87 wagoneer need vacuum diagram

Curtis_H · May 25, 2009

I already have the FSM manual, but as many of you may know it is a complete joke, it has about 8 lines all together and you cant see where the hell they go. anyone have a better diagram than this hunk of ass matter?

chrslefty · May 25, 2009

i cant do the link beacouse im on my phone but if u searech my post i started 1 about a month ago and it has a good diagram in it .

Ecomike · May 26, 2009

The Haynes manual has good ones.

Curtis_H · May 26, 2009

thanks for your help guys, i used the link provided in the first response. replaced my intake/exhaust manifold (both had slight cracks) with complete low milage unit from a friend. re-oringed the injectors to be safe, re ran all the vaccuum lines, replaced the fuel pump, and replaced the fuel pump relay. I've honestly never driven a vehicle that runs smoother now, not even my wifes 09 optima......I love it.

mud-dog27 · May 26, 2009

where is said fuel pump relay as my jeep is running like crap and ive done filter,pump,regulator and im still only gettin 25PSI at the rail and its bouncy like the pump is surging or something and im running out of ideas and yes new plugs cap rotor and decent wires and they are all gettin spark

89xj · May 26, 2009

mud-dog27 said:
where is said fuel pump relay as my jeep is running like crap and ive done filter,pump,regulator and im still only gettin 25PSI at the rail and its bouncy like the pump is surging or something and im running out of ideas and yes new plugs cap rotor and decent wires and they are all gettin spark

what year? on my 89 its the second relay(from front of engine) in the relay center behind the battery.

if its a bad relay, it would click on and off repeatitly(sp?)

if you feel the pump is surging then you need to put a meter on it and see if the voltage is increasing/decreasing.

mud-dog27 · May 27, 2009

89xj said:
what year? on my 89 its the second relay(from front of engine) in the relay center behind the battery.

if its a bad relay, it would click on and off repeatitly(sp?)

if you feel the pump is surging then you need to put a meter on it and see if the voltage is increasing/decreasing.

yea mines an 89

ill give it a try

89xj · May 27, 2009

mud-dog27 said:
yea mines an 89

ill give it a try

you might want to also bypass the ceramic ballast resistor on the drivers side fender wall. take the 2 orange wires leading to it and connect them together.

also make sure you didnt wire the pump backwards. i know when i replace the pump on my 89 the + and - terminals of the new pump were on the opposite sides of the original pump. you may have reversed the polarity going into the pump.

mud-dog27 · May 27, 2009

yea im gunna look at the relay today and ill try the ballast as for the pump it was dummy proof red for positive black for negative but im gunna pull the pump anyway cause it was a fair bit smaller and im thinkin its underpowered

Ecomike · May 28, 2009

mud-dog27 said:
where is said fuel pump relay as my jeep is running like crap and ive done filter,pump,regulator and im still only gettin 25PSI at the rail and its bouncy like the pump is surging or something and im running out of ideas and yes new plugs cap rotor and decent wires and they are all gettin spark

Also check the fuel pressure regulator for a diaphragm leak. It is at the front of the fuel rail, and has a vacuum hose attached to it. If the diaphragm goes bad it draws excess raw fuel into the vacuum line. Fuel Pressure should be 39 PSIG (IIRC) with the vacuum line off, and 31 PSIG at idle with vacuum line attached.

mud-dog27 · May 28, 2009

Ecomike said:
Also check the fuel pressure regulator for a diaphragm leak. It is at the front of the fuel rail, and has a vacuum hose attached to it. If the diaphragm goes bad it draws excess raw fuel into the vacuum line. Fuel Pressure should be 39 PSIG (IIRC) with the vacuum line off, and 31 PSIG at idle with vacuum line attached.

i just put a new one in a few days ago and the pressure went up very little so im gunna pull the new pump that i put in cause i thin it may not be strong enough cause new pump+new regulator+fuel filter bypassed im only get 28-30 PSi

89xj · May 29, 2009

mud-dog27 said:
i just put a new one in a few days ago and the pressure went up very little so im gunna pull the new pump that i put in cause i thin it may not be strong enough cause new pump+new regulator+fuel filter bypassed im only get 28-30 PSi

the pressure should be 29 with the vacuum line connected and 39 without the vacuum line connected. how are you testing it? vacuum line connected or disconnected?

it a vacuum assited FPR, under heavy load/low vacuum, the fuel pressure increases.

mud-dog27 · May 29, 2009

89xj said:
the pressure should be 29 with the vacuum line connected and 39 without the vacuum line connected. how are you testing it? vacuum line connected or disconnected?

it a vacuum assited FPR, under heavy load/low vacuum, the fuel pressure increases.

vaccum line connected yet the problem im having with the numbers is some people say 31-39 psi range other say as high as 49 but either way it seems to be running fine again....i hate how jeeps fix them selves one day its runnin like crap next day its back to normal:confused1

joe_peters · May 29, 2009

mud-dog27 said:
vaccum line connected yet the problem im having with the numbers is some people say 31-39 psi range other say as high as 49 but either way it seems to be running fine again....i hate how jeeps fix them selves one day its runnin like crap next day its back to normal:confused1

Your 87 is 31-39, the higher pressure is on later XJs.

Ecomike · May 29, 2009

mud-dog27 said:
vaccum line connected yet the problem im having with the numbers is some people say 31-39 psi range other say as high as 49 but either way it seems to be running fine again....i hate how jeeps fix them selves one day its runnin like crap next day its back to normal:confused1

For 87-90 years it is 31-39 PSI!

wim hoppenbrouwers · May 30, 2009

Hallo. With idle the vacuum has to be 18-20 Hg. Fuel pressure on the line 31 PSI. (attached)
With WOT (Full Open Trottle) vacuum =O .pressure has to be 39 PSI.(detached). :laugh3:

87 wagoneer need vacuum diagram

Curtis_H

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chrslefty

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Ecomike

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