My car doesn't idle when started in the morning

The poor idlign during initial startup indicates the cold start system is not working correctly.

If the MIL is indicating, get a scan done and let me know the EXACT trouble code.

If you do not have any trouble codes, get the throttle body and IAC cleaned and retest.

Thank you very much, would check that now, secondly can you also give me a picture of how to fix the vacuum hoses just around where the actuator is. Thank you

I am not sure which actuator you are referring to so I have included all the various vacuum diagrams and schematics available in our database. Hope ithey are helpful.

Thank you very much, i would let someone take a look and explain it to me, its the 4th picture but i dont seem to understand it well. And the codes are P0758, P0135 and P0155. The Vacuum hoses comes from a small black round bottle just above the Starter and i dont know where those two hoses connects to

If you can't get anybody to explain the thing to you, snap a few pictures of the intake manifold and I will try to explain to you.

P0758 is a fault with the #2 solenoid of the transmission.
P0135 and P0155 are faults with the Or sensors.

Hello Please see attached picture from my engine. There are two holes coming from a small bottle i think thats the vacuum tank but i dont know where the hoses goes to including the one coming from underneath the air intake chamber

I can't see the surrounding of the vacuum but the hoses in the diagram seems to be the vacuum source from the manifold and the vacuum. If that is the case, the upper hose in diagram is the vacuum source and it goes to a vacuum switching valve which should be somewhere near the vacuum tank. Where does the vacuum tank hoses lead to?

I studied your 4th diagram today and have able to solve the vacuum hoses. Now my next problem is when I put on the a/c my idle goes low instead of going a little bit highto power the a/c effectively and finally where is the cold start for my car? Bcos when I start in the morning the idle goes up and comes down so quickly that the engine doesn't heat up so it shakes till it heats before it becomes normal.

The IACV system is the one you just fixed.

Ensure the circuit is working correctly.

Check the throttle control motor operations. Ensure throttle body is clean as dirt accumulation inside throttle body can cause erratic idling.

I have cleaned the Throttle Body, would check on the throttle motor and get back to you on this one. You have been very helpful, I would definitely send a donation but i dont have a credit so we would have to find another way of donating something to you. Secondly when i turn the a/c on isnt there supposed to be something like an actuator which should raise my idle?? I still seem not to understand why went i switch on the a/c my idle goes down which makes the engine shake, is this also a problem with the Throttle motor please??

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

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.

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

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?

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.

Do you have overheating or coolant losses issues?
Are the symptoms exactly the same as before replacement of the throttle body?

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.

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.

The error codes I have are P0120, P0161, P1120, P0300 and P0450.

I erase this codes every day and they still come back

P0120 - Throttle Position Sensor (TPS) circuit malfunction.

P0161 - Heated HO2S sensor heater circuit, can be either a bad sensor or missing power supply.

P0300 - Random cylinder misfiring detected. Possibly related to P0120 and P1120.

P0450 - EVAP pressure sensor sensor malfunctioning.

P1120 - Accelerator Position sensor ciruit malfunction.

P0120 and P1200 are the main problems you need to address before you go to others. Both are critical for engine performane and idle controls.

These problems were not mentioned in earler post so I guess they were a result of you working on the vehicle. Recheck the wiring connections and ensure they are clean and secure. Ensure connectors are correctly plugged in and you would need to perform diagnostics if you can't find any faults, which would be easier if you have a scan tool.

I have a scan tool, anytime i erase them, they seem to come back again after driving for a while, i would do suggested and i hope something good comes out of it.

do you have a diagram of how to connect to O2 sensors? maybe i may have them in the wrong connectors

Here are the schematic for the O2 sensors. Ensure you have battery voltage to the Black/Red wires with ignition switch turned on.

Thank you very much, I would print this and send to my electrician to help me out. You have helped me since i started fixing this car and i dont want to be ungrateful so I would like to donate something but unfortunately am in Ghana but my brother is in the US. Do you have paypal? I can authorize him to donate $20 for now. Also is it possible to send me any other schematics you think i may need by email, I cant seem to download this to print. if its possible my email address is [email protected]

Yes, you can donate via Paypal. Tell whomever is doing this to click this post and click the " Upgrade Question " link to proceed with the donation.

I will send the engine management wiring schematic set to your email.

Thank you for the donation.

Am doing this myself so if you can give me your paypal address, i would let my brother donate the $20 on my behalf.

My internet connection to our database is rather lagging presently so it might be a while before you get the documents.

Please do you have the schematics of the vacuum system for the car so i can cross check all hoses to be sure they are in the right places. Thank you

Refer to my February 15 reply for the vacuum diagrams.

Hello Low, is it possible to make the schematics bigger? the font are too small I cant seem to read it well and same as my mechanic. Thank you

Those are in PDF mode so you should be able to enlarge the view. Sorry I don't know how to make them larger when converting from Onenote to Acrobat and if you know how, tell me and I will see what I can do.

Hi, am getting so frustrated with this car now, I really dont know what to do anymore. I have just been told by a mechanic that the throttle body needs to be programmed to control the idle speed. Is this true? If so please let me know and if you know how to do it let me also know. This are the recent codes i have P0161, P0130, P0133, P0150 AND P0153

P0130, P0133, P0150, P0153 and P0161 are all faults with the HO2S circuits. Either you have a fault with the wirings or the sensors are not working.

None of the codes are related to the throttle controls which do not need any programming. The computer would relearn after some running and the O2 sensor codes are not going to make that occur. You need to get them resolved first.

If you had removed the TPS or meddled with the throttle control stop screws, recalibration would be necessary.

How do i recalibrate it??

There are many things that needs to be taken into considerations but I would suggest getting the trouble codes rectified first. No point in going on a wild goose chase.

The reason why i was asking about recalibrating the Throttle is because someone has tampered with it and another mechanic is trying to charge me about $150 to calibrate it for me

Don't worry about that first. Get the O2 codes resolved first.

I still cant enlarge the schematics you sent to me, you said they in one note format, please send them to me via the one note format and let me convert it here and i hope I can increase the font. I have someone coming in tomorrow to check on the O2 sensors for me. Thank you very much

I have sent the files to you, hope they come out better. I thought pdf files can be enlarged?