Dodge Challenger Forum banner

1 - 18 of 18 Posts

·
Registered
Joined
·
96 Posts
Discussion Starter #1
I have a 2013 Challenger R/T that I bought new. It currently has 30,000 miles. It is the 5.7 L engine. In the last 6 months, I have been smelling hot/burned coolant. I marked my overfill bottle and noticed that coolant is disappearing. However, there are no visible leaks. I do notice burned coolant at the front of the engine between the driver's head and intake manifold/block area. I have also been getting oxygen sensor codes being thrown every month or so--the check engine light typically goes away. The code indicates the o2 sensor is on the same side of the engine that I see burnt coolant. I'm worried that I have a blown head gasket that is leaking slowly out of that corner of the head. Any thoughts?
 

·
Premium Member
Joined
·
9,365 Posts
Pull the dip stick, how does the oil look? Feel under all the hoses for crud or take a small mirror and look as it make be a bad clamp somewhere. How about the thermostat housing?
 

·
Registered
2015 SRT392 A8 in white pearl coat
Joined
·
1,352 Posts
Do a compression check on the engine. Blown head gaskets and/or warped cylinder heads often produce low compression numbers on one or two cylinders.
 

·
Premium Member
Joined
·
1,808 Posts
Better yet, do a leak down test if the oil looks suspect. Did the engine get overheated? Post some pics of the residue from a few different angles
 

·
Premium Member
Joined
·
2,659 Posts
Sometimes it can look creamy white/yellow under the oil fill cap too (if the gasket is going)
 

·
Registered
Joined
·
96 Posts
Discussion Starter #6
Thanks everyone. The oil looks fine. I cleaned the residue to see if more appeared. Pics are bad, but you can clearly make out a brown discoloration between the head and intake in these pics. This area is just below the metal heater hose that runs to the heater core. The car was recalled for a water pump, which was replaced years ago, so I know that hose got moved. What do you think? Is this probably just an external leak? Also, the O2 sensor keeps dinging.
 

Attachments

·
Premium Member
Joined
·
1,808 Posts

·
Registered
Joined
·
2,275 Posts
You can send a sample of oil out to be analyzed. Among other things the oil is checked for the presence of anti-freeze compounds. If any are found then there's a coolant leak that is getting anti-freeze into the engine.

Plugs can be pulled and checked. A clean plug is a cylinder that is getting coolant.

Based on what you wrote doesn't read like a head gasket leak.

Reads like an external coolant leak. The O2 sensor behavior could arise if the coolant is getting on the sensor. Any signs of that?

What you can do if you want to test this yourself is top up the cold coolant tank with distilled water. Do not over fill the coolant tank but you want the level nearer the max than the min level.

Turn off the A/C. Drive the car around on city streets until the engine is fully warmed up. Back at home on your driveway raise RPMs to say 1K and hold until the coolant temperature gets as hot as it can before the fan kicks on. You can use an OBD2 tool to monitor coolant temperature if your car does not display accurate coolant temperature.

Just as the coolant temperature gets hot as it can get -- ideally you want it to get to 212F and higher is even better -- shut off the engine.

Wait.

The heat load of the engine will raise coolant temperature and with it pressure. Since everything is hot and under pressure the odds are you'll spot the leak source. Be careful getting your face too close to the hot engine in case a spray of hot coolant happens.

Use a flashlight and a mirror on on a stick/swivel to check the harder to see places. In these cases the car wants to be lifted up so a check for a coolant leak from underneath can be made but I believe based on what you wrote the leak is probably going to be visible from up top rather than from underneath the car.
 

·
Registered
Joined
·
96 Posts
Discussion Starter #9
Thank you all for your valuable suggestions. I checked all the hoses while the car was hot and under pressure. I am going to buy a new radiator cap for it. However, the overflow looks like it has never been wet. So it's probably not the cap. I'm stumped by the smell. I'm glad you think it doesn't sound like a head gasket Rockster. That is encouraging. It has never overheated or even gotten close to doing so. The oil looks clear and the water in the rad bottle is not oily. I'll just keep watching and hoping it's not a major issue.
 

·
Registered
Joined
·
3,501 Posts
Curious what the code number was you was getting?


Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
96 Posts
Discussion Starter #11
Curious what the code number was you was getting?


Sent from my iPhone using Tapatalk
The code that it keeps throwing is P0133. The CEL comes on for about 2 days, then goes off on its own. Is this an unrelated problem to my coolant smell?
 

·
Registered
Joined
·
2,275 Posts
Thank you all for your valuable suggestions. I checked all the hoses while the car was hot and under pressure. I am going to buy a new radiator cap for it. However, the overflow looks like it has never been wet. So it's probably not the cap. I'm stumped by the smell. I'm glad you think it doesn't sound like a head gasket Rockster. That is encouraging. It has never overheated or even gotten close to doing so. The oil looks clear and the water in the rad bottle is not oily. I'll just keep watching and hoping it's not a major issue.
A coolant leak is a major issue. If the engine's cooling system has a leak the concern is it can't hold pressure. It is pressure that prevents the coolant from boiling.

If the system is unable to hold pressure the hot coolant can flash to steam at the hottest places in the engine -- in the head around the exhaust valves -- and steam pockets can form. These pockets can then prevent coolant from making contact with these hot spots and they get hotter until there is a head gasket failure or worse.

These engines can get plenty hot relatively speaking even if they aren't working that hard. For instance in my Hellcat (but I've seen similar behavior from my R/T Scat Pack and other cars I've owned) today at lunch. Temperature in around 67F. Drove just a few miles on surface streets taking it easy never getting over 35mph and never getting out of 3rd gear and on the way back from the hamburger joint the coolant temperature reached 215F. I am going to be very interested in seeing how the engine coolant temperature and engine oil temperature "behave" come summer when under the same driving conditions I make that run with the ambient temperature in the triple digits.

Anyhow, I urge you to find the leak and fix it. The long term health of the engine depends upon it.
 

·
Premium Member
Joined
·
1,642 Posts
I have a 2013 Challenger R/T that I bought new. It currently has 30,000 miles. It is the 5.7 L engine. In the last 6 months, I have been smelling hot/burned coolant. I marked my overfill bottle and noticed that coolant is disappearing. However, there are no visible leaks. I do notice burned coolant at the front of the engine between the driver's head and intake manifold/block area. I have also been getting oxygen sensor codes being thrown every month or so--the check engine light typically goes away. The code indicates the o2 sensor is on the same side of the engine that I see burnt coolant. I'm worried that I have a blown head gasket that is leaking slowly out of that corner of the head. Any thoughts?
Good morning Mid-life crisis muscle,
We recognize that you are reaching out to other forum members at this time for feedback. However, if you do choose to visit a dealer. We would be more than happy to offer our assistance. Please feel free to send us a private message with additional details.
Julie
Dodge Social Care Specialist
 

·
Registered
Joined
·
2,275 Posts
The code that it keeps throwing is P0133. The CEL comes on for about 2 days, then goes off on its own. Is this an unrelated problem to my coolant smell?
Maybe unrelated.

Error Code P0113: Intake Air Temperature Circuit High Input. Error code P0113 indicates that the computer has received a high voltage signal from the intake air temperature sensor. This code will occur when the powertrain control module (PCM) receives a voltage of 5 volts or more from the IAT.

My advice is as I said in an earlier post is get the coolant leak addressed. Once you have this vital system back to 100% then you can turn your focus to the source of the P0113 error code. The P0113 error code can arise from a malfunctioning MAF

Oops! My bad! Sorry but I had a dyslexia memont and transposed some numbers. Again, sorry.
 

·
Registered
Joined
·
260 Posts
You mentioned the hose connected to the heater core. Check the floor inside the car for leaking coolant. You would definitely get the coolant smell if it's leaking inside the car.
 

·
Registered
Joined
·
103 Posts
OBD-II Code P0133 is defined as an Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1)

Code P0133 is triggered when the powertrain control module or PCM determines that the oxygen sensor voltage switch from below 400 millivolts to above 450 millivolts is taking too long. This value varies with each vehicle, however a conventional oxygen sensor needs to make this voltage switch in less than 100 milliseconds.
Source: https://repairpal.com/obd-ii-code-p0133
 

·
Registered
Joined
·
103 Posts
OBD-II Code P0133 is defined as an Oxygen Sensor Circuit Slow Response (Bank 1, Sensor 1)

Code P0133 is triggered when the powertrain control module or PCM determines that the oxygen sensor voltage switch from below 400 millivolts to above 450 millivolts is taking too long. This value varies with each vehicle, however a conventional oxygen sensor needs to make this voltage switch in less than 100 milliseconds.
Source: https://repairpal.com/obd-ii-code-p0133
 

·
Registered
Joined
·
96 Posts
Discussion Starter #18
Update on the coolant "leak." I replaced the radiator cap and it doesn't smell like coolant now. I will mark the overflow bottle and keep tabs on it for a while to see if I'm still losing coolant. I will report back the results. Thank you all for your help.
 
1 - 18 of 18 Posts
Top