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Tacoma 4.0L hard to start when warm

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Fike, Jul 15, 2017.

Page 3 of 15
  1. Jul 17, 2017 at 9:22 AM
    #41
    boogie3478

    #41
    boogie3478 Well-Known Member

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    I just hope it's a relatively cheap/easy solution whatever it is.
     
    boogie3478, Jul 17, 2017
    #41
  2. Jul 17, 2017 at 9:24 AM
    #42
    Torspd

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    Torspd Tor-nication

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    Torspd, Jul 17, 2017
    #42
  3. Jul 17, 2017 at 10:32 AM
    #43
    Fike

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    Fike [OP] Well-Known Member

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    Fike, Jul 17, 2017
    #43
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  4. Jul 17, 2017 at 11:06 AM
    #44
    Fike

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    Fike [OP] Well-Known Member

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    Does anyone know how to remove the vacuum line on the fpr. It's tight back there, and I figured it just slid on, but I pulled pretty hard and it didn't budge. I didn't want to break the line, but I do want to check to make sure it is pulling a vacuum and that there isn't any oil or fuel in it.
     
    Fike, Jul 17, 2017
    #44
  5. Jul 17, 2017 at 12:07 PM
    #45
    Torspd

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    Torspd Tor-nication

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    Twist, pull.
     
    Torspd, Jul 17, 2017
    #45
  6. Jul 17, 2017 at 12:10 PM
    #46
    captn.fat.beard

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    captn.fat.beard Well-Known Member

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    sub'd. curious to see whats up
     
    captn.fat.beard, Jul 17, 2017
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  7. Jul 17, 2017 at 12:14 PM
    #47
    Fike

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    Fike [OP] Well-Known Member

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    I just pulled the vacuum hose of the regulator, and could not feel any vacuum at all. I'm going to try to rig up something to manually pull a vacuum on the regulator and see what that does. Should it have any vacuum at idle? I know it increases as you accelerate
     
    Fike, Jul 17, 2017
    #47
  8. Jul 17, 2017 at 12:28 PM
    #48
    Torspd

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    Torspd Tor-nication

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    It is setup using a different theory. Not regular vacuum.
     
    Torspd, Jul 17, 2017
    #48
  9. Jul 17, 2017 at 12:41 PM
    #49
    Fike

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    Fike [OP] Well-Known Member

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    Venturi? So is there any way to check it? I know a fuel pressure test, but that wouldn't necessarily isolate the regulator.

    Also, I've been trying to do like someone said earlier and give it some gas when I crank it. That seems to help somewhat. I'll probably end up having to change the fuel pump
     
    Last edited: Jul 17, 2017
    Fike, Jul 17, 2017
    #49
  10. Jul 18, 2017 at 11:56 AM
    #50
    Fike

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    Fike [OP] Well-Known Member

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    Day two, and giving it some gas while cranking seems to help. It still sounds funny when starting, but I haven't had an extended crank since I've tried it. I will keep reporting as I test it out.
     
    Fike, Jul 18, 2017
    #50
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  11. Jul 18, 2017 at 11:58 AM
    #51
    boogie3478

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    boogie3478 Well-Known Member

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    How many times have you given it some gas on startup?
     
    boogie3478, Jul 18, 2017
    #51
  12. Jul 18, 2017 at 12:08 PM
    #52
    Bebop

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    Bebop Old fashion cowboy

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    I'm leaning towards a bad pressure regulator
     
    Bebop, Jul 18, 2017
    #52
  13. Jul 18, 2017 at 12:11 PM
    #53
    Fike

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    Fike [OP] Well-Known Member

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    I've tried it 4 times when i feel like it would have normally messed up. It didn't startup perfect, but it was noticably quicker.

    Have you tried it?
     
    Fike, Jul 18, 2017
    #53
  14. Jul 18, 2017 at 12:19 PM
    #54
    boogie3478

    #54
    boogie3478 Well-Known Member

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    Not yet but I will. Thankfully I only really have to start my truck when it's "warm" just several times a week because most of the time I'm cold starting to go to work, truck sits all day, then I'm cold starting back home.
     
    boogie3478, Jul 18, 2017
    #54
  15. Jul 18, 2017 at 1:23 PM
    #55
    Fike

    #55
    Fike [OP] Well-Known Member

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    I got ya. Well I usually have to crank mine once or twice a day after my morning commute

    Just went and tried it again just to see, and it cranked up pretty good. Definitely thinking it's a fuel issue. I really wish they had an easier was to pressure test the system
     
    Last edited: Jul 18, 2017
    Fike, Jul 18, 2017
    #55
  16. Jul 19, 2017 at 11:03 AM
    #56
    Fike

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    Fike [OP] Well-Known Member

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    Well, now I'm not so sure it was fuel. I finally got my new PCV valve in (O'Reilly's had to order it) and put it on. My engine cranked up better than it ever has, and it idled around 700 RPM. Before changing it out it idled at 1500 and then dropped closer to 1000 when warmed up.

    Will report back the more I test it.
     
    Fike, Jul 19, 2017
    #56
    captn.fat.beard and boogie3478 like this.
  17. Jul 19, 2017 at 1:30 PM
    #57
    Torspd

    #57
    Torspd Tor-nication

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    You sure you didn't just have a vacuum leak?
     
    Torspd, Jul 19, 2017
    #57
  18. Jul 19, 2017 at 1:35 PM
    #58
    Fike

    #58
    Fike [OP] Well-Known Member

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    No, I'm not sure. I think the old pcv was open all the time. It rattles, but upon further research, the rattle is not an accurate test for newer pcvs since the spring could be bad and it would still rattle.

    I'm going to be driving again around 5, so I will see how it starts then, but it would be nice if this fixed my issue.
     
    Fike, Jul 19, 2017
    #58
    Torspd and boogie3478 like this.
  19. Jul 19, 2017 at 1:39 PM
    #59
    boogie3478

    #59
    boogie3478 Well-Known Member

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    :fingerscrossed:
     
    boogie3478, Jul 19, 2017
    #59
  20. Jul 19, 2017 at 1:45 PM
    #60
    Fike

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    Fike [OP] Well-Known Member

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    Have you ever changed yours?
     
    Fike, Jul 19, 2017
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