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Misfire Cylinder 4 code

 
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  #1 (permalink)  
Old 13 Aug 2016, 11:22 am
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Question Misfire Cylinder 4 code

Good morning everyone,

I replaced the spark plugs a few weeks ago. This am there was a code for a misfire on cylinder 4. When I changed the plugs and wires the ignition module on plug 4 was a little crusty so I cleaned it off with some steel wool.

The car gets hotter than normal. Any ideas? Should I buy a new ignition module?

any help would be appreciated.

Thank you
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2006 PT touring edition, 5 spd manual, 140K, MSD 8.5 mm wires, Champion plugs
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Old 13 Aug 2016, 11:34 am
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Default Re: Misfire Cylinder 4 code

Quote:
Originally Posted by discovering06 View Post
Good morning everyone,

I replaced the spark plugs a few weeks ago. This am there was a code for a misfire on cylinder 4. When I changed the plugs and wires the ignition module on plug 4 was a little crusty so I cleaned it off with some steel wool.

The car gets hotter than normal. Any ideas? Should I buy a new ignition module?

any help would be appreciated.

Thank you
Its looks like you might have two separate problems or one is related to the other.

What made you replace the spark plugs a few weeks ago?

Did the old spark plugs look like they were all firing properly?

Have you replaced the spark plug wires? If so when?

How did you tighten the spark plugs? Some members have found the spark plugs loose.

Did you physically check each of the new spark plugs before installing them? Some members have found cracks in the spark plugs triggering a code.

Did you check the vacuum hose going from the PCV to under the intake manifold? Sometimes they get hard and after replacing spark plugs they crack.

Is it a turbo or base model?

Is the PT Cruiser getting hot at highway and low speeds or just low speeds? Are you loosing coolant?

How many miles on the PT Cruiser?
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Last edited by ptcruisersteve; 13 Aug 2016 at 11:53 am.
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Old 13 Aug 2016, 12:27 pm
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Default Re: Misfire Cylinder 4 code

After further inspection the coolant reservoir is full. After opening the cap near the top hose no coolant or pressure was in the tube. It's not losing coolant under pressure.
Should I put Hoat in the where the cap is? The water pump and thermostat was changed at 70k. The car has 119k now.

The misfire I'll just replace the ignition coil there is crack after carefully looking at it .
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Old 13 Aug 2016, 12:31 pm
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Default Re: Misfire Cylinder 4 code

The wires and plugs were replaced 3 weeks ago. Routine maintenance I checked each plug and galled them correctly 0.40.
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Old 13 Aug 2016, 12:42 pm
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Location: Thousand Oaks, CA
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Default Re: Misfire Cylinder 4 code

Quote:
Originally Posted by discovering06 View Post
After further inspection the coolant reservoir is full. After opening the cap near the top hose no coolant or pressure was in the tube. It's not losing coolant under pressure.
Should I put Hoat in the where the cap is? The water pump and thermostat was changed at 70k. The car has 119k now.

The misfire I'll just replace the ignition coil there is crack after carefully looking at it .
Have you considered the hose going from the cap to the reservoir might have a leak?
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Old 13 Aug 2016, 12:44 pm
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Default Re: Misfire Cylinder 4 code

Over the years, I've watched posts about single-cylinder misfires, and while I do not have statistics, I have made the following observations:
-most common is cylinder 4 - don't know why.
- most common cause is plug/ignition wire
- next most common cause is leaking intake gasket
- next most common is bad injector
- lastly, valve problems.
Coils rarely go bad, and if it did, probably would screw up more than one cylinder, but could be....
Let us know.
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'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
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Old 13 Aug 2016, 12:48 pm
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Default Re: Misfire Cylinder 4 code

The reservoir is full. I'm assuming if it had a leak it would be empty.
I had the upper and lower hoses replaced at 70k.

Can I run the engine with the cap open and add hoat?
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Old 13 Aug 2016, 01:00 pm
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Default Re: Misfire Cylinder 4 code

Quote:
Originally Posted by discovering06 View Post
The reservoir is full. I'm assuming if it had a leak it would be empty.
I had the upper and lower hoses replaced at 70k.

Can I run the engine with the cap open and add hoat?
If the engine is cold, yes.
__________________
"Anti-intellectualism has been a constant thread winding its way through our political and cultural life,
nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge."
Isaac Asimov"

'05 Limited Turbo Lite, (Silver, of course)4-wheel ABS, Sunroof, Spoiler. Mods: E&G Classic grill, K&N FIPK, BTG duals, rear lowered 1.5", LED washer lights, $20 catch can, Aoogah horn, Weatherflectors, Sunroof Deflector, Fuzzy Dice, rear logo flames, rear pinstripe graphic, Gen3 Taillights, rear sway bar, hood struts, Strut bar.
Traded in '02 Silver Touring Edition w/87,000 miles
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Old 13 Aug 2016, 01:07 pm
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Default Re: Misfire Cylinder 4 code

Quote:
Originally Posted by quicksilverdon View Post
If the engine is cold, yes.
When you start the engine and it starts to warm up the HOAT coolant will start to expand overflowing where the cap is. This is why they have a air bleeder valve to remove any air in the coolant system after burping the coolant system.
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Last edited by ptcruisersteve; 13 Aug 2016 at 01:13 pm.
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Old 13 Aug 2016, 01:11 pm
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Default Re: Misfire Cylinder 4 code

Quote:
Originally Posted by discovering06 View Post
The reservoir is full. I'm assuming if it had a leak it would be empty.
I had the upper and lower hoses replaced at 70k.

Can I run the engine with the cap open and add hoat?
I am talking about the little hose running from the cap to the overflow tank. If that little hose is leaking you will get air in the coolant system and overheat the engine.
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