Fuel injector #2 pulse stops after 10 seconds
Thread Starter
|
Freshman User
Joined: Dec 2012
Posts: 34
Likes: 0
Fuel injector #2 pulse stops after 10 seconds
Been chasing a misfire in cylinder #2 for a couple days now. Coil is good, injector is good. Determined with a noid light this morning that the wiring harness stops delivering a pulse to injector #2 after 10 seconds from start-up. I've reset the computer and get the same issue. Any suggestions why this might occur?
Fleet Owner
Joined: Apr 2008
Posts: 24,319
Likes: 5,128
From: 0,0,1
Sounds like the ECM driver for that injector is fried and you need a new ECM.
Thread Starter
|
Freshman User
Joined: Dec 2012
Posts: 34
Likes: 0
Is there a way to test the ECM? Would there be any other reason that only one injector pulse would stop after 10 seconds?
Fleet Owner
Joined: Apr 2008
Posts: 24,319
Likes: 5,128
From: 0,0,1
If it cut out and back in intermittently I would say a loose wire connection. But since it happens 10 seconds after start-up it is an electronics issue. That's why I suspect the ECM as being the problem.
Senior User
Joined: Sep 2011
Posts: 448
Likes: 1
I believe the pcm will turn off the injector to the misfiring cylinder when it detects it, I would make sure connectors to the injector prongs is good, coil connector has good connection, and a good plug, then compression test. just a suggestion
Thread Starter
|
Freshman User
Joined: Dec 2012
Posts: 34
Likes: 0
I'm having a heck of a time trying to get the compression tester to screw into the plug hole. Using a Harbor Freight model which could be part of the problem. I've tried screwing it into the blown 5.4L sitting on my garage floor and on the replacement engine bolted in the truck but without luck getting the threads to take.
Trending Topics
Thread Starter
|
Freshman User
Joined: Dec 2012
Posts: 34
Likes: 0
Does the computer come out through the engine bay side, or from the inside of the car?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Fleet Owner
Joined: Apr 2008
Posts: 24,319
Likes: 5,128
From: 0,0,1
Even if that is the case, there would first have to be misfire and a rich exhaust codes set which there isn't.
Senior User
Joined: Sep 2011
Posts: 448
Likes: 1
Shop Manual for Automotive Fuels and Emissions - Barry Hollembeak - Google Books
This might help explain why
This might help explain why
Thread Starter
|
Freshman User
Joined: Dec 2012
Posts: 34
Likes: 0
So would a Type A misfire always cause the check engine light to come on? Once this type of misfire is detected will it cause the injector to shut down immediately at startup rather than 10 seconds after?
Fleet Owner
Joined: Apr 2008
Posts: 24,319
Likes: 5,128
From: 0,0,1
It will cause the CEL to flash. Once the flashing starts, the ECM shuts down the injector and monitors the result. Depending on what the ECM sees next, it will either stop flashing the CEL or turn it on steady. In either case, you have not said that your CEL has flashed or that is on steady. That being the case, the injector is not being purposely turned off by the ECM due to a misfire. This brings us back to a failing ECM output driver for that injector.
Thread Starter
|
Freshman User
Joined: Dec 2012
Posts: 34
Likes: 0
It will cause the CEL to flash. Once the flashing starts, the ECM shuts down the injector and monitors the result. Depending on what the ECM sees next, it will either stop flashing the CEL or turn it on steady. In either case, you have not said that your CEL has flashed or that is on steady. That being the case, the injector is not being purposely turned off by the ECM due to a misfire. This brings us back to a failing ECM output driver for that injector.
Fleet Owner
Joined: Apr 2008
Posts: 24,319
Likes: 5,128
From: 0,0,1
As long as the numbers match you should be able to just plug it in and go.