'91 100q 5 injectors replaced - now car wont start

[Andrew Muff]

+1 on the hydraulic lifters. I've done that myself. But it was during a head rebuild. If you let the oil leak out of the hydraulic lifters during a rebuild, you need to soak them in oil overnight to get them working properly. In my experience it's possible to get 1 or 2 of the valves to not work correctly. But unless you intentionally tried to remove the oil from them by squeezing it out, I highly doubt you would be able to get all 5 cylinders to not hold compression. 

Since you didn't go anywhere near the valves, this is not a realistic cause in this case. 

Andrew


On Jul 2, 2013, at 1:36 PM, "Steve B" <urq at pacbell.net> wrote:

> I have heard tell that there is a way for the hydraulic lifters to get pumped up in a way that the valves never close ... 
> 
> Steve Buchholz
> 
> ... and I second the comment that if a mechanic tells you they need to pull the head to figure this one out that you should shop for a new mechanic!
> 
> 
> 
> Huw Powell <audi at humanspeakers.com> wrote:
> 
>>> The mechanic told me that the engine is definitely shot but is
>>> unable to diagnose it unless he takes the head off.
>> 
>> Whoever mentioned that the "mechanic" should find a new line of work was
>> on the right track.
>> 
>>> I'm betting that the key sheared and the pulley no longer reads zero
>>> with #1 at TDC.
>> 
>> Or the pulley shifted on the harmonic damper, either way, this is so
>> easy to check.
>> 
>>> If that's the case, there is a slim chance that  the valves escaped
>>> damage
>> 
>> Not really a problem.  This is not an interference engine.
>> 
>> The only way to lose compression on all cylinders from one "event" is 
>> for the valve timing to be off (ignoring the washdown theory, which has 
>> been tested in this case).
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