 and then drop down to just about 300 or 400. it will do this for about 15-30 sec. and then idle rough at around 500 rpm.
Posting Guru
Joined: Dec 2002
Posts: 1,428
Likes: 0
From: peoria, az
300 Six Attitude problem
There must meet certain criteria before they will set a code.They either have to be stuck on one end or the other or they have to be stuck in the middle and not switching. This is why mechanics make the big bucks. Sometimes you have to give it your best guess and sometimes you have to substitute a "known good part" (that could get expensive)
Posting Guru
Joined: Dec 2002
Posts: 1,428
Likes: 0
From: peoria, az
300 Six Attitude problem
that should cover it. Youv'e been everywhere else already. Can't think of anything else that would do that.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
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
Thread Starter
|
Freshman User
Joined: Jul 2003
Posts: 29
Likes: 0
300 Six Attitude problem
The only other thing that I can think of has to do with the the engines compression. I know that it's low, and I know that compression effects vacuum. Since it's running rich I think that it's because I'm not pulling in as much air as I'm supposed to.
Posting Guru
Joined: Dec 2002
Posts: 1,428
Likes: 0
From: peoria, az
300 Six Attitude problem
I lost my page.(long story) How low of compression are we talking? Have you tried to put a vacuum gage on it to see what it actually is? Somebody said something about EGR dumping too much a while back. That might be worth looking into. Pull the hose off the valve and see if it has vacuum when cold or when at idle. It shouldn't have any. I know but it only takes a couple of seconds to check it.
Thread Starter
|
Freshman User
Joined: Jul 2003
Posts: 29
Likes: 0
300 Six Attitude problem
I can't remember what it actually is (I wrote it down and can't find it) but I think they are arround 100psi give or take 15psi. the vacuum was low, (again can't really remember). I had replaced the EGR a while back. and there isn't any vacuum to it when I start it up. and when I did a wet test it really didn't pull them up but about 15 or 20 psi.
Senior User
Joined: Jul 2003
Posts: 318
Likes: 0
From: North of Toronto, Ontario
300 Six Attitude problem
First of all, this engine doesn't have a MAF sensor to sense air. Just wanted to point that out. Second, the idea of the engine running rich suddenly came about. How do you know that it's running rich? Third, if you read back near the top you will see that a MAP sensor was mentioned. These sensors will cause some serious concerns with the way your engine runs, without going out of range to cause a computer code. The same is true for O2 sensors and ignition modules. There three items go "**** up" on ford vehicles often, causing a lot of problems, without going out of the allowed range and giving a computer code. Someone said that it sounds like a bad O2 sensor. Myself, I would try that and/or a MAP sensor.
New User
Joined: Sep 2003
Posts: 20
Likes: 0
300 Six Attitude problem
Only reason I mentioned a maf is that is the fuel injection setup I am most familiar with. My personal experience with the 300 has been the carburated engine, so I wasn't sure how the fuel injected version was set up. 