Vaccum Leaks
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 75
Likes: 0
Vaccum Leaks
i have a 99 F150 4x4, 4.6L w/128,000. It has had a miss in it whenever at a stop (either in park or in gear, more so in gear). It finally threw and Air Metering code last week and i replaced the MAF. It idled so smooth after the install. But this morning the miss was back. Not as bad as before, but it was there. The plugs and wires are about 1.5-2 yrs old. I was just woundering about checking for VACCUM LEAKS. Where are All the VACCUM LINES at that should be checked. AND are there other AREAS other than Vaccum Lines that should be check as well.
About a month ago, my MPG took about a 3-4 mpg decline. this is city driving and i used to get around 15, but not it is around 12. and ideas...thanks guys.
About a month ago, my MPG took about a 3-4 mpg decline. this is city driving and i used to get around 15, but not it is around 12. and ideas...thanks guys.
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 75
Likes: 0
i hooked a timing light to the plug wires to check the sparks and not all of them sparked at the same speed.. some were faster than others. is this normal. if not, is it a plug problem? or wire or coil pack problem? or something else that i would rather not know about...if anyone has any ideas, lets hear them...thanks guys
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
Is the CEL still on? What is/was the DTC that you got? With what you said about the timing light, I would be suspicious of the spark plug wires or even the coil packs. When you changed the plugs/wires before, what brand parts did you use? It may be time to do this again. As for vacuum leaks, there is a elbow at the rear of the intake manifold that I have read about rotting through and causing problems. I don't remember the details of the associated symptoms with it. Good Luck! 
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 75
Likes: 0
the last dtc was an air metering problem so i replaced the maf..i used autolite plugs the last time...i dont remember what wires i used...what type should i use for the wires..from what i have read i need to use motorcraft plugs...what is the life exptantcy of the coil packs.
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
What is the actual DTC number?
These trucks in many cases seem to be partial to Motorcraft parts for plugs and wires. The heat in the engine compartment as well as the voltages that are generated can wear a coil out. There is no rule of thumb that I am aware of on coil life expectancy.
These trucks in many cases seem to be partial to Motorcraft parts for plugs and wires. The heat in the engine compartment as well as the voltages that are generated can wear a coil out. There is no rule of thumb that I am aware of on coil life expectancy.
FTE Sponsor
Joined: Aug 2006
Posts: 755
Likes: 0
Coil Packs
Originally Posted by cneagle87
i have a 99 F150 4x4, 4.6L w/128,000. It has had a miss in it whenever at a stop (either in park or in gear, more so in gear). It finally threw and Air Metering code last week and i replaced the MAF. It idled so smooth after the install. But this morning the miss was back. Not as bad as before, but it was there. The plugs and wires are about 1.5-2 yrs old. I was just woundering about checking for VACCUM LEAKS. Where are All the VACCUM LINES at that should be checked. AND are there other AREAS other than Vaccum Lines that should be check as well.
About a month ago, my MPG took about a 3-4 mpg decline. this is city driving and i used to get around 15, but not it is around 12. and ideas...thanks guys.
About a month ago, my MPG took about a 3-4 mpg decline. this is city driving and i used to get around 15, but not it is around 12. and ideas...thanks guys.
http://www.performancedistributors.c...50ignition.htm
__________________
FTE Sponsor
Performance Distributors
www.PerformanceDistributors.com
FTE Sponsor
Performance Distributors
www.PerformanceDistributors.com
Thread Starter
|
Junior User
Joined: Oct 2005
Posts: 75
Likes: 0
i am not sure what the exact code number was, but it did say "Air Metering". something along the lines of faulty or bad air metering i think...but it went off a day or two later, but i still replaced the maf. it has thrown a code saying that "bank one was too lean"..and i went through the whole egr deal with it as well.. changed the valve, dpfe sensor, but the ports were clogged up. but i never really could tell a difference in performance after fixing that problem..it has done this for a long time...but hopefully ill figure out one day how to make this thing run and idle as smooth as it should...
Trending Topics
Post Fiend
Joined: Jun 2005
Posts: 7,047
Likes: 2
From: North west La
Check the pcv line at the manfold. The elbow there is bad about rotting & causing a leak. I had a vacumm leak on my truck behind the battery. It was hard to find & it was causing my air vents to go to defrost when I put my truck under a load. It was a split in a hard line where it went through the dash.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
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