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Old 1 Week Ago   #1
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Car stalled at Junction - will not restart - Single Point Injection Unit

Fiat Fiat Seicento 0.9 899Cc 1994 Throttle Body Single Point Injection Unit

Hi, Got a problem with my Seicento. Driving along fine ( engine is warm and been driving for about 15 minutes) and stop at a T junction ( on a slight rise). Engine stalls. I try and start, nothing, engine turns over fine but will not fire, as if run out of petrol. I put more petrol in, still won't fire. after about 45 minutes try again, after copious amounts of trying, engine fires up, runs perfectly fine for maybe 20 - 30 seconds or so, stalls. won't restart
RAC(breakdown) man takes the Single Point Injection Unit apart, we turn over fuel pump is working fine. Try and start again with the cover off.
After maybe a minute of turning over on the battery - injector seems to backfire a couple of times , then nothing but the engine turning over - good job I've got a good battery !
I was towed to my garage who can't diagnose the problem. his only solution is to replace the entire Single Point Injection Unit assembly and see if that works - if I can find one 2nd hand that is from a scrapper, that is!

Has anyone else had this problem and has any idea what it is ? - car was fine, then cut out on a run and won't restart.

Problem getting spare parts and I may have to scrap it,if I can't resolve so any help would be appreciated. Loads of Punto Single Point Injection Unit's for sale on web -Are they the same as in a Seicento? Seicento ones seem to be as rare as hens teeth !!

Thanks
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Old 1 Week Ago   #2
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Re: Car stalled at Junction - will not restart - Single Point Injection Unit

Disappointing that they seem to have focussed on the injection unit, as these are very reliable.

More likely to be a crankshaft sensor. These do fail, and often when they get hot, working again as they cool, which would fit your symptoms.
Coil packs can also give up, but there should be no need to replace anything just to find out. Needs proper diagnostic first, but as this is pre-OBD11, it needs Fiat specific plug and software. The diagnostic plug is a 3-pin, then an adaptor is needed to connect this to the computer. There is a great diagnostic software called MultiECUscan, search for threads about this.
Plus here's their website. http://www.multiecuscan.net/SupportedVehiclesList.aspx

Advise your location, someone might be local with MES and the correct cable.
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Old 1 Week Ago   #3
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Re: Car stalled at Junction - will not restart - Single Point Injection Unit

Quote Originally Posted by portland_bill View Post
Disappointing that they seem to have focussed on the injection unit, as these are very reliable.

More likely to be a crankshaft sensor. These do fail, and often when they get hot, working again as they cool, which would fit your symptoms.
Coil packs can also give up, but there should be no need to replace anything just to find out. Needs proper diagnostic first, but as this is pre-OBD11, it needs Fiat specific plug and software. The diagnostic plug is a 3-pin, then an adaptor is needed to connect this to the computer. There is a great diagnostic software called MultiECUscan, search for threads about this.
Plus here's their website.

Advise your location, someone might be local with MES and the correct cable.
Thanks Portland - Interstingly it was a very hot day when it stalled - so hot I first thought that the petrol was evaporating somewhere in a pipe ( or similar prior to getting to the injector !

Location is Baldock Hertfordshire SG7

Thanks
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Old 1 Week Ago   #4
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Re: Car stalled at Junction - will not restart - Single Point Injection Unit

Big chance its the crank sensor. just change it for a new one they're dirt cheap.
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