Hey guys - another query for the 3.slow gurus.

93 4Runner SR5 3.0

When the engine is cold (like sitting over-night) she fires right up with no problems.

However - after the engine has run for a while. Such as driving the five miles to town - if I shut her down it's takes about 2-3 seconds of cranking before she'll fire back up. Even then the start is like the engine is starved for fuel. After a couple of seconds - back to normal ops.

After reading through the Service Manual I think I've narrowed it down to the Fuel Pressure Regulator. Sounds like the fuel pressure regulator is not allowing enough gas to get to the injectors after sitting.

Before I spend the money for a fuel pressure guage I was just curious if anyone else has had this sympton before? If so - how'd you fix it?

Also - I have replaced the fuel filter so that's not it.

interesting issue... just curious, what makes you think it's the regulator?

edit: read your post again, missed the part about not letting enough fuel etc etc...

still interested, did some research. here's what i read. it might help you,i hope.

Typically located on or near your firewall and attached to your metal fuel line tubing, the fuel pressure regulator houses a spring operated valve that will open if it feels the excessive vacuum forces of too much fuel in the lines. It then allows the extra fuel to run into a reservoir where it will be safe and reduce the pressure in the lines. The fuel pressure regulator is responsible for keeping your fuel lines at a constant pressure rating while also preventing the use of too much fuel during acceleration, deceleration, and other emission heavy operations.

Because of its simple design and dependence on vacuum forces, the fuel pressure regulator does not frequently have problems. If a problem does occur within the regulator, it will involve the spring valve and may mean that it can't close because of a clog, a worn spring, or maybe a leak due to corrosion. Other closely related fuel pressure gauge problems would be a clog or leak in the lines attached that impeded the flow of fuel or vacuum pressure through the lines.

You will know there is a problem with your fuel pressure regulator from several noticeable symptoms. There will most likely be hesitation during acceleration, excessive load up during deceleration which may cause backfiring or emission odor, and you may even experience a choking sensation like the fuel or air is being completely cut off from the motor at times. Some vehicles may give you a warning light or trouble code to identify the problem.

Read more: http://www.redlinemotive.com/replace...#ixzz2MLJ6Xbtl

Yes, especially now with the ethanol content in gasoline. The rubber diaphragms don't stand up. I replaced our regulator(Denso) along with the fuel pump which has made quite a difference in starting/performance.
regards

tes iv had the same prob with fuel press the only diff between mine and yours my 1993 4runner was clicking bad in morrning or cold start would goaway after a min but replaced regulator and no more problums no more clicing
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Hey there, just joined the forum, first time posting so i hope this turns out right.

So i have a 94 22re Pickup Intermittent long crank start, just like Riff Raff, but for me cold or warm, doesnt make a difference. once it finally turnsover, when the engine is cold its about 50/50 if it wants to fire right up to idle smoothly or it struggles to get up to speed sounding weak or starved. when the engine is warm if its only shut down for a few minutes itll fire first or second crank.

other symptoms i have are a slight loss in power and mpg. and at times under a heavy load on the highway my check engine kicks on throwing trouble code 71.

so my questions are: did replacing the fuel pressure regulator fix your long cranking problem? did you throw any codes?

hoping you or anyone sees this and can help me out..

thanks!!

Here a vid I did a while ago on operation and testing. Don't need the vacuum gauge but it helps. FSM section on this would help you out also

https://youtu.be/qJB0918vXQc

Hmm not quiet my symptoms

Did this issue get solved ?

FPR ?

FPR= Fuel Pressure Regulator

Hey all. Recently purchased a 92 4Runner (3.0 with the Auto Trans) . And overall, I love it. However, with any 30 year old vehicle, there are some issues. Would anyone be able to help me out with the following?

- There seems to be one (Or multiple) Vacuum leaks, Idling can a bit rough, and I can tell the engine is struggling to maintain power. When the A/C gets turned on, Idling gets worse and has stalled a few times. Last owner replaced most hoses, and there aren't any obvious cracks. Any tips on finding the leak? Once it's on the road, it seems fine until I get to a stoplight.

- I also have Transmission concerns. Approx. halfway between 1000 and 2000 RPMs, things get "Jumpy". It seems to function better with Overdrive Off, but that may be placebo. No other obvious issues in other gears, and the trans fluid looks and smells fine.

- Lastly, after coming home from a drive, I hear an intermittent "Pop" come from below The under carriage. Air filter is decently clean, not sure about anything other than that.

My only thoughts are potentially the Fuel Regulator, or the EGR. No check engine light, and it passed AZ emissions when I bought it. So i'm trumped. Do I just have to deal with the headache of finding the bad hose? Any tips on doing that?