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Thread: crank no start

  1. #1

    Default crank no start

    1995 crown vic died while driving, does not start again, checked for spark, fuel (40 psi with guage), and a crank signal, all are ok, also pulled the fuel pump relay and sprayed throttle body cleaner through the intake and tried starting it (possiblity of bad fuel) also checked for injector pulse, the car cranks strong and sometimes sounds like it wants to start, any ideas for what should be done next, thanks in advance for any help/ suggestions

  2. #2
    I'm an air-conditioned gypsy gadget73's Avatar
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    If flammable stuff in the intake won't make it go, it pretty much has to be a spark issue. Usual problem on these is something wanky with the crank position sensor. Either it failed or the connector is crusty. its down bottom, passenger side, kind of straight in from the AC compressor.

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

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  3. #3

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    could it still be bad even if there is rpm reading while cranking and reading rpm with the scan tool?

  4. #4
    Member EaOutlaw1969's Avatar
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    Does it spin over faster than normal? I always like to check compression at least on one if not all cylinders
    2000 MGM LS Palm Beach Edition a work in progress

  5. #5
    Stow It! GM_Guy's Avatar
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    Check for voltage for any feeds coming off the ignition switch. Don't see much if any failure on the column mounted ones, but it is a ford afterall, and electrical switches always are suspect.

    Alex.

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    Beater gonna beat sly's Avatar
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    Quote Originally Posted by 1985crownvicltd85 View Post
    could it still be bad even if there is rpm reading while cranking and reading rpm with the scan tool?
    Yes. Check for codes. May be the Cam sensor. Check and make sure the connector is actually on the cam sensor. Codes will tell you if it's getting no signal from a sensor.

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  7. #7

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    update: with the scan tool hooked up there are no codes, checked live data and noticed engine load is at 100%, unplugged the maf sensor, ect, cam, and crank sensor and checked to see if the reading would change, it didnt, what other sensors contributes to give this reading?

  8. #8
    Beater gonna beat sly's Avatar
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    TPS. Unplug that, plug everything else back in. See if it starts. If it does, replace the TPS. FULL open throttle on startup disables ignition and fuel to "clear flood".

    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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    tried tps too no difference.

  10. #10
    Beater gonna beat sly's Avatar
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    TPS. Unplug that, plug everything else back in. See if it starts. If it does, replace the TPS. FULL open throttle on startup disables ignition and fuel to "clear flood".

    Might also check to make sure the throttle isn't broken and wide open already.

    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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    when pushing on the pedal the percentage of the tps on the scan tool changes, but ill check anyways to make sure it isnt broken.

  12. #12

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    update 2: throttle isnt broken, and opens and closes fine, next step is compression test, can someone tell me the range for compression on the 4.6l, I believe its around 90 psi, but hopefully one of you can confirm that, thanks

  13. #13
    I'm an air-conditioned gypsy gadget73's Avatar
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    I'd expect closer to 150 is right.

    If it was running and just stopped without making some absolutely horrible noise or driving through a small lake its not likely to lose compression in all 8 cylinders. Engines will run with a couple of dead holes. If ether in the intake doesn't make it start, either you don't have proper spark or somehow the cams jumped time, which also seems a bit unlikely. The tensioners do wear but you'd be getting a bunch of noises before it got bad enough to jump. Its also not that likely to have both cams jump at once. The only thing really common to all of the cylinders ignition-wise are the power feeds to the coil and the EDIS module. Each coil pack is basically 2 coils in one box, so even if one went bad you'd only lose 2 cylinders. The chances of all the coils dying in one shot is really small.

    I'd give it a honk of starting fluid into the throttle body and see what happens. If it starts for a few seconds, its a fuel delivery problem. If it does nothing, its probably a spark problem. If it doesn't crank normally, maybe you're that unlucky soul that managed to have both cams jump at once.

    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

  14. #14

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    Final update: did a compression test and had around 150-160 on the left bank, then checked the right and had 0 compression, the engine only had 135k.

  15. #15
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    So a timing chain or gear. I don't know but I have not heard these are interference engines.
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    Member EaOutlaw1969's Avatar
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    I am glad you figured it out, I was pretty sure it had to be a compression issue based on the information you gave us.
    Now the fun can start if your going to try and save the car.
    2000 MGM LS Palm Beach Edition a work in progress

  17. #17
    Beater gonna beat sly's Avatar
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    Easiest/cheapest fix... just swap in a known good longblock. You can use anything from 93-2000 without mods. 92 is a weird year and may have the wrong transmission mount if it's an early car. 01+ will need the newer intake as well. You'll have to keep your oil pan and timing cover. The rest should be plug and play. 95-2000 are best options for just get it done. and should avoid I think it was 2001/2002 that had the weak timing guides, but taking off the timing cover, those are an easy replace.

    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.

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