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Thread: Loss of power when warm?

  1. #1
    Join Date
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    Loss of power when warm?

    Hi, fairly new here. I own a 1995 P38 HSE, love the car but she has developed an intermittent problem that neither myself nor my mechanic have been able to fix. (in fairness to my mechanic, the problem didn't seem to happen while he had the car.)

    What is happening is, after a while driving (I'd say about an hour or so) the engine starts losing power, the further I push on the excelarater the more power I loose. The problem started a couple of weeks ago while I was towing an empty box trailer for about an hour, the car started loosing power to the point it would stop, so I pulled over and shut it off. It would start again with no problem, but loose power again after a few minutes of driving.

    So I had it towed to my mechanic, he had the car for a week but couldn't find a problem, no fault codes etc. I had the fuel pump replaced a few weeks ago as the old one failed, this has been tested and is working fine, I also run the car on premium fuel. I've had the car back for a week and it has been running fine, until yesterday when I took it for a longer drive, after about an hour it started loosing power again although this time if I backed off the excelarater it would come good, until the next hill or if I push the excelarater a little harder. Has anyone else had this problem, any idea's? Thank you.

  2. #2
    Join Date
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    Crank Position Sensor is probably faulty. Maybe the fuel filter, located on the chassis rail towards the rear on drivers side on pre-99 models.
    Cheers, Paul.
    My toys, projects and write-ups at PaulP38a.com

  3. #3
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    Your fuel tank venting may not be working, loosen the cap when it happens and see if you get a major air inflow. A new cap may cure it.

  4. #4
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    Crank Position Sensor. Pretty common issue. Pretty easy to fix. Just wish my hands were smaller to get to that thing.

  5. #5
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    Sounds like it could be both, but my money would be on the fuel filter.

    Try the fuel filter first, as a clogged one will suck power from your car. Also, I found that when I replaced my fuel pump, I must have stirred up 16 years of muck as I had lack-of-power issues directly after the fuel pump change. Fue filter is often overlooked and cheap and easy to replace.

    The CPS will give the same sort of issues, but the car tends to stall rather than loose power. It won't register on your system as it's an intermittent fault, however it's easy to check; when the car stalls or looses power, open the bonnet and poor water on the CPS to cool it down. If the car performs without issue, then its the CPS (until it gets warms and dies again). Another easy to fix problem.

    Let us know how you get on

  6. #6
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    Quote Originally Posted by gt0336 View Post
    ...the engine starts losing power, the further I push on the excelarater the more power I loose...

    It would start again with no problem, but loose power again after a few minutes of driving...

    towed to my mechanic, but couldn't find a problem...

    back for a week and it has been running fine, until yesterday...

    it started loosing power again although this time if I backed off the excelarater it would come good, until the next hill or if I push the excelarater a little harder.
    This could just about be de-ja-vu (how is that supposed to be spelt?) of my situation when my Crank Position (thought it was Angle) Sensor went silly. Apparently, they can become misaligned and chew themselves up?!? Mine got "cleaned up" and re-installed and has been good ever since.
    Hoo-Roo,

    Dave.

  7. #7
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    Quote Originally Posted by DT-P38 View Post
    This could just about be de-ja-vu (how is that supposed to be spelt?) of my situation when my Crank Position (thought it was Angle) Sensor went silly. Apparently, they can become misaligned and chew themselves up?!? Mine got "cleaned up" and re-installed and has been good ever since.
    The screws that hold he CPS are not torqued up. I was surprised how loose they were when I replaced mine (easy job and happy to talk you through it)

  8. #8
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    Thanks for all the advise, I am fitting a new fuel filter tomorrow. Can someone advise on the location of the crank position sensor? Can seem to find anything in Rave. The problem came back again today after a while driving in the heat (about 34 here today). Took a long drive yesterday (much cooler day) and it went fine apart from a very brief loss of power on the way home.

  9. #9
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    Look again at Rave, Page 408 under fuel system. Its there.

  10. #10
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    Cheers mate, found it. Can anyone direct me to any photos or diagrams of the crank position sensor? The diagram in rave isn't the best.

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