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    Author Topic: Engine loses power around 5000RPM  (Read 19667 times)

    Offline dodge freak 2

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    Re: Engine loses power around 5000RPM
    « Reply #105 on: February 10, 2008 - 01:54:31 AM »
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    Offline dodge freak 2

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    Re: Engine loses power around 5000RPM
    « Reply #106 on: February 10, 2008 - 01:57:16 AM »
    « Last Edit: February 10, 2008 - 01:58:50 AM by dodge freak 2 »
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    Offline Bullitt-

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    Re: Engine loses power around 5000RPM
    « Reply #107 on: February 10, 2008 - 01:59:50 AM »
    Are you using the vacuum advance?...if so disconnect it & see what the results are.
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    Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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    Offline HP2

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    Re: Engine loses power around 5000RPM
    « Reply #108 on: February 10, 2008 - 06:52:28 AM »
    A thought from out of left field, but, have you ever replaced the filter sock on the pick up tube in the gas tank? I don't know how that would affect the erratic tach reading, but I could see it restricting fuel flow at high rpm if it is some what clogged.

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    Offline dodge freak 2

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    Re: Engine loses power around 5000RPM
    « Reply #109 on: February 10, 2008 - 09:11:34 AM »
    But even @ no load, reeving the motor in neutral?

    This is why the ignition system needs to be "scope" out, so the problem can start to be narrowed down.

    You are not asking them to fix the problem, just start to find out what areas are good so you can look elsewhere.

    If you don't have the right equipment to check it out, theres not a thing wrong with finding a shop to give you a hand.

    Either that or just change every darn part until-bingo-you get it  :lol:

    Thats the wrong way to repair your car, anybody can do that.
    « Last Edit: February 10, 2008 - 09:15:59 AM by dodge freak 2 »
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    Offline ChallengerHK

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    Re: Engine loses power around 5000RPM
    « Reply #110 on: February 10, 2008 - 09:52:37 AM »
    Quote from: HP2 on February 10, 2008 - 06:52:28 AM
    A thought from out of left field, but, have you ever replaced the filter sock on the pick up tube in the gas tank? I don't know how that would affect the erratic tach reading, but I could see it restricting fuel flow at high rpm if it is some what clogged.

     :iagree: I didn't think about the filter sock, but many years ago I had a fuel filter that had been on since the car was built (I think) probably for close to ten years. It was almost completely clogged. Fuel could flow at idle and cruise, but when I'd nail it I'd get power for a couple of seconds, then it would fall off sharply from starvation until the fuel pump could catch up through the restriction, then I'd get power again. I found out by accident what was causing the problem when I got a fuel filter clearanced for a buck at the local Dodge dealer and once I put it on the problem went away.
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    Offline MEK-Dangerfield

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    Re: Engine loses power around 5000RPM
    « Reply #111 on: February 10, 2008 - 02:12:55 PM »
    I stand by my original statement on page 1 of this thread. If the tach is going nuts, it's electrical.   :2cents:

    That narrows it to a half-million things.  :pullinghair:


      Mike
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    Mike

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    Offline Jacksboys

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    Re: Engine loses power around 5000RPM
    « Reply #112 on: February 10, 2008 - 04:31:56 PM »
    Quote from: dodge freak 2 on February 10, 2008 - 01:57:16 AM
    Here it is...good luck..its called a OSCILLOSCOPE , E-bay has like 16 right now

    http://cgi.ebay.com/ebaymotors/MAC-TOOLS-DIAGNOSTIC-OSCILLOSCOPE_W0QQitemZ270210402594QQihZ017QQcategoryZ43989QQssPageNameZWDVWQQrdZ1QQcmdZViewItem


    Thanks for the info.  I will look at them a little closer.  :2thumbs:
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    Offline Jacksboys

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    Re: Engine loses power around 5000RPM
    « Reply #113 on: February 10, 2008 - 04:33:28 PM »
    Quote from: bullitt99 on February 10, 2008 - 01:59:50 AM
    Are you using the vacuum advance?...if so disconnect it & see what the results are.

    I am using a vacuum advance distributor, but I do not have the vacuum connected. 

     :clueless:  Would leaving it unhooked cause a problem?
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    1971 Dodge Challenger:  360/904/3.23
       
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    Offline Jacksboys

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    Re: Engine loses power around 5000RPM
    « Reply #114 on: February 10, 2008 - 04:35:29 PM »
    Quote from: HP2 on February 10, 2008 - 06:52:28 AM
    A thought from out of left field, but, have you ever replaced the filter sock on the pick up tube in the gas tank? I don't know how that would affect the erratic tach reading, but I could see it restricting fuel flow at high rpm if it is some what clogged.

    Quote from: ChallengerHK on February 10, 2008 - 09:52:37 AM
    :iagree: I didn't think about the filter sock, but many years ago I had a fuel filter that had been on since the car was built (I think) probably for close to ten years. It was almost completely clogged. Fuel could flow at idle and cruise, but when I'd nail it I'd get power for a couple of seconds, then it would fall off sharply from starvation until the fuel pump could catch up through the restriction, then I'd get power again. I found out by accident what was causing the problem when I got a fuel filter clearanced for a buck at the local Dodge dealer and once I put it on the problem went away.


    The gas tank, pickup tube, sock, and fuel lines were all replaced about two years ago when I put the motor in the car.   :2thumbs:

    I have a 3/8" fuel line, with two see through filters, so I can tell that it is not clogged.   :2thumbs:
    « Last Edit: February 10, 2008 - 04:37:26 PM by jacksboys »
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    1971 Dodge Challenger:  360/904/3.23
       
    Success is the maximum utilization of the ability that you have. - Zig Ziglar

    Offline MEK-Dangerfield

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    Re: Engine loses power around 5000RPM
    « Reply #115 on: February 10, 2008 - 04:36:37 PM »
    Quote from: jacksboys on February 10, 2008 - 04:33:28 PM
    I am using a vacuum advance distributor, but I do not have the vacuum connected. 

     :clueless:  Would leaving it unhooked cause a problem?

    No. As long as the vacuum advance port in your carb is plugged.
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    Mike

    1970 Challenger - SOLD
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    Offline Jacksboys

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    Re: Engine loses power around 5000RPM
    « Reply #116 on: February 10, 2008 - 04:38:12 PM »
    Quote from: MEK-Dangerfield on February 10, 2008 - 04:36:37 PM
    No. As long as the vacuum advance port in your carb is plugged.

    It is, thanks   :2thumbs:
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    1971 Dodge Challenger:  360/904/3.23
       
    Success is the maximum utilization of the ability that you have. - Zig Ziglar

    Offline Chryco Psycho

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    Re: Engine loses power around 5000RPM
    « Reply #117 on: February 10, 2008 - 05:06:49 PM »
    have you tried disconnecting the tach maybe the tach us grounding the ign
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    Offline Jacksboys

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    Re: Engine loses power around 5000RPM
    « Reply #118 on: February 10, 2008 - 05:12:21 PM »
    Quote from: Chryco Psycho on February 10, 2008 - 05:06:49 PM
    have you tried disconnecting the tach maybe the tach us grounding the ign

    I guess that is possible, but then I would not be able to see the problem as easliy.     :clueless:  If it was the tach, would it change the problem rpm (from 3000 to 4500) when I changed the distributor?   :dunno:
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    1971 Dodge Challenger:  360/904/3.23
       
    Success is the maximum utilization of the ability that you have. - Zig Ziglar

    nivvy

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    Re: Engine loses power around 5000RPM
    « Reply #119 on: February 10, 2008 - 06:26:57 PM »
    I with MEK its electrical....... my 499 had the tach all of a sudden start acting erratic and going bonkers.... It was the wire going into the alternator would wiggle off somehow and I would lose power etc.....then the tach would go bonkers.......

    Check all the tach wires an see if something is grounding somewhere cause it is tied in with your ignition........  :2cents:

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