Skip the auto shop - Our mechanics make house calls

Q: My Toyota 5L smokes black when gooing uphill and loses efficiency. What could be the problem?

asked by on

my toyota 5 litre diesel smocks black on going up hills and reduces efficience. this normaly happence together with delayed gear changes being an automatic vehicle, the rave counter will go up to 4 instead of normally 3. however on straight roads it normally changes on 3 but when going on up hill i have to rave up to 4. when it changes to the next gear the smoke stop. i have recently changed the air filter after the warning sign had appeared but the sign could not go off. a mechanic has advise me that i have to disconect the battery for a while for the air filter warning sign go off. what could be the problem for the above.

A: A diesel engine spewing black smoke is gene...

A diesel engine spewing black smoke is generally caused by ignition timing that has been retarded too far or a large amount of unburned fuel leaving the engine. A failing turbocharger that is not putting out enough boost may cause the engine to run very rich under load and spew black smoke.

Consider hiring an experienced technician like one from YourMechanic who can come out and take a closer look at the black smoke problem and offer a more personal diagnosis.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Sometimes car has trouble starting

Hello! I suggest that the crank and camshaft sensors are tested by a computer or multimeter to verify if they are at fault. If they are not at fault, I would look towards other things, such as a clogged fuel...

Q: Hello! Planning to go for 2015 Chrysler 200 preowned, please advise.

Hi there. When you are wanting to purchase a vehicle that is preowned, you would want to do a few things. First do a research on a the vehicle that you want to buy and see how much it costs...

Q: Ticking sound on drivers side

Deficiencies of various types can cause lifter and valve train noise, including ticking noises. The bottom line is if the ticking noise did not exist at all prior to their work on the valve train, but occurred immediately at the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.