[V8] Injector rebuild update

[Jeremy Ward]

Well at Scott Matus's advice, I got the injector o-rings at Napa (2 for
$3.12 ea) and the injector seal kits from Scott Mockry (8 x $5).  What
wasn't clear to me at first is that the injector repair kit that fits the
20vT, many Porsche cars, and many VW cars contains 3 o-rings and a spacer
that doesn't fit the V8q injector; the only part you use from the kit is the
tip which must be pushed on very tightly (one minor one major 'click').
This part needed to rebuild the injector on a V8Q injector is no longer
available by itself but is readily available in the kit.  Perhaps this was
explained in the emails, but I missed that fact.  :-)  Reuse the injector
spacer that goes on the tip first, then the Napa o-ring, then the 'hat' from
the Bosch kit.

 

You wouldn't believe what condition the injectors were in prior to
rebuilding. If you have a spare $46.24 I would highly recommend this
procedure.  It takes about an hour to do the first fuel rail and about 20min
to do the second.  I have found this 'law' to be true when doing brakes or
anything else where there is a learning curve on the first side that is gone
on the second side.  ;-)

 

I knew that I had lost the injector tip, o-ring and spacer from the #1
cylinder down inside the intake manifold, but found one other tip was
missing and all of the o-rings and injector tips were rapidly deteriorating.

 

At the recommendation of my buddy, I removed the sparkplug on the #1
cylinder and cranked it a few times hoping to shoot plastic / rubber chunks
out the hole.  Watch where you put the spark plug wire though; lots of gas
all over the engine!

 

Once everything was back together, it was difficult to start because there
was no fuel pressure initially.  It ran poorly and the oil leak onto the
headers, the break cleaner used to clean that up, and the gasoline spilled
every where was starting to smoke like crazy.  After a couple of minutes, I
shut her down to cool off.  

 

After dinner, I drove it around the block and it ran OK, but a little rough.
I think one of the pieces is stuck holding one of the intake valves open
because I hear a clicking noise on that corner of the engine.  I am told by
several people that it will melt / burn off / work its way out.  Fingers
crossed.

 

It's funny; I had some surging issues at idle that now appear to be gone.
It is running a little rough, but now has a smooth idle at 450rpm.  Like I
said $50 well spent and for you hopefully it will be preventative
maintenance instead of panic break / fix. ;-)

 

Cheers,

 

- Jeremy

 

Audi / Porsche / VW pn for 5 piece rebuild kit - 030 198 031 (8 kits
required)

Bosch pn for same kit - 1 287 010 704

Napa pn for o-rings - MPF312085 (3-21085) 8 per kit, 2 kits required

 

PT Bosch injector pn - 0 280 150 416