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  #1  
Old 03-01-2010, 01:53 PM
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Default High Idle,Cam Code

Hello I have a 2003 Ram 4.7L.

First off I am an auto technician so I am not completely lost, but 90% of what I work on is foreign cars. This is my personal truck, and my first go with the 4.7L engine.

I purchased the truck running, but with a blown headgasket. There was a questionable engine noise which may have been bearings, but not loud enough to give me a huge cause for concern. Money is tight so I decided to try to get away with just replacing the headgasket.

I completed the job and it starts right up, but idles at around 3300rpms. When you give it any gas it just bounces off 3500rpms as if its stuck in some kind of limp mode. The motor seems to sound OK though its difficult to hear with the high idle, there are no signs of any other damage.

The only code I get is a P0016, Cam/Crankshaft position correlation sensor. Both the cam and crank sensors seem fine, wiring is fine, and they were fine before. Throttle body, IAC, TPS all seem to be OK. I think the cam code is an indication it jumped time, however I have never heard of an increased idle from jumped time, and it seems to run OK. Maybe I have more than one problem but I would really like to figure out the idle.
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Old 03-01-2010, 04:15 PM
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Welcome to the forum. That one is above my head, but we've got a couple of Dodge techs here that might be able to help. Might want to go to the UserCP and fill out your profile. It will post some data on your truck so you don't have to put it on the posts everytime. Good luck.
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Old 03-01-2010, 07:19 PM
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Sounds like it's time to pull the cover and verify the timing marks. The 4.7 is an interference engine with very little margin for error. Even one tooth off on the cam can cause the intake valves to bend. You might consider pulling the valve cover off and checking the tone wheel for damage before removing the front cover but that's pretty unlikely unless you took the sprocket off the cam.
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Old 03-01-2010, 07:40 PM
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Quote:
Originally Posted by Remerson228 View Post
Sounds like it's time to pull the cover and verify the timing marks. The 4.7 is an interference engine with very little margin for error. Even one tooth off on the cam can cause the intake valves to bend. You might consider pulling the valve cover off and checking the tone wheel for damage before removing the front cover but that's pretty unlikely unless you took the sprocket off the cam.
I did have the sprocket off, I'll double check all that. I Specialize in the Dodge Stealth/3000GT, which is also an interference motor, and this motor just definitely doesn't act or seem like its out of time but I'm sure its possible. I verified timing several times and replaced the tensioners as well.
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Old 03-01-2010, 07:43 PM
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Is that the only code still stored in the PCM?

Last edited by RamTech; 03-01-2010 at 07:45 PM.
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Old 03-01-2010, 11:35 PM
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Quote:
Originally Posted by Remerson228 View Post
Is that the only code still stored in the PCM?
yes thats the only one
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Old 03-02-2010, 01:02 AM
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Symptoms of a P0016 will or may include:
  • Malfunction Indicator Lamp(MIL) illumination
  • The engine may run but with reduced performance
  • The engine may crank but not start
  • The engine may exhibit a rattle near the harmonic balancer indicating the tone ring is damaged
  • The engine may start and run, but poorly

Causes may include:
  • Timing chain stretched, or timing belt skipped a tooth due to wear
  • Misalignment of timing belt/chain
  • Tone ring on crankshaft slipped/broken
  • Tone ring on camshaft slipped/broken
  • Bad crank sensor
  • Bad sensor
  • Damaged wiring to crank/cam sensor
  • Timing belt/chain tensioner damaged
Possible Solutions

First, visually inspect the cam and crank sensors and their harnesses for damage. If you notice broken/frayed wires, repair and recheck.
  1. If you have access to a scope, check the cam and crank patterns. If a pattern is missing, suspect a bad sensor or a slipping tone ring. Remove the cam gear and the crankshaft harmonic balancer and inspect the tone rings for proper alignment and make sure they're not loose or damaged or that they haven't sheared the key that aligns them. If they are properly installed, replace the sensor.
  2. If the signal appears normal, then check the timing chain/belt for proper alignment. If it's misaligned, check for a damaged tensioner that may have allowed the chain/belt to slip a tooth or several teeth. Also check that the belt/chain isn't stretched. Repair and recheck.
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Old 03-06-2010, 12:52 AM
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Update, I went back in and verified all timing is correct, replaced a faulty coolant temp sensor, started it back up and its even worse. Just goes to 3500 and bounces off like a rev limiter. The only code this time around is P0121- TPS/Pedal position sensor. I replaced the TPS and no change. The only time I get it to come down is when I shift into drive. When I shift into Reverse it goes even higher, to like 5500rpms. I'm running out of ideas.
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Old 03-13-2010, 08:25 PM
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Oddly enough it seemed to have been the PCV valves. Both were completely shot and as soon as I replaced them I was able to get the idle completely down.
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