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fishchoke

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  • Location
    Dallas, TX
  • Cars
    1983 280ZX NA 2+2
  • Interests
    24 hours or lemons, chumpcar, wrl, and getting more team members to join my race team.

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  1. I recently rebuilt my 1983 L28E NA with stock EFI and have just broken it in. At idle, it's fine. At WOT, also fine. But, at low to mid throttle, I'm finding intermittent hesitation between 2000 rpm and 4000 rpm. The hesitation is accompanied by spikes on my AFR gage, apparently going full lean for some reason? I did an rpm sweep in the garage to track the behavior. Please check out this video: https://photos.google.com/share/AF1QipPxmRYeqaIboI-dYGBOa_D8to9BfRFtVQkn6gCEApu5WDoBG8ypbBQ42FPvRJFIXw/photo/AF1QipPUD1Bv65KMuSeHtmpc05PfFT3VL3YosIyob2O-?key=bXhJYlhOUE5ldGE0QzlKN0t2MlQtcWVDV3RvU1B3 At 2000 rpm, it starts acting like there is a rev limiter, but there isn't one. The power seems to be cut in short pulses, which are repeated very consistently, leading me to beleive the ECU is doing this intentionally. The AFR gage shows spikes going full lean, as though the fuel is being cut momentarily and then restored. Does anyone recognize this? I'm going to start checking out the TPS, AFM, ECU, O2, and all the associated wiring, but I was hoping maybe someone had seen this before, or had any clues for me? Thanks, Nate
  2. So there is this funky rubber bumper bracket thingy that goes between the 'engine mounting insulator' and the 'engine mount bracket', on a 1983 280zx 2+2 NA. Nissan parts lists it as a 'engine mounting rubber stopper' (see diagram below). I looked everywhere online already. What the hell is this thing and what is it supposed to do? It must have a reason for existing, Nissan wouldn't have done it for no reason. The only thing I can figure is that if the isolators fail, this keeps the engine from sliding off, like a backup or something. Installing the engine mount bolts is a major pain because this thing gets in the way of the bolts/nuts/tools during installation. What happens if I just throw these away and mount the engine brackets directly to the engine mounting isolaters?
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