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Starting problems when hot, 94 Jetta



 
 
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  #1  
Old October 11th 04, 03:12 PM
Mark Kyprianou
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Default Starting problems when hot, 94 Jetta

I frequently have a problem starting my 94 Jetta, Multi-port fuel
injection when the car is hot and has sat for about 5 minutes. The
engine turns over fine, but will not fire. It sounds like the car is
starved for gas.

I've recently tuned the car up: plugs, rotor, cap, but the problem
still exists.
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  #2  
Old October 11th 04, 05:47 PM
SFC
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Sounds like vapour lock. Check how rapid the fuel pressure drops after you
shut down.

SFC

"Mark Kyprianou" > schreef in bericht
m...
> I frequently have a problem starting my 94 Jetta, Multi-port fuel
> injection when the car is hot and has sat for about 5 minutes. The
> engine turns over fine, but will not fire. It sounds like the car is
> starved for gas.
>
> I've recently tuned the car up: plugs, rotor, cap, but the problem
> still exists.



  #5  
Old October 12th 04, 10:21 PM
Biz
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Default

This is almost always a vapor lock issue.


"Mark Kyprianou" > wrote in message
m...
> I frequently have a problem starting my 94 Jetta, Multi-port fuel
> injection when the car is hot and has sat for about 5 minutes. The
> engine turns over fine, but will not fire. It sounds like the car is
> starved for gas.
>
> I've recently tuned the car up: plugs, rotor, cap, but the problem
> still exists.



  #7  
Old October 13th 04, 10:54 PM
Peter Parker
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Default

In article >, SFC > wrote:
>Sounds like vapour lock. Check how rapid the fuel pressure drops after you
>shut down.


That only happens with carburators from what I can remember.

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  #8  
Old October 14th 04, 04:36 AM
dave
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>>Sounds like vapour lock. Check how rapid the fuel pressure drops after you
>>shut down.

>
>That only happens with carburators from what I can remember.
>


Kinda true, but the fuel lines are still protected against heat for the fuel
injection systems. I would assume that heat might cause problems like they had
with the carbs and vapor lock.

That fuel should recycle back into the tank heating up that fuel slightly and
possibly the lines around the engine or exhaust components may heat up the fuel
when the engine is off.
Heat is what basically causes vapor lock.
I would think it is possible that vapor lock could occur with FI systems also,
or maybe I should say that it is possible that the fuel at the injectors might
have turned into vapor while the hot engine is off.

I would still suspect an ign coil problem though! ;-)


later,
dave
Reminder........
Before you criticize someone, you should walk a mile in their shoes. That way,
when you criticize them, you are a mile away from them, and you have their
shoes. Frieda Norris

  #9  
Old October 28th 04, 08:22 PM
Mark Kyprianou
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Default

"Biz" > wrote in message >...

Any suggestions on how to solve this on a Jetta?

> This is almost always a vapor lock issue.
>
>
> "Mark Kyprianou" > wrote in message
> m...
> > I frequently have a problem starting my 94 Jetta, Multi-port fuel
> > injection when the car is hot and has sat for about 5 minutes. The
> > engine turns over fine, but will not fire. It sounds like the car is
> > starved for gas.
> >
> > I've recently tuned the car up: plugs, rotor, cap, but the problem
> > still exists.

  #10  
Old October 29th 04, 03:56 AM
dave AKA vwdoc1
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You need to check the fuel pressure. Residual fuel pressure, when the
engine is off, should remain at a certain psi for a certain period of time.
The Bentley manual should explain how to test this.

If the residual pressure test fails then the problem could be the fuel pump
check valve or the fuel pressure regulator or leaking injectors or ???

You should also check the ignition to make sure the plugs get good spark. I
have seen some new ign. coils fail, they would send spark to the plugs but
the spark was too weak to allow the plugs to fire under compression.

later,
dave

"Mark Kyprianou" > wrote in message
m...
> "Biz" > wrote in message

>...
>
> Any suggestions on how to solve this on a Jetta?
>
> > This is almost always a vapor lock issue.
> >
> >
> > "Mark Kyprianou" > wrote in message
> > m...
> > > I frequently have a problem starting my 94 Jetta, Multi-port fuel
> > > injection when the car is hot and has sat for about 5 minutes. The
> > > engine turns over fine, but will not fire. It sounds like the car is
> > > starved for gas.
> > >
> > > I've recently tuned the car up: plugs, rotor, cap, but the problem
> > > still exists.



 




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