Fuel injectors
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Cross-Country
Joined: Oct 2008
Posts: 81
Likes: 5
Fuel injectors
I replaced fuel injectors this weekend because I kept getting a random cyl 4 misfire. I had just replaced sparkplug with Motorcraft platinum SP479. Engine would occasionally stumble. I bought Bosch injectors at Autozone, truck runs like crap. Will barely idle. What is the best brand injectors without paying 600.00 for Motorcraft?
Hotshot
Joined: Jul 2020
Posts: 10,359
Likes: 2,594
From: Near Salt Lake City
Bosch used to make the Ford ones
I look and find the Motorcraft ones on ebay cheap as a set
You may have a different problem?
I would not jump on replacing the injectors again (yet)
You did not say what vehicle you are driving but,
Check the fuel pressure and clear / recheck the codes
I look and find the Motorcraft ones on ebay cheap as a set
You may have a different problem?
I would not jump on replacing the injectors again (yet)
You did not say what vehicle you are driving but,
Check the fuel pressure and clear / recheck the codes
Hotshot
Joined: Jul 2020
Posts: 10,359
Likes: 2,594
From: Near Salt Lake City
Okay great So 2000 5.4 has a coil on plug setup
Have you swapped the #4 coil with say #3 to verify it is not the coil at fault?
Did you replace the coil boots?
I agree injectors would be next after the coil swap
How many miles? Some get camshaft follower / rocker arm roller tip failure which causes a miss
Hopefully a coil or something cheap fixes yours
Have you checked for an intake manifold vacuum leak around cylinder 4?
Have you swapped the #4 coil with say #3 to verify it is not the coil at fault?
Did you replace the coil boots?
I agree injectors would be next after the coil swap
How many miles? Some get camshaft follower / rocker arm roller tip failure which causes a miss
Hopefully a coil or something cheap fixes yours
Have you checked for an intake manifold vacuum leak around cylinder 4?
Moderator
Joined: Aug 2002
Posts: 6,099
Likes: 380
From: Southern California
I replaced fuel injectors this weekend because I kept getting a random cyl 4 misfire. I had just replaced sparkplug with Motorcraft platinum SP479. Engine would occasionally stumble. I bought Bosch injectors at Autozone, truck runs like crap. Will barely idle. What is the best brand injectors without paying 600.00 for Motorcraft?
Lead Driver
Joined: Sep 2002
Posts: 9,500
Likes: 2,021
From: North Texas
Mail original set out for service. Injector Rx did mine last year for Lobo and the Mexpedition. Ran about $200 shipped for all eight.
Interesting on camshaft lifter/rocker. My Lobo 5.4 had the intake rocker off on No 4. Replaced rocker and lifter, still have miss there. Next test for me is compression then leakdown.
Interesting on camshaft lifter/rocker. My Lobo 5.4 had the intake rocker off on No 4. Replaced rocker and lifter, still have miss there. Next test for me is compression then leakdown.
Thread Starter
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Cross-Country
Joined: Oct 2008
Posts: 81
Likes: 5
Okay great So 2000 5.4 has a coil on plug setup
Have you swapped the #4 coil with say #3 to verify it is not the coil at fault?
Did you replace the coil boots?
I agree injectors would be next after the coil swap
How many miles? Some get camshaft follower / rocker arm roller tip failure which causes a miss
Hopefully a coil or something cheap fixes yours
Have you checked for an intake manifold vacuum leak around cylinder 4?
Have you swapped the #4 coil with say #3 to verify it is not the coil at fault?
Did you replace the coil boots?
I agree injectors would be next after the coil swap
How many miles? Some get camshaft follower / rocker arm roller tip failure which causes a miss
Hopefully a coil or something cheap fixes yours
Have you checked for an intake manifold vacuum leak around cylinder 4?
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Hotshot
Joined: Jul 2020
Posts: 10,359
Likes: 2,594
From: Near Salt Lake City
Okay then, back to the spark plugs, injectors and coil boots
Did you replace the boot on 4?
You replaced the injectors just for the # 4 miss right?
So, other than painstakingly swapping the 4 injector with another one for an additional test
I'd be looking at the plug real close
Especially if it takes several days for the miss to show up
Your engine may be letting some coolant past the head gasket and fouling the plug
Has the coolant been going down much in the tank?
Better pull the valve cover and watch the valves actuate / inspect the cams? Again?
I've seen heads crack and other problems with 5.4's
Not common
Did you replace the boot on 4?
You replaced the injectors just for the # 4 miss right?
So, other than painstakingly swapping the 4 injector with another one for an additional test
I'd be looking at the plug real close
Especially if it takes several days for the miss to show up
Your engine may be letting some coolant past the head gasket and fouling the plug
Has the coolant been going down much in the tank?
Better pull the valve cover and watch the valves actuate / inspect the cams? Again?
I've seen heads crack and other problems with 5.4's
Not common
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