When my 03 Jetta became hard to start, it turned out to be the engine speed sensor. ?Fairly easy to replace on the 24v vr6
I would also be suspicious of the cam position sensor. The ecu uses it to fire plugs?
This is the case where the VcDs software pays off?
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On Jul 4, 2021, at 11:08 AM, Big C via groups.io <k_kodiak1@...> wrote:
?Morning, John,
There's a myriad of reasons what causes a hard start after an engine is warmed up. I suggest you document the issue well (length of drive, where you go (elevation), time of day, ambient temp, who touched your vehicle last and what if anything was replaced or "fixed" on your van etc), save your money, then call around to find a real automotive diagnostician who knows how to use a scope (Pico) and a scan tool (Snap-On, Autel, eScan etc), and then review your documentation with that tech -- because that's the only way you're going to get your hard starting issued resolved properly. Of course, a diag tech with VW experience would be preferable...but not absolutely necessary.
Regarding your "tried giving it no gas while cranking and lots of gas, but that doesn't seem to make any difference": That's because your van has a fuel injection system. Those systems don't prime the fuel system with the gas pedal. :-)
P.S. Your local VW "repair" shop may be good at changing and wrenching parts...but playing parts darts by changing an air filter for a complaint of a hard start when the engine is already hot -- with no other drivability issues? Absurd.
