in urgent plz , have black smoke come out of my Lexus SC 400 back ,any one can help me?

Question

I have black smoke come out of my Lexus SC 400 back ,any one can help me? nothing happen at all when I take off the air sensor electric connection ,or there any website that I can find the info to help me out ? this my Q

Answered by MR.Gordon B
It sounds like the automatic choke (or cold start fuel enrichment valve in an injected car) is stuck. Black smoke indicates unburnt fuel... This should only be happening after it has run for a few minutes and warmed up.
The connection to the vehicle computer may be bad, not allowing the induction mixture to lean after warming up.

answered by Mr. Doug K

Black smoke from the tailpipes is indicative of your vehicle running extremely rich (too much fuel.) Any good mechanic should be able to narrow that down using typical troubleshooting techniques. More than likely a sensor has gone bad, or a connection to a sensor is loose, but that is any number of sensors or combination of sensors. Get the car scanned with a CEL (check engine light) code reader to help find the problem.



My New Q to every one can help me !
its true ,I have the black smoke as soon I start the car at cold status, and it stay smoking even when it warmed up , the automatic black choke located on the center of the motor I have take it off and see that its working good , can you help me out to find A troubleshooting techniques of making shore if the induction mixture sensor working and leaning the mixture after warming up ! about the (cold start fuel enrichment valve) ist the one located on the right up of the motor with the water hose connected to it ? plz help :) the car is imported from the states and in its year made it never been imported by the local kuwaity Lexus dealer so there is no code reader for it and even they do not allow it to be troubleshooting at the service center cose they do not have the maintenance Manuel or the code reader thanks allot in advance for your very kind help .

Answer 1

Bad throttle position sensor telling the computer that you have the gas pedal pressed down and it thinks it needs more gas.

Where the throttle cable connects to the engine is a half moon shaped thing with two small screws holding it on.
Unplug wire harness to it and start it up again.

Answer 2

Black smoke from the tailpipes is indicative of your vehicle working quite rich (too lots gas.) Any solid mechanic could be waiting to slender that down using oftentimes used troubleshooting innovations. greater desirable than in all danger a sensor has long previous undesirable, or a connection to a sensor is loose, yet it extremely is any type of sensors or mix of sensors. Get the vehicle scanned with a CEL (examine engine mild) code reader to help discover the difficulty.

Answer 3

Its burning to much fuel. Check it's carburetor.