Re: Shakey Stops, Strange Oil Pressure

["content22207" <brobertson@xxxx>]

Vacuum leak? Classic symptom is erratic idle. Engine will almost die,
catch itself (no more vacuum) and rev back up, then repeat. If this is
what yours is doing, don't know if Harley owners would appreciate
comparison...

You don't need any vacuum fittings at idle so is easy diagnosis to cap
them off (don't forget takeoff under upper air assembly). Could also
be cold start tube (accessible between #1 and #2 intakes), throttle
plate assembly/U pipes, or manifold itself. Use can of spray carb
cleaner with straw to pinpoint. Check idle speed motor takeoff (very
inaccessible between distributor and #4 intake) and connection to cold
start tube. Fuel distributor connection to upper air assembly is
another unlikely source.

Don't forget vacuum runs to front of car for power brakes and A/C
ductwork -- additional sources of leaks. Are powered by big takeoff on
passenger intake rail so you can isolate quickly there.

Oil pressure should stay up as soon as RPM's stop fluctuating, well
below 2500. 

Buy an assorted pack of vacuum caps (up to 3/8") and some carb cleaner
(don't mis-spray on anything painted) and let us know what you find...

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, Sean Mulligan <sean_mulligan@xxxx> wrote:
> Hey everyone,
> 
> Having a bit of trouble with my D's engine
> performance. She runs really ragged, vibrates back
> and forth when idling (sounds more like a Harley than
> usual). My oil pressure meter reads half way until I
> get the RPM's up past 2500. The oil pressure gauge
> shoots back up to the top and the car is fine then. 
> Any ideas of what this could be?
> 
> Thanks.
> 
> -Sean Mulligan
> vin #10054.
> 
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