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  • 90* motor issue . . .

    Here's the run-down . . .

    '93 Grand Am with the 3.3L 90* v6.
    prior owner of the car had the vehicle for about a year, supposedly the motor was replaced 6 months before he bought it (not sure why)

    anyways, he was complaining that the car in the afternoon would die out on him while coming home from work. He stated that the first light he'd come to right after getting off the interstate the car would just die and couldn't be restarted until it about 20 min later. Car wouldn't do this in the morning on his way to work. It's about a 12-15 mile trip.
    MIL was on, so he pulled codes; DTC's for a MAF and tranny PRND range - he replaced the MAF, also replaced plugs and wires, replaced the coils and ign module (coils and mod were scrapyard parts), cleaned the TB and still same prob.

    Car came into my hands at this point. Free. Did some side work for him and he just signed the title over ( )

    Well, the next day after putting the beast in the driveway, I let the car run until full hot. After it was warm enough, the car just died - eliminated the EGR being a problem, or the TCC (still being in park and all). Very hard to restart, would just crank. If you held the throttle open part way it would attempt to fire over, and if you'd go WOT at that point it would run for a brief period very poorly. I also noticed that the coolant temp gauge was kinda high (about 3/4), even though the coolant temp felt normal to touch (hot enough you'd burn your hand holding it on the rad cap for anymore than a second, no infra temp gauge close by . . .). A friend tried running the car a bit more about a week later, but I was at work so not sure what he did. Car will not fire at all now, it just cranks. Still sounds like it has compression, and still has decent spark, and is defi getting air. No problems seen with MAF or IAC.

    Any ideas where I should pick this prob back up? It's been about 8 months since I last looked at it, and I need to get it running soon, but it's got me a wee bit stumped. My fear is that she jumped time, and this is one of those motors that had the nylon inserts on the cam sprockets; not really in the mood to pull a friggin motor to fix something that stupid, y'know?
    N-body enthusiast:
    {'87 Grand Am SE - 3.0 90* v6} / {'93 Grand Am LE - 3.3 90* v6}
    {'98 Grand Am SE - 2.4 Q4} / {'99 Grand Am GT1 - 3400 60* v6}

    Current Project:
    {'90 Chevrolet C1500 Sport 350TBI}

  • #2
    Verify the ignition is firing by pulling the plug wires. A complete cut of makes me think the C3I ignition box is out or the crank sensor is shot. Get a scn tool and verfiy all sensor are reading correctly just fo be sure. I really tink its the crank sensor or the the box
    Lorenzo
    '11 DODGE Challenger R/ T Classic 57M6 Green with Envy "Giant Green Squid"
    '92 PONTIAC Grand Prix SE 34TDCM5 "Red Lobster"

    Comment


    • #3
      Since you said it has decent fire, check the fuel pressure. I've had pumps go out before with the same symptoms. One car would actually run longer if the tank was full, guess it kept the pump cooler a little longer.
      MinusOne - 3100 - 4T60E
      '79 MGB - LZ9 - T5
      http://www.tcemotorsports.com
      http://www.britishcarconversions.com/lx9-conversion

      Comment


      • #4
        update:

        car runs now, still cuts out when hot
        my dipshit friend had pulled the ign fuse and never put it back in it's slot . . . stupidass.

        anyways, like I said car runs; kinda rough at first. idle is about 750-800 which is a tick more than I'd like. When car is full hot (although temp gauge is actually 1/4 up - still below 220*), it just stops - exactly like if you turned the key off. No surging, no stalling, no revving up, just kaput. Afterwhich, it cranks and cranks (at same time, there is no spark or fuel to the motor and beating on the fuel tank doesn't change anything). If you let it cool for about 10-20 min it'll fire right back up for a while before it shuts down again.

        I'm thinkin I need to bring the mac-daddy scanner home from the shop and plug into the PCM and see what it see's - along with a fuel press. gauge so I can see what's going on there.


        Question, then, is this one of the years where the coolant temp sensor also fed a shut off to the fuel system if the motor got to hot?
        N-body enthusiast:
        {'87 Grand Am SE - 3.0 90* v6} / {'93 Grand Am LE - 3.3 90* v6}
        {'98 Grand Am SE - 2.4 Q4} / {'99 Grand Am GT1 - 3400 60* v6}

        Current Project:
        {'90 Chevrolet C1500 Sport 350TBI}

        Comment


        • #5
          i bet its the crank sensor, i had the same problem with mine, or the connector is buggered for it, when mine would heat up it would lose spark and fuel, found out that the connector for the crank sensor, thepins inside were bent and when it heated up they must have expanded and lost contact, id check the crank sensor, i bet the problem lies there, also if you need any other with the car let me know i have a 93 Grand am with a 3.3L and i just swapped a 5 speed into it and tuned the computer in it.

          Jake
          GM Goodwrench Tech - GM Certified

          1991 Pontiac Grand Prix GTP - 3.4L DOHC , 5 Speed Manual Transmission , Turbonetics 62mm turbo, Turbonectics Evolution Wastegate , Turbonetics Raptor BOV , Large Front Mount Intercooler , AEM Methanol Injection , Car is running at 11PSI currently with methanol injection.

          Runs 13.4 In the 1/4 with a 3 second 60 foot

          Comment


          • #6
            oh and also forgot to mention that i have overheated the car onetime to the point that the needle was in the red zone andthe car was still running so i dont think that it shuts off when it gets to hot.

            Jake
            GM Goodwrench Tech - GM Certified

            1991 Pontiac Grand Prix GTP - 3.4L DOHC , 5 Speed Manual Transmission , Turbonetics 62mm turbo, Turbonectics Evolution Wastegate , Turbonetics Raptor BOV , Large Front Mount Intercooler , AEM Methanol Injection , Car is running at 11PSI currently with methanol injection.

            Runs 13.4 In the 1/4 with a 3 second 60 foot

            Comment

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