Red oil in coolant and vehicle not starting when hot!
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Red oil in coolant and vehicle not starting when hot!
Hi There,
I'm a long time lurker of this forum and more than 10 years owner of a 1998 Porsche 996 Carrera Tiptronic car. For the last few years, I could barely use the car (apart the covid) thanks to some issues escalated because of some incompetent mechanics that I choose so in the end, I decided that it would be wise to get some advise from such a great community in here.
There's a long story of multiple times of engine rebuild and than a transmission rebuild on the car, which I don't want to bother you but in the end, I've 3 main issues which couldn't solve for a while :
1) Last time I drove the car, the rev counter was bouncing a few hundred rpms up and down while driving and we found a fault code on Transmission which says "Speed Signal <- DME Control Unit". As far as I know the speed signal is received from the crank sensor which we replaced but still wanted to know whether there is any other sensor related with car's speed where the transmission might be getting data from?
2) When the car gets into the operating temperature and you shut it down, it's nearly impossible to restart it. At first it was happening rarely but after changing the crank sensor, it started to happen all the time and we see no signal from crank sensor errors as well. After replacing the crank sensor (2 times) we replaced fuel filter, Alternator Y cable, spark plugs, Ignition Switch and now will change the Fuel Pump as well. The mechanic says they suspect from ECU as a last option which I'm not that sure although had some similar issue like this happened because of engine air blower going out like 10 years ago with similar symptoms so who knows
. May any of you have any other idea that we should check?
3) There seems to be a red colored oil cumulating in the coolant, which I suspect is the transmission oil getting into the coolant. When the transmission was rebuilt, the transmission oil cooler was replaced with a new one as well but since those guys did manage the broke the engine as well (overheated because they couldn't fill the coolant properly to the car), who knows whether they somehow broke the brand new oil cooler as well
. My question in here would be whether there is any other part that may cause transmission oil to get into coolant other than the "transmission oil cooler"? I see there is a part called "basic plate" which holds the oil cooler but didn't find any information whether it can be a cause for this.
Sorry for the inconvenience and thanks for your time!
Regards,
Özden
I'm a long time lurker of this forum and more than 10 years owner of a 1998 Porsche 996 Carrera Tiptronic car. For the last few years, I could barely use the car (apart the covid) thanks to some issues escalated because of some incompetent mechanics that I choose so in the end, I decided that it would be wise to get some advise from such a great community in here.
There's a long story of multiple times of engine rebuild and than a transmission rebuild on the car, which I don't want to bother you but in the end, I've 3 main issues which couldn't solve for a while :
1) Last time I drove the car, the rev counter was bouncing a few hundred rpms up and down while driving and we found a fault code on Transmission which says "Speed Signal <- DME Control Unit". As far as I know the speed signal is received from the crank sensor which we replaced but still wanted to know whether there is any other sensor related with car's speed where the transmission might be getting data from?
2) When the car gets into the operating temperature and you shut it down, it's nearly impossible to restart it. At first it was happening rarely but after changing the crank sensor, it started to happen all the time and we see no signal from crank sensor errors as well. After replacing the crank sensor (2 times) we replaced fuel filter, Alternator Y cable, spark plugs, Ignition Switch and now will change the Fuel Pump as well. The mechanic says they suspect from ECU as a last option which I'm not that sure although had some similar issue like this happened because of engine air blower going out like 10 years ago with similar symptoms so who knows
. May any of you have any other idea that we should check?3) There seems to be a red colored oil cumulating in the coolant, which I suspect is the transmission oil getting into the coolant. When the transmission was rebuilt, the transmission oil cooler was replaced with a new one as well but since those guys did manage the broke the engine as well (overheated because they couldn't fill the coolant properly to the car), who knows whether they somehow broke the brand new oil cooler as well
. My question in here would be whether there is any other part that may cause transmission oil to get into coolant other than the "transmission oil cooler"? I see there is a part called "basic plate" which holds the oil cooler but didn't find any information whether it can be a cause for this.Sorry for the inconvenience and thanks for your time!
Regards,
Özden
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