Thread: Hey Mate´s just want ro say hello, and of course i have a problem :-)

There are a couple of knowledgeable and helpful posters on this forum that will explain it better than me, but in the meantime:
The 97 V8 is fuel injected, so the mixture is controlled by the ECU. There are several inputs to the ECU that will affect the mixture, but one of the first ones to check would be the engine temperature sensor. This input increases the mixture when the engine is cold, and leans it out as the temperature increases.
From your description the "throttle sensor" that you have attempted to adjust also inputs to the ECU but is used as a "rate of change" rather than anything to do directly with the mixture.

Welcome to Australia.

The temperature sensor can be tested with a multimeter set to read Ohms. The resistance changes with temperature as follows:

-10°C 9100 to 9300 Ohms
0°C 5700 to 5900 Ohms
20°C 2400 to 2600 Ohms
40°C 1100 to 1300 Ohms
60°C 500 to 700 Ohms
80°C 300 to 400 Ohms
100°C 150 to 200 Ohms

You could assume that on a cold engine it will be somewhere around 15°C - 20°C so should read something close to 2400 Ohms. On a hot engine it will be between 80°C and 100°C so should read something close to 200 Ohms.

thanks for that,

are you talking about the lamda sensor? if not, would be nice if you can explain me where i can find the right one :-)


cheers Alan

Originally Posted by ozidiscoI

thanks for that,

are you talking about the lamda sensor? if not, would be nice if you can explain me where i can find the right one :-)

cheers Alan

No, no, please read it again. The Lambda sensor could also be a problem, but not all models were fitted with them, you can easily check if yours has them.

Here is a copy from another forum:

"Coolant Temperature sensor (CTS) this is a black screwed in sensor - at the front of the block, on the inlet manifold to the right (standing at the front looking in at the engine) of the thermostat housing, has a 2 pin plug timer type plug clipped on it. When this fails it will tell the ECU things are Ice cold, the ECU responds with mass of extra fuel everywhere, so it will drive like you have a choke pull on."

It should really be tested from the plug at the ECU so that the complete circuit is checked, but this is both difficult to do, and you need to identify the correct pin numbers.
First thing is to make sure the plug is connected clean and tight. Really need to remove the sensor to test it further, as you will have to place it some water and slowly heat it up while watching if the resistance changes.

Hi Alan

Welcome aboard to the forum and in to Australia.

Before you spend money on expensive parts, make sure the airways are clear and that includes the air filter.

If there is a sensor is telling the ECU that the motor is cold, then check it's wiring for damage and the surface of that sensor for cleanliness, before you change it.

Enjoy your trip.
.

Hello again.

the airfilter was the first thing i´ve checked.

I think the temperatursensor ist the problem! the multimeter was´nt able to find the resistance.....so absolutely no connection ( not wehn the car is cold and the same when its warm)! i´ll see if i can get one tomorrow and replace it! and hopefully it works :-) I think i change the fuelfilter also because i dont know how old this thing is!


what is the regular fuelkonsumption of this car? must be about 12-14 liter on 100 km ( 100kmh on the road in cruisemodi :-)), what kind of fuel is the best, is normal petrol enough for this engine? because in the manual is written it needs 98"Petrol!


Thx very much

Originally Posted by ozidiscoI

Hello again.

the airfilter was the first thing i´ve checked.

I think the temperatursensor ist the problem! the multimeter was´nt able to find the resistance.....so absolutely no connection ( not wehn the car is cold and the same when its warm)! i´ll see if i can get one tomorrow and replace it! and hopefully it works :-) I think i change the fuelfilter also because i dont know how old this thing is!


what is the regular fuelkonsumption of this car? must be about 12-14 liter on 100 km ( 100kmh on the road in cruisemodi :-)), what kind of fuel is the best, is normal petrol enough for this engine? because in the manual is written it needs 98"Petrol!


Thx very much

91/93/95 RON is fine , 98 is not worth the extra cost.

12/100 would need some really really frugal driving techniques

plan on 15/100