Thread: Went into Low Engine Power mode

Results 1 to 14 of 14
  1. #1 Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Took a drive to check my brakes, and I lost significant engine power.

    I am seeing codes P0120, P0220, P0404, P1404, P1516 and P2101. I think I also saw an anti-lock brake system message.

    Earlier that day, I replaced front brake pad guide hardware. I mistakenly jacked up the car on splash shield which pushed on the core support. It's bent, but there doesn't seem to be anything else wrong.

    Any wiring harness I checked looked fine, vacuum lines look good...I am stumped.

    Could a bad EGR be setting this all off? I had a similar low power mode when a vacuum tee broke.

    Also, could a shorted wheel speed sensor be triggering a major electrical problem? I have had occasional anti-lock brake hiccups which had me contemplating looking at the wheel speed sensor wires.
    Reply With Quote  
     

  2. #2 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Sorry, it is a 2005 GTP
    2005 Grand Prix GTP
    Reply With Quote  
     

  3. #3 Re: Went into Low Engine Power mode 
    Donating Users bandook's Avatar
    Join Date
    Apr 2015
    Location
    Columbus, OH
    Posts
    1,781
    Thanks (Received)
    2
    Likes (Received)
    27
    Dislikes (Received)
    0
    By core support, do you mean the oil pan?
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
    Reply With Quote  
     

  4. #4 Re: Went into Low Engine Power mode 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    core support is up higher then the front sub frame, so im thinking he missed the frame and jacked it up via the core support and that can crush a radiator easy.

    not sure if theres a harness under there you might have pinched, cause thats a load of codes.

    if you clear the codes do they all come right back?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
    Reply With Quote  
     

  5. #5 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Yes, the front core support where the radiator is. There are no leaks from the radiator.

    I cleared the codes, and only P1516 came back, immediately. I did not drive it, especially since it is at reduced power mode.


    I don't believe there are any wire harnesses in the area. There is one that sits hon top of the frame, and it does not appear to be touched.

    Also, I had a well experienced Grand Prix enthusiast agree that there isn't any wiring harness below the radiator. He did say there is one above the radiator, but I am not seeing it.
    Reply With Quote  
     

  6. #6 Re: Went into Low Engine Power mode 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    the one up top is tucked inside the support, if you take the dog bone mounts off the support you'll find it.

    could be a bad wire at the plug for the tac. P1516 Chevrolet Throttle Actuator Control Module Throttle Actuator Position Performance: Code Meaning, Causes, Symptoms, & Tech Notes or its just went bad.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
    Reply With Quote  
     

  7. #7 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    After resetting DTCs, it always has Reduced Engine Power, Traction Control Off and Service Traction System on the information center. P1516 (throttle actuator control position) is always there. P0120 (TPS circuit-A output voltage compared to circuit-B) and P0220 (PCM voltage) has reappeared once.

    I took the splash shield off, and there does not appear to be any wiring. The large harness at the frame are (1) red and (1) black heavy gauge wires, untouched.
    2005 Grand Prix GTP
    Reply With Quote  
     

  8. #8 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by Scottydoggs View Post
    the one up top is tucked inside the support, if you take the dog bone mounts off the support you'll find it.
    OK, will go do.
    2005 Grand Prix GTP
    Reply With Quote  
     

  9. #9 Re: Went into Low Engine Power mode 
    Killa Bee Scottydoggs's Avatar
    Join Date
    Aug 2010
    Location
    new jersey
    Posts
    39,919
    Thanks (Received)
    63
    Likes (Received)
    166
    Dislikes (Received)
    5
    dbw can suck, the pedal or the tb might have taken a crap here.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
    Reply With Quote  
     

  10. #10 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by LouF View Post
    OK, will go do.
    There are no wiring harnesses high or low. I took out the fans and looked behind radiator and condenser coil to be absolutely sure - nothing. - cleaned lots of grit and grime from the radiator.

    This must be some strange coincidence. I moved the car twice before going on this longer test drive when the malfunction occurred, so that can make sense.
    2005 Grand Prix GTP
    Reply With Quote  
     

  11. #11 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by Scottydoggs View Post
    dbw can suck, the pedal or the tb might have taken a crap here.
    Sounds possible (read these similar items in other research), but there are so many other parts mentioned. PCM faliure?

    I checked the EGR and it is not stuck; unplugged and replugged the TB connector. Checked various wires for burn or wear since last week I got aggressive on solving an intermittent misfires - everything looks OK. Fuses in underhood fuse box look good. Battery is fully charged/assumed to be good.
    2005 Grand Prix GTP
    Reply With Quote  
     

  12. #12 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Quote Originally Posted by Scottydoggs View Post
    dbw can suck, the pedal or the tb might have taken a crap here.
    Problem solved. It was a piece of tape that I used around the crankcase ventilation tube elbow at the snorkel that came off and got sucked into the airstream. LUCKILY, it got caught at the throttle plate, OMG. It was preventing the butterfly from going to closed/idle position. Removed it, cleaned the throttle body and did a quasi-relearn process, and back to a normal running engine. That threw everything off !

    Thank you very much for your help!! - the final guess was right at where the issue was, the TPS/throttle body.
    Reply With Quote  
     

  13. #13 Re: Went into Low Engine Power mode 
    Donating Users bandook's Avatar
    Join Date
    Apr 2015
    Location
    Columbus, OH
    Posts
    1,781
    Thanks (Received)
    2
    Likes (Received)
    27
    Dislikes (Received)
    0
    Nice! Scotty is like the rain man of the 3800. He's helped me a ton.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, 29°, ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
    Reply With Quote  
     

  14. #14 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    72
    Thanks (Received)
    0
    Likes (Received)
    0
    Dislikes (Received)
    0
    Thanks. Yes, I don't think I would have followed through with the TPS; I was sold on a failed PCM. I was about frantic thinking of all the parts that could have been thrown at it.
    Reply With Quote  
     

Similar Threads

  1. Replies: 10
    Last Post: 07-20-2021, 09:07 PM
  2. 16:1 afr in power enrichment mode
    By copperpacecar in forum General Tech Discussion
    Replies: 4
    Last Post: 03-19-2012, 03:22 PM
  3. Engine Power
    By mongoclark in forum Engine
    Replies: 0
    Last Post: 01-18-2012, 12:52 PM
  4. Service Engine light flashes... engine shakes...hardly any power at all
    By bigbluegtp in forum 3.8L V6 Supercharged (L67)(L32)
    Replies: 7
    Last Post: 12-08-2010, 07:10 PM
  5. No engine power above 2-3K?
    By scottm in forum 3.8L V6 Naturally Aspirated (L36)(L26)
    Replies: 20
    Last Post: 07-01-2009, 02:58 AM
Tags for this Thread

View Tag Cloud

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •