Help please, Misfire
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Registered User
Joined: Oct 2018
Posts: 16
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From: Allendale michigan
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Alright so, my 04 dodge ram 1500 5.7 Hemi quad cab with a colt air intake, intake manifold spacer on a remanufactured engine 4000 miles ago which is misfiring. I have took out the good ol code scanner. The original codes were system too rich and miss in cylinder 3. I checked sparks, wires and coils all checked out. Did a swap of everything to a different cylinder. Still had miss in 3. Two days later it went from miss in 3 to random miss. Now it has o2 high voltage and low voltage, random miss and every now and then rich system. I have checked egr, replaced crank sensor, checked injectors, checked all fuses and relays, spark, wires, coils, alternator, battery, throttle body, and all connectors to those items. Everything checked out. I am not sure where or what to check next. Also it all started when when cold driving and refused to shift into a higher gear then stalled out. Recallebrated throttle then started to miss.
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Joined: Apr 2010
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From: Clayton MI
Your O2's are likely original then, wouldn't hurt to change them. (pre cat sensors, don't worry about the post cat sensors.)
Easy test to see if they are the problem would be to simply unplug them, and see if it runs any better. (will set codes though.)
Easy test to see if they are the problem would be to simply unplug them, and see if it runs any better. (will set codes though.)
Thread Starter
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Registered User
Joined: Oct 2018
Posts: 16
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From: Allendale michigan
so the joys of owning a older truck is that all but one bolt on each side of the engine come off. Not sure how to get those tiny bolts off the cover.
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Registered User
Joined: Oct 2018
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From: Allendale michigan
so I simply pulled the connectors on both my pre cat o2's. Truck runs better but still throws miss in 3. So I am thinking o2 and something else combined is causing the issue
Thread Starter
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Registered User
Joined: Oct 2018
Posts: 16
Likes: 0
From: Allendale michigan
Alright so, my 04 dodge ram 1500 5.7 Hemi quad cab with a colt air intake, intake manifold spacer on a remanufactured engine 4000 miles ago which is misfiring. I have took out the good ol code scanner. The original codes were system too rich and miss in cylinder 3. I checked sparks, wires and coils all checked out. Did a swap of everything to a different cylinder. Still had miss in 3. Two days later it went from miss in 3 to random miss. Now it has o2 high voltage and low voltage, random miss and every now and then rich system. I have checked egr, replaced crank sensor, checked injectors, checked all fuses and relays, spark, wires, coils, alternator, battery, throttle body, and all connectors to those items. Everything checked out. I am not sure where or what to check next. Also it all started when when cold driving and refused to shift into a higher gear then stalled out. Recallebrated throttle then started to miss.
truck now only shows two codes p0174 and p0175 misfire went away a few days ago and has not shown up since.
truck now only shows two codes p0174 and p0175 misfire went away a few days ago and has not shown up since.