Dear C-Max Owners, Mechanics, Engineers, Technicians, Experts,
I am a new man here.
We have try to find the reason by many way, but no results!
Please help Me to find it! I am so dissapointed because i am not able to utilize the power resource of my 1,8 CSDB petrol engine.
So My ca( r )n is a Focus C-Max 1.8 CSDB, Petrol, 2004.
When the weather is colder, under 28 degree C. everything OK. But if the temp rises over 28-30, and the engne get operation temperature, the engine forgets to give me its hosres to work. I feel fear when i need to climb on a hill road. Especially when the car is full of my family, and we need AC too. In this conditions the car totally out of the power, and it becomes very very difficult to start from stationary. Like 80 HP for 1600 kg. (instead of 120 HP)
About the symptom:
If the ambient temp rises over 28-30, and i push the pedal little more agressively, i hear unusual noise simultaneously with the engine sound, (according to my mechanic like the engine unable to suck the air), and from that moment the car get out of its power. From that moment I know, that i need to make lighter my foot.... The problem becomes constantly presented from that FIRST moment. It goes if the temp is falled down under 28-30 Celsius.
If the weather get colder the horses come back to make me feel ok, eigter in same day or same trip whitout a stop. There is a very tight transition range, time etc... between becaming good to bad, or becaming bad to good operation.
-20 to 24 deg C. Very good performance.
24 to 28 deg C. Little power loss.
over 28 - 30 deg C. No power.
What we try already:
- MAP changed.
- Valve gaps checked(cold, warm). Perfect.
- Timing ok. New chain and guides.
- Lambda ok.
- Cat. Ok.
- Butterfly ok and cleaned. Potentiometer(s) are ok. Pedal also.
- Vacuum and pipes are ok.
- IMRC and swirl flaps are ok. (Brand new solenoids)
- Theoretically everyting looks good. The "correction values" are also OK when we monitored with ODBII reader. So there is no fake or bad values by any sensors.
- Oil and coolant level ok. Oil quality and visco ok. No oil consumption.
- No extra fuel consumption.
- KAM reset done. 2x
There was a piston ring replacing and head upgrading 5 months ago, because the engine ate the oil. 2 liter/1000km.
but now is perfect.
Ther was a coolant sytem leakage 3 times in 1 month 3 months ago, because irresponsible and bad quality repair. (O -ring replacement close to the inner radiator.)
The head temp never gone over the trip-, treshold limit but the 75% of the full amount of coolant gone each time.
There are no (were not) DTC-s.
I can use ODB reader, HS-MS mode too.
I monitored many parameters for many days, but there are no differences between the normal and the faulty operations. I focused on the butterfly control, the temperatures (IAT, head, cooland, ambient.) and ignition angles. The intake air temp by the time stabibized 40+/- 5 celsius over ambient constantly. Is this normal? Example after a hour drive: IAT-78 deg C, Ambient: 33 deg C., Coolant: 93 deg C., Head: 113 deg C.
There are no missfires, or lambda error. No reach or lean mixture. Results of the Catalyst and EGR selfdiagnostics also OK.
So there is a huge problem which comes with the ambient temperature rise and goes with the temperature fall.
It comes with the ambient rise only.
About the ECU:
Module type: ESU-121
Firmware version: v.15(14.12.2004)
Firmware number: UHDCAJ7
Maybe firmware update could solve the problem?
Ohh, i bought this car in last september in the autumn season so i have no infomation about last summer, hot season...
If You have any suggession, do not hesitate to share with me!
Maybe PID-s to monitor? Special drive condition or drive behavior to monitor?
A complete log about a trip. O2, Temps, Driving behaviors, etc...