1987 Toyota Pickup carb or engine problems

Tiny
ZACKYB69
  • MEMBER
  • 1987 TOYOTA PICKUP
  • 4 CYL
  • 4WD
  • MANUAL
  • 285,000 MILES
As I stated I had some carb issues and I checked all the main jet ports, power piston, power valve and checked all the vacuum lines and cooresponded with the book and the dealers spec. All lines are connected. I removed the egr valve and cleaned it and checked the diaphram it held vacuum for over 12 hours. I still get excessive fuel in the primary venturi. I checked the compression in all the cyl. And I found that all are about 155 to 170psi but the 4th cyl. Only has 105 to 110. Even if I added oil to the cyl it only gained about 15 psi. I checked valve clearance it was only off 1 to 2 thous loose but didnt tap. Is the carb problem with the compression problem or is there more to it. I started messing with it because I had trouble starting it but not traveling long distance I would go 300 miles one way once a month. Just was tired of the hard starts. Dont mind donating but need really fine answers. Depending on the accel set point I can hold my hand over the carb and run better but I don't seem to have a vac leak
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Tuesday, March 31st, 2009 AT 9:58 PM

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Tiny
MHPAUTOS
  • EXPERT
Hi there, I would be checking the fuel pump pressure and having a look at the needle & seat and re checking the float hight, make sure that the power valve is sealing and re check carefully foe any vacuum leaks, check the manifold vacuum with a gauge and post the readings here. Start here.

Mark (mhpautos)
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Tuesday, March 31st, 2009 AT 11:46 PM

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