I bought an 80 Vanagon camper with 78,000 miles on. After many months of
work it is on the road and off the jack stands. It has taken a longish
trip from PA to New Hampshire and back. During the trip the van could
keep up speed on the level but not much of an incline would slow it
down. I have tinkered around with it and it still seems to lack power.
The power loss seems most noticeable at low and mid RPM. When starting
from a stop if the engine RPM must be keep up or the engine will have no
power or stall (manifold leak?).
#1-115 #2-137 #3-118 #4-133
Compression test with oil
#1-132 #2-142 #3-132 #4-150
It appears that sometime in its past the rear cylinders over heated.
850 rpm, 6 degrees ATDC with OR without vacuum hose attached (is this
3000 rpm, 30-28 degrees BTC vacuum hose attached, 20-18 degrees vacuum
Engine has new fuel filter, plugs, points, rotor, cap, condenser, air
filter. The plug wires seem new.
Engine starts right up and idles smooth.
After 750 miles the plugs are white.
Fuel pressure close to limits.
There is a fair amount of air coming out of the crankcase breather port
when the PVC valve is removed.
With hose attached to the fuel pressure port I'm pretty sure I got close
to the liter per minute the manual specifies.
I am not so sure that the manifold is not leaking. Should that be more
of a problem at low speeds? Is there any easy way to test for manifold
The plastic cap on the intake air sensor was loose when i got the van. I
have "fooled" the running engine by making the engine think there was
more or less air flowing thereby changing the mixture.
With the engine at idle I have simulated increased air flow. At first
the engine speeds up a bit and then the speed rapidly decreases.
With the engine at higher RPM the same thing seems to occur. With
throttle fixed, simulating increased air flow causes the engine to at
first increase in speed and then to rapidly slow down when the mixture
gets too rich. Do you richen the mixture a little past max RPM?
Any help on what I should try, I'm feeling pretty stumped right now and
I'm pretty sure there is more power to be had.
Thank you for any thoughts.