89 4walker

Hey whats up...I have an 89 4Runner SR5...It will not take off...its also very hard to start...some say fuel pressure regulator...HELP...put new cap, rotor on did not help at all.....after warms up it only gets a little better.

YotaFun

Fuel pump seem to be workin alright?
Usually when I read people having some problems like this, it's a fuel pump issue...

89 4walker

if Im in nuetral...press the gas its real slow till about 3000 rpm...Im only getting about 87 miles to a tank....

YotaFun

When was the last time you changed the fuel filter or air filter?
I know its a noob question, but I guess I am trying to help in my own way...
87 Miles to a tank... (I just $#!^ myself...)

Th3duke

I had the same problem with my 88 4Runner, and after changing the fuel pump it resolved the problem.

89 4walker

got a cold air intake...havent replaced fuel filter yet...I thought pumps just went out...would that cauz unburnt fuel...smells rich when running....plus it idles fine

89 4walker

also can I get fuel pump out without droping tank? and what about fuel pressure regulator?

dcg9381

Do you ever light your "check engine" light.
Lots of options here.
One good way to test your fuel pump and fuel pressure regulator is to check the line pressure.. You need a special tool.

I've never heard of the fuel pressure regulator going out, but I've got a spare if you want it... (It's not likely).

With the 88 4runner, you can get to the fuel pump under the passenger side rear seat.. Dunno if that's true with the 89.

Hows your 02 sensor?

DudeBud

flip up the back seat and i think you can get to it that way. i may be wrong its been so long since i had that cover off..

89 4walker

no check engine light...i dunno about o2 sensor..how you check that..new fuel pump ish $117.00. I just figured it was the regulator because of bad gas mileage

4runnerx3

If you pull the vaccum line off the regulator it should rev higher. You mentioned it gets better when it warms up, so I would check the water temp sensor for the ecu, and the air flow meter, they both give the ecu information in ohms for air fuel ratio.

4runnerx3

Here's a pic of the regulator.

4runnerx3

this is how to check the water temp sensor for the ecu.


more on regulator.

89 4walker

when I pulled the vaccume hose of the fuel pressure regulator the truck did not rev any higher.....also I did not feel any vaccume on the hose going to the F.P.R. either....does that mean F.P.R. ish bad or a sensor maybe?

dcg9381

Is that what the factory service manual says?
Increasing the fuel pressure won't necessarily mean that the idle will go up in my experience.

89 4walker

I dont have a factory service manual...I will look for one tho. Would that make my truck hard to start? I have to hold on the starter for a minute and sometimes hit the gas......not to mention only getting 87 miles to a tank of gas...................

4runnerx3

the fuel pump runs wide open, regardless of engine speed. The pressure regulator sends the extra/un-needed fuel back to the tank. All my toyotas and my z-car will rev higher when you disconnect the vacuum line on the regulator. This is the check list for poor acceleration in the FM.
1. clutch
2. vacuum leaks-hose connections pcv, egr stays open
3. air filter
4. malfunction code-check engine light diagnostic codes
5. ignition spark- wires, distributor, coil, igniter
6. timing -5 degrees BTDC at idle (T and E1 short circuit)
7. fuel pressure- fuel pump, fuel filter, presure regulator (fuel pressure at cold start injector 33-38 psi with regulator unhooked, 27-31 psi with vacuum on regulator at idling.
8. check injectors
9. check spark plugs- plug gap 0.8mm, 0.031 in.
10. check EFI- air flow meter, water temp sensor, air temp sensor, throttle position sensor, injection signal(solenoid resistor)

If your 4runner is flooding,(black smoke) check the air temp sensor which is inside the air flow meter.