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SilverSandRam
 
  NEED HELP Misfire only when cold. - Posted: 11-09-2010, 06:44 PM
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Post #1

Here is my latest problem with my dream truck that has turned into a nightmare. For whatever reason when the block is cold and it is started it misses like crazy, the way the whole truck shakes when the engine is under a load makes me think it’s going to blow sky high. The engine light flashes for about 5 seconds and then goes off. After the engine warms up a little the problem completely goes away and it runs like a bat out of hell. I just changed the plugs to Champion stockers and it still did it this morning. I took it to Pep Boys to have the error code read and it came up as the # 6 cylinder misfiring. Unfortunately they were not able to tell me what was causing it unless I paid to have a diagnostic test done. I am going to switch the coil pack out on that cylinder tomorrow and see if that fixes it. If not ”God forbid” what is my next cheapest step?

2006 Ram 1500 5.7 Hemi 4x4
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fannitti
 
 Posted: 11-09-2010, 06:57 PM
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Post #2

swap coils with a diff cylinder and have the codes cleared. start it the next more and when it flashes and dose it things check the coad and see if the misfire moved with the coil, if it did then u found ur prob.
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SilverSandRam
 
 Posted: 11-09-2010, 07:01 PM
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I'll try it! To me its just weird that it only does it when its cold...
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JFM-jr
 
 Posted: 11-09-2010, 07:22 PM
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Quote:
Originally Posted by fannitti View Post
swap coils with a diff cylinder and have the codes cleared. start it the next more and when it flashes and dose it things check the coad and see if the misfire moved with the coil, if it did then u found ur prob.
Thats exactly what I would suggest, it's ignition related so a coil,wire,or plug. It's great you have a cylinder number to work with makes your job ALOT easier, I suspect the coil is your problem. keep us posted
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BossMaverick
 
 Posted: 11-10-2010, 01:01 AM
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Post #5

This is exactly what my truck did when my EGR valve went out. If swapping coil packs do nothing for you, it might just be your EGR valve. The EGR valve is common to go out on these trucks. It's reasonably priced and easy to install.
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ceri
 
 Posted: 11-10-2010, 01:09 AM
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Post #6

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Originally Posted by BossMaverick View Post
This is exactly what my truck did when my EGR valve went out. If swapping coil packs do nothing for you, it might just be your EGR valve. The EGR valve is common to go out on these trucks. It's reasonably priced and easy to install.
You might be able to clean your EGR valve with carb cleaner vs. buying a new one, but a new one is only like $35 at most of the auto retailer brick and morters anyway. Not saying that's the problem, just throwing that in if it turns out to be.
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Doug D
 
 Posted: 11-10-2010, 05:43 AM
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Originally Posted by ceri View Post
You might be able to clean your EGR valve with carb cleaner vs. buying a new one, but a new one is only like $35 at most of the auto retailer brick and morters anyway. Not saying that's the problem, just throwing that in if it turns out to be.
$35? Dang, the cheapest I could find an EGR for my '06 Hemi was $77 (local dealer), other dealers charge $95 or so and it was a dealer only item. None of the local auto stores (Advance, AZ, NAPA) carried them. Not too hard to replace - at least it's fairly easy to get to.
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DeMoN-HeMi
 
 Posted: 11-10-2010, 06:28 AM
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Post #8

thats what mine did when i had a bad coil
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ceri
 
 Posted: 11-10-2010, 08:56 AM
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Post #9

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Originally Posted by Doug D View Post
$35? Dang, the cheapest I could find an EGR for my '06 Hemi was $77 (local dealer), other dealers charge $95 or so and it was a dealer only item. None of the local auto stores (Advance, AZ, NAPA) carried them. Not too hard to replace - at least it's fairly easy to get to.
Ouch. I paid ~$42 at an autozone when I did mine, but I've read up on here where people have been getting them for $35 more recently. Could be the '06s aren't carried at the local retailers.
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SilverSandRam
 
 Posted: 11-10-2010, 06:34 PM
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Post #10

Thanks guys for the impute I am going to change the coil out first thing in the morning before I start it to see if that fixes the problem.
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SilverSandRam
 
 Posted: 11-12-2010, 08:30 AM
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Post #11

No luck with the new coil, just took it to the dealership.
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Limedust
 
 Posted: 11-12-2010, 08:44 AM
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Post #12

I'm willing to bet you have a break in the wiring somewhere on that primary cylinder spark circuit. When the truck is cold, the wiring "shrinks up" and you can get an open circuit (resulting in a misfire). When the engine block heats up, the copper expands and closes up whatever gap you had in the wiring, and the truck runs normally.

Note that the wiring can include the coils, the wires that come from the PCM to the coils, or the heavy gauge plug wires.

Check that all of the connectors are tight, and all of the coils are firmly seated.
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SilverSandRam
 
 Posted: 11-13-2010, 06:58 PM
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Post #13

Looks like it has a bad injector, GOOD TIMES!
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ceri
 
 Posted: 11-14-2010, 02:58 AM
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Post #14

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Originally Posted by SilverSandRam View Post
Looks like it has a bad injector, GOOD TIMES!
That's actually not as bad as you might think. Replacing an injector is much easier than something piston or block related. You can swap in a new injector fairly easily. Not saying a shops not going to bend you over for it, but it could definitely be worse. If they haven't already done the work, I'm almost certain you could swap it yourself on a Saturday with a little research for under $100. Rock auto lists an '06 injector for $55 new or $43 reman.
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SilverSandRam
 
 Posted: 11-16-2010, 08:28 PM
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Post #15

Thanks for the info, its under warrenty so its not going to be too bad.
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