Mechanics

SE 2WD POOR GAS MILEAGE- VACCUM LINE DIAGRAM

1989 Nissan Truck • 6 cylinder 2WD Automatic • 127,000 miles

I have a 1989 Nissan pick SE. VG301 motor V6 2WD with 127,000 miles on it. I recently had to change the heads due to a timing issue which froze the valves up and I lost compression. Since the new heads have been on I have got poor poor gas mileage and heavy black soot in tailpipe, so thick its eaten a hole in the pipe. As driving I feel like a backpressure or surge when gas pedal is not depressed. I was unsure of vaccum lines and where to re attach them. Any suggestions as to what is causes the poor gas mileage and can anyone provide me with a detailed diagram of the vaccum system. Mainly the lines that go to the throttle body or intake?
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Shimman
June 25, 2011.



Also, I am currently not running a thermostat. Could this play a role?


Tiny
Shimman
Jun 25, 2011.
No thermostat-engine coolant temperature sensor stays in open loop and will not go in closed loop meaning it will be running rich all the time.


Rasmataz
Jun 25, 2011.
Was the timing belt installed correctly?

This is the on; ly vacuum diagram available to me. Sorry if it is fuzzy.


KHLow2008
Jun 25, 2011.
Its readable-KHLow2008-Could be a valve timing problem as you stated-


Rasmataz
Jun 25, 2011.