Howdy to all here on the DF.
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Joined: Jul 2022
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From: Seminole Florida
Howdy to all here on the DF.
My Baby: 2004 Dodge Dakota 3.7l quad cab:
Got truck @99k miles & was decently maintained by previous owner. About a year & a half ago @110k I replaced both valve cover gaskets, because of a leak passenger side & PVC valve & subsequent hoses and that stopped the oil leak totally & apparently helped the vacuum system seal up as well. Had a vacuum leak I am assuming (I hate that word) because it was running noticeably better although it didn't present any vacuum associated MIL codes. Drove from Florida to Kansas twice in 2021 without a hic-up. Being a mechanic of 8yrs with jet engines & propellers in the Navy, I am inclined to do most if not all my maintenance. I have found that one word (assuming) can spend you down a rabbit $$$ hole that has no end. OK I am digressing here sorry.
My Baby @130k miles
Started truck normal & sounded fine and I let it run a few minutes to warm & spread the oil, I never ever start a motor and go, I always let it run a few before engaging. Drove 1/2 miles or so & shut off went into the store. 20 minutes later I try to start & it sounded like it engaged the starter & cut out almost as fast as I heard the starter start & stop. I turned it over & I got it started after pushing gas pedal down quite a bit & I could tell somethings missing. Drove it home & started to do the eye & ear troubleshoot. Just listening to it sounded like it was missing on passengers side, either 2,4,6 cyl. performed code scan & the following codes presented themselves:
P0300 random miss/
P0302 #2 miss/
P2305 Ign Coil B 2ndary circuit
After researching the codes, here we go, I ((assumed) as I think most would when the scanner speaks) I had a bad coil packs &or plugs @cyl #2/#5.
So I went overkill for sure but I plan on keeping her, so I replaced all 6 plugs & 6 ign coil packs. Reset codes and restarted. Sounds the same, it's still missing & nothings changed much, well honestly maybe running a tiny bit noticeably better because of the new coils & plugs but it's still sounding like the original miss cyl's #2 or 4 or 6. I redid code scan and this time the only code to present:
P0113 Intake air temp sensor (assuming) Air intake disassembled to work on coils & plugs
STUMPED
Figured I better check the mechanical sound of the engine with out the fire to listen for mechanical failures. Listening for anything, a tap, tick, crunch, clunk or grinding or anything sounding abby normal, so I unplugged all coil packs. Turned over & fortunately for me, it sounds wonderful & fine turning over without the fire. Not a tap, tick or anything mechanically abby normal sounding. I plugged all coil packs back in and put air intake back together to start back to square one.
I reset code & I started motor and not a single code presents & yet it is still sounds like it's missing. I pulled one coil pack wire at a time restarted & immediately that MIL code for each of the corresponding cyl #'s 1-6 presented. I did this for each of the 6 cyl & wrote downs codes that presented & they correspond to each cyl unplugged. Clearing codes again & having everything plugged back in and air intake reinstalled. Restarted & it sounds like the original missing & no codes are presenting after coil pack & plug replacements. Not like its all that difficult to pull the valve cover on this engine but before I go all mechanical, I am searching out help because I really feel I am chasing a (elecTron) & I have seen some videos in the past but alas cant seem to find the ones about possibly noting other sensors possibly having something to do with the misfiring. Still looking & I have verified that I have spark at each coil pack but not the strength of said spark.
I am stumped.
Any & I mean any advice is deeply appreciated.
Got truck @99k miles & was decently maintained by previous owner. About a year & a half ago @110k I replaced both valve cover gaskets, because of a leak passenger side & PVC valve & subsequent hoses and that stopped the oil leak totally & apparently helped the vacuum system seal up as well. Had a vacuum leak I am assuming (I hate that word) because it was running noticeably better although it didn't present any vacuum associated MIL codes. Drove from Florida to Kansas twice in 2021 without a hic-up. Being a mechanic of 8yrs with jet engines & propellers in the Navy, I am inclined to do most if not all my maintenance. I have found that one word (assuming) can spend you down a rabbit $$$ hole that has no end. OK I am digressing here sorry.
My Baby @130k miles
Started truck normal & sounded fine and I let it run a few minutes to warm & spread the oil, I never ever start a motor and go, I always let it run a few before engaging. Drove 1/2 miles or so & shut off went into the store. 20 minutes later I try to start & it sounded like it engaged the starter & cut out almost as fast as I heard the starter start & stop. I turned it over & I got it started after pushing gas pedal down quite a bit & I could tell somethings missing. Drove it home & started to do the eye & ear troubleshoot. Just listening to it sounded like it was missing on passengers side, either 2,4,6 cyl. performed code scan & the following codes presented themselves:
P0300 random miss/
P0302 #2 miss/
P2305 Ign Coil B 2ndary circuit
After researching the codes, here we go, I ((assumed) as I think most would when the scanner speaks) I had a bad coil packs &or plugs @cyl #2/#5.
So I went overkill for sure but I plan on keeping her, so I replaced all 6 plugs & 6 ign coil packs. Reset codes and restarted. Sounds the same, it's still missing & nothings changed much, well honestly maybe running a tiny bit noticeably better because of the new coils & plugs but it's still sounding like the original miss cyl's #2 or 4 or 6. I redid code scan and this time the only code to present:
P0113 Intake air temp sensor (assuming) Air intake disassembled to work on coils & plugs
STUMPED
Figured I better check the mechanical sound of the engine with out the fire to listen for mechanical failures. Listening for anything, a tap, tick, crunch, clunk or grinding or anything sounding abby normal, so I unplugged all coil packs. Turned over & fortunately for me, it sounds wonderful & fine turning over without the fire. Not a tap, tick or anything mechanically abby normal sounding. I plugged all coil packs back in and put air intake back together to start back to square one.
I reset code & I started motor and not a single code presents & yet it is still sounds like it's missing. I pulled one coil pack wire at a time restarted & immediately that MIL code for each of the corresponding cyl #'s 1-6 presented. I did this for each of the 6 cyl & wrote downs codes that presented & they correspond to each cyl unplugged. Clearing codes again & having everything plugged back in and air intake reinstalled. Restarted & it sounds like the original missing & no codes are presenting after coil pack & plug replacements. Not like its all that difficult to pull the valve cover on this engine but before I go all mechanical, I am searching out help because I really feel I am chasing a (elecTron) & I have seen some videos in the past but alas cant seem to find the ones about possibly noting other sensors possibly having something to do with the misfiring. Still looking & I have verified that I have spark at each coil pack but not the strength of said spark.
I am stumped.
Any & I mean any advice is deeply appreciated.
Last edited by JD33772; Jul 28, 2022 at 10:56 PM. Reason: Clarity
Thread Starter
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Amateur
Joined: Jul 2022
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From: Seminole Florida
P2305 ignition coil b secondary circuit
I plan on keeping the vehicle so at 130,000 miles I just went ahead and I replaced all the coils and all the spark plugs feels like it's running differently but still sounds the same like it's misfiring like it was originally. After resetting the codes and restarting the vehicle that particular code pops up P2305. After running it for about 2 to 3 minutes I turned it off. Reread the codes now I'm getting a 0113 air intake code also and I'm under the assumption that since I have the air cleaner off of the vehicle to work on it that's why that code presents itself. The other codes p300 & p302 are not presenting themselves again however I have only restarted and ran it once for a few minutes. I will restart and see if those codes come back I'm just perplexed now at what conditions will present that code?
And thank you for responding 😇p
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Amateur
Joined: Jul 2022
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From: Seminole Florida
Thread Starter
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Amateur
Joined: Jul 2022
Posts: 26
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From: Seminole Florida
Yes
After replacing all the coil packs and all the spark plugs I did code reset. Wanted to start fresh. Now it is still missing like it was before and now I have the p2305 code along with the 0113 code which is an air cleaner code and I'm assuming that since I have that off that is why that code is set. The original codes 0300 and 0302 are no longer presenting themselves the only ones that presents now are the ones that I stated 2305 and 0113.
Finally after 8 days straight at work I've got some time to put in on it besides researching which I still haven't found anything outside of ignition coils and plugs for the 2305 to present itself. I'm perplexed
Finally after 8 days straight at work I've got some time to put in on it besides researching which I still haven't found anything outside of ignition coils and plugs for the 2305 to present itself. I'm perplexed
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Amateur
Joined: Jul 2022
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From: Seminole Florida
yes, after I replaced all the coils and plugs, I did the reset & started. unfortunately still missing & now I am not getting any codes to aim me in the right direction. By chance is there a number of starts after a reset of the codes to present a code for a condition? just wondering if i need to start it up a few more times to see if a code will present.
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From: Clayton MI
For misfire codes and such, it has to happen some number of times, before it will set a hard code. There might be pending codes, but, need a pretty high zoot reader to get those. I know on my truck, it apparently didn't care about misfires, as I had a DEAD cylinder (plug wire burnt in half....) and never got a code, or any indication there was a problem......
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From: Seminole Florida
I hate chasing Tron.
I will give her a few more starts to see if a code pending or stored will present.
I will have to figure out how to check the power coming to the coil packs.
Had someone mention a crankshaft sensor or a cam shaft sensor I'll have to ask him again. Not sure they have anything to do with the code P2305 as that was the last code presented before the reset.
thanks again for your helpc
I will give her a few more starts to see if a code pending or stored will present.
I will have to figure out how to check the power coming to the coil packs.
Had someone mention a crankshaft sensor or a cam shaft sensor I'll have to ask him again. Not sure they have anything to do with the code P2305 as that was the last code presented before the reset.
thanks again for your helpc
Thread Starter
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Amateur
Joined: Jul 2022
Posts: 26
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From: Seminole Florida
Any help or ideas
I would ignore any codes you get while testing..... Not sure what criterion the PCM uses for misfire codes, but, on my truck, I had a dead miss on one cylinder, as the plug wire was in two pieces..... and it never set a code.... Cylinder 2 seems to be your problem child though. If you hadn't replaced all the coils, I would be tempted to swap 2 and 4, and see if the misfire moves with the coil. Might try it anyway.