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  1. #1

    Default Runs different between 2K-3K rpm

    So I changed lower and upper intake gaskets. Put blockers on the lower intake for egr and deleted egr from spacer with Kit for LMR. Got it all back together and now between 2K-3K rpm the exhaust changes sounds and almost seems like it loads up. Over 3K it seems fine. I'm lost not sure where to start.

    Car is 86 GT 5spd
    Trick flow top end kit
    mass air conversion with A9L

    Ran fine before gaskets and egr delete. Maybe replace all vacuum lines?

    Thanks
    Last edited by Ryan86GT; 06-20-2017 at 04:29 PM.

  2. #2

  3. #3

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    Yea I would check the vacuum lines to the intake I change the gaskets on my 86 and put it all back together and it started acting funny on me took the intake back off and inspected it all and changed the lines now it runs fine u could very well have a vacuum leak from ur lower intake

  4. #4
    FEP Super Member erratic50's Avatar
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    Did you remove the cats?

    BTW - I would put it back to EGR equipped. Exhaust gas is drawn in instead of air when you don't need to make much power. This dynamically reduces the CFM of oxygenated air is drawn in. This reduces fuel requirements and therefore improves MPG.

    At full throttle it disables itself so it costs no horsepower.
    Last edited by erratic50; 06-21-2017 at 01:11 AM.

  5. #5

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    Quote Originally Posted by 85cammedfox View Post
    Yea I would check the vacuum lines to the intake I change the gaskets on my 86 and put it all back together and it started acting funny on me took the intake back off and inspected it all and changed the lines now it runs fine u could very well have a vacuum leak from ur lower intake
    Awesome thanks I'll pull upper back off.

  6. #6

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    Quote Originally Posted by erratic50 View Post
    Did you remove the cats?

    BTW - I would put it back to EGR equipped. Exhaust gas is drawn in instead of air when you don't need to make much power. This dynamically reduces the CFM of oxygenated air is drawn in. This reduces fuel requirements and therefore improves MPG.

    At full throttle it disables itself so it costs no horsepower.
    Cats where removed before I got car. Also coolant lines going to egr spacer where blocked when I got car. So that made me want to just get rid of it. If anything Id just put egr back on spacer and hook up. I'm not tearing back down to lower intake to take out blockers.

  7. #7

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    Quote Originally Posted by erratic50 View Post
    BTW - I would put it back to EGR equipped. Exhaust gas is drawn in instead of air when you don't need to make much power. This dynamically reduces the CFM of oxygenated air is drawn in. This reduces fuel requirements and therefore improves MPG.
    Respectfully, IMHO, not in the real world. Introduction of inert gases that take up space ("EGR", artificial overlap, that a camshaft with increased overlap provides sane dynamic amounts of naturally) in cylinders requires comparatively richer fuel mixtures to avoid misfiring, which in turn would get MISread as lean by O2 sensors... and the wheels on the bus go 'round and 'round, lol. Longer duration, increased overlap camshafts ALWAYS require increased idle and just off-idle fueling... off-idle, exactly where/when EGR gets introduced in these smoggers.
    Mike
    1986 Mustang convertible ---> BUILD THREAD
    Past Fox-chassis "four eyes":
    1983 Mercury Cougar LS
    1986 Ford Thunderbird ELAN
    1980 Capri RS Turbo

    Work in progress website ---> http://carb-rebuilds-plus.boards.net/

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