Question about 1999 Cadillac DeVille

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Engine overheated; replacement engine with so called 100,000Km, exibits same problem, Coulant disappears through exhaust, at rate of 1 US gal. per week with little milage.

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Possible blown headgasket on replacement engine, there is a special tool available from NAPA THAT IS EASY TO USE AND IT WILL TELL YOU IF YOU HAVE EXHAUST GASSES GOING INTO THE COOLING SYSTEM

Posted on Aug 22, 2010

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Do I chanage water pump when changing timing belt on 2002 lexus GS300?


Hi there,

Most Japanese designed engines have an internally mounted water pump, usually driven by the cambelt.

When we talk in terms of cam design, there are two types of engines: a) Interference and b) non-interference.

An interference egine means - if the cambelt were to break whilst engine is running, there will be major internal engine damage.
A non-interference engine means - if the cambelt were to break whilst engine is running, there will NOT be any serious internal damage to the engine.

Note: the GS300 engine (3.0L 6-cyl) is considered a Non-Interference engine.

So, one of the most critical compenents which MUST be changed, is the cambelt itself. Most manufacturers recommend changing this belt every 90,000 - 100,000km's (80,000 miles). If you have a non-interference engine, this period is not as critical, but should still be changed soon, to avoid the inconvenience of a breakdown whilst travelling.

The 2nd critical compenent is the Water Pump. The worst possible outcome of a failed waterpump, is your engine will suddenly drain of all coolant, resulting in serious overheating, causing serious internal damage to your engine.

Although there is no specified time to change the waterpump, a waterpump endures wear and tear like any component and lifespan can reduce rapidly beyond 100,000km's (80,000 mles). As the waterpump is situated next to the cambelt, it is a general rule to change out both cambelt and waterpump at the same time.

The majority of the cost to replace the cambelt, is in labor (ie opening the engine etc). If you choose to replace only one of these components, you will need to be prepared to pay for same procedure again in future, to replace the 2nd component.

Therefore, it can be more economical in the long term, to have both components changed together.

Hope this helps...


Scott




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May 30, 2011 | Lexus GS 300 Cars & Trucks

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On a 2001 mazda bravo turbo disel when do I have to change the timming belet it's done 176000 ks


Hi there,

Without knowing which diesel engine you have, I'll have to guess that you have a 2.5L (B2500) - Note: the more detailed information you give us, the more accurate our answers will be :-)

As a general rule, cambelts (with tensioner assembly & seals) have a limited life and should always be replaced every 100,000km, or sometimes earlier depending on manufacturer. The reasoning behind this is that most engines will suffer major internal damage if the cambelt snaps (this is what is meant by 'Interference' engines). As the engine has to be opened up to carry out this service, it can be a costly maintenance. For this reason, it is also common to replace the waterpump at the same time (to avoid having to open up the engine again) as waterpumps have been known to fail beyond 100,000km.

The good news....if you DO have a 2.5L (B2500) engine, then this engine is a NON interference engine - which means, if the cambelt did snap, your engine would not suffer any internal damage, compared to interference engines.

Hope this helps.....


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Engine light is on on the dash? car is very


usually have to download trouble codes to see what has logged a fault,but if sluggish usually caused 1/by a bad coil on top of one of the sparkplugs. 2/sparkplugs worn(these should be platimun and are good for up to 100,000km).3/faulty oxygen sensor.4/blocked fuel filter(car will usually run fine but lacks power).5/restriction in exhaust(catalyic convertor damaged by overheating from above faults).6/moisture in sparkplug/coil area from washing engine down or going through road water.Does car run smooth,but is slow(see 4),or does the exhaust note sound flat and 'chuffs' at idle?(see 1,2,6)hope this helps or will need some more detail of how it runs and sounds.Fault codes may need to be cleared by using the appropiate scan tool,either factory tool or many others used by garages or can be hired/purchased.Some trouble lights will go out once problem is eliminated

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What is the approx cost to replace engine?


$500-$1500 for a used motor. $300-$500 labor.

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Location of oxygen sensors on 2002 dodge grand caravan with 3.3 liter engine after considerable maintance work done by a dodge dealer my gas mileage dropped by as much as 6 to 8 miles per gal. after a time...


The o2 sensors are located on the exhaust system.The upstream in on the rear exhaust manifold and the down stream is in front of the catalytic converter.Usually when they are bad they will make the check engine like go on.Make sure the air filter is clean,tires at correct inflation,alignment is to specs.If the vehicles pulls to one side or the other or steering wheel is not straight when driving down a straight stretch of road.Also tires are wearing normal.Use cruise control where ever on highway.If you let your vehicle warm up in winter.This also uses gas.Hope this helps.Good luck.

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Overheating - Not holding water


Check your engine oil. If there is fluid in it (radiator fluid)....bad.

Do you have smoke...white (not billowing, but like it disappears)....from the exhaust?....bad....

Head gasket is bad.

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