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Truck not starting due to fuel (I think)

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Old 09-14-2009, 09:47 PM   #1
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Truck not starting due to fuel (I think)

I just picked up this '01 Tacoma 2.4 5sp. I have been driving it for a few days with no problems whatsoever. Today I stopped at the Suzuki (motorcycle) place for about 10 mins and when I came out my truck would not start.

I figured maybe I had run it out of gas since the gauge only works sometimes. I fill it up with a spare can the owner of the shop had laying around and it still wouldn't start.

So fast forward 9hrs and I have a new fuel pump, filter, made sure I was getting gas to the fuel rail, my injectors are firing (noid light and auditory test confirms).

If I spray starter fluid into the intake, the truck will run perfect for a sec then dies. This tells me my ignition system is fine.

The fuel pump was a warranty item from a few months ago so it cost me nothing to replace and the bed is off the truck, so it literally took 5 mins to do. After the new fuel pump I can start the truck and if someone blocks all air coming into the intake with their hand, it will run but just barely. If air is left to suck into the engine, it dies. If you tap the throttle, it dies.

I am not getting any fuel through my fuel return line off the bottom of the FPR, should I be? (if I take off the FPR I can see gas in the rail) Could the FPR be the problem? I'm thinking it might be fuel pressure, but I do not have the tools to confirm that.

Here is what some people have told me: vacuum leak (massive), catalytic converter, TPS, FPR, even the MAF. I'm getting really frustrated with this now and I hate leaving it in a parking lot somewhere. I'm gonna go back and fiddle with it more tomorrow morning, but I need some ideas of what to do. I'll try searching some more on the forums, but any help is greatly appreciated.

Thanks,

Tom
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Old 09-15-2009, 06:33 AM   #2
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Are you getting any codes? (Check Engine Light)
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Old 09-15-2009, 06:34 AM   #3
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Once the truck is running (briefly) the CEL goes out. It only runs momentarily and then dies everytime.
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Old 09-15-2009, 06:41 AM   #4
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I am thinking IAC (Idle Air Control) valve. It may need cleaned.

http://www.ncttora.com/fsm/2003/Repa.../iacv/insp.pdf

It is located on the bottom of the throttle body
http://www.ncttora.com/fsm/2003/Repa.../iacv/comp.pdf
http://www.ncttora.com/fsm/2003/Repa.../iacv/remo.pdf

Most of everything you stated above should throw a code except for the FPR.
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Old 09-15-2009, 06:45 AM   #5
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But if I open the throttle shouldn't the IAC be bypassed and therefore start the truck? Thats my problem with that diagnosis. Thanks for a start though, I'll probably pull it off and clean it in a few mins when I go back to the truck.
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Old 09-15-2009, 06:47 AM   #6
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Have you done a compression test on the cylinders?
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Old 09-15-2009, 06:49 AM   #7
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I don't see how a compression test is relevant. The truck runs perfect if I spray starter fluid into the intake. It ran perfect before I parked it.
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Old 09-15-2009, 07:28 AM   #8
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You can test the FPR by hooking the FP up directly to the battery. Remove the return hose first or rig something up to catch the gas. If you are getting gas out of the return hose like you should, then pinch the return hose off, start it , and see if she takes off. The fuel rail should have 57 psi.
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Old 09-15-2009, 07:34 AM   #9
With sufficient thrust, pigs fly just fine.
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Hhmmm......Maybe the FMU? MAF needs to be cleaned?
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Old 09-15-2009, 07:36 AM   #10
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So put 12v on the fuel pump, remove the return line and see if gas comes out the FPR? I am pretty sure right now there is no gas coming from the FPR since I took the return line off and tried to start it. No fuel from there, even though there is fuel getting to the rail.
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Old 09-15-2009, 07:37 AM   #11
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Again, I don't see the relevance a MAF would have to this problem. I can clean it but I really doubt it will make a difference. These trucks have FMU's?
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Old 09-15-2009, 07:38 AM   #12
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by skarpenz View Post
Again, I don't see the relevance a MAF would have to this problem. I can clean it but I really doubt it will make a difference. These trucks have FMU's?
Sorry, FPR is what I meant, and didnt see Ben mentioned it....
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Old 09-15-2009, 07:41 AM   #13
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Quote:
Originally Posted by chris4x4 View Post
Sorry, FPR is what I meant, and didnt see Ben mentioned it....
No problem. Just trying to clarify that. FPR's usually just cause rich conditions when they fail though so I'm not understanding how a bad FPR would stop my truck from starting. This is so frustrating I have no words to describe it.

One thing though, on my interior fuse panel the fuse that is labeled ACC is blowing left and right. I put a 25 and a 30A fuse in it and it blows upon contact. WTF.
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Old 09-15-2009, 07:44 AM   #14
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Quote:
Originally Posted by skarpenz View Post
Again, I don't see the relevance a MAF would have to this problem. I can clean it but I really doubt it will make a difference. These trucks have FMU's?
I don't think so. All of the EFI and fuel management is done in the ECU, except for a few relays.

There may be a code pending in the ECU. If you have access to a scanner I would check it just for elimination purposes. Also, I am not sure if the 2RZ has a cold start valve or not. The 22RE does and it is basically the same motor (theory wise). It would be located on the intake somewhere. It would have a fuel line directly mounted to it. It is the EFI's equivalent to a Carbed motors choke. It injects shots of gas directly into the intake plenum, but that would not keep the truck from running, only starting.
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Old 09-15-2009, 07:45 AM   #15
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Quote:
Originally Posted by skarpenz View Post
No problem. Just trying to clarify that. FPR's usually just cause rich conditions when they fail though so I'm not understanding how a bad FPR would stop my truck from starting. This is so frustrating I have no words to describe it.

One thing though, on my interior fuse panel the fuse that is labeled ACC is blowing left and right. I put a 25 and a 30A fuse in it and it blows upon contact. WTF.
That's a big help. Let me check some electrical prints.
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Old 09-15-2009, 07:53 AM   #16
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Also, there is no radio in the truck and the wiring is just dangling from the dash. Please tell me this has nothing to do with my problems..
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Old 09-15-2009, 07:54 AM   #17
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Quote:
Originally Posted by skarpenz View Post
Also, there is no radio in the truck and the wiring is just dangling from the dash. Please tell me this has nothing to do with my problems..
You are safe as nothing in the IGN circuit is off of the ACC fuse. The radio/wire dangling is an unrelated issue.
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Old 09-15-2009, 07:56 AM   #18
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Well thats good I guess. Well not really, my truck still does not run, LOL..

Looks like I need to take the Jeep out and pull it to my work or something.
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Old 09-15-2009, 07:59 AM   #19
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You can find the FSM for your truck here.

http://www.ncttora.com/fsm/
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Old 09-15-2009, 07:12 PM   #20
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I pulled the codes today and did get a MAF/IAT code. Codes P0100 and P0110. I work at an auto parts store and a new MAF is on the way for me to test out real quick tomorrow. I don't see how this could cause the truck not to start though.

If I turn the key and let it turn over maybe 4 times, turn the key back, turn it forward and let crank about 4 more times and keep this sequence going then it will slowly work its way up to a low idle run, then it dies. It will build up like this then start over after a good half second of idling. I cannot figure this out. Tomorrow I'm pulling the plugs and checking for fuel in the cylinders/all over the plugs. May as well change the plugs while I'm in there.

Can starting fluid ruin a MAF sensor?
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