2005 Dodge Ram engine gets hot and # 5 cly misfires

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)

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

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)

yes i know how to read a mulimeter. in be a small leak

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

Mark (mhpautos)

do you check coil pack the same way.

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

mark

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

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

mark (mhpautos)

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?

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)