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91 Jetta coupe-gutless



 
 
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  #11  
Old June 29th 05, 06:58 PM
nosmo
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My wife had a 91 Jetta with Digifant.
It served her very well for 11 years before trading to a new VW.
It was absolutely gutless from day one to when it was sold.
The engine felt like it had no more than 50 HP.
I personally checked and re checked everything I could in those 11 years.
Everything was within spec.
The head gasket went at about 150,000 kms.
I personally did the job, and very carefully checked the head when off the
car, personally re grinding the valves etc, etc.
Mechanically that car was perfect and the ignition timing etc bang on.
I always blamed the Digifant as I could never find anything else.
david



"Rob Guenther" > wrote in message
...
> Would this not affect all RPMs?
> "VW FREAK" > wrote in message
> om...
>> ck that the timing belt has not jumped time?
>>
>>
>> -Ken
>> "gutlessjetta" > wrote in message
>> oups.com...
>>> checked ALL intake pieces and vacuum lines,theyre all good,no fuel
>>> leakage anywhere,the wires distibutor cap and rotor are almost brand
>>> new,I did have to replace the coil recently (it died overnight too??)
>>> replaced it twice just to make sure after this happened lol, after
>>> driving it today i noticed it was behaving as you posted no power until
>>> the higher rpm,and once i was up to speed it seemed somewhat normal,
>>> but still not the jazz it should have,I'll try replacing those temp
>>> sensors,I'm really wonding about the knock sensor the wire looks fried,
>>> anyone have one of them go b4? Theres also the issue of the muffler it
>>> getting progressivly louder, its where the manifold meets the pipe so I
>>> assume its the gasket, maybe the other spring clip is missing I havent
>>> seen it from underneath yet, but I'm wondering if that would cause or
>>> contribute signifigantly to the gutlessness? lol when ever I find the
>>> source of this problem and fix it, the old peice is meeting DR HAMMER!!!
>>>

>>
>>

>
>



Ads
  #12  
Old June 29th 05, 07:51 PM
gutlessjetta
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will be fixing exhaust and replacing coolant temperature sensors today
will update with results,dont have the gear to check timing, the 02
sensor was never hooked up so thats not the prob, vacuum lines seem to
be gas free,we will see about the exhaust when i fix the leaky gasket

  #13  
Old June 30th 05, 12:38 AM
Bernd Felsche
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"nosmo" > writes:

>My wife had a 91 Jetta with Digifant.
>It served her very well for 11 years before trading to a new VW.
>It was absolutely gutless from day one to when it was sold.
>The engine felt like it had no more than 50 HP.


That's characteristic of the cam sprocket being on backwards. Lining
up the timing marks will under those circumstances result in valve
timing retarded by about 30 degrees. The engine's a real wimp until
you thrash it over 5500 rpm from where it pulls strongly to the
limiter.

>I personally checked and re checked everything I could in those 11 years.


My GTI was also poorly - after the head gasket blew (my fault) the
head was done (new valve guides, etc). Even my mechanic couldn't
figure it out; given that it's not necessary to take the sprocket
off the cam in order to do the reconditioning he'd sub-contracted
out. Cost *him* about 40 hours - over a period of 6 months to
diagnose.

In the end; the straight-edge across the cam lobes at TDC told the
full story. i.e. cam and sprocket were mis-aligned.

>Everything was within spec.


Everything you checked.

>The head gasket went at about 150,000 kms.
>I personally did the job, and very carefully checked the head when
>off the car, personally re grinding the valves etc, etc.
>Mechanically that car was perfect and the ignition timing etc bang on.


>I always blamed the Digifant as I could never find anything else.


So did the mechanic in my case.
--
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  #14  
Old June 30th 05, 01:28 AM
gutlessjetta
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well unless the cam sprocket can change direction by itself and
overnight then thats definately nort the problem as the car DID work
fine 2 weeks ago(lots of power)anyways I changed the temp sensor today
and did the exhaust,quieter a tiny bet better,but still
lacking,(definately no cat clog)tested the knock sensor,tapping on it
lightly made the timing change,so thats not it,o2 sesnor was never
hooked up so thats not the prob, vacuum lines seem clean and gas
free,the front motor mount has been going for some time, maybe it has
something to do with it, by yanking wires or something,so I'm still
trying to figure it out,but thanx so far, everyone is giving many more
ideas

  #15  
Old June 30th 05, 01:37 AM
gutlessjetta
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btw anyone know what kinda ohms reading i should get from the coil
though i replaced it twice niether were new,they were werking but who
knows

  #16  
Old June 30th 05, 02:31 AM
dave AKA vwdoc1
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Did you check the CO before the cat. conv.?
I have had to adjust the screw inside of a few of the airflow boxes to get
some engines to run better.
If the engine runs a little too rich, it will not have that good power you
want.
I have seen at least two bad airflow boxes.

I have seen too many wiring problems at either the grounds to the
intake/cyl. head or at the throttle switches.

BTW Most Digifant IIs that I have seen have great power!
Of course these engines have a working 02 sensor! 8^)

later,
dave
(One out of many daves)


"gutlessjetta" > wrote in message
ups.com...
> well unless the cam sprocket can change direction by itself and
> overnight then thats definately nort the problem as the car DID work
> fine 2 weeks ago(lots of power)anyways I changed the temp sensor today
> and did the exhaust,quieter a tiny bet better,but still
> lacking,(definately no cat clog)tested the knock sensor,tapping on it
> lightly made the timing change,so thats not it,o2 sesnor was never
> hooked up so thats not the prob, vacuum lines seem clean and gas
> free,the front motor mount has been going for some time, maybe it has
> something to do with it, by yanking wires or something,so I'm still
> trying to figure it out,but thanx so far, everyone is giving many more
> ideas
>



  #17  
Old June 30th 05, 03:53 AM
gutlessjetta
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one other weird item i noticed when fixing the exhaust system was a
threaded hole above the o2 sensor on the manifold, thats where all my
noise was coming from,the gasket was shot too but it was still loud
with the new gasket,plugged the hole the car is quiet as normal

  #18  
Old June 30th 05, 11:11 PM
gutlessjetta
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I'm not sure what you mean by the CO?I replaced the whole air intake
system already, if you mean the ground at the cylinder head, if you
mean the one by the valve cover, you may be right, because it is loose
one a little oily, I'll try to clean up all the grounds i can
find,cause ya never know,the gas consumption is alot worse now aswell
just remembered now to mention it, but it may be a pointer

  #19  
Old July 1st 05, 04:58 AM
dave AKA vwdoc1
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this should explain a few things about the emissions on autos. ;-)
http://autos.yahoo.com/owning/mainta...iss%01qamuffle

your engine likes to run lean

"gutlessjetta" > wrote in message
oups.com...
> I'm not sure what you mean by the CO?I replaced the whole air intake
> system already, if you mean the ground at the cylinder head, if you
> mean the one by the valve cover, you may be right, because it is loose
> one a little oily, I'll try to clean up all the grounds i can
> find,cause ya never know,the gas consumption is alot worse now aswell
> just remembered now to mention it, but it may be a pointer
>



  #20  
Old July 2nd 05, 02:06 PM
gutlessjetta
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meh no emmissions testing round here,but yeah I do think my engine is
running rich

 




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