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dood
User
Nov 30, 2012, 5:52 PM
Post #1 of 8
(3322 views)
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2003 dodge ram 2500
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5.7L hemi. really rough idle. all new coils and plugs.
I heard a vacuum leak can cause a rough idle, my steal vacuum line from tank to evap canister is rusted out. will this cause truck to idle bad?
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 30, 2012, 6:23 PM
Post #2 of 8
(3300 views)
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Re: 2003 dodge ram 2500
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There is a vacuum line that goes to the leak detection pump. The lines from the canister to the tank are vapor lines. Normally a vapor line problem won't cause an engine problem, but the vacuum line to the leak detection pump could cause a problem. Fix the line and see if the problem goes away.
I am sure the check engine light is on, but are there any other codes besides the one(s) for the EVAP system?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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C0nfused
New User
Nov 30, 2012, 7:24 PM
Post #3 of 8
(3280 views)
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Re: 2003 dodge ram 2500
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its throwing a "random misfire" and a "bank1 02 sensor high voltage." the idle spikes from 500 about to stall to 1200. i saw what could cause random misfire so i replaced all 8 coils and plugs, battery is good so the only thing left is a vacuum leak, a tleast thats what was recommended.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 30, 2012, 7:28 PM
Post #4 of 8
(3275 views)
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Re: 2003 dodge ram 2500
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Well, you should repair the EVAP line, which ever it is. Then you may need to find a shop that has a smoke machine to find any other vacuum leaks.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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C0nfused
New User
Nov 30, 2012, 7:34 PM
Post #5 of 8
(3273 views)
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Re: 2003 dodge ram 2500
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does the old carb spray trick still work? spraying over lines and see if engine revs? or will that damage something.
off topic, how is me calling someone with bad advice a "backyard mechanic" a banable offense? or does that offend the little ones around here.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 30, 2012, 7:46 PM
Post #6 of 8
(3263 views)
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Re: 2003 dodge ram 2500
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The carb spray trick does work, but since the idle speed is controlled by the PCM, it can compensate. I believe on the Dodge you can unplug the idle speed motor, so the PCM can't adjust the idle speed. Makes determining when you hit a leak, easier. Some leaks may be hard to get to with a can of spray. You also run the chance of the stuff catching on fire when it gets on something hot. I have found the smoke machine makes finding vacuum leaks so much easier because the engine isn't running and blowing air all over the place and it is visually picked up.
A lot of people on here devote a lot of time trying to help other people. People do get frustrated because they want to help someone, but there isn't enough information to go on some of the time. It's difficult working with DIY because they might not know the lingo or have the tools or knowledge on how to troubleshoot some of these problems. With so many people coming and going there is going to be clashes every once in a while. Some of the people on here are professional technicians and shop owners and take offense to being called backyard mechanics. That's like a slap in the face.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 30, 2012, 7:49 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 30, 2012, 7:56 PM
Post #7 of 8
(3258 views)
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Re: 2003 dodge ram 2500
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You can also try HT's favorite, "Scotty Kilmer's method of finding a vacuum leak with a cigar". LOL sorry it's Friday and happy to be able to sleep in tomorrow morning
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 30, 2012, 8:28 PM
Post #8 of 8
(3251 views)
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Re: 2003 dodge ram 2500
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Creating alternate user names after being banned is also a ban-able offense.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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