[T3] On and off hard start FI 73 type 3 ?
willjahn975 at gmail.com
Sat Jun 25 20:38:55 PDT 2022
How long do fuel injectors last? I bought 4 new ones in 2002. That's what I
have in it now.
On Fri, Jun 24, 2022 at 7:25 AM Jim Adney <jadney at vwtype3.org> wrote:
> The question you never asked was, "Why does this happen now when it
> never happened when our cars were new." The short answer is, "I don't
> know, but I can guess."
> For what it's worth, my startup experience is EXACTLY the same as yours.
> When our cars were new, there was grey vinyl sleeving over all the FI
> in the engine compartment. My GUESS is that this sleeving served as a bit
> of a heat shield, keeping those lines just a bit cooler in the heat soak
> shutdown. When those hoses were replaced over time, the vinyl sleeves
> were thrown away, because the new hose was a bit too big to fit inside the
> sleeves and the vinyl may have shrunk a bit, too. It's also worth
> remembering that even when my '68 was new, I'd sometimes turn the key
> ON and OFF a few times to make starting easier. Later FI engines tended to
> run richer and cooler, but they had the same thermostat, so I'd expect the
> heat soak to be the same.
> Back in the day, I bought a roll of the sleeving from VW, but it came in
> rather than grey. I figured that black would not be as good a heat shield
> grey, and the hose I had at the time was still too large to fit inside it,
> so I
> never tried it. I have smaller hose now, so I might try it next time I
> replumb an
> engine, but the primer switches work great, so there's little incentive to
> for a solution that still needs some use of the primer switch.
> On 23 Jun 2022 at 15:31, William Jahn wrote:
> > I have a prime switch and use it until I hear no more air then cycle the
> > key once pump the pedal once and most of the time it starts fine.
> > it will start then quit yet I try the key again and it starts right up.
> > Once it starts I can drive it and shut down and it always starts right
> > I drove it yesterday and it started fine , today it quit once then
> > started.
> > I replaced the fuel pressure regulator back in the mid 90's yet even
> > original worked fine , never had any issues starting or air in the fuel
> > lines where I needed a primer switch
> > I just turned the key and it fired right up.
> > I have checked everything and have power to the ECU from the power relay
> > and the pump relay always times out every time. The connector that feeds
> > the ECU from the power relay is clean and tight. I replaced the fuel
> > with a 2 port type and it's been fine. I also replaced the fuel filter
> > don't have many miles since both were done. Not long ago I took apart the
> > power relay and cleaned the contacts and replaced the ground wire since
> > half of the 1/4 " female crimp was missing.
> > All I can think of is that the fuel pressure regulator is bleeding down
> > overnight. The fact that once it's started then runs and starts right up
> > every time after tells me it's not a wiring issue.
> > The odd part is usually if it starts and tries to die if I feather the
> > throttle it will keep running. It's when it starts and runs for a minute
> > so then just quits that has me baffled. This has only happened a few
> > William
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> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
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