2005 ram 1500 5.7 low idle misfire
Record Breaker
Joined: Sep 2007
Posts: 1,810
Likes: 105
From: PA
Hi guys,
Brand new to the forums here. Right off the bat here I should say that I am not mechanically knowledgeable but I have a couple of buddies who are and have been trying to help me with this issue. I just bought a 2005 ram 5.7 SLT 4x4 about 2 months ago. Here is what's happening:
- misfire code po301
- the only noticeable thing other than the check engine light being on, is that it idles slightly rough
- changed the spark plug wires, plugs and new fuel pump
- my friend swapped out the fuel injector with 1 and 3 to see if the code follows, and it did not.
- it still has really good power and anything out of idle position it seems to run great.
- you can definitely tell there is a misfire at idle though, just slightly rough, but once I start going it runs strong.
Were having a hard time figuring it out. I really want to get it fixed but just not sure what direction to go in. Any help and knowledge would be greatly appreciated.
Brand new to the forums here. Right off the bat here I should say that I am not mechanically knowledgeable but I have a couple of buddies who are and have been trying to help me with this issue. I just bought a 2005 ram 5.7 SLT 4x4 about 2 months ago. Here is what's happening:
- misfire code po301
- the only noticeable thing other than the check engine light being on, is that it idles slightly rough
- changed the spark plug wires, plugs and new fuel pump
- my friend swapped out the fuel injector with 1 and 3 to see if the code follows, and it did not.
- it still has really good power and anything out of idle position it seems to run great.
- you can definitely tell there is a misfire at idle though, just slightly rough, but once I start going it runs strong.
Were having a hard time figuring it out. I really want to get it fixed but just not sure what direction to go in. Any help and knowledge would be greatly appreciated.
Record Breaker
Joined: Sep 2007
Posts: 1,810
Likes: 105
From: PA
Low compression will cause a misfire. I'd go for that next. Pretty fast and easy to do a compression, or leak down test.
Thread Starter
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Registered User
Joined: Aug 2022
Posts: 7
Likes: 0
Thank you very much, all of you guys are awesome for your help. IfI can ask this, if it is a cracked or broken valve spring, wouldn't there be a more noticeable noise?
Record Breaker
Joined: Sep 2007
Posts: 1,810
Likes: 105
From: PA
Generally you'd hear something with a broken valve spring, but not always. Compression can be compromised for a number of reasons, might be a dropped a valve seat or head gasket issue - those things can happen if the engine was overheated. Best to do the quick and easy tests, rather than think of all the causes - rationalizing w/o data is a waste of time.