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2003 Dodge RAM 1500: it barely starts and idles very rough../tps..psi

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2003 Dodge RAM 1500 5.7l...
2003 Dodge RAM 1500 5.7l hemi All of a sudden it barely starts and idles very rough.
I have replaced plugs, electronic throttle housing w/TPS, checked fuel pressure (47 psi).
Not throwing any codes. What should I check next or any ideas?
Wanted to add that when you press on the accelerator it seems to run fine above 1800 rpm.
Sometimes when starting, I need to press the accelerator also.
Submitted: 7 years ago.Category: Dodge
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Answered in 6 minutes by:
2/11/2010
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
brownjeff
brownjeff, ASE Certified Technician
Category: Dodge
Satisfied Customers: 13,886
Experience: 17 years experience, ASE certified, dealership certified, Service Manager for 15 years,
Verified
You are describing a failing cam sensor or crank sensor. Until one fails they will test good so you have to wait until it fails or take a guess and replace one and hope for the best.
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Customer reply replied 7 years ago
I replaced the crank sensor and cam sensor and it did not change anything
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
You may have a catalytic converter plugging up. Try disconnecting the exhaust pipe in front of the converter and see if it runs any better.
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Customer reply replied 7 years ago
That appears to be difficult without cutting a pipe?
Any other ideas.
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
Any connection in front of the converter will work.....just loosen it
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Customer reply replied 7 years ago
Seriously? We are talking the bolts that connect to the exhaust manifold?
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
graphic
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Customer reply replied 7 years ago
What about just pulling the O2 sensor in the pipe in front of it?
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
You could try that. Not sure if that is a big enough leak or not but would be worth a try
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Customer reply replied 7 years ago
I will have to try that tomorrow.
Not to deviate from your thought, but could this be a vacuum leak problem?
What would I check? I have sprayed around the injectors and manifold with
no changes. Another hose or connection I could check?
Also, does the 03 have a Idle Air Control?

Thanks for your help so far. I will make sure you get paid no matter what.
Kind of at my wits end with this.
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
No it does not have a idle air control motor. Also a vacuum leak will not cause the problem you described
brownjeff
brownjeff, ASE Certified Technician
Category: Dodge
Satisfied Customers: 13,886
Experience: 17 years experience, ASE certified, dealership certified, Service Manager for 15 years,
Verified
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Customer reply replied 7 years ago
Jeff,

I have accepted the answer, but you should know the problem turned out to
be a broken spring on the intake valve on #5 cylinder. The intake was being held
open.
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
Thanks for the follow up......That is rare for one to break but it would certainly cause the problem
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Customer reply replied 7 years ago
Actually, after doing some research, that appears to be a common problem on the hemi's.
Both on 03's and 04's. They mention something called the "hemi tick" which can
appear at almost anytime.
Dodge Mechanic: brownjeff, ASE Certified Technician replied 7 years ago
Not sure I would call it common.......but anyway glad you got it figured out
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brownjeff
brownjeff
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