‘90 348- intermittent power loss. Like flipping an on/off switch. | Page 4 | FerrariChat
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‘90 348- intermittent power loss. Like flipping an on/off switch.

Discussion in '348/355' started by JOHNCJ8989, Jun 11, 2023.

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  1. Ferrarium

    Ferrarium F1 Veteran
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    Jul 28, 2018
    5,728
    Central NJ
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    Eric
    #76 Ferrarium, Jun 21, 2023
    Wiring you can check by wiggling the plug a tad while its idling.

    How do you know what side an issue exists on currently? To swap mafs and see if the problem moves, you need to identify a specific problem on a bank and see if the problem moves like CEL lights moving to the other bank.
     
  2. JOHNCJ8989

    JOHNCJ8989 Formula Junior

    Dec 11, 2003
    520
    Full Name:
    John
    #77 JOHNCJ8989, Jun 21, 2023
    I only know the issue is with the right side MAF. If I swap the left MAF to right I can isolate the issue to either the MAF itself or other issues related to the plug, maybe. In theory if it is bad I should be able to run left side unplugged and right side plugged. I did wiggle the harness prior to unplugging the MAF and it made no apparent changes. I’m not convinced my CEL light is working at all because it’s never triggered. I’ll check and see if the bulb had been pulled.

    Crazy that the car runs perfectly fine with the MAF unplugged right now..
     
  3. Ferrarium

    Ferrarium F1 Veteran
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    Eric
    #78 Ferrarium, Jun 21, 2023
    When you energize the cars power on with the key, but don't fire it up, the CEL light should illuminate momentarily demonstrating the bulbs are fine.
     
  4. KevZep

    KevZep Formula Junior

    Feb 17, 2020
    568
    New Zealand
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    Kevin Bennett
    #79 KevZep, Jun 21, 2023
    What about re-seating the two ECU connectors?
    You never know, at this point it wouldn't hurt to keep eliminating things.
     
    JOHNCJ8989 likes this.
  5. 72GMC

    72GMC Karting

    Aug 15, 2006
    157
    Calgary, AB, Canada
    Full Name:
    Paul
    #80 72GMC, Jun 22, 2023
    Question:
    Is this truly random, or does it happen under certain driving conditions.
    For example, does it happen under sustained cornering, and then correct itself once the road straightens out?
     
  6. JOHNCJ8989

    JOHNCJ8989 Formula Junior

    Dec 11, 2003
    520
    Full Name:
    John
    #81 JOHNCJ8989, Jun 22, 2023
    Totally random, but more so under light acceleration, usually at around 3200 rpm. Comes and goes as it pleases, but still running perfectly with one MAF disconnected. Haven’t run anymore tests on it but will this weekend.
     
  7. fdekeu

    fdekeu Formula Junior
    Silver Subscribed

    Jun 19, 2008
    633
    Belzium
    Full Name:
    Frank
    #82 fdekeu, Jun 29, 2023
    I have had a very similar problem (intermittent power loss) on my 348TS 1191 for some years
    Checked/Replaced:
    Checked MAF sensors
    Checked electric connectors in the motor compartment, they looked fine
    Fuel filters
    Fuel pump rubbers: old ones were not too bad
    Crank sensors: plugs desintegrated upon disassy
    After that I experienced less problems and I decided to drive the car to Switzerland, 750km away
    After an hour on the motorway the stuttering returned and I had to stop
    The only thing I could do before calling the tow truck was to clean the electric connections going to the ignition coils
    I restarted and the problems is gone!!
    Done 500km since
     
    Qavion and JOHNCJ8989 like this.
  8. 72GMC

    72GMC Karting

    Aug 15, 2006
    157
    Calgary, AB, Canada
    Full Name:
    Paul
    #83 72GMC, Jun 30, 2023
    Contact cleaner, horse-hair brush, Stabilant 22A?
     
  9. Dino L

    Dino L Rookie

    Oct 29, 2018
    35
    sacramento, ca
    Full Name:
    William D Lozano
    #84 Dino L, Jul 16, 2023
    My 89 348 was having a similar issue off and on for a couple years. During the major this year Ben Salerno found one of the cam position sensors very corroded. Since that was taken care of I have not had any more cut out or searching idle issues.
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    Sent from my iPhone using FerrariChat
     
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