Question about 1994 Toyota Land Cruiser

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Water/coolant leak above catalytic converter

It does have rear heat

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  • ron_b24 Jan 13, 2009

    there is also a loud clunk when i let off the throttle or when i stomp on the gas, i think it might be an engine mount or tranny mount. slow throttle response.

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1 Suggested Answer

RudolfDiesel
  • 100 Answers

SOURCE: water/coolant leak above the catalytic converter

If your having to add coolant
Then this is a line running back to the rear heater core,
if this is by the exhaust id recommend replacing it with a steel line /ruber hose might not handle the heat.
RD

Posted on Jan 13, 2009

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My truck is using alot of water. I have not noticed it leaking on the ground. But I can always tell the water is low when my heat stops working. I add coolant & the heat works again. Where could t


The heat stops because there is not enough antifreeze to run through the heater core in the cab. The symptoms you are describing sound like the head gasket is leaking antifreeze into the cylinders and it is turning to steam a going out the exhaust. You need to check the oil and be sure that it is not milky looking. That would mean that the coolant is leaking into the oil pan too and that is very bad. Also you need to know that antifreeze will destroy the catalytic converter and it wont pass emissions. You are looking at several thousand dollars worth of repairs.

Dec 08, 2014 | Cars & Trucks

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Reoccuring Coolant Leak - Now major leak


The Jaguar XK8 has a coolant hose on the rear of the engine that is prone to leaking. The leak is typically on the right side, right above the catalytic converter. There is a quick disconnect fitting that has an o-ring in it. This O-ring fails with age, and the coolant leaks from the connector.

Apr 28, 2012 | 1998 Jaguar XK8

1 Answer

My 2000 Cadillac Deville engine light on. Engine code PO420


Catalyst System Efficiency Below Threshold (Bank 1)

A code PO420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of reading

  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter

May 11, 2011 | 2000 Cadillac DeVille

1 Answer

1995 volvo 850 keeps over heating


Check coolant levels. Look for leaks around hoses and engine block. make sure hose have pressure when vehicle reaches running temp.Replace thermostat . If none of the above is the problem you may have a clogged catalytic converter.

Sep 13, 2010 | 1995 Volvo 850

1 Answer

Engine code 430 for 2001 toyota highlander


Possible Causes:
Oxygen (O2) sensor not working correctly
Damaged or leaking exhuast (pipe, manifold, catalytic converter)
Damaged catalytic converter

Diagnostic Help:
To diagnose a P0430 trouble code we begin by checking for exhaust leaks under the vehicle. Then use an oscilloscope to check the waveforms of both upstream and downstream O2 sensors. The rear reading should vary, the front should be steady. Replace as necessary. Check the rear Heated O2 Sensor. Check the catalytic converter, replace if necessary. If necessary, check for wiring and component. hopes this helps thanks

May 30, 2010 | 2001 Toyota Highlander

1 Answer

Po420" Problems 1996 plymouth van


A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings

Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter

Oct 19, 2009 | 1996 Plymouth Voyager

1 Answer

PO420


Not just a faulty catalytic converter will trigger this code. Many other issues can trigger this code.

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Delayed spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
Possible solutions:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter.
  • Replace Coolant Temperature Sensor
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2)
  • Replace the catalytic converter
  • Have timing adjusted


Aug 25, 2009 | 2002 Toyota Camry

2 Answers

OVERHEATING


This could be a multitude of things:

Stuck closed thermostat.

Cooling fan not coming on.

Clogged radiator.

Low on coolant.

Water pump failing/leaking.

Head gasket blown, leaking exhaust into antifreeze.

Clogged catalytic converter.

Thermostat: If the Van heats up, then feel the upper radiator hose. If it's cold, then your thermostat is closed. Replace thermostat.

Coolant: If low, simply fill with distilled water and coolant. Low levels will let engine over heat.

Radiator: If there are cold-to-the-touch spots on the radiator after it should be warmed up, then a clogged is probably occuring. Have radiator flushed.

Head Gasket: If you smell exhaust fumes in your coolant reservois tank, then you got a blown head gasket.

Cat Converter: Only can be tested if off the car. Or you could try a non-contact thermometer. These are also good to testing cold spot on radiator or if thermostats are open.

Cooling fan: If mechanical it'll be spinning. If electrical, it should come on automatically with the A/C, or when it gets hot.

Water pump: Will be leaking from the front if it needs replaced. On a van, it's a tough job.

Good luck!

Feb 10, 2009 | 1995 Ford Econoline

2 Answers

Water/coolant leak above the catalytic converter


ToyotaEd can. click the name and ask him direct.
Thank you

Jan 13, 2009 | 1994 Toyota Land Cruiser

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