99 STS engine reinstallation question/problems
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Northstar Engines and System Technical Discussion Discussion, 99 STS engine reinstallation question/problems in Cadillac Engine Technical Discussion; Over the past two weeks I have removed the cradle and had the block studed and lower half sealed. The ...
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    kobrien8 is offline Cadillac Owners Fanatic
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    99 STS engine reinstallation question/problems

    Over the past two weeks I have removed the cradle and had the block studed and lower half sealed. The engine is back in the car and starts, runs rough with 15% throttle, then dies when returned to idle. I keep getting P1010-mass or volume air flow circuit range/performance. The mass air sensor was working fine before I pulled the engine so I am not sure that just replacing the sensor will do the trick, although there isn't really anything upstream that would affect the mass air sensor. Right? Also, will having the gel from the spark plug wire set on the plug electrodes have any negative effects? Thanks!

    PS I am new here!

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    Ranger's Avatar
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    Re: 99 STS engine reinstallation question/problems

    Where is the MAF sensor on your engine? One the TB or upstream in the duct?

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    kobrien8 is offline Cadillac Owners Fanatic
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    Re: 99 STS engine reinstallation question/problems

    It is in the duct I am almost certain. I am going to double check

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    JimD is offline Cadillac Owners Connoisseur
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    Re: 99 STS engine reinstallation question/problems

    Quote Originally Posted by kobrien8 View Post
    ....I keep getting P1010-mass or volume air flow circuit range/performance.
    P1010 is not a valid code. You read it wrong or typed it wrong.

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    kobrien8 is offline Cadillac Owners Fanatic
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    Re: 99 STS engine reinstallation question/problems

    Sorry! P0101. That's what I get for doing this via smart phone in the middle of nowhere!

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    Re: 99 STS engine reinstallation question/problems

    If it's in the duct, be sure you don't have a leak behind it. Check the clamp at the TB.

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    kobrien8 is offline Cadillac Owners Fanatic
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    Re: 99 STS engine reinstallation question/problems

    The MAF is definitely in the duct. Also, if this helps, my freeze frame data for the MAF is 3.072 lb/min

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    JimD is offline Cadillac Owners Connoisseur
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    Re: 99 STS engine reinstallation question/problems

    Quote Originally Posted by kobrien8 View Post
    Sorry! P0101. That's what I get for doing this via smart phone in the middle of nowhere!
    P0101 - Mass Air Flow (MAF) Sensor Performance

    Your MAF is that 2.5" section of rigid intake air plumbing immediately upstream of the throttle body. Triple check the wire harness integrity and security / cleanliness to the 3 pin connector on the firewall surface of the MAF.

    Maybe your Smart phone isn't??

    Someone give me clue why this Seville question was arbitrarily moved to the Northstar section. Please.

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    kobrien8 is offline Cadillac Owners Fanatic
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    Re: 99 STS engine reinstallation question/problems

    I wondered that myself about the question being moved but since I am new here I Just figured that I didn't use the right question asking protocol. Everything looks good as far as wiring and connections go. Should I Just spend the $100 and buy a new sensor? Is this what is causing the rough running?

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    JimD is offline Cadillac Owners Connoisseur
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    Re: 99 STS engine reinstallation question/problems

    Quote Originally Posted by kobrien8 View Post
    .....Should I Just spend the $100 and buy a new sensor?
    That would be your call! If there is any possibility your MAF was exposed to nasty fluids or physical damage during the cradle R & R, MAF replacement "might be" your solution.

    Is this what is causing the rough running?
    Most likely, at this point.

    Sorry to be so wishy-washy, but your model of MAF is a "delicate" part. My background always points me to wiring as the first failure possibilty to eliminate.

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    Re: 99 STS engine reinstallation question/problems

    Thanks for the help! I am also curious as to if the gel in the plug wire pack was applied to the plug electrodes would cause rough running as well? My assistant (buddy) informed me that he put the gel on the electrodes thinking it was to make a better connection. Guess a new maf sensor is in my future!

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    Re: 99 STS engine reinstallation question/problems

    I'd check the wires again before buying another unit. You'd be surprised how one wire might wiggle out of the connector and "look" like it's making contact and it really isn't. I had a problem with an egr valve code, bought a valve and all only to find out when i went to install it, one of the wires came out of the connector.....

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    Re: 99 STS engine reinstallation question/problems

    Are you saying that someone put dielectric silicone ignition grease on the spark plug tips ???

    That stuff is for plug and coil boots and the seal rings on electrical connectors: It's an insulator !!!

    If this is all about the 1999 as indicated in the thread title, then your MAF is bolted directly to the throttlebody and the IAT in down by the filter box. If it's the 2003 then the MAF is in the flex intake duct and the IAT is incorporated in the MAF.....

    Early MAF..................................2000+ MAF..................... correct plug wiring

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    Re: 99 STS engine reinstallation question/problems

    Someone give me clue why this Seville question was arbitrarily moved to the Northstar section. Please.
    Because it was strictly an engine (Northstar) question and seemed more appropriate here. I can move it back if everyone thinks it belongs in the Seville section.

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    stoveguyy is offline Cadillac Owners Connoisseur
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    Re: 99 STS engine reinstallation question/problems

    were plugs original or new? a leaky headgasket will/can foul up plugs. maybe try a new set. your assistant applied gel to the tips? did you see him do it? what else did he do on this job while your back was turned?

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