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I have a 2007 dodge caliber throwing a p0304 misfire code

Customer Question
the plugs are brand new...
i have a 2007 dodge caliber throwing a p0304 misfire code the plugs are brand new the coil is firing the injector has power i didnt check for pulse but did a ohms test and test good compression is good what else would cause one cylinder to misfire only
JA: Have you seen the misfire code before? Has the car been stalling?
Customer: if you rev it up and let drop back down it does stall
JA: Are you fixing your Caliber yourself? What have you tried so far?
Customer: yes so far just what i told you about in the first message is there any sensors that will cut the pulse off to just one injector for some strange reason once started you can also smell the catalytic converter after a few minutes of running
JA: Anything else you want the mechanic to know before I connect you?
Customer: no
Submitted: 1 year ago.Category: Dodge
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Answered in 4 minutes by:
10/18/2016
Dodge Mechanic: Cary York,
 replied 1 year ago
Cary York
Category: Dodge
Satisfied Customers: 217
Experience: Auto Tech at Certified Auto Repair
Verified

Hi, I’m Cary and I’ll be helping you today.
Please understand that I can't smell, hear, or touch the vehicle, so patience is appreciated. Before leaving the site make sure and leave me a rating. You can still reply to me as many times as needed, even after the rating..

Can you feel the engine misfiring.

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Customer reply replied 1 year ago
you can feel it shake
Dodge Mechanic: Cary York,
 replied 1 year ago

If you can smell the cat conv I would assume the injector is firing, dumping fuel into the cyl and in the exhaust.

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Dodge Mechanic: Cary York,
 replied 1 year ago

The sure way of course would be to check pulse.

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Customer reply replied 1 year ago
if the coil is firing and you have fuel and the compression is good then what can cause a misfire
Dodge Mechanic: Cary York,
 replied 1 year ago

The coil. You said it was firing. Did you remove the coil and leave it plugged in and check for spark that way?

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Customer reply replied 1 year ago
i pulled it and put a plug in the end of it and started the car and watched the spark while running
Dodge Mechanic: Cary York,
 replied 1 year ago

What size engine?

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Customer reply replied 1 year ago
2.0 you can swap the plug and the coil around and the misfire only stays at cylinder 4
Dodge Mechanic: Cary York,
 replied 1 year ago

A broken valve spring can cause a misfire and still have good compression spinning over at starter speed. I have seen this several times. I would remove the valve cover and inspect. It only pays 0.7 hours to R&R so it is not that hard. And the gasket is reusable.

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Dodge Mechanic: Cary York,
 replied 1 year ago

Remember if you rate me we can still continue the discussion.

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Customer reply replied 1 year ago
i will check the valve spring should it be easy to tell once the cover is off or will it be hard to tell
Dodge Mechanic: Cary York,
 replied 1 year ago

Yes it should. Just follow the coils of the spring from one end to the other. You may need a small mirror in some areas.

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Dodge Mechanic: Cary York,
 replied 1 year ago

Just remember. There are 4 valves/springs per cyl. Look at all 4 on the cyl.

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Customer reply replied 1 year ago
well i pulled the valve cover gasket and had my son bump it over and all 4 valves seem to be coming back up the same height to make 100% sure i will have to remove the cams and the valve spring covers to see them fully but just from how they perform they seem to be okay
Dodge Mechanic: Cary York,
 replied 1 year ago

I will open this up to another expert to see if the can help. I have to go. Thank you.

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Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 1 year ago
-Brad-
-Brad-, Dodge Dealership Tech
Category: Dodge
Satisfied Customers: 8,116
Experience: 16 Yrs Chrysler/Dodge Technician. ASE Master Certified(L-1)
Verified

Good evening and welcome to JustAnswer!!

My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 19 years and I will do my best to help.

I will need for you to check the compression of cylinder #4 and tell me what you get..

Talk soon,

Brad

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Customer reply replied 1 year ago
okay did a bunch of testing and checking the only thing i didnt do before is check the injector pulse so i put valve cover back on and all the coils back in unplug the injector check for pulse so i plug the injector back in it was running fine then after a few minutes the check engine light starts flashing and it running rough again so i check the pulse at that moment and no pulse is there a cam sensor or something that could be faulty shutting down the fuel pulse to # 4 cylinder
Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 1 year ago

If you are 100% sure that your loosing injector pulse for cylinder #4 then swap #4 with #3 injectors and then tell e if the misfire moves to #3 cylinder(P0303)

Talk soon,

Brad

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Customer reply replied 1 year ago
okay did it . it ran fine for a few minutes then came up cylinder #4 misfire again there is a tapping noise sounds like a loud injector could it possibly be a broken valve spring if so is it possible to take all the cam bolts and caps off without disturbing the timing and remove the spring caps to see or do you have another possible cause
Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 1 year ago

Since the misfire is staying on #4 it is time to check the compression..

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Customer reply replied 1 year ago
okay checked the compression it was 180 i let it sit for a hour and it didnt leak down at all
Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 1 year ago

Good morning...

If you got 180 in cylinder #4 then I would need for you to test the other 3 because 180 is on the high side and you may have a camshaft issue.. This world engine doesn't have rocker arms but rather buckets. The camshaft will push down on the bucket and the bucket is on top of the valves.. Spin the engine over with the valvecover off(Disable the ASD relay) and see if the camshaft is pushing down the bucket as the rest. Here is the valve lash:

Valve Lash

Intake0.17 - 0.23 mm0.006 - 0.009 in.

Exhaust0.27 - 0.33 mm0.010 - 0.012 in.

Let me know your findings,

Brad

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Customer reply replied 1 year ago
okay i will have to check the valve lash but the buckets all seem to be going up and down the same amount i watched them the other day when trying to see if there was a broken valve spring but according to alldata the compression should be from 170 to 225 on this engine
Dodge Mechanic: -Brad-, Dodge Dealership Tech replied 1 year ago

Yes you are correct the compression should be:

Compression Pressure1172 - 1551 kPa170 - 225 psi

The tapping your hearing is worrying me, can you tell if it's coming from in the head or outside the engine? If the PCM detects a misfire it will kill the injector to that cylinder...

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Customer reply replied 1 year ago
it is really hard to tell it sounds like outside but if you put your head near the 3rd and 4th cylinder it sounds like it could be coming from the inside near the intake valves
Customer reply replied 1 year ago
okay checked all of them and the biggest i could fit for intake on all cylinders was .008 and intake .014
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-Brad-
-Brad-
-Brad-, Dodge Dealership Tech
Category: Dodge
Satisfied Customers: 8,116
8,116 Satisfied Customers
Experience: 16 Yrs Chrysler/Dodge Technician. ASE Master Certified(L-1)

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