2005 Dodge Ram engine gets hot and # 5 cly misfires

GATORM4

MEMBER
2005 DODGE RAM
V8
4WD
AUTOMATIC
83,000 MILES

I have replaced thermostat and waterpump but truck is
still running hot. After driving several miles after parking
overnight goes into overflow tank but does not draw back
into radiator. I have to add coolant each time it is driven.
What else do I need to replace to correct this problem?
Engine light came on, had it checked at Auto Zone and
code showed #5 cylinder misfiring, there is no sign of water in oil. Any suggestions will be appreciated.

11 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,

Thank You for the donation,

have the pressure cap tested as if it is faulty you will not drew back into the radiator, also pressure check for any external leaks, check for a faulty plug & lead or coil if COP system, also any local vacuum leak around No 5 cyl.

Mark (mhpautos)

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Thursday, September 2nd, 2010 AT 1:10 AM

GATORM4

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11 POSTS

Got a new cap still goes into overflow tank after driving

but still not going back into the radiator

will check the pug and wire and for vacuum leak
how do you check the coil to see if it is bad

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Friday, September 3rd, 2010 AT 9:14 AM

MHPAUTOS

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Hi there,

if the coolant will not draw back into the system with a new cap, there will be a small leaks somewhere as when the system is cooling it creates a partial vacuum which causes atmospheric pressure action on the head of coolant to flow back into the system, with no partial vacuum, pressures are equal and you get no flow, do you own and know how to read a multimeter for the coil tests?

Mark (mhpautos)

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Friday, September 3rd, 2010 AT 9:39 AM

GATORM4

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Yes I know how to read a mulimeter. In be a small leak

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Sunday, September 5th, 2010 AT 1:34 PM

MHPAUTOS

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https://www.2carpros.com/topics/electrical/coil-pack

Mark (mhpautos)

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Sunday, September 5th, 2010 AT 6:47 PM

GATORM4

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Do you check coil pack the same way.

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Monday, September 6th, 2010 AT 12:26 AM

MHPAUTOS

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I will look for the specific test for the coil pack, sorry should of realized that.

Mark

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Monday, September 6th, 2010 AT 2:24 AM

GATORM4

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11 POSTS

Engine is running rough took auto zone and had check
now 3 cly and 5 cly misfiring

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Monday, September 6th, 2010 AT 7:13 PM

MHPAUTOS

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I will require a specific model & engine size as Dodge Ram is not info for detailed searching.

Mark (mhpautos)

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Monday, September 6th, 2010 AT 7:34 PM

GATORM4

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11 POSTS

I have run compression check on all cyls. All have 150lbs
except no. 3 is 120lbs. Ran computer chk shows 3 - 5 cyl
misfiring but have changed plugs on all eight and cleared
check eng light code and now no. 3 is still misfiring. Have
changed coils, moved no 3 to no.1 and 1 to 3 hoping it was a coil, clleared check eng code again, and no. 3 is
still misfiring. A brand new pluig is black, does this mean
cyl too rich? At loss for what to do now. Any suggestions?

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Thursday, September 9th, 2010 AT 9:16 PM

MHPAUTOS

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Either you have a faulty injector or the low comp is causing you a problem, do a wet comp test to see if it is rings or a valve causing the lower compression.

Mark (mhpautos)

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Friday, September 10th, 2010 AT 2:23 AM