Found my running problem, and it SUCKS!!!!

[lord_verminaard at yahoo.com (Brendan Doyle)]

I've not done a compression test.... yet.  The engine was rebuilt about 50k ago so I *assumed* it would be ok.  That might be my problem right there- assumption.  I did a full vac leak check as soon as I picked up the car.  ;)  I'm pretty sure cam timing is good, although it has an adjustable cam gear and finding TDC on it is weird- I'm not sure which mark is supposed to be used for TDC.  It does not have the "dot" on the inner rim of the gear to match up with the valve cover.  Apparently this head has been worked a little, so it could have been decked as well, as the timing gear was set up full advance.  I set it back to middle and I did not notice a difference.  I'll do a compression test real quick when I change the plugs.  Gah.  I still have to replace the pass/driver side engine mount!  Went to the NASCAR race in Charlotte last weekend.  Great time but I would have rather been wrenching on Sciroccos.  

Brendan

----- Original Message ----
From: Dan Bubb <jdbubb@xxxxxxxxxxx>
To: Brendan Doyle <lord_verminaard@xxxxxxxxx>
Cc: scirocco-l@xxxxxxxxxxxx
Sent: Saturday, May 26, 2007 6:32:53 AM
Subject: Re: Found my running problem, and it SUCKS!!!!

Have you checked the basics such as cylinder compression, cam timing, vacuum 
leaks?

From: "Brendan Doyle" <lord_verminaard@xxxxxxxxx>
To: "Brian Haygood" <brianhaygood@xxxxxxxxx>
Cc: <scirocco-l@xxxxxxxxxxxx>
Sent: Saturday, May 26, 2007 5:40 AM
Subject: Re: Found my running problem, and it SUCKS!!!!


> An update..... I pulled the injectors from the '84- (looked like OEM, they 
> were Bosch, plus they also had the VW-AUDI emblems on them, the ones in 
> the '81 did NOT)  and swapped them into the '81, a quick test of the spray 
> patterns and they looked great.  Also took the 0-rings out of the 84 as I 
> knew they had been replaced not more than a year ago.  The '81 really 
> feels better- idles a little smoother but still rougher than I'd like.  It 
> still hesitates off-idle about 10% of the time.  Also, it still really 
> does not feel like it's running at 100% power, as I swore the basically 
> stock 1.8 8v in the 84 (with 300k) was quicker.  With a 2.0 at 10:1, 
> ported JH head, and a G-cam, this thing should fly.
>
> A summary:  I've tested everything electrical that I can possibly test. 
> The exception- ISV duty cycle.  I've also not done a pin-out test on the 
> ECU or knock box or any of that.  I've swapped the junk ignition 
> components for all the good stuff the '84 had, a new-ish 16v coil, 
> Neuspeed wires, OEM Bosch cap, and a decent set of Bosch plugs.  The plugs 
> were fouled up a little, I plan on replacing them soon.  I built a DPR 
> harness and set it to around 7.5-8.  (made no difference when it was set 
> to 10)  I swapped the fuel pump from the 84, which was only about 6 months 
> old.  New fuel filter.  I've run 3 tanks of gas through it since I 
> received it, each time with fuel system cleaner.  I plan on checking 
> lifter adjustment when I replace the valve cover with a G60 unit.
>
> Another curious oddity- when shutting the car off, it will sometimes 
> diesel- i.e. after clicking the key off, it will kick and fire a few more 
> times.  The Bentley says this is a timing issue, but I've set and re-set 
> the timing???  I have the timing set just a hair below where it starts to 
> ping- which is just a tad above stock timing.
>
> About all that's left to do is just wait until I yank this engine and drop 
> in the TDI.  :P
>
> Brendan
>
>
> ----- Original Message ----
> From: Brian Haygood <brianhaygood@xxxxxxxxx>
> Cc: scirocco-l@xxxxxxxxxxxx
> Sent: Friday, May 25, 2007 10:54:05 PM
> Subject: Re: Found my running problem, and it SUCKS!!!!
>
> Did you check your fuel pressure?  I'm not sure, but would fuel pressure
> too low cause a bad pattern?
>
> BH
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