tough to start 91 turbo diesel jetta

it will start but only after tuning off for about 5 minutes. it will
start to chug and then starts. then it will start right away
everytime. leave it over night and its back to running the starter for
over 4-5 minutes until it catches.
what up with this

> it will start but only after tuning off for about 5 minutes. it will
> start to chug and then starts. then it will start right away
> everytime. leave it over night and its back to running the starter for
> over 4-5 minutes until it catches.
> what up with this

Need new glow plugs or else the glow plug fuse is blown.

Lynn

My theories...........
Possibly the little electric shut off valve in the Injection Pump is not
fully sealing so when the engine is off air gets into the fuel lines. Then
the pump has to push out the air and suck up the fuel from the tank.
Look for bubbles in the lines after you shut off the engine or when you
first get it started.

Or it could just be the glow plugs or its fuse or the temperature sensor or
the relay. :-)

Gotta test things with a 12 volt probe or meter!
--
later,
dave
(One out of many daves)

> wrote in message
ups.com...
> it will start but only after tuning off for about 5 minutes. it will
> start to chug and then starts. then it will start right away
> everytime. leave it over night and its back to running the starter for
> over 4-5 minutes until it catches.
> what up with this
>

test the glow plugs first.

> wrote in message
ups.com...
> it will start but only after tuning off for about 5 minutes. it will
> start to chug and then starts. then it will start right away
> everytime. leave it over night and its back to running the starter for
> over 4-5 minutes until it catches.
> what up with this
>

On Nov 8, 5:17 pm, wrote:
> it will start but only after tuning off for about 5 minutes. it will
> start to chug and then starts. then it will start right away
> everytime. leave it over night and its back to running the starter for
> over 4-5 minutes until it catches.
> what up with this

If you have a lot of miles on the engine, you may have a worn seal on
the injection pump shaft. It keeps air out of the pump. The seal can
be replaced but it is labor intensive since you have to pull the
pump. Straight forward after that. If you have over 150,000 miles on
it, consider also changing the water pump, new timing belt, and the
oil seals on the belt end of the engine block since they are due and
you have it apart. You will be good for another 150K miles then!

Regarding glow plugs, the most common failure is a cracked 50Amp glow
plug fuse. They crack right through the 'A' stamped in the fuse! You
can't see it until you remove the fuse and it falls out in 2 pieces.
I fixed mine with a section of lamp cord stripped and terminals
crimped at each end. Just long enough to connect to the fuse block
terminals and after the first terminal was crimped on, pull the
insulation off and then crimp on the second. 12 ga. cord. Blows a
little slower than stock but good enough for a 16 year old car.

81 Rabbit Diesel LS 300,000 miles - sold
86 Jetta TD 265,000 miles - Used body parts on 88 Jetta Carat, kept
diesel drive train for another, future, project.
89 Westfalia 2.3L Vortex Motor 140,000 miles on body
91 Jetta ECOdiesel 135,000 miles
93 Corrado SLC VR6 105,000 miles
05.5 MkV Jetta TDI with DSG

"Corrado Daddy" > wrote in message
oups.com...
> On Nov 8, 5:17 pm, wrote:
>> it will start but only after tuning off for about 5 minutes. it will
>> start to chug and then starts. then it will start right away
>> everytime. leave it over night and its back to running the starter for
>> over 4-5 minutes until it catches.
>> what up with this
>
> If you have a lot of miles on the engine, you may have a worn seal on
> the injection pump shaft. It keeps air out of the pump. The seal can
> be replaced but it is labor intensive since you have to pull the
> pump. Straight forward after that. If you have over 150,000 miles on
> it, consider also changing the water pump, new timing belt, and the
> oil seals on the belt end of the engine block since they are due and
> you have it apart. You will be good for another 150K miles then!
>
> Regarding glow plugs, the most common failure is a cracked 50Amp glow
> plug fuse. They crack right through the 'A' stamped in the fuse! You
> can't see it until you remove the fuse and it falls out in 2 pieces.
> I fixed mine with a section of lamp cord stripped and terminals
> crimped at each end. Just long enough to connect to the fuse block
> terminals and after the first terminal was crimped on, pull the
> insulation off and then crimp on the second. 12 ga. cord. Blows a
> little slower than stock but good enough for a 16 year old car.
>
> 81 Rabbit Diesel LS 300,000 miles - sold
> 86 Jetta TD 265,000 miles - Used body parts on 88 Jetta Carat, kept
> diesel drive train for another, future, project.
> 89 Westfalia 2.3L Vortex Motor 140,000 miles on body
> 91 Jetta ECOdiesel 135,000 miles
> 93 Corrado SLC VR6 105,000 miles
> 05.5 MkV Jetta TDI with DSG
>> Yea it sounds like glow plugs. Or the big fuse. It acts like they are
>> completely dead. Cold soak it overnight and you need them glow plugs.

Doctor Dave,

I am not seeing any bubbles in the fuel lines and the glow plug fuse is
intact. I would like to check the other components you suggeested. Where is
the temp sensor and relay located? Are there any test that I can conduct to
check these components?

Thanks in advance,

Bryan

dave AKA vwdoc1 wrote:
>My theories...........
>Possibly the little electric shut off valve in the Injection Pump is not
>fully sealing so when the engine is off air gets into the fuel lines. Then
>the pump has to push out the air and suck up the fuel from the tank.
>Look for bubbles in the lines after you shut off the engine or when you
>first get it started.
>
>Or it could just be the glow plugs or its fuse or the temperature sensor or
>the relay. :-)
>
>Gotta test things with a 12 volt probe or meter!
>> it will start but only after tuning off for about 5 minutes. it will
>> start to chug and then starts. then it will start right away
>> everytime. leave it over night and its back to running the starter for
>> over 4-5 minutes until it catches.
>> what up with this

Well I would think that if the temperature sensor was defective the Glow
Plug Light would not light for over 10 seconds with a cold engine.

If you don't see any bubbles in the fuel lines then I think it is
electrical.
Check for power at the glow plugs when you first turn the ign switch on and
the GP Light comes on.
This will check the sensor, the glow plug fuse and relay.
If power then I would suspect the glow plugs are faulty.
If no power then suspect that fuse and you can bypass it temporarily or just
test the two sides of the fuse with the glow plug light on. You should get
12 volts + on both sides of the fuse with the glow plug light on. Sometimes
the fuse looks intact until you remove one of its securing screws and then
it falls apart. :-)


There are some tests you can do to see if ALL of the glow plugs are working
since if you measure the ohms each one makes up about 1/4 of the total.
I think you can remove the power lead going to the glow plugs at the fuse.
Test it with your Ohm meter
I just usually remove the power rail (if that is what it is called) from the
#4 and maybe #3 glow plug and test them individually and test #1 and #2
while they are still connected to that rail.

JMHO
--
later,
dave
(One out of many daves)

"BryanZ" <u39102@uwe> wrote in message news:7b43ddf790fd4@uwe...
> Doctor Dave,
>
> I am not seeing any bubbles in the fuel lines and the glow plug fuse is
> intact. I would like to check the other components you suggeested. Where
> is
> the temp sensor and relay located? Are there any test that I can conduct
> to
> check these components?
>
> Thanks in advance,
>
> Bryan
>
> dave AKA vwdoc1 wrote:
>>My theories...........
>>Possibly the little electric shut off valve in the Injection Pump is not
>>fully sealing so when the engine is off air gets into the fuel lines.
>>Then
>>the pump has to push out the air and suck up the fuel from the tank.
>>Look for bubbles in the lines after you shut off the engine or when you
>>first get it started.
>>
>>Or it could just be the glow plugs or its fuse or the temperature sensor
>>or
>>the relay. :-)
>>
>>Gotta test things with a 12 volt probe or meter!
>>> it will start but only after tuning off for about 5 minutes. it will
>>> start to chug and then starts. then it will start right away
>>> everytime. leave it over night and its back to running the starter for
>>> over 4-5 minutes until it catches.
>>> what up with this
>

On Nov 10, 7:25 am, Corrado Daddy > wrote:
> On Nov 8, 5:17 pm, wrote:
>
> > it will start but only after tuning off for about 5 minutes. it will
> > start to chug and then starts. then it will start right away
> > everytime. leave it over night and its back to running the starter for
> > over 4-5 minutes until it catches.
> > what up with this
>
> If you have a lot of miles on the engine, you may have a worn seal on
> the injection pump shaft. It keeps air out of the pump. The seal can
> be replaced but it is labor intensive since you have to pull the
> pump. Straight forward after that. If you have over 150,000 miles on
> it, consider also changing the water pump, new timing belt, and the
> oil seals on the belt end of the engine block since they are due and
> you have it apart. You will be good for another 150K miles then!
>
> Regarding glow plugs, the most common failure is a cracked 50Amp glow
> plug fuse. They crack right through the 'A' stamped in the fuse! You
> can't see it until you remove the fuse and it falls out in 2 pieces.
> I fixed mine with a section of lamp cord stripped and terminals
> crimped at each end. Just long enough to connect to the fuse block
> terminals and after the first terminal was crimped on, pull the
> insulation off and then crimp on the second. 12 ga. cord. Blows a
> little slower than stock but good enough for a 16 year old car.
>
> 81 RabbitDieselLS 300,000 miles - sold
> 86 Jetta TD 265,000 miles - Used body parts on 88 Jetta Carat, keptdieseldrive train for another, future, project.
> 89 Westfalia 2.3L Vortex Motor 140,000 miles on body91Jetta ECOdiesel 135,000 miles
> 93 Corrado SLC VR6 105,000 miles
> 05.5 MkV Jetta TDI with DSG

hi, thank you all for you input. it turns out that cylinder number
three is down to 200lbs on a compression test. tech said that the
starter can not turn it over fast enough to start it. its either a
burnt valve or the rings. its parked, too expensive to fix.
thanks again