2016 vw Jetta 2.0 no start intermittent
So I have a vw 2.0 that Stalls or no starts after several trips about once a month . Originally it had a check engine light for rich off idle and no start . It had never acted up as far as no start or stall . Found fuel pressure was 25 psi too high causing rich off idle code which has not returned in many months ( I replaced fuel filter / regulator because it had the turbo motor filter on it and this is non turbo ) and hundreds of miles but still has a no start randomly that I only witmessed recently in a parking lot but by the time I pulled codes ( none ) and proceeded to pull plug wire to check spark it fired up . I had replaced crank sensor on last visit with oem part because I could tap on it with extension and would stall . I do recall tapping on sensor after replacing And it did not stall with new crank sensor . Now I can tap on and new sensor is causing a stall . The sensor has a jumper harness soldered to it from factory so don’t believe at all it’s connector 6 inches away from sensor . Maybe vw sensors are that sensitive ? Also this car has a poor idle in park only and fuel trims look great in park or in gear so maybe a balance issue with poor idle ?? This is a timing belt engine with a single coil and wires with only a MAP sensor . Thanks for advise
This will sound dumb…. But I've seen it many times on this vintage style 2.0 engine. The spark plug wires are faulty. If you do an ohms test it will pass. If you do a spark output test it will pass. The wires are arcing at the metal protective sleeves and shorting to ground. I have diagnosed many from other shops that have spent countless hours on the same issue. You can monitor your misfire…
how is a single wire causing a no start? Why can I tap on crank sensor and cause a stall ? Thank you for help . I believe you I just need to know . I sprayed with water and no misfires on scan tool . This is definitely a hot soak issue
Normally its multiple wires arcing, not a single wire. They unbelievably fail pretty much at the same time. The other shops also could not believe it.
This is a 2016 Jetta with a 2.0 non-turbo engine with one coil and four spark plug wires?
A CPPA “non-turbo”? I'd have to see it. That's not what a CPPA is. In fact, every engine on that series of Jettas is turbocharged, even the hybrid. Plus CPPAs have four COPs, not a single coil or coil pack. So it's not a 2016, which I asked in my original question, hopefully nudging you to correct your vehicle information, most likely getting you better replies.
Can you scope the coil pack and watch it pulse in time with the injectors?