Question about 1999 Chevrolet Tahoe

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Loss of power

I cant figure out whats wrong with my truck the mufflers sound like they are clogged up or broke but they are not its wasting lots of gas, first time it did that i changed the spark plugs it got better few months later it did that again so i changed the distubuter cap it got better couple of months later its doing it again so i bought a fuel pressure regulater do you think that might be it or is it something else it has no power and you can smell a little exaust inside when you drive it can you help

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You need to get the Catalytic Converter Changed. That is the Problem.

Posted on Jan 17, 2009

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Check the catalytic converter it sounds clogged

Posted on Jan 17, 2009

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What is the cause when toyota hilux 2.4d 2b engine loss power and make lot of smoke and using too much oil?


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What are and were the codes? Were the catalytic converters replaced? Sounds like the typical clogged cats. It could be the cats broke apart and clogging the exhaust system. My scanner tells me much.

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lost power is 99% of time just that, not doing service on car.
and is very common,.... so....did you?
spark parts and filters?
lost power can be misfiring or bogging,
misfire is violent and spark.
bogging (smooth) is loss of fueling.
stalling is same
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So many things hard to list them all. Vacuum leaks, tune up parts, bad ignition module, clogged cat converter or muffler, low fuel pressure, leak between MAF and throttle body, bad coolant temp sensor, leaking head gasket, others.

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If it seems to have a loss of power you may have a clogged exhaust, (muffler) system, again if you have a loss of power or it runs ruff check for a vacuum leak.

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Just Failed my emission test......hc ppm reading 485 allowed 189 also CO% 10.50 ALLOWED 2.36 WHAT CAN I DO TO CORRECT.


sounds like a bad catalytic converter, just did my 1985 Jeep could not get it to pass ended up replacing the catalytic converter, muffler, ox sensor and EGR valve then Jeep passed with flying colors.
if your cat is bad it reduces your exhaust flow causing loss of power and increases fuel consumption.

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My muffler fell off today and its louder but i have a rough idle now what is the muffler why is it doing this. its also loss of power


your muffler not only reduces sound but also tunes the flow of exhaust gas,so if it is missing, all the engine tune is put out completely,replace asap so that you run quiter and use less gas.(F1 racing cars have a length of pipe that is cut to an exact length to give max power...)

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Loss of power on acelaration


There's a lot on any car that can cause loss in power.
A few of them are:
Mass air Flow sensor
Bad O2 sensors
Old oil or sludged oil
Bad Gas
Clogged catalytic converter
Loss of cylinder pressure or compression

I would start with the cheapest tests/fixes first
oil: if you haven't already and don't know the condition of your oil, change it. If your oil has sludge in it then you could have a leacking head gasket.

Next up, If your gas is bad fill the tank about half way and use lucus oil octane booster, and for a second half a tank pour in some seafoam engine cleaner. It will clean your fueling system, injectors, and pistons/chambers.

If those too don't help: get a compression test on the cylinders. Not expensive to have done, but could be expensive to fix if there is something wrong or the compression is leaking.

Next, go to a muffler shop and have your catalytic converter checked. A clogged or bad Catalytic converter may trap exhaust and keep it from exiting your exhaust system.
While your there you can have your O2 sensors checked.

If all of that is fine, replace the O2 sensors and the Mass air flow sensor. These components control the air fuel ratio. If they are going out your engine won't ever get the right amounts of gas and air to run properly.

It's a lot, but my general rule of thumb for trouble shooting any issue with a car is to start with the cheapest fix and work your way up.


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