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2G P1105 - Hesitation & intermittent break up

Posted by Adrian216, Apr 24, 2020

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  1. Adrian216

    Adrian216 Probationary Member

    15
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    Joined Feb 24, 2020
    Cleveland, Ohio
    Hey guys. I picked up my 96 gsx with a few wire / ground issues and a engine code p1105. The car is mainly stock, really struggles to start when it’s cold, hesitates at low rpm and breaks up intermittently under boost, occasionally letting out a backfire but has never stalled or shut off.

    So I did some research on previous threads and read that someone has had luck with swapping the fuel pressure solenoid, so I have one on its way.. I just rerouted the vacuum lines, completely bypassing the solenoid altogether. That didn’t help anything so I’m assuming something else is causing this issue ?

    Also *** Upon swapping out my blown out shifter bushings under the hood I noticed this random solenoid that is “capped” off right underneath the intake. Could this be causing me any issues?

    Appreciate any feedback - thanks.
     

    Attached Files:

    Last edited: Apr 24, 2020

    337  18

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  2. Adrian216

    Adrian216 Probationary Member

    15
    3
    Joined Feb 24, 2020
    Cleveland, Ohio
    Update - Bypassing the fuel pressure sensor did nothing. CEL and still breaking up.
     

    337  18

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  3. 98 dsm

    98 dsm Supporting Member

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    23
    Joined Mar 8, 2009
    milaca, Minnesota
    The solenoid that it's capped off is your boost solenoid, im assuming you have a boost controller. as far as fuel solenoid check your hoses for cracks. You can also try running a vacuum straight from your intake manifold to fpr
     

    153  4

    1990 Plymouth Laser RS Turbo
    fwd · manual · 1G DSM

    Drag Race Build 187  8

    1991 Eagle Talon TSi AWD
    awd · manual · 1G DSM

    Street Build 145  3

    1990 Eagle Talon TSi
    13.805 @ 99.67 · 1G DSM
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    Adrian216 likes this.
  4. Adrian216

    Adrian216 Probationary Member

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    Joined Feb 24, 2020
    Cleveland, Ohio
    Ahhhh.. boost solenoid. Lol. Thanks for letting me know. Yes I have a MBC. As for the vacuum - that’s exactly what I did. Straight from the intake to a T - that splits to my boost gauge ( I think? ) and FPR. As for any cracks, I didn’t visibly see any but I may just get a few ft and swap them out.
     

    337  18

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  5. miguelmcv

    miguelmcv Supporting Member

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    Joined May 3, 2009
    Fresno, California
    To take the code away, just add a vacuum line from the boost controller, to te boost sensor, connect the hose to the very top nipple and cap the other nipple.

    Concerning to the other problem, Don’t just change vacuum lines, but do a boostt leak test first.

    Fix all leaks and give it a try to see what it does and report back.
     

    Street Build 527  1

    1997 Eagle Talon TSi AWD
    awd · automatic · 2G DSM

    2K  0

    1995 Mitsubishi Eclipse GST
    manual · 2G DSM
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  6. pauleyman

    pauleyman DSM Wiseman

    5,429
    1,223
    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    Why is this thread talking about the boost and fuel pressure solenoids, btw they are not sensors. The p1105 is a map sensor code.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  7. Adrian216

    Adrian216 Probationary Member

    15
    3
    Joined Feb 24, 2020
    Cleveland, Ohio

    Boost solenoid just caught my eye and I asked a question to see if they were somehow related. Fuel pressure solenoid is what all of my forum reading pointed to first when I search p1105. But ok I’ll look into the MAP sensor.
     

    337  18

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  8. delta448

    delta448 DSM Wiseman

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    Joined Jan 13, 2006
    Clarksburg, West Virginia
    Screenshot_20200425-210944_Drive.jpg
     

    2K  5

    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM

    2K  11

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  9. pauleyman

    pauleyman DSM Wiseman

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    oklahoma city, Oklahoma
    Well that explains alot. I didn't look at my book I just Googled the code. I thought all obd2 codes were the same and standardized.
     

    Street Build 3K  1

    1997 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  10. Mello

    Mello Proven Member

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    Albuquerque, New Mexico
    This too.
    upload_2020-4-26_1-11-55.png
    upload_2020-4-26_1-12-28.png
     
  11. Adrian216

    Adrian216 Probationary Member

    15
    3
    Joined Feb 24, 2020
    Cleveland, Ohio
    First - I replaced the fuel pressure solenoid. No fix. I’ll swap out the mfi relay then dig into those harnesses as a last resort because I don’t like using a multi meter

    So after installing an AFR gauge I have realized that the car runs VERY lean after restarting the engine. Lean as in 17-18+ @ idle. This is solely after the engine is shut off then restarted. The first cold start the engine will warm up and run literally almost perfect, idleing around 14 and I’ve ran the car for over 5hrs straight / 100 miles with no issues. If I start the car and stall pulling out, the car won’t run the same.

    So to me it sounds like I’m not getting enough fuel after turning on the engine while it’s warm ?
     
    Last edited: Jun 29, 2020 at 10:17 PM

    337  18

    1996 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
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  12. chrysler kid

    chrysler kid Proven Member

    1,636
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    Joined Dec 20, 2002
    Mckinney, Texas
    Had a similar problem with my gst. The fuel pump has to sit in the nozzle of the sending unit super strong. If they did not install a new fuel pump correctly it will bleed the pressure back into the tank.

    The fuel pump has a deal that goes on the end of the pump and it's extremely picky. So if the car has had the pump replaced check on that oring and take a picture of the pump in the sleeve.

    Check fuel pressure with a gauge when you start having the pressure issues
     

    2K  15

    1998 Mitsubishi Eclipse GST
    fwd · automatic · 2G DSM

    2K  12

    1996 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM

    2K  0

    1996 Mitsubishi Eclipse GST
    14.1 @ 97 · 2G DSM
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