Re: [DML] vacuum leaks

["content22207" <brobertson@xxxxxxxxxxxx>]

Of course very few DeLoreans are powered by a "modern engine"... 

And I would argue that even on them, leaks still artifically lower
manifold vacuum over the throttle setting (unless some sort of
compensating calculation is made between the TPS and MAP sensor). 

Note that electronically controlled engines do come with a significant
cost -- whenever something goes wrong, you are walking. Period. There
is no way to rig a coil pack or pulse injectors to get you home.

But that is a moot point on this list -- the PRV is very susceptible
to vacuum leaks, which is what owners want to know about. Virtues of
2005 model vehicles (if any) won't help a DeLorean owner with
wandering idle or flat acceleration.

The bottom line is: there are many points of potential vacuum leaks on
a B28F. Owners need to know how damaging they can be, where to look
for them, how to diagnose them, and what the recommended repairs are.
Just the mere picture of John Hervey's O ring kit can be helpful in
this endeavor ("There's an O ring between the fuel distributor and the
mixture unit?"). Hopefully people won't overlook the couple of
traditional gaskets either. 

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:
> 
> Most modern engines use air density metering which incorporates a 
> Manifold Air Pressure (MAP) sensor and Manifold Air Temperature (MAT) 
> sensor. From these two readings, a figure for air entering the engine 
> can be calculated, and fuel metered accordingly. These engines do not 
> suffer mixure problems  resulting from vacuum leaks.
> 
> Martin
> 









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