94 SLS 4.6l, code P071
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Northstar Engines and System Technical Discussion Discussion, 94 SLS 4.6l, code P071 in Cadillac Engine Technical Discussion; I recently got a 1994 SLS 4.6l. It ran ok for a month or so, when I began experiencing intermittant ...
  1. #1
    ddias1 is offline Cadillac Owners Member
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    Question 94 SLS 4.6l, code P071

    I recently got a 1994 SLS 4.6l. It ran ok for a month or so, when I began experiencing intermittant rpm surges. Idle was 625-650rpms at initial start-up, and usually didn't vary much. Now, almost everytime I start it, it sounds like its idling in 650rpm range until the system monitor checking status is done. As soon asit says its ok, the idle surges to 725rpms, and then drops quickly and rises even higher 1000-1350 etc, until it will stall. I came up with code P071, P032 codes. I guess my question is, could a leaky vacuum manifold on the throttle body trigger MAP fault codes? This is my first Cadillac/N* and am hesitant to jump into testing MAP sensor, if there are other
    Possible causes to test as well.
    This forum is AWESOME!!!! Thanx for any advice!

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    ddias1 is offline Cadillac Owners Member
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    Re: 94 SLS 4.6l, code P071

    Also, it seems to happen more often when when fuel is 6 galllons or less, and when temps outside are above 75°. Other codes from history P070, P032, P034, P090, P095, S044, S036. I don't know how old they are so I've cleared them, so far only P071 has returned. Thanx for any input.

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    ddias1 is offline Cadillac Owners Member
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    Exclamation Re: 94 SLS 4.6l, code P071

    Ok, been driving....the persistant codes are
    P032
    P071
    P095
    Found disconnected hose? I don't see any where it would connect. Can't trace it until I put it on the lift 2morrow. Gas gauge read E, then returned to 4gal?.. Evap vacuum line maybe?
    Someone?Anyone?.....

  5. #4
    dboncio99 is offline Cadillac Owners Member
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    Re: 94 SLS 4.6l, code P071

    I have same issue with idle and dying. THis is after replacing starter. I replaced gaskets and cleaned intake etc, but lots of carbon build up. Runs pretty good and then will just die. I have a P095 code as well. Did you find the problem??

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    ddias1 is offline Cadillac Owners Member
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    Re: 94 SLS 4.6l, code P071

    Well, its been a while, but I've begun t-shooting my codes/surging again. The MAP and TPS circuit's are fine, both sensors are fine. The PCM was the only thing on the circuit left, so I replaced it as well as the prom, completed the learn procedure. During the test drive, it ran great for about 2 miles, then began exhibiting the same symptoms and triggered the codes again..?
    Wondering if a bad ISC could cause these symptom's?..

  7. #6
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: 94 SLS 4.6l, code P071

    All of your codes point to a bad MAP sensor, including the TPS code.

    How did you test the sensor and circuitry?

    My suggestion - key on, enter diagnostics, select PCM Data "PD02".

    Should be about 100 +/-10.

    Start engine. Check the same. Should be about 30.

    If either of these conditions don't check out, your map sensor or circuitry is faulty, and you can go further to test what the problem is.

  8. #7
    ese
    ese is offline Cadillac Owners Member
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    Re: 94 SLS 4.6l, code P071

    i have this same code, same reving problem in a 94 deville, before engine start it was at 99 after it was at 46-48 does this mean the MAP sensor is faulty or is that also within range?

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