DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum

Go Back   DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum > Dodge Ram Forum - Help Zone - Dodge Ram Problems, Complaints, & Solutions - Maintenance & Re > 3RD Generation Dodge Ram 2002 to 2008 Dodge Ram Trucks > Powertrain > 4.7L PowerTech V8 Specific Topics


Notices


Latest Vendor News
AutoAnything
Addictive Desert Designs!
United Radio
Bayou Goat Mounts

Reply
 
Thread Tools
  #1  
Old 07-28-2013, 03:50 AM
andrew93's Avatar
andrew93 andrew93 is offline
Dodge Ram Forum Newcomer
 
Join Date: Dec 2012
Location: Euless tx
Age: 21
Posts: 13
Gender: Male
Vehicle: 2002 ram
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
andrew93 is on a distinguished road
Default 02 4.7 rought idles dies

I just bought a 02 ram with a 4.7 had a blown head gasket and 3 valve seats dropped valve barley touched the top of the pistons also cylinder walls looked very good not scratches or marks. Took the heads to the machine shop and got them fixed them put the new head gasket and everything back together timing set right. Now my problem is the truck wont idle shakes and truck will not start unless i hold the gas to the floor also have a tapping/knocking noise under the intake. Any ideas would be great also im only getting 1 code and it is P1491 getting pretty frustrated with the truck.
Reply With Quote
Sponsored links
  #2  
Old 07-28-2013, 03:51 AM
RogerRamJet's Avatar
RogerRamJet RogerRamJet is offline
God Bless Texas!




 
Join Date: May 2013
Location: Mansfield, TX
Age: 50
Posts: 11,525
Gender: Male
Vehicle: 2005 Ram 1500
Trim Level: Lonestar QC
Color: White
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 12
Rep:2929
RogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond reputeRogerRamJet has a reputation beyond repute
Default

Hey Andrew. Sounds to me like you've got a vacuum leak. I'd check all your vacuum hoses first.
__________________
Life is hard... It's harder if you're stupid!
Today is a good day to be a RAM owner!
Reply With Quote
  #3  
Old 07-28-2013, 03:59 AM
andrew93's Avatar
andrew93 andrew93 is offline
Dodge Ram Forum Newcomer
 
Join Date: Dec 2012
Location: Euless tx
Age: 21
Posts: 13
Gender: Male
Vehicle: 2002 ram
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
andrew93 is on a distinguished road
Default

ive checked the vacuum lines i can see and all good but could be missing one ive had a few of these 4.7's and one i had to do timing on and it was a tooth off had a slight miss. So i triple checked the timing on this truck and it looked dead on and i would think if it was more them 2 or 3 teeth off the valves would be hitting the heads i could be wrong?
Reply With Quote
  #4  
Old 07-29-2013, 05:01 PM
andrew93's Avatar
andrew93 andrew93 is offline
Dodge Ram Forum Newcomer
 
Join Date: Dec 2012
Location: Euless tx
Age: 21
Posts: 13
Gender: Male
Vehicle: 2002 ram
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
andrew93 is on a distinguished road
Default

Anyone else have any Ideas?
Reply With Quote
  #5  
Old 07-29-2013, 05:40 PM
deanhinsley1963's Avatar
deanhinsley1963 deanhinsley1963 is offline
Dodge Ram Forum Junior Member
 
Join Date: Jun 2013
Location: Hugo,OK.
Age: 51
Posts: 36
Gender: Male
Vehicle: 2004 Dodge Ram 1500
Trim Level: slt
Color: silver
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:12
deanhinsley1963 is on a distinguished road
Default

Maybe do a compression test and see where your at.
Reply With Quote
  #6  
Old 07-29-2013, 09:30 PM
andrew93's Avatar
andrew93 andrew93 is offline
Dodge Ram Forum Newcomer
 
Join Date: Dec 2012
Location: Euless tx
Age: 21
Posts: 13
Gender: Male
Vehicle: 2002 ram
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
andrew93 is on a distinguished road
Default

ok rented a compression tester from autozone im getting around 60 and 80 psi and on the cylinder on the driver side first one from the front is reading 0 when i had the heads off getting done at the machine shop the cylinders looked great still had the factory marks on them theres no oil and not smoking or anything
Reply With Quote
  #7  
Old 07-29-2013, 10:13 PM
mb power wagon's Avatar
mb power wagon mb power wagon is offline
Dodge Ram Forum Senior Member!
 
Join Date: Mar 2013
Location: manitoba
Posts: 360
Gender: Male
Vehicle: 2007 dodge power wagon
Trim Level: power wagon
Color: black
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
Rep Power: 0
Rep:68
mb power wagon will become famous soon enough
Default

if your getting a cylinder thats reading 0 on the compression tester you have a dead cylinder. also for the knocking under the intake double check to make sure you have all the push rods in the lifters. if i were you i'd pull the intake to see whats knocking and make sure all the rocker arms are moving before reinstalling the intake. it's a pain in the ass but you don't want to destroy the rest of the engine.
__________________
Reply With Quote
  #8  
Old 07-29-2013, 11:29 PM
andrew93's Avatar
andrew93 andrew93 is offline
Dodge Ram Forum Newcomer
 
Join Date: Dec 2012
Location: Euless tx
Age: 21
Posts: 13
Gender: Male
Vehicle: 2002 ram
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:10
andrew93 is on a distinguished road
Default

i have the valve covers off now all of the push rods are were there suppose to be. also when i had the head off the block wouldnt i have seen problems if there was a dead cylinder when i had the heads off? the cylinder walls are clean and can see the honing lines
Reply With Quote
  #9  
Old 07-30-2013, 01:21 PM
mb power wagon's Avatar
mb power wagon mb power wagon is offline
Dodge Ram Forum Senior Member!
 
Join Date: Mar 2013
Location: manitoba
Posts: 360
Gender: Male
Vehicle: 2007 dodge power wagon
Trim Level: power wagon
Color: black
Engine: 2003-2008 345ci (5.7L) Hemi V8 345hp 375lb/ft
Rep Power: 0
Rep:68
mb power wagon will become famous soon enough
Default

not necessarily you won't see it if you have cracked rings unless you pull the piston out. for whatever reason your not getting compression on that cylinder. and the knocking can't be good. did you put a level across the deck of the block where the head goes on to see if it's still true? did you have the shop that did the heads double check to see if the heads were warped? the knock could also be a collapsed lifter.
__________________
Reply With Quote
  #10  
Old 07-30-2013, 05:56 PM
LEW LEW is offline
Dodge Ram Forum Junior Member
 
Join Date: Jan 2011
Location: Mechanicsville, Va
Posts: 40
Gender: Male
Vehicle: 2002 Ram 1500 Quadcab 4X4
Trim Level: SLT
Color: Black
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
Rep Power: 0
Rep:11
LEW is on a distinguished road
Default

If the "tapping" goes away after a few minutes, it's probably a lifter pumping up. If one of the cylinders is 0 psi compression, there must be a sizable leak on that cylinder. Seems like most of your engine problems were in the heads when you got the truck. Were the affected valve(s) reused, replaced or repaired (I'm not a mechanic, but repairing sounds risky depending on the extent of any damage)? Could be a valve(s) was damaged and not repaired correctly (maybe the stem is bent?) or the valve seat(s) was improperly repaired. The head itself could be damaged or the head gasket. Some BIG leak somewhere.

I guess it's possible enough of the compression rings could be damaged, but I'd focus on the head first.

If you're saying the other readings are 60-80 psi, that sounds LOW to me.

Last edited by LEW; 07-30-2013 at 05:58 PM. Reason: changed a word
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Advertisement






All times are GMT -4. The time now is 07:52 AM.


= Copyright RamForumZ.com a Gigathreads.com Network Site =Ad Management by RedTyger
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
vB.Sponsors


=Gigathreads Network=
CLUBS MOPAR NATION DSM GPMM MAMM JAM
DIESEL Diesel Forum      
CHEVY Chevy Camaro Forum Chevy Volt Forum    
CHRYSLER Chrysler 300C Forum      
DODGE Dodge Avenger Forum Dodge Caliber Forum Dodge Challenger Forum Dodge Charger Forum
  Dodge Circuit Forum Dodge Hornet Forum Dodge Magnum Forum Dodge Nitro Forum
  Dodge Ram Forum Dodge Dakota Forum Dodge Durango Forum Dodge Dart Forum
FORD Ford Raptor Forum Ford F150 Forum Ford F100 Forum  
JEEP Jeep Forum      
PONTIAC Pontiac G8 Forum      
SRT SRT Viper Forum SRT Cuda Forum