95 4Runner 22RE Hot start problem
03-10-2020, 07:12 PM
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95 4Runner 22RE Hot start problem
I have been chasing a hot start problem for months that I cannot figure out. I bought this 4Runner last summer from a guy in Arizona. It had a rebuilt 22re motor in it, was missing all of the smog components. Since I owned it I have done the following: New EGR valve, new catalytic converter, new exhaust from cat back, replaced AFM meter with a known good one, cleaned IAC valve, replaced PCV valve, new ECU temp sender, new NGK spark plugs, new cap rotor and wires, adjusted TPS, replace vacuum lines with silicone lines from LCE. Made sure vacuum lines were run correctly per vacuum diagram inside of hood on factory sticker.
Somewhere in the middle of changing the above items the hot start problem started. What happens is I go drive it and after the engine warms up I shut it off. Let it sit for 15-20 minutes. Try to start it and it barely turns over and dies. I do this 2-3 times then it eventually starts but is idling so low it barely runs until I rev the gas then it tends to level out. When I drive it around it runs great with no problems. When it is cold it start perfectly fine.
Recently I got a fuel pressure gauge and hooked it up through the banjo bolt on the cold start injector. Below are the readings:
Fuel pressure at cold start = 36psi
Fuel pressure at warm operating temperture = 36psi
While running unplugged vacuum line to FPR and pressure went up to = 42psi
Shut engine off and pressure went to = 39psi
After engine shut off to see if it held pressure
at 5 minutes it was still at 39psi
At 10 minutes it was still at 39psi
at 20 minutes it was still at 39psi
The next morning 15 hours later it went to 0 psi
I was first concerned before I ran this test that maybe I had a fuel injector leaking. Since it holds pressure that debunks this theory.
Also when it runs if I pull the vacuum line to the FPR the idle slightly increases, which is normal
Really stumped on this one and tired of messing with it. Does anyone have any ideas? Any help would be appreciated!!
Regards,
Mike
Somewhere in the middle of changing the above items the hot start problem started. What happens is I go drive it and after the engine warms up I shut it off. Let it sit for 15-20 minutes. Try to start it and it barely turns over and dies. I do this 2-3 times then it eventually starts but is idling so low it barely runs until I rev the gas then it tends to level out. When I drive it around it runs great with no problems. When it is cold it start perfectly fine.
Recently I got a fuel pressure gauge and hooked it up through the banjo bolt on the cold start injector. Below are the readings:
Fuel pressure at cold start = 36psi
Fuel pressure at warm operating temperture = 36psi
While running unplugged vacuum line to FPR and pressure went up to = 42psi
Shut engine off and pressure went to = 39psi
After engine shut off to see if it held pressure
at 5 minutes it was still at 39psi
At 10 minutes it was still at 39psi
at 20 minutes it was still at 39psi
The next morning 15 hours later it went to 0 psi
I was first concerned before I ran this test that maybe I had a fuel injector leaking. Since it holds pressure that debunks this theory.
Also when it runs if I pull the vacuum line to the FPR the idle slightly increases, which is normal
Really stumped on this one and tired of messing with it. Does anyone have any ideas? Any help would be appreciated!!
Regards,
Mike
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