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  1. #1
    Established Member Two Rings
    Join Date
    Aug 10 2014
    AZ Member #
    273221
    Location
    Ohio

    2000 A8 random stalling

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    Good morning, we recently got a 2000 A8L, it's running great now, in spite of not even starting when we got it. PO had replaced fuel pump and done some coarse tests to verify function (pulled the fuel line and gas came out). Anyway, car runs well, but my girlfriend reports that it stalls once in a while when taking off from a stop. I cleaned the MAF, which looked brand new and not at all dirty. Using my very generic scanner, I get the following codes: P1118
    P0140
    P1114
    P0432
    Idles at just about 5-600 rpm. No jerkiness or hesitation when driving, save for the occasional stall.

    These seem to point to an O2 sensor, except the P1118, and I've replaced the coolant temp sensor. Before I did that, the P1118 code would pop up the second I put the car in gear. Now it doesn't give me any codes until it's been driven a mile or so. I want to check the fuel pressure, because god knows what kind of chinese fuel pump the PO put in. A few other items which may or may not be related:

    There is a broken bolt on the air filter housing. Front drivers side corner. I have to get in there and drill it out. If nothing else this is letting dirty air past the filter.

    Under the air filter, there is the big assembly of some sort, looks like an air pump or something? Not sure, I am unfamiliar with this car. Very dusty down there, going to get in there and clear it out as gently as I can.

    Had a misfire code for cylinder 5. That code has not come back since I first cleared it.

    After I got the car running, I drove it a block or two. Came home and popped the hood to find that the intake hose was just sitting there in place, but not clamped on at all. PO had also not bolted one of the wheels back on tightly, as my understandably irate mechanic told me after he test drove it.

    It MAY have an exhaust leak. I took it to a shop for a coolant flush and "safety" check. I assumed they would have told me it had a leak, but they didn't say anything about the 4 codes it had when I picked it up, either. I had to take the car that day, it needed a salvage inspection (long story, but the car was not wrecked or in a flood). It's a little loud, I suppose, but being unfamiliar with the car, I'm not sure what the basis for comparison is. My girlfriend says it seems loud, but from inside, it just sounds like a big V8 to me.

    So basically, the only thing we can't live with is the random stalling. Car runs like a champ, you step on the gas, and it definitely goes Going to get the O2 sensor replaced anyway, since we'll need it to pass E-check. I don't want to just throw parts at it, of course. I'm trying to convince her to let me get rosstech, since we now have 2 audis and it will be worth it in the long run. My A4 has given me virtually zero problems in 5 years, so there has been little need for it to this point.

    So if anyone has any insight/experience with this, I'd love to hear it. I have googled the crap out of this, MAF sensor was contestant 1, some forums say MAP sensor, but my understanding is that the 4.2 NA doesn't have that part. And of course most of the results are for A4 and A6. Apparently not many people mess with an A8 on their own.
    2001.5 1.8T FWD/K0mpresd tune (anti-lag, emissions delete)/ K&N High-Performance cupholder/ Little pine tree air freshener crammed into dash vent

  2. #2
    Established Member Two Rings
    Join Date
    Aug 10 2014
    AZ Member #
    273221
    Location
    Ohio

    Ok, update here: I just drove the car all morning. Now I have a better idea of the symptoms: When coming to a stop, the rpms drop temporarily to about 2-300, then it surges back up to 5-600. It also does this *most* of the time when I put it in gear. It never stalled when coming to or at a stop, but it did stall once when I put it in drive, once when I put it in reverse, and once right after I began accelerating out of a parking spot. I have a service record of the PO having some tranny work done a while back, I wonder if it was refilled properly after the fact. I think I will be consulting a transmission specialist about this.
    2001.5 1.8T FWD/K0mpresd tune (anti-lag, emissions delete)/ K&N High-Performance cupholder/ Little pine tree air freshener crammed into dash vent



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