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420A Dying randomly while driving.

Posted by Inkdlyfe, Nov 19, 2020

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  1. Inkdlyfe

    Inkdlyfe Proven Member

    Joined Feb 23, 2016
    Summer feild, Florida
    I've made a post about this before and it seemed to have went away but now randomly has arose again... Here is what it is doing, the car starts up just fine, good afr etc. Ill drive maybe 2 miles down the road casually driving not getting on it at all, and randomly the car will just loose power. Like I turnt the key back. I even tried to put it in gear and see if it will start back up rolling and nope... I turn off the road and simply unplug the battery and bam starts right back up like nothing was wrong. I go to drive it again and bam... turns off again.. I can not figure this out. I changed my ASD. CAS. Crank sensor. Fuel filter. Battery. Everything that someone has mentioned. And it ran good for about a month and now it's acting up again. I have no cell at all after it shutting down. I had it idling for a good 20 mins in my drive way and randomly shut off with out even me driving it. Car didn't even get above 140° it was pretty cold last night so I know it isn't a temperature problem... I went out there unplugged the battery for 5 mins and bam fired back up like it never even shut down... can someone please point me in the direction of this issue ? Afr sits at 14.8 idle. Idles at 970 rpms some times 1000 . But don't jump much at all. What ever the issue is, is temporarily fixed after the whole car being restarted from unplugging the battery... I'm on no tune right now so its not a tune issue I been running no tune on low boost for a good minute now.
  2. ThunderChild

    ThunderChild Supporting VIP

    Joined Jan 5, 2012
    Rathdrum, Idaho
    Have you checked the coil pack? Sounds like an ignition related problem.
    Usually I'd say this a dead giveaway for a crank sensor going bad, but if your replacement is recent, of decent quality and not already oil fowled (and the wiring isn't oil fowled/shorting) then I'd start looking at the other components related to the ignition system.

    Street Build 979  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

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    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

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    1992 Eagle Talon TSi AWD
    manual · 1G DSM

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    awd · manual · 1G DSM
    BLACK'98DSM likes this.
  3. motomattx

    motomattx Proven Member

    Joined Dec 9, 2010
    wampum, Pennsylvania
    First of all, is it losing spark or fuel? you need to find out whats missing next time it shuts down and wont start.

    Drag Race Build 4K  10  24

    1995 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
  4. Inkdlyfe

    Inkdlyfe Proven Member

    Joined Feb 23, 2016
    Summer feild, Florida
    I think its honestly a spark issue... imma order a new crank and coil pack. Wires and plugs are new. So imma go with that route..
  5. Inkdlyfe

    Inkdlyfe Proven Member

    Joined Feb 23, 2016
    Summer feild, Florida
    Just ordered both them new...
  6. 97egl

    97egl Proven Member

    Joined Feb 6, 2014
    Brownsburg, Indiana
    Check the ground on the driver side fender area of the engine bay. I've seen 3 or 4 420a cars that work fine and then randomly die due to this ground being bad and it acts as if the key has been turned off.

    Instead of throwing parts at it you really should try and diagnose the issue. Cleaning up a ground is free but throwing parts at it is expensive and if your tossing autoparts store brand parts in it your gonna have a lot of issues down the road.

    Does it crank over when you have this issue?

    163  3

    2002 Pontiac Grand Prix GTP 40th Anniversary
    fwd · automatic · Misc Vehicles

    Street Build 239  1

    1991 Plymouth Laser RS Turbo
    fwd · manual · 1G DSM
    ThunderChild likes this.

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