Fuel injector change
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Freshman User
Joined: Sep 2012
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From: Elkridge, Maryland
Fuel injector change
Hope everyone had a great Thanksgiving!
I have a P0310 that won't go away. I've ensured the fuel injector clip is nice and tight, changed the plug and swapped the COP. Now I want to swap the injector with another to try and rule it out or determine that it's the culprit. I read up a little on it and was wondering if I really have to remove the entire fuel supply rail to swap them out or if there's an easier way to swap two from the same side?
I have a P0310 that won't go away. I've ensured the fuel injector clip is nice and tight, changed the plug and swapped the COP. Now I want to swap the injector with another to try and rule it out or determine that it's the culprit. I read up a little on it and was wondering if I really have to remove the entire fuel supply rail to swap them out or if there's an easier way to swap two from the same side?
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Freshman User
Joined: Sep 2012
Posts: 34
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From: Elkridge, Maryland
Alrighty then... Installed a brand new injector in the #10 spot, that was a PITA. Put 30 or so miles on it and checked for codes again...P0300 and P0310 (Random misfire and Cylinder #10 misfire detected, respectively) what gives?? Does anyone know if you can use a multimeter to check the power into the injector or do you have to use an o'scope because it happens too fast for a multimeter? Also, what should I see when checking the signal/power to said injector?
Laughing Gas
Joined: May 2008
Posts: 939
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From: Central Kansas
What year truck is this? I'm going to give you a bump back to the top b/c I'm not sure what else could cause a miss on just one cylinder if you've replaced the plug, COP, and injector. Do you have a scanner to check the fuel trims?
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Freshman User
Joined: Sep 2012
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From: Elkridge, Maryland
Sorry about that, I keeping meaning to add a signature with that in it. She's a 99 F250 SD V10 EC 4x4, her name's Ayn.
I do have a scanner (INNOVA 3100a) and started a thread in the V10 engine forum with questions about the STFT/LTFT which seems to have cleared up and evolved into this thread. I can check in a bit to see where they're at. At a Boy Scout meeting last night a friend suggested that maybe a valve is fouled/partially fouled and not seating correctly which might be throwing the gas/air ratio off causing the misfire? IDK, possible?? I'm picking up a 'noid light tomorrow ($15 at Advanced Auto) to make sure the injector is getting powered right and check the wiring.
I do have a scanner (INNOVA 3100a) and started a thread in the V10 engine forum with questions about the STFT/LTFT which seems to have cleared up and evolved into this thread. I can check in a bit to see where they're at. At a Boy Scout meeting last night a friend suggested that maybe a valve is fouled/partially fouled and not seating correctly which might be throwing the gas/air ratio off causing the misfire? IDK, possible?? I'm picking up a 'noid light tomorrow ($15 at Advanced Auto) to make sure the injector is getting powered right and check the wiring.
FTE Leadership Emeritus
Joined: Sep 2000
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From: Stephensville WI
Another silly question, but did you also change the boot on #10? Did you swap the COP to another cylinder to see if the problem stays on #10 or follows the COP?
Otherwise, a vacuum leak that is specific to the #10 hole would cause a lean condition and a misfire. Check the intake port and everything around the manifold, plus the manifold itself, for leaks.
A good way to check the manifold/head seal is with a propane torch. Turn it on (but don't light it) and move it around the intake/head mating area while the engine is idling. If you hear the idle change, you found your vacuum leak.
Otherwise, a vacuum leak that is specific to the #10 hole would cause a lean condition and a misfire. Check the intake port and everything around the manifold, plus the manifold itself, for leaks.
A good way to check the manifold/head seal is with a propane torch. Turn it on (but don't light it) and move it around the intake/head mating area while the engine is idling. If you hear the idle change, you found your vacuum leak.
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Joined: Sep 2012
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From: Elkridge, Maryland
I did swap the COP, boot and all with #6 and the problem didn't move. I'll borrow a propane torch from a friend and try around the intake like you suggested if the 'niod light shows good. Which, with my luck, probably will and I'll have to tear the intake manifold apart and install a new gasket or something. I really appreciate all suggestions and help.
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Joined: Sep 2012
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From: Elkridge, Maryland
So things aren't quite going my way (as usual). Advanced doesn't have 'noid lights in stock, I'd have to order them and my friend with the torch is incommunicado. I also noticed that when I get on it (WOT) it surges a bit, enough to feel but not enough to make me look like a headbanger at a Metallica concert. Any ideas on that?
And the P0310 remains...
And the P0310 remains...
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