Engine Has No Power

[firstlex01]

hey there, ok i have a 2001 is300 and this has been a ongoing process of trial and error!! the situation: the car has no power! the car starts up with ease and idles with ease, but the second you put any throttle the car wants to BOG. any amount of throttle it will do this in park! and when in drive the same thing happens, the car has zero acceleration and it sounds like it want to die but wont! its really sad that its doing this and need to get it fixed!

what i have changed is:

fuel pump, and spark plugs! nothing has worked so far, and would like to know what the next step would be

also there are engine codes also, this is what i got:

P0171

P0174

AND AGAIN,

P0171

P0174

please help me and thank you again.

[true blue]

Hi seeing as no one has come forward with a reply ; all I can tell you is these 2 codes refer to a weak mixture ( 0n banks1 and 2 ) I would check the obvious things first air leaks altering the mixture or any loose pipes or connections .Have you disturbed anything ? how did the fault manifest itself? did it just happen without warning or was it after some work was carried out. Sorry I can't be more specific

[ROYT]

Hi seeing as no one has come forward with a reply ; all I can tell you is these 2 codes refer to a weak mixture ( 0n banks1 and 2 ) I would check the obvious things first air leaks altering the mixture or any loose pipes or connections .Have you disturbed anything ? how did the fault manifest itself? did it just happen without warning or was it after some work was carried out. Sorry I can't be more specific

And my two pennorth', have the fuel line pressure checked..

[fjcfarrar]

Hi seeing as no one has come forward with a reply ; all I can tell you is these 2 codes refer to a weak mixture ( 0n banks1 and 2 ) I would check the obvious things first air leaks altering the mixture or any loose pipes or connections .Have you disturbed anything ? how did the fault manifest itself? did it just happen without warning or was it after some work was carried out. Sorry I can't be more specific

Although you would expect other codes, it seems like the car is in limp mode. I would check the Lambda sensor(s) which fit somewhere on the exhaust manifold/system and massively affect the mixture. I don't know if there is just one or separate ones for each bank. If you have a meter, make sure it (they) are not open-circuit as a starting point. Otherwise, unplug and replug all the connectors on the engine and to the ECU if you can get at it - there may be dirty connections which can lead to both problems and/or incorrect codes. "Working" connectors can often clear bad connections. Other wiser people can advise if you need to reset the ECU after this and how to do it.