Move the coil with another one (example #6)... if that cylinder triggers a code (#6) then you have a bad coil...

If #4 continues to throw a coil then you might have a harness issue, ECM, etc?

 

Move the coil with another one (example #6)... if that cylinder triggers a code (#6) then you have a bad coil...

If #4 continues to throw a coil then you might have a harness issue, ECM, etc?

Yeah Im gonna pull the plenum today and swap around the coils and see if it moves. If it doesnt Then could the #4 injector be bad and how do I check it because the intake plenum is in the way.

 

Pull the intake? Oops sorry I am very familiar with 5.7 Hemi V8, just realized your V6.

Doesn't matter the concept is the same...

Usually, Injectors are check with a "noid light"... I am sure there are extension harness available... But you might be able to view injector pulse width and duty cycle on a quality scanning tool (i.e., Snap-on, etc.)?

You could also pull a spark plug out and see how that cylinder is firing...

 

Any of the above options is not the issue. I cant pull the intake plenum and run any tests while its off? Can I? I cant even reach the plugs for the injections with the intake plenum in the way.

 

Intake has to be on to run the engine buddy.

 

Hence why I hate how Mopar design this stupid plenum. What a bad design.

 

In fairness that engine is designed to go 100K between spark plug maintenance...so you should be pulling the intake very frequently. Must have been a design limitation to the performance specs required.
However, I'll take the simple Hemi any day.

 

Yeah. The 3.6L intake Plenum is a weird design. The passenger side is easily accessible. Drivers side is not. So the spark plugs, coils and injectors are covered. Now its not too difficult but some of the bolts on the intake plenum are really difficult to reach without an extension and universal and you cant see anything youre working on.

 

Number 4 is right side middle cylinder?

 

JR:
If you pull the intake, run a compression check while it's out of the way. A silver lining in the cloud, lol.

Don

 

I dont have a compression tester. I can see if there is gas in my oil! I guess I could rent one from Autozone. What PSI should I be getting.

 

You basically just want them all to be within 10 lbs of each other as they won't all read low. Just make sure both valves are closed on each cylinder when you measure it.

 

Yeah its been about 20 years since I built a motor and had to compression test one. I think Autozone has one I can rent for about $50.

 

Compression test would reveal what condition your engine. 125-175 is the normal range, but what's important that each cylinder not have a variance of more than 10% from the others.

 

Tool rental is usually free.

 

Yeah you get the money back when you bring the tool back.

 

If you trust them, Harbor Freight. Harbor Freight Tools – Quality Tools at Discount Prices Since 1977

 

If you trust them, Harbor Freight. Harbor Freight Tools – Quality Tools at Discount Prices Since 1977

Not really but ive used some of their tools for a long time with no issues. But as I was removing the fuel rail to see if I have a bad injector my "magnetic" torx bit let a bolt and it fell down into the head. Now I gotta take the lower intake plenum off and get new gaskets. Joy. Once thats done im gonna swap injectors 2 and 4 see if the miss moves to the #2 if it does then I have a bad injector If thats not it then im gonna check the wiring with a multimeter to see if im getting proper voltage and if that passes then ill check the compression of #4.

 

If it’s a magnetic bit. Put a steel nut on a string and drop it down the same intake runner. Try fishing it out that way. Hope the bit doesn’t get past the valve and into the cylinder.

 

I got it out and found the source of the misfire. #4 cylinders spark plug had broken ceramic insulator that wasnt allowing a spark. I have never saw a spark plug insulator break. the ceramic didnt break off into the cylinder thank god.

 

That sure stinks:
Any way at all you can get something in there to retrieve it to avoid the LI removal?

Don

 

Great news buddy.

 

And lastly. whats the best way to clean the surface of the heads for the new lower intake plenum. They are rather grimy. I have already put paper towel into the heads to stop any debris from getting into the valve train.

 

Shop towels would be better than paper towels as they are more flexible and softer to fit nooks and crannies.

 

Like as in the cloth ones or the blue ones? LOL. I apparently used all my blue shop towels on my wifes VW. LOL. And I still need to clean the top of the head. I guess brake clean?

 

FWIW 2012's had a TSB for one or more misfires.

 

How do I go about determining if this repair was done already and now even with 171k miles on it will they still do the warranty repair on it?

 

Contact your local Dodge dealer. Have VIN ready. Also They might ask to see the vehicle.

 

That was a Technical Service Bulletin (TSB) they are only covered under the factory warranty period. A recall is a totally different animal. They may be able to tell you if it was done, but will not do it for free if it has not been done.

 

Contact your local dealer.

FYI depends on the recall. My 05’ Mustang GT had both its air bags replaced last year and I am the second owner.

 

Ok, I will try to be a little more clear as my last hint did not work.
JC Hemi- THIS IS NOT A RECALL. Please stop guiding him in the wrong direction. A recall is SAFETY related and the manufacturers HAVE to fix the vehicle free of charge. No matter the age/mileage/year/owner, This was a TSB, which says “yea we messed something up but it is not safety, so if the customer complains about this AND the vehicle is still under factory warranty we will fix it.” There were probably 150-200 TSB’s for this Durango. The dealer is not going to honor any TSB with 175K miles on the clock. If you don’t want to take my word for it, take the time to read the TSB that was attached.

 

First simmer down buddy. We are all here to help.

I am NOT leading him in the wrong direction. If the TSB was ever done at a dealership then it in their system.

For the record, you’re the one that mentioned recall.

 

@ JR:
As JC Hemi says, if the repair was done on your D, it should be in the dealer's data base. I say should, because we have heard of instances where this was not done, to the detriment of the customer. As I read it, this particular program Is considered a warranty extension, hence the mentioned X56 Warranty Extension ID.
This means it will be done at no cost to the customer within the guidelines of the extension. IIRC, this one was 10 yrs, or 150k miles. Since JR's D is at 171k, it would not be eligible.

Don

 

It does not depend on the recall, because it is not a recall.

 

Yeah I was wondering about that. I just need to make this SUV last another year or so. So I dont think the TSB will cover me as the vehicle is well beyond its warranty. So. Think ill just forgo contacting them. However if it was already "fixed" and fails again MOPAR/FIAT/Dodge should cover it.

 

So as I have the entire intake system apart I figured it was time to put some new parts in the engine. New upper and lower intake gaskets, new throttle body gasket and brand new injectors. And debating on doing all new plugs again even though they have less than 40k miles on them.

 

How about swapping out the plastic oil filter housing with an aluminum one? Most of those kits come with all the gaskets included.

 

Dorman 1000 percent worth the extra couple hundred.

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