Mechanics

MY CAR DOESNT IDLE WHEN YOU START IN THE MORNING SO ENGINE SHAKES TILL IT HEATS UP THEN IT STOPS, SECONDLY WHEN I TURN ON THE A/C THE RPM GOES DOWN

2000 Lexus GS 300 • 124,000 miles

Cars has undergone alot of changes with new wiring etc etf
Avatar
Martinkodua
February 14, 2012.



Yes, the throttle motor is responsible for maintaining the idling speed when additional loads such as A/C and headlights are turned on.

KHLow2008
Feb 16, 2012.
Hi so sorry I havent contacted you about my car I haven't had time to do it but hope to do it this weekend and get back to you. Thank you very much for the help.

Tiny
Martinkodua
Feb 21, 2012.
Hello, its been a long time but I have been able to sort out some of the problems with my car, the transmission has been fixed now Gears change well and I bought a used Throttle body and fixed on my car but I havent seen any improvement with the idling in the morning. Because when I start the car in the morning engines shakes because idling is very low, also I think my car has started consuming fuel. What do you advise please? Thank you

Tiny
Martinkodua
Sep 12, 2012.
Did you clean the throttle body before installation. Used throttle body cannot be trusted to work correctly as long storage can cause the IAC spindle valve internally to get stuck.

Have you recheck for trouble codes?

KHLow2008
Sep 13, 2012.
No, I didnt clean the throttle body, I would buy a cleaner today and clean it. When I checked for trouble codes, it came up with my oxygen sensors not working even though I have changed all 4 and also it came up with errors like Cylinder 1 misfire, Cylinder 6 misfire, Cylinder 4 misfire etc. When I clean the codes they go off and come again the next morning mainly because when I start the car in the morning, the engine hunts (hun hun hun hun)till when it heats up then it stops. I would clean the throttle body and get back to you.

Tiny
Martinkodua
Sep 13, 2012.
Do you have overheating or coolant losses issues?
Are the symptoms exactly the same as before replacement of the throttle body?

KHLow2008
Sep 13, 2012.
No I dont have overheating or Coolant issues, the symptoms have changed since I changed the throttle body and I have just cleaned it this afternoon. I also have rapid or multiple misfire and also Evaporative Emission system switch/sensor.

Tiny
Martinkodua
Sep 13, 2012.
When you have any trouble codes, you must let me know what they are so I can understand what is wrong.

If the valve clearances are too tight, it can cause idling problem so if you have not cheecked them, I would suggest doing so.

KHLow2008
Sep 13, 2012.
The error codes I have are P0120, P0161, P1120, P0300 and P0450.

Tiny
Martinkodua
Sep 14, 2012.
I erase this codes every day and they still come back

Tiny
Martinkodua
Sep 14, 2012.
Page 2 of 5