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My knock sensor comes on and thr car acts like it is overheating. Smells like antifreeze.

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  • Cars & Trucks Master
  • 14,585 Answers

It is overheating. Find the coolant leak and repair it before serious damage happens. The knock sensor sets a codes because of the pinging of overheating.

Posted on Dec 07, 2014

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Posted on Jan 02, 2017

  • 844 Answers

SOURCE: my car is overheating and it smells like

sounds like you have a coolant leak inside the engine compartment and its steaming off the engine heat. You need to check heat sensors also as those fans need to run to keep motor cool. Beware , those fans can turn on at any time so keep hands and fingers clear of them when checking or workng near them.

Posted on Feb 03, 2011

emissionwiz
  • 74945 Answers

SOURCE: I have been smelling antifreeze coming through the

this is caused by the heater core inside the dash leaking, it is like a small radiator.

Posted on May 20, 2010

  • 691 Answers

SOURCE: overheated due to a heater

I hate to have to tell you this....

Because of the overheating you have a blown gasket. Either the intake gasket, or one if not both head gaskets. Pull the plugs and see how many are wet or smell like anti-freeze.

Depending on the type of heads, aluminum or cast iron, they may be warped as well.

Before you grab your crying towel....it is also possible that anti-freeze from the leaking hose found a way to seep into the exhaust pipes and it will take awhile to clear out.

Hope this helps.

Posted on Aug 07, 2011

caroldon
  • 17129 Answers

SOURCE: acts like its overheating, the antifreeze looks

Overheating can stall the fuel supply reduce the fuel flow and also can be related to failure of ignition, if igntion system fails.
The overheating of the car can be due to many reasons and you need to check on each one to confirm the working of the system.
1. In the first place the working of the engine must be assessed. it must be smooth with a good indication that the tuning timing and the power seems good. This will confirm that the settings of the engine is good and so there is less scope that the engine seems to heat up on its own.
2. Secondly the radiator pressure cap must be tight and good, the radiator MUST not loose coolant after a run or in a few days time- since this must be a sealed system and there is no scope of water overflow or loss unless there is a leak- sometimes the leak is too microscopic as under high pressure only steam might escape and so reduce the coolant. So check for leaks while the engine is hot , specially the radiator, the hose or the fittings.
3. The working of the water pump must be good to ensure a good flow and circulation, so check for leak in the water pump, check for presence of water in the exhaust or leaking on the engine gaskets.
4.Make sure that the coolant is good and clean if not drain and refill , if there is presence of rust please have a good flushing of the radiator or else the chances are that the radiator ports can be blocked and reduce the efficiency of the cooling .
5. Finally the cooling fan, the radiator fan must be working, check the thermostat/thermistor to work accordingly with good flow, have a good water jet wash on the radiator for a clean radiator cooling fin exposure

Posted on Oct 29, 2011

perkins48
  • 14185 Answers

SOURCE: its overheating n leaking antifreeze. we notice its leaking by the firewall n inside the car it smells like antifreeze. i need a diagram of the coolant system. the engine size is 2.3L. we replace

You have 2 hoses going in the firewall,to the heater core,the core may be bad and leaking.Here's a link to the heater core removal.

Posted on Nov 30, 2012

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Not Overheating, Smells like really hot antifreeze after I drive, a/c ok heater heats but when stopped air gets cold...stummped..thermostat?, Leak?


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My 2001 town and country limited is overheating without indication from the gages and has a burnt smell coming through the inside vents of the van.


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My car is overheating and it smells like antifreeze in the car and the fans not coming on?


sounds like you have a coolant leak inside the engine compartment and its steaming off the engine heat. You need to check heat sensors also as those fans need to run to keep motor cool. Beware , those fans can turn on at any time so keep hands and fingers clear of them when checking or workng near them.

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Replaced cracked radiator in 2000 Chrysler LHS but car still overheating. What could be the problem?


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Were are the sensors for the engine fans in a nissaan sentra gxe


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1 Answer

Have a 1999 lexus es300. Getting indications that knock sensors need to be replaced. Car has 144k miles. What do the knock sensors do and how easy / tough to replace?


If you have some common tools the knock sensors are no big deal.  If you take a lexus they will make is sound like you need to completely disassemble the engine and scare you off.
First, do you really have a problem with preignition causing real knocking due to carbon buildup, or diluted gasoline or do you have failed knock sensor(s).  Try to decarbon the engine first.
There is a technique used with water being sprayed into a warm engine intake.  This will clean up the valves and carbon buildup which can result in engine knocking.  

The job will be a couple hundred for the parts and a couple hours of your time.  After you are done, you have entitled yourself to approximately $500 in new tools for your tool chest since this is what Toyota and Lexus will charge to fix (about $1k+).

You will need to buy the following to address the knock sensors and a couple other items while you're in the neighborhood.
- 1x upper intake plenum gaskets - 2x lower intake plenum gasket - coolant bypass hose found in the same area as knock sensors - 2x knock sensors (bank1 and bank2) - short pig tail cable which connects both knock sensors to common wire harness. - toyota antifreeze  (2 gallons, if i remember correctly... when mixed to 50/50 (antifreeze/ water) you will have 4 gallons.
drain the radiator drain the front of the engine using the engine drain plug - this plug is on the front right side facing the engine, behind the right hand exhaust manifold. (this will lower antifreeze enough to avoid dumping antifreeze all over the engine later) remove the air filter box remove the connections into the throttle body remove the cable from the throttle control remove the upper air intake plenum remove the two lower air intake plenums remove the antifreeze fill port
Knock sensors will be in the valley between the lower intake plenums.  You will need to remove the rubber antifreeze bypass hose (little short hose blocking access to the knock sensors).
By the way, the reason you bought a replacement, is that if this short hose splits from normal wear, you need to spend this money and effort to reach it, so just do it now.
The little pig tail cable which connects both knock sensors to the wire harness is said to cause a big majority of the problem due to the plastic getting hot and brittle, falling off and shorting to the engine.  While in this mode the engine thinks knock is occuring and starts to retune the air fuel mixture to get rid of the knock until it goes into minimal operations mode.
After replacing the knock sensors (and tighten to torque specs), replacing pig tail cable, and reinstalling your new short by pass hose.  Replace the lower gaskets, antifreeze fill port, lower intakes, upper gasket, upper intake, air intake, air filter, reattach everything, reconnect all the rubber lines you pulled off, make sure there are no splits in the air intake passage anywhere, retighten the engine antifreeze drain plug, and the drain on the bottom of your radiator, and your done!
Don't forget the easy stuff.  Dilute the antifreeze with water and fill the radiator and overflow tub.  Run the engine for several minutes until its hot and opens the thermistat to allow antifreeze into the empty engine cavities.  Turn the engine off and get a cold one as the engine cools.  Once absolutely sure engine is cold, refill the radiator with antifreeze and refill the reserve tub.  Do this at until all the beer is gone and you are both full of antifreeze (in one form or another)..... obviously red stuff in the car, amber down the gut.

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