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Thread: code 56 98

  1. #1

    Default code 56 98

    how to fix

  2. #2
    I'm an air-conditioned gypsy gadget73's Avatar
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    56 is usually a bad MAF or a short in the wiring. You're getting full 5v reference voltage back to the ECM.

    98 is probably because of the MAF. Its a hard fault in the ECM, basically meaning some sensor input is completely bonkers and its ignoring things.

    try unplugging the MAF and see if the codes change. If they do not, examine the wiring between ECM and MAF for shorts. If they do, the MAF is probably dinked.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

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  3. #3
    My screen name is GREEN, Bitches ! 88grandmarq's Avatar
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    what Gadget said...

    56 is MAF circuit above maximum voltage.

    98 is FMEM (failure mode effects managment) which means the ECM is ignoring the signal from the MAF and running on a previous, good static value.

    faulty/incorrect wiring or failed MAF.
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  4. #4

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    Found couple wires frayed took them apart and re-solder them now everything is fixed now my problem is it doesnít wanna start when it reaches temperature
    195 up starts up cold and when itís below 160.

  5. #5
    Beater gonna beat sly's Avatar
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    Last time I had issues with that, it was the engine coolant temp sensor pigtail. Check all the temp sensors to make sure they're working and check the wire harness for them to make sure they have continuity back to the ECM. Unless it's not cranking at all... that would be the thermal lockout in the starter gone to crap.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  6. #6

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    changed coolant temp sensor and act also.ill check wires next

  7. #7

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    all wires are good

  8. #8
    Beater gonna beat sly's Avatar
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    Have you verified that the new sensors are good?
    ECT: http://www.grandmarq.net/oldfuelinjection/page28.html
    ACT: http://www.grandmarq.net/oldfuelinjection/page29.html
    test them cold... warm it up and then test them again. If they don't change, you got a bad one. The ACT may not change much, but it should get a little warmer.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  9. #9

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    sensors are good checked codes got code 11 on koeo koer
    Last edited by rellik god; 10-23-2018 at 02:13 AM.

  10. #10
    Beater gonna beat sly's Avatar
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    Weird. Guess something that was unplugged and plugged back in had a bad connection and that solved it.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  11. #11

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    doesn’t wanna start when it reaches temperature problem still have

  12. #12
    I'm an air-conditioned gypsy gadget73's Avatar
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    you measured the sensors at temperature to confirm they read properly when warm ? They can give faulty readings but still within the range of ECM acceptable so it won't code.

    Does it start if you add some throttle?

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  13. #13
    Beater gonna beat sly's Avatar
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    There were times the Mad Marquis would take a full 5 seconds to crank over.

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  14. #14

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    measured the sensors at temperature

  15. #15
    I'm an air-conditioned gypsy gadget73's Avatar
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    your starter sounds slow and uneven. Might be the problem.

    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC SE, triple black (Timewarp) - poly front bushings, KYB struts and shocks, Holley SystemMax1 lower intake, SilverFox AOD valve body,

    1984 Lincoln Continental TurboDiesel - rolls coal

    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  16. #16

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    brand new starter and new red top optima

  17. #17
    Member Giraffe's Avatar
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    One possible thing to look into: I've had two Ford vehicles over the years that eventually suffered from a corroded starter power wire (wire from the solenoid to the starter). It would crank just fine when cold, but would either crank very slowly or just click solenoid when hot. The engine bay temperature would be enough to raist the temperature of the corroded wire to the point that not enough current would get to the starter to start the engine. The symptoms seem more like a dead battery, but yours is new. I did originally did the same thing as you (replaced battery with Optima red top and new starter), but still had the problem until I replaced the starter cable.
    óJohn

    1990 Mercury Grand Marquis LS - getting her back in shape (POTM March 2017)
    1995 Mustang Cobra coupe - keeping it simple
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  18. #18
    Beater gonna beat sly's Avatar
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    What were the measurements of the temp sensors at temp?
    Also, have we checked the grounds on the engine?
    Are the ECM and fuel pump relays working right? Are they loose in the connectors?

    Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
    rides: 88 MGM (SOLD), 93 Vic, 2000 Crown Vic, 2003 Expedition
    Quote Originally Posted by gadget73
    ... and it should all work like magic and unicorns and stuff.
    Quote Originally Posted by dmccaig
    Overhead, some poor bastards are flying in airplanes.

  19. #19

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    Relocated battery to rear all new 0gauge wire.did voltage drop test cold and hot nothing wrong there.when hot I have spark and fuel pressure it just doesnít run it just cranks.put new distributor with ford pip new relocated tfi cap rotor plugs wires new coil.all new act ect MASS-AIR sensors checked all wires fuse links also swapped cpu with good one and problem still there Iím lost on this

  20. #20
    Wagon Addicted Tiggie's Avatar
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    To me it sounds like the timing is advanced way too far. Rotate your distributor counterclockwise and see what happens.
    1988 Crown Vic Wagon - daily
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