focus st3
29-01-2019, 08:53 PM
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focus st3
Hoping someone can help currently have a focus st3 on the odd occasion while driving it has a hesitation for couple of seconds has a flat spot but if u keep your foot down it clears and pulls fine. Also when it does this the boost gauge drops and once it’s had its moment gauge comes back to normal when I first got the car it done it but recently getting more frequent. It’s almost like a misfire like it drops a cylinder. It’s had new plugs someone scanned it and came up with mass air flow sensor which was changed but still doing it. I’m hoping someone can point me in the direction of what it can be as at the moment spending money on it I haven’t got.. many thanks in advance..
29-01-2019, 09:39 PM
#2
Rs turbo
Hi mate could be a number of things. As you counted out two things. Look to see if there is a vacuum leak. Could be TPS maybe coil. Also a bit more in-depth could be that the injectors are clogging up so not giving a fine mist as it should.
29-01-2019, 09:43 PM
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it was ran on live data injectors were checked and all came back OK it put on dyno last week and was recently remaped and seems to be doing it more frequent since remap ?
29-01-2019, 09:45 PM
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Maybe possbile n75 someone elsee was saying also someone mentioned boost pressure sensor ? Very hard to determine weather it's engine side of it or turbo boost side ?
30-01-2019, 08:00 AM
#6
cossie fan (unluckerly)
I had this like a low down miss as it was building boost or held at a low boost level. If you held it flat out it would clear. I fitted new plugs and a boost solenoid and it’s fine now. Mine had no warning lights or stored errors so was a case of trying bits lol
Last edited by ajamesc; 30-01-2019 at 08:58 AM.
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