SDF1965 Posted October 13, 2018 Report Share Posted October 13, 2018 I have a strange fault that I hope someone on here can assist with been out for the day, in all a 120 mile trip, met with friends, couple of hours later on the way home, after about 20 miles And doing about 50 the car felt like the ignition had been turned off, momentum bumped the car back into life. Fault got worse as journey progressed and when sitting in traffic would cut out completely car would start immediately from the key and idled at 850 RPM , pulls strongly with no hesitation my Ebay OBD reader can’t see any error codes so little stuck there train of though so far 1. Thought about crank sensor but car will restart immediately so should I discount? Sensors tend to need time to cool down and everything up to full operating temperature 2. Fuel pump relay or fuel pump? however when car restarts it idles smoothly and no hesitation in acceleration 3. Throttle position sensor, if that fails would that give the symptoms i’m Having? any suggestions gratefully received Link to comment Share on other sites More sharing options...
PaulQ Posted October 13, 2018 Report Share Posted October 13, 2018 Any other electrical gremlins.? Its not unheard of for a failing ignition switch to cause the car to randomly cut out. Link to comment Share on other sites More sharing options...
SDF1965 Posted October 13, 2018 Author Report Share Posted October 13, 2018 No other electrical gremlins, when the cutout occurs no lights up on dash, radio stays on along with fan etc, not sure if the ignition key failing would turn off all the power? Link to comment Share on other sites More sharing options...
S8ked Posted October 14, 2018 Report Share Posted October 14, 2018 I had a similar issue with my 964. No codes no warning lights the car just would slow down and stop. The issue was fuel starvation. Turned out to be a VERY dirty fuel filter that was restricting fuel flow. Easy fix but it took a lot of time to find the real problem. We have a issue here in the USA with ethanol in our gas, it causes lots of problems. Link to comment Share on other sites More sharing options...
SDF1965 Posted October 14, 2018 Author Report Share Posted October 14, 2018 Thanks for the reply, i did wonder if fuel was the issue, weather here is miserable today, no garage so any work is done on the drive, will investigate this further when I get an opportunity Link to comment Share on other sites More sharing options...
Venari Posted October 14, 2018 Report Share Posted October 14, 2018 The VAG-shared ignition switch is a common failing. Example DIY guide: http://www.pedrosgarage.com/Site_3/Replace_Ignition_Switch.html Link to comment Share on other sites More sharing options...
Luciano casali Posted November 18, 2018 Report Share Posted November 18, 2018 Crank sensor , had same problem with BMW X3 would cut out and re start with ignition off/ on it seemed to reset no readings to indicate anything spoke to local car sparkie and he said replace it which was a real balls ache but guess what sorted Link to comment Share on other sites More sharing options...
Lennym1984 Posted November 19, 2018 Report Share Posted November 19, 2018 Did the car get wet at all. I had something similar when I soaked my cracked coil packs Link to comment Share on other sites More sharing options...
Richard Hamilton Posted November 19, 2018 Report Share Posted November 19, 2018 On 10/14/2018 at 1:41 PM, Venari said: The VAG-shared ignition switch is a common failing. Example DIY guide: http://www.pedrosgarage.com/Site_3/Replace_Ignition_Switch.html Bear in mind all the US articles on this are for LHD cars, where the ignition barrel is the other way up, which makes it difficult to access from the footwell. BTW, you should really post something here: http://www.BoXa.net/forum/forum/17-other-marques-besides-porkers33/ I'd love to see some photos of your other cars, especially the Fulvia. I had a 1970 Rallye S many years ago. Sorry for going O/T OP. My money would be on the fuel pump relay or CPS. You wouldn't get a fault code for the pump relay, and a generic code reader might not show a CPS fault. Link to comment Share on other sites More sharing options...
James1980 Posted November 22, 2018 Report Share Posted November 22, 2018 OP, did you trace the fault? I once had a similar issue which turned out to be a faulty MAF. Car would cut out mostly when idle, but sometimes at speed! Link to comment Share on other sites More sharing options...
Venari Posted November 25, 2018 Report Share Posted November 25, 2018 On 11/19/2018 at 11:23 AM, Richard Hamilton said: I'd love to see some photos of your other cars, especially the Fulvia. I had a 1970 Rallye S many years ago. Many years ago. It's been laid up quite a while now, waiting for me to get a big workshop. Link to comment Share on other sites More sharing options...
SDF1965 Posted December 2, 2018 Author Report Share Posted December 2, 2018 Hi all, quick update, following all advice received I discounted sensors as the car would restart immediately after cutting out. Rather than dive in and start replacing items I pulled all fuses and relays, including those in the boot, cleaned contacts and reinstalled. Have completed approximately 800 miles in all weathers, faultless suspect it may have been fuel pump relay, should it happen again will start with that relay lovely Fulvia by the way, had a bought a 1300 back in 84, couldn’t get insurance so swapped for a TR7..... that’s another story!! Link to comment Share on other sites More sharing options...
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