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tims auto repair
tims auto repair, mechanic
Category: Toyota
Satisfied Customers: 12916
Experience:  owns a repair shop....25 years
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code P0300,P0301,302,303,303. come up only on cold start after

Resolved Question:

code P0300,P0301,302,303,303. come up only on cold start after warm up car runs good
Submitted: 11 months ago.
Category: Toyota
Expert:  tims auto repair replied 11 months ago.

Hi,My name is Tim,

I will do my best to assist you

from the way you explain ..it sounds as if you may need to replace the plug boots,,this is what comes from the coil and covers the plugs,,these will get old and jump a spark sometimes

graphic

 

Customer: replied 11 months ago.

The coils were replaced with new boots attached. The motor stutters on start-up with decent idle speed butthe idle goes down so low that multiple missfires occur. By pressing on the accelerator and holding above 1,000 rpm for approx a minute and the engine warms missfires cease. I am using a scan tool.

Expert:  tims auto repair replied 11 months ago.
ok
what may be going on here,,is the ect[engine coolant tempeture]sensor..the computer may think the engine is always warm,,thus,not giving it enough fuel when warm
Customer: replied 11 months ago.


There is movement of the coolant temp according to the dash gauge and the scan too. I am not next to the car now however i could get the readings in approx. 30 min..

Expert:  tims auto repair replied 11 months ago.
ok
another thing you may want to try here..is to remove and clean the iac[idle iar control]motor with carb cleaner,,these can get dirty with black soot and cause this
thanks
graphic

Customer: replied 11 months ago.

I'll check it out. By the way the car has only 25,000 on it!

Expert:  tims auto repair replied 11 months ago.
but,it is 11yrs old..be sure also to check for vacuum leaks
thanks

Customer: replied 11 months ago.


I've cleaned the idle air control. It worked better but the final test will be tomorrow morning. thanks for your help so far.

Expert:  tims auto repair replied 11 months ago.
you are very welcome
let me know how it gos
thanks

Customer: replied 11 months ago.


I started the car up earlie and the initial idle was approx. 1200 rpm and it declined to approx. 900 in about 15-20 sec then declined to under 600 rpm and began to stumble.. When restarted with my foot on the accel. for about 30 sec it ran fine and now that its warmed up it starts fin and idles fine. A side note..if i put the ac on it runs better so i'm thinking of replacing the iac. Your thoughts? So far you're helping alot and am very well satified.

Expert:  tims auto repair replied 11 months ago.
yes..it is very possible that the iac is bad....
replace it
thanks

tims auto repair, mechanic
Category: Toyota
Satisfied Customers: 12916
Experience: owns a repair shop....25 years
tims auto repair and 6 other Toyota Specialists are ready to help you
Customer: replied 10 months ago.


Because of the price of the throttle body and iac which is built in unlike the diagram pictured, it was not replaced but entirely cleaned.. The car started great and ran great for two days. Now, one and a half days later the problem is back. Any other ideas???

Expert:  tims auto repair replied 10 months ago.
ok
sense the cleaning did help...there is a high possiblility you may in fact need to replace it,,try cleaning it once again..but,,expect to buy one
thanks
Customer: replied 10 months ago.


Tim.


The repair to the toyota was to drain the gas tank and clean the fuel line and all. thanks for your aid.

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