DME Temp Sensor

[robwright]

Does anyone know the DME temperature sensor part number for euro car parts for a 1988 turbo?? Thanks in advance guys.

 

[peanut]

I would have thought that any water temperature thermostat that fits would work fine. Its just a generic Bosch part . I bet any of the Mercedes, BMW Audi of the same period would use the same part. All it is is a simple electrical switch formed by a strip of copper which bends when hot to make or break an electrical connection. Are you referring to the Coolant Temperature Sensor in the thermostat housing ? or the Cold Start Thermo Timeswitch which controls the fuel enrichment when cold ?

 

[tref]

I don't think that is the case for the DME Temp sensor, as it is a very specific resitance at hot and cold, and in at least one failure mode, the resitance is very close, just not "right".

 

[robwright]

Are we talking about the same part mate? The DME temp sensor is a temperature variable resistor (thermistor). There are three or four temperature sensors listed on eurocarparts. Each one has a different part number though. Need to be sure which I need though.

 

[peanut]

don't know thats why I added the question to my first post. A thermoswitch is a simple temperature controlled switch which makes or breaks a circuit to the cold start injector . It works on a timer basis . The type your car uses depends on the age. Early cars increased the injector pulses when cold. later cars have a seperate injector for cold start enrichment and are controlled by a thermswitch timer

 

[robwright]

Sorry mate I didn't undrestand the context. The DME temperature sensor is not a thermostatic switch like the rad fan switch. It is a very sensitive resistor that varies with temperature known as a thermistor. As stated it's resistance will vary with temperature and feeds a signal to the DME about what the engine temperature is. This is then used in the DMEs calculations for fuel etc.

 

[peanut]

thanks rob .......i don't need a lecture about Motronic engine management systems mate. The Motronic system uses both a coolant temperature sensor and a thermo timeswitch . No such thing as a 'DME temperature sensor

 

[robwright]

Hey cool your jets mate. I thought by the way you worded the question you were asking what it was! Simple as that.

 

[peanut]

no worries but you asked for advice then chewed me out ? The part you refer to is a generic Bosch part it is the same part used on all Porsche cars Bosch are Porsche OEM suppliers You could either use the Bosch part or just use any manufacturer's part Bosch part No is I think 944-606-125-00-M14 found this on the Pelican site by Sox might be of interest.. 1. find the temp sensor, its on the engine block next to the hard pipe from the turbo. 2. With the car cold carefully pull the two spade lugs off the sensor ( the wire and connector can be very brittle). 3. Measure the resistance from each of the sensors pins (there are 2) to the engine block. 4. One side will be a dead short or near enough ( less than 2 or 3 ohms). The other side will depend on the temperature of the car. See the numbers below: 0°C = 4400 to 6800 Ohms 15 - 30°C = 1400 to 3600 ohms 80°C = 250 to 390 Omhs 100°C = 21 to 160 Ohms 5. If the numbers are not within range or its a total short/open then the sensor is barfed. 6. If the above is ok start the car and warm it up to operating temp. 7. turn it off and repeat the above measurement (don't burn your self). 8. Again if not within above range then bad sensor. If the above is ok then its not a bad sensor, but you are not out off the woods yet it could still be bad connector at sensor or at the dme or bad wires. You now have to pull the dme and do the above test. ( its pin 13 on the dme iirc). Good luck Sox

 

[robwright]

No worries mate crossed wires there I think. Yeah already tested the resistance at the DME connector and it is reading high. I have had some small problems with idling and fuel lately. Particularly running a little richer than normal. I figured if the sensor is cheap enough then it might be worth changing anyhow. Deffinitely cheaper than an AFM.

 

[bertelli_1]

Peanut - that diagram is incorrect for 944 fuel injection. The 944 does not have a thermo time switch or extra injector for cold starts. It does have 2 coolant temperature sensors, one for the ECU and one for the dash gauge. Can't help with the part number though.....

 

[rickware]

Eurocars part no. is 224110070 for the part I think you need (you'll have to call them as not listed on their site). I have 2 new ones at home bought from them a few months ago as I lost the first then found it. Never got round to fitting it yet as my problem was resolved. I think they were only about £18 from memory and I would let you have one but I don't think your near me to collect. It is the sensor at the front of the engine with a blue top just next to the first injector.

 

[peanut]

ORIGINAL: bertelli_1 Peanut - that diagram is incorrect for 944 fuel injection. The 944 does not have a thermo time switch or extra injector for cold starts. It does have 2 coolant temperature sensors, one for the ECU and one for the dash gauge. Can't help with the part number though.....

unless you are referring to a pre 85.5 car you are incorrect.! The schematic is of a 944 from Bosch . Maybe Bosch are wrong ? I see that you have a S2 yourself . Go look at the fuel rail and count the number of injectors

 

[peanut]

ORIGINAL: robwright No worries mate crossed wires there I think. Yeah already tested the resistance at the DME connector and it is reading high. I have had some small problems with idling and fuel lately. Particularly running a little richer than normal. I figured if the sensor is cheap enough then it might be worth changing anyhow. Deffinitely cheaper than an AFM.

have you checked that you do not have a leaky injector ? might be worth doing a fuel pressure leakdown test (1.5Bar at 20 mins if memory serves)

 

[robwright]

Yeah could be a few things mate but thanks for the tip. Will defo put that on the list if the simple swaps don't help.

 

[bertelli_1]

Trust me, all 944's do not have an extra cold start injector. That diagram is wrong.

 

[peanut]

ORIGINAL: bertelli_1 Trust me, all 944's do not have an extra cold start injector. That diagram is wrong.

where did I say that all 944's have a cold start injector ????? My original advice refers to the OP's car which unless it is a few months before introduction should have a CS injector You're just a bluddy troll mate.

 

[bertelli_1]

Blimey. Somebody's tired. The OP was simply after a part number & you posted a diagram that is wrong. I pointed this out. I stand by my comment, ALL 944's do not have a cold start injector, this is a fact. Sorry if this offended you?????