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Thread: Puzzling/ Happy Motor?

  1. #1
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    Default Puzzling/ Happy Motor?

    Hi; first ill list performance mods
    1 headers and flowmasters
    2 msd coil
    3 HO intake 65mm TB
    ok heres the story i got this car with 195,000 on odometer, but car doesnt run like it, i noticed when i got it none of the gauges worked, so i bought all new sensors and found that sensors on car where for a non gauge car, so that leads me to believe engine has been swapped. i removed smog pump, car ran better. deleted egr, because it was bad, car runs better, installed headers, down pipes have no 02 bungs so no 02 sensors, car runs better yet. car has NEVER idled correctly to high or to low so disconnected IAC today and set idle, no more idle issues and car runs even better now. im wondering if somebody put in a new ecm for like a tbi car or if the motor is non roller. any ideas im puzzled ....LOL.

  2. #2
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    Well you should reconnect the oxygen sensors. The car will eventually run bad without them.

    Also run codes. See what's up with the computer.
    '88 Thunderbird LX: 306, Edelbrock Performer heads, Comp 266HR cam, Edelbrock Performer RPM intake, Edelbrock 70mm TB, 76mm C&L MAF, 30lb injectors, 2.5" exhaust, AOD with 2800 PI converter, 8.8 with 3.73 gears, 31 spline Traction-Lok, 31 spline Moser axles, 04 Cobra front arms, Maximum Motorsports extreme duty rear arms, subframes.
    '11 Focus, '12 Mustang 3.7, '17 Accord EX-L V6

  3. #3
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    Hi, what i guess im saying is the more stuff i disconnect the car runs alot better, only thing hooked up is the tps sensor and the 2 servos hanging on upper plenum, car has never run better,oh the 02 sensors have been off for 6mnths.

  4. #4
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    Welcome to 10 mpg. The car won't run right without them.

    Pull the kick panel, get the computer code, check firing order and injectors. Mileage really doesnt matter, the condition of the engine does. My car has 333k miles on it and will still bark the tires on a hard launch. My first 86 had 200+k when I bought it and it would smoke a tire till 40mph. It still had stock spark plug wires from 1985 on it. These cars are really, really easy to make run right and with the e10 here I can bump timing up till it won't pass emissions without pinging.

    I've bypassed my smog pump because it locked up on me. Cant tell any difference, same with egr on my last car, it only had o2's and map sensor and passed emissions but failed visual for the bypassed smog.
    Quote Originally Posted by jcassity
    I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
    Hooligans!
    1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
    1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
    1986 cougar.
    lilsammywasapunkrocker@yahoo.com

  5. #5
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    No o2 may make 15-18 mpg but they'll do 25 with, I gotten over 26 with mine and 3.73 gears... A leaking EGR will give idle issues and maybe at WOT if it really bad, but disconnecting it won't fix those problems... Correct adj of base idle and setting TPS voltage around .9v fixes most idle issues...

    Looks like lots of hacking going on here...






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  6. #6
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    Hook all your stuff back up. EVERYTHING.

    Read through the following 3 links, please:

    http://sbftech.com/index.php/topic,1031.0.html

    http://sbftech.com/index.php/topic,2471.0.html

    http://sbftech.com/index.php/topic,849.0.html

    Have a good one.
    -- 05 Mustang GT-Whipplecharged !! -- 87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's! http://www.fquick.com/V8Demon

  7. #7
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    Hey; im not getting worse gas mileage its actually better, and alot more power and idles perfectly smooth, no surges. thats whats puzzling me, its the best its ever ran since i got the car. spark plugs are nice and tan, i even have the timing at 12 instead of 10. would a non roller motor make the difference?

  8. #8
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    Im gonna pull intake this weekend, has small oil leak at front corner, and will run block # like i said before i think motor has been changed because of the sensors all being wrong.

  9. #9
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    What spark plugs does your engine use.??? Other than '86 HO, only the '86 to '91(I'm incl full size) So 5.0 use the ¾" reach plugs...






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  10. #10
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    Sounds very interesting. I'll be curious to see what you find out.
    Cornfed85

    1985 Thunderbird - 3.8 V6, C5

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