Slow Down 1 / 4
Discussion
Ok going on a 2500 mile jaunt next week so decided to get everything done on the car. New tyres, service at a main dealer in Swindon (who were very good) and they carried out some extra work (i.e gear cable adjustment, throttle cable etc) and finanlly they recommended an engine tune and balance.
Picked the car up and will admit it felt like a new car, engine ran smoother and gear selection etc all an improvement.
Now on the way home on the motorway had to overtake someone and as I approached 80mph the "slow down 1/4" light came on. This is to do with cats and my car registered Jan 92 is exempt and the sports exhaust fitted has had them removed. The dealer had reconnected the lambda sensors so thought this could have caused the problem. Our technician (where I work) has since disconnected the sensors but this hasn't resolved the light coming on at about 70mph.
Any Ideas? The dealership isn't open until Monday but thought I would ask here.
Would ignoring the light (as I have no cats) put the car into limp mode as it does with more modern cars?
Any advice much appreciated
Picked the car up and will admit it felt like a new car, engine ran smoother and gear selection etc all an improvement.
Now on the way home on the motorway had to overtake someone and as I approached 80mph the "slow down 1/4" light came on. This is to do with cats and my car registered Jan 92 is exempt and the sports exhaust fitted has had them removed. The dealer had reconnected the lambda sensors so thought this could have caused the problem. Our technician (where I work) has since disconnected the sensors but this hasn't resolved the light coming on at about 70mph.
Any Ideas? The dealership isn't open until Monday but thought I would ask here.
Would ignoring the light (as I have no cats) put the car into limp mode as it does with more modern cars?
Any advice much appreciated
Sounds like the exhaust ECU has gone bad - even if you disconnect the sensor, which it sounds like your guy has done, it can still fire the 'cat overheat' signal and light the light. Yes, it will put the FI ECU into limp-home mode if it stays on too long.
You don't have cats, so clearly aren't worried about the cat overheating! Solution is to disable the exhaust temp ECUs completely, so they don't light the lights or send any signals - have a look at the usual on-line web suspects for detailed instructions and how-to's.
You DO want to leave your lambda sensors fitted & wired in, just to remove any confusion. If you unplug or disable those you will make the engine run like a bag of nails and ultimately damage it due to incorrect fueling.
By the way, if you are out driving, the 'Slow Down' light comes on and you are satisfied that there isn't a problem with the way the car is running or the engine management, they can usually be very quickly reset with a shut down of the ignition and engine re-start... you don't have to pull over to do that as it can be done on the move if required. Hope that helps.
You don't have cats, so clearly aren't worried about the cat overheating! Solution is to disable the exhaust temp ECUs completely, so they don't light the lights or send any signals - have a look at the usual on-line web suspects for detailed instructions and how-to's.
You DO want to leave your lambda sensors fitted & wired in, just to remove any confusion. If you unplug or disable those you will make the engine run like a bag of nails and ultimately damage it due to incorrect fueling.
By the way, if you are out driving, the 'Slow Down' light comes on and you are satisfied that there isn't a problem with the way the car is running or the engine management, they can usually be very quickly reset with a shut down of the ignition and engine re-start... you don't have to pull over to do that as it can be done on the move if required. Hope that helps.
larrylamb11 said:
Sounds like the exhaust ECU has gone bad - even if you disconnect the sensor, which it sounds like your guy has done, it can still fire the 'cat overheat' signal and light the light. Yes, it will put the FI ECU into limp-home mode if it stays on too long.
You don't have cats, so clearly aren't worried about the cat overheating! Solution is to disable the exhaust temp ECUs completely, so they don't light the lights or send any signals - have a look at the usual on-line web suspects for detailed instructions and how-to's.
You DO want to leave your lambda sensors fitted & wired in, just to remove any confusion. If you unplug or disable those you will make the engine run like a bag of nails and ultimately damage it due to incorrect fueling.
By the way, if you are out driving, the 'Slow Down' light comes on and you are satisfied that there isn't a problem with the way the car is running or the engine management, they can usually be very quickly reset with a shut down of the ignition and engine re-start... you don't have to pull over to do that as it can be done on the move if required. Hope that helps.
It was the ECU's, ferrari swindon sorted it and I have since just completed 2700 miles around europe with out a single hiccupYou don't have cats, so clearly aren't worried about the cat overheating! Solution is to disable the exhaust temp ECUs completely, so they don't light the lights or send any signals - have a look at the usual on-line web suspects for detailed instructions and how-to's.
You DO want to leave your lambda sensors fitted & wired in, just to remove any confusion. If you unplug or disable those you will make the engine run like a bag of nails and ultimately damage it due to incorrect fueling.
By the way, if you are out driving, the 'Slow Down' light comes on and you are satisfied that there isn't a problem with the way the car is running or the engine management, they can usually be very quickly reset with a shut down of the ignition and engine re-start... you don't have to pull over to do that as it can be done on the move if required. Hope that helps.
Thanks for the replyRVVUNM said:
Womaniser said:
RVVUNM said:
You don't get this with German products.
Great informative reply! 
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