bergxu Posted December 12, 2014 Report Share Posted December 12, 2014 Gents, Can anyone advise on the values I'm looking for when testing the NTC sensor? All of a sudden, my '89 505 turbo is giving very rich (and hence difficult) starting--both hot and cold. Totally came out of the blue, so I'm putting my money on that having gone AWOL. Also, I assume it's just a Bosch part, so can anyone advise on where to obtain a replacement in the event I do need one? Quote Link to comment Share on other sites More sharing options...
Bean Posted December 12, 2014 Report Share Posted December 12, 2014 Similar vintage Volvo 240 uses them - put the part number into FCP Euro and it'll come up. Rabin Quote Link to comment Share on other sites More sharing options...
bergxu Posted December 12, 2014 Author Report Share Posted December 12, 2014 Thanks Rabin, Any idea as to test values for it? Quote Link to comment Share on other sites More sharing options...
Bean Posted December 12, 2014 Report Share Posted December 12, 2014 I should have that in my FSM - Won't be able to confirm until tonight. Engine grounds, and even connections should be verified too. Rabin Quote Link to comment Share on other sites More sharing options...
Stewart Posted December 13, 2014 Report Share Posted December 13, 2014 I can help a little. First up at 25 degrees the ECT should be around 1700 to 1800 ohms if it's L Jetronic. system I have experience with in all our Aussie Peugeot systems. The sensor is blue and has been used across the board from 505, 205,306,405. I had a similar fault as you and it wasn't the ETC but a low volts supply to the air flow meter. A broken power terminal on the plug on the air flow meter. Low volts from the meter mean mucho air intaking. Very rich condition. The system is dead simple compared to today and I suggest you get a wiring diagram and ohm meter if these fixes don't help. One other fault has been the start signal from the starter solenoid to the ecu. The pin gets 12 volt at start and gshould get earth when starter is dis engaged. Some solenoids have a fault here and can, at times, lose the earth connection inside them. A simple fix is to locate that wire at the ecu, cut it and earth it to the body. Works just fine, as long as it is earth properly. The key to this stuff is to understand priority inputs and trim inputs to the ECU. The very basis inputs are, engine coolant temp, air flow and rpm. Trims are tps, lambda , air temp. The engine will run quite well without tps IAT, or lambda. L, LE , LU, Motronic still uses that blue ETC sensor! I even recall the old Renix Renault with the equivalent to the zdj engine running that blue unit. Some parts list refer to it as an "injection switch, coolant". I am happy to help go through the wiring if Rabin has the diagram, no worries. Quote Link to comment Share on other sites More sharing options...
bergxu Posted December 13, 2014 Author Report Share Posted December 13, 2014 Excellent! Thanks for the reply. I've found the specs I need on the 505INFO site and downloaded them. I'll let you know in the event I get hung up anywhere. Quote Link to comment Share on other sites More sharing options...
my3AWDgst Posted December 13, 2014 Report Share Posted December 13, 2014 Napa have them in stock. Volvo and BMW's use the same sensor. Quote Link to comment Share on other sites More sharing options...
Bean Posted December 14, 2014 Report Share Posted December 14, 2014 Just make sure the spec is specific to the N9TEA - it should be a black housing. I took pics of the NTC test from the N9TEA FSM. Rabin Quote Link to comment Share on other sites More sharing options...
bergxu Posted December 15, 2014 Author Report Share Posted December 15, 2014 Thanks Rabin! Exactly what I'm looking for!! Quote Link to comment Share on other sites More sharing options...
bergxu Posted December 20, 2014 Author Report Share Posted December 20, 2014 Rabin et al, Just a follow up; as I suspected, the NTC sensor was the culprit. New one installed and she's starting right up without problem. Also installed my Euro headlamps today so now I can actually see well at night. Quote Link to comment Share on other sites More sharing options...
Stewart Posted January 15, 2015 Report Share Posted January 15, 2015 Beauty! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.