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Discussion Starter · #1 ·
I know this has been posted about before but I've looked through all other forums and tried almost all suggestions and still throwing a code. I have a 2002 ram 1500 with the 4.7 in it. I was driving home doing nothing out of the ordinary and check engine light came on. Hooked up the code reader found p0305 cylinder 5 misfire. So I did as the forums advised, changed the plug and properly gapped it properly, changed the coil and when that didn't work I swapped the injector around, still have the problem. Checked spark and it's getting spark. checked fuel, getting fuel. What is possibly going wrong with this engine that it keeps misfiring?
 

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check compression, could have a sticky valve hanging opening a little bit causing to loose compression. are you at the right cylinder too, not trying to seem like an ass cause it sounds like you got pretty much all the base covered. are you using champion plugs? take a 194 bulb, straighten the little tabs on the bottom and disconnect the injected and plug the 194 into the harness of the injector and check injector pulse, cheap and easy way to check injector pulse.
 

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I know this has been posted about before but I've looked through all other forums and tried almost all suggestions and still throwing a code. I have a 2002 ram 1500 with the 4.7 in it. I was driving home doing nothing out of the ordinary and check engine light came on. Hooked up the code reader found p0305 cylinder 5 misfire. So I did as the forums advised, changed the plug and properly gapped it properly, changed the coil and when that didn't work I swapped the injector around, still have the problem. Checked spark and it's getting spark. checked fuel, getting fuel. What is possibly going wrong with this engine that it keeps misfiring?
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RVFamily
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Discussion Starter · #1 · 12 d ago

2013 Traverse LTZ, 93000 miles - Got P0305 code and took to dealer who said burnt #5 cylinder. Wants $7800 for new engine or $5300 to replace head. Does this sound reasonable? Everything I have found says that it should be around $3500 to replace the head. Thanks for the help.


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electbc
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#2 · 12 d ago

How did he determine it is a burnt cylinder? Get a second and possibly third opinion.


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RVFamily
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Discussion Starter · #3 · 12 d ago

electbc said:
How did he determine it is a burnt cylinder? Get a second and possibly third opinion.
I should have said burnt valve, not cylinder. They did a bleed down compression check and injector flow rate test. The bleed down compression test was half the value of the other cylinders. The injector flow rate test was okay. Also I put scope down the air intake and the #5 valve was very different from all the others.

Still wondering if $5300 to replace the head is legitimate price? Anybody know??


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greentraverse
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#4 · 12 d ago

Seems awfully high to me when timing chain replacements are running $3K.

2011 2LT FWD replaced by 2017 2LT AWD

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electbc
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#5 · 12 d ago

Do you have a picture of the valve?


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RVFamily
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Discussion Starter · #6 · 11 d ago (Edited)

electbc said:
Do you have a picture of the valve?
No, i just used my scope and unfortunately it doesn't record. When I looked at #5, compared to the others it was smoother/cleaner with no sign of build up on it, very smooth. The others showed signs of some "build up" - I don't know how to describe it better. The dealer said the head replacement includes new timing chains and related parts. The estimate is for 23 hours of labor @ approx $100/hr


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electbc
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#7 · 11 d ago (Edited)

are you driving it? What kind of gas do you use discount or Top Tier? If you are driving it with this issue anyway, then I would recommend trying a couple of tankfuls of Techtron concentrate before you sink the $$$ into it. And if you do get a flashing CEL, follow the Owners Manual Recommendations on this condition.

www.enclaveforum.net

Misfire on all rear cylinders. 1-3-5.
2009 Buick Enclave CXL AWD with 98k. I have a noticeable misfire with codes reading misfire on cylinders 1,3 and 5. All coils have been replaced and all plugs are new. I also get a code reading catalyst system below effective threshold. I replaced the O2 sensor on the back side, pre catalytic...
www.enclaveforum.net
www.enclaveforum.net
Also, what kind of scanner do you have? Something that can read real time vitals such as Cat temps can help to see if you are burning efficiently. I use Bluedriver, there are others as well.


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RVFamily
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Discussion Starter · #8 · 11 d ago

electbc said:
are you driving it? What kind of gas do you use discount or Top Tier? If you are driving it with this issue anyway, then I would recommend trying a couple of tankfuls of Techtron concentrate before you sink the $$$ into it. And if you do get a flashing CEL, follow the Owners Manual Recommendations on this condition.

www.enclaveforum.net

Misfire on all rear cylinders. 1-3-5.
2009 Buick Enclave CXL AWD with 98k. I have a noticeable misfire with codes reading misfire on cylinders 1,3 and 5. All coils have been replaced and all plugs are new. I also get a code reading catalyst system below effective threshold. I replaced the O2 sensor on the back side, pre catalytic...
www.enclaveforum.net
www.enclaveforum.net
Also, what kind of scanner do you have? Something that can read real time vitals such as Cat temps can help to see if you are burning efficiently. I use Bluedriver, there are others as well.
Click to expand...
The car is currently at at the dealer. What I'm really trying to determine how much $$$ is "normal" for the head replacement. There are no other dealers within a 60 mile radius of where I'm at to take it to for a second opinion.

To answer your questions.....

I buy fuel from brand name stations that have higher volume turnover. My scanner is a standard handheld - nothing fancy.

Also I replaced the plugs, coils, mass air flow sensor, cleaned throttle body assembly, replaced intake manifold gaskets upper and lower and O2 sensors before taking to dealer.

The CEL is flashing and the following is what the manual said. Turning off and restarting engine still produced a flashing CEL.

Light Flashing: A misfire condition has been detected. A misfire increases vehicle emissions and could damage the emission control system on the vehicle. Diagnosis and service might be required.
To prevent more serious damage to the vehicle:
The following may correct an emission control system malfunction:
If one or more of these conditions occurs, change the fuel brand used. It may require at least one full tank of the proper fuel to turn the light off.
Reduce vehicle speed.
Avoid hard accelerations.
Avoid steep uphill grades.
If towing a trailer, reduce the amount of cargo being hauled as soon as it is possible.
If the light continues to flash, find a safe place to stop and park the
vehicle. Turn the vehicle off, wait at least 10 seconds, and restart the engine. If the light is still flashing,
follow the previous steps and see your dealer for service as soon as possible.




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greentraverse
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#9 · 11 d ago

You might try disconnecting the battery for a few minutes. Kind of like re-booting your computer when nothing else seems to work.

2011 2LT FWD replaced by 2017 2LT AWD

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Discussion Starter · #10 · 11 d ago

greentraverse said:
You might try disconnecting the battery for a few minutes. Kind of like re-booting your computer when nothing else seems to work.
Have done that already too with no luck.

Unfortunately at this point I'm out of options and I'm just going to have to trust that the dealer service has diagnosed the problem correctly and isn't overcharging me since there's no other repair service available.

Thank you all for your ideas and help.


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M.Puono
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#11 · a moment ago

I've had this problem with my 2010 dodge 1500 for over the past year...P0305 & P0300 codes...
I've replaced spark plugs, distributor, cables, seals, lifters... and so on.....even had my electrical and fuel systems looked at. I've spend over $5000.00 on fixes that haven't solved anything as the codes show up within a week or so after the work has been done. Used multiple dealerships as I've gotten frustrated as each tries different thing that just cost more cash.
I was speaking to a service tech at a new dealership who mentioned Chrysler has know about this problem for over 10years and finally released a resolution... claimed it is a software problem that detects a small gap in the firing timing and labels its a fault when no issue is there.... he claimed once a compression test has been done along with spark plug and distributor has been checked that they have been instructed to flash the ECM with this new update.

This applies for codes from p0300 to p0308.

So I just had my ECU updated today and noticed no fault codes, I even own a code reader now and checked myself... no codes, no faults detected during tests, the vehicle idled better and felt like it had more power while driving.

Another issue I've been dealing with has been my dodge clunking from the rear end when leaving a stand still (light) or when shifting into drive and first moving.... rear control arms replaced and solved nothing, axle checked, fluids changed... no resolution.... speaking to the same tech as he mentioned a shift timing update avail for the PCM... DONE today as well, no clunk noticed when shifting or leaving park or leaving a light... keeping my fingers crossed.... lol
 
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