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Fan coming on when engine cold


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Cooling fan - is your aircon on?

Starting if using Easystart (don't overdose with that!) suggests there's a spark at the correct time and compression. That would lead me to a fuel, or lack of fuel issue?

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Once started does car run normally ?

Do you have your AC on ?, ac will make fan cut in out even if engine is cold.

There is a bulletin for hard starting of 1.0 Pre facelift Mk2 Aygo & Yaris

EG-00036T-TME Version: 1

Subject: 1KR-FE Engine: Hard to start

Models - Model Codes: Aygo - KGB40; Yaris - KSP90, KSP130

Component & Model features: 1KR-FE

DESCRIPTION OF THE PHENOMENON Some customers may experience and report difficulties to start the engine after parking. Engine may take longer than 3 seconds to start and DTC P1604 will be stored. Many different factors can affect engine start-ability, but the scope of this bulletin is exclusively for cases where root cause is high concentration of carbon deposits.

Example of carbon deposits on piston surface.

image.thumb.png.07cccff6d6d179a7770b181cacf41865.png

Carbon deposits are not abnormal inside combustion chamber, but some of the existing fuel additives in the market can affect deposits concentration in terms of amount and size. Once those deposits flow through the exhaust valves, the biggest ones could remain between the valve and the valve seat creating a gap. This gap causes lack of compression and consequently, difficulties to start the engine.

REPAIR PROCEDURE This bulletin is exclusively applicable for hard to start cases caused by carbon deposits. If that is not the case, please follow the procedure on the repair manual.

 

image.thumb.png.2230ef03a25d4e14fa48ff3d6a926627.png

REPLACE STARTER AND Battery AS INDICATED BELOW:

1. DISCONNECT AND REMOVE THE Battery.

2. REMOVE THE STARTER AS INDICATED IN THE REPAIR MANUAL.

3. INSTALL THE NEW STARTER AS INDICATED IN THE REPAIR MANUAL.

4. WHEN APPLICABLE, REPLACE Battery TRAY (ONLY FOR YARIS).

5. INSTALL THE Battery.

6. IN CASE OF AYGO (ONLY), WIRE CONNECTED TO BATTERY'S POSITIVE TERMINAL MUST BE TURNED AROUND 90 DEGREES TO MAKE ROOM BETWEEN THE WIRE AND THE HEATER HOSE.

7. END OF PROCEDURE.

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Hi, I would go with Stantheman's idea of the MAF sensor. First off disconnect and clean the plug, Secondly remove and clean the sensor (it wont like (EasyStart) if no fix then replace it.

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