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mphilleo

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About mphilleo

  • Rank
    Newbie

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  • Location
    Lincoln, ND
  • Cars
    1984 Nissan 720
  1. mphilleo

    New 720 Owner in Need of Help with High Idle

    datzenmike, thanks for explaining this to me! I followed your instructions and saw that as the truck warmed up and the choke opened, the fast idle cam moved out of the way as you said it would. The idle in park and reverse was set to about the 650-700 RPM area that was advised by the EPA sticker under the hood. The only thing I can really complain about is that the idle in park in neutral once warmed up, though lower than when it's cold, is still kind of high, maybe closer to 1000-1200 RPM...at least as it sounds to my ears. Of course, it might be related to vacuum hosing being missing from these items, though I'm not sure where they go from or where they go to.
  2. mphilleo

    New 720 Owner in Need of Help with High Idle

    After some more tinkering and investigating, I've narrowed down my issue to the fast idle cam. It seems that the adjusting screw rests too high on it after it warms up. Hopefully, there's no broken linkage, etc to be found. Can anyone speak out of experience whether the cam itself is integrated with or separate from the white piece of plastic that pivots on the metal point it's connected to (if that makes sense)? It appears that that piece of round plastic is free-rotating on the metal point and not connected to my fast idle cam. I'm trying to determine if it's broken or not. : /
  3. Hey guys/gals, I decided to register on this site because I've found a handful of helpful threads while doing some initial troubleshooting on my 720. For those who are curious, it's an '84 with the Z24 and automatic transmission. When I bought it, it ran fairly well, though it had a tendency to hesitate from a stop if you didn't feather the pedal. Regardless, it still got me home all right, so I was enthused. I did with this truck what I usually do with any vehicle I buy used. Do a little going over and tuning up/deferred maintenance. I'm not savvy regarding the correct lingo, so please be patient with me as I describe my issue. :) When I bought it one of the thicker hoses coming from the air filter housing was plugged off by a screw and although there were a lot of OEM-looking rubber plugs on some of the carburetor hose barbs, there were still missing hoses that I couldn't identify the routing for and replace. It also looks like the two metal pipes that lead from some part on the exhaust to the air filter housing had been cut. It was also missing the pre-heater hose from the exhaust to the air filter housing. As I said when I drove it home, it was fine with the exception of needing the gas feathered when starting from a stop or it felt like it might die. Anyway, I tried to use some carb cleaner and a toothbrush to clean the choke valve up top and I think it got misaligned or off track somehow, because that's when my high idle issues started (like 2k RPMs at idle). So I tried to fix the choke valve and must have corrected it somewhat because the idle went down to about 1200 RPMs. I then backed the throttle screw out a few turns or more, but it's still probably 800-900RPM. It seems like it won't go any lower no matter how far I continue to back that screw out. So as a result, even at idle, with the foot off the gas, I'm still cruising at 15-20 MPH. I'm suspecting a return spring might be stuck somewhere or possibly the throttle cable, since the gas pedal feels "soft" (doesn't have a lot of resistance). Just last night I replaced the plugs, all wires, distributor cap and rotor (routed correctly and double checked) and buttoned everything back up just as I got it before, although I did replace the pre-heater hose. It was back to its previous high of about 2k RPMs and I'm absolutely puzzled. I tried turning the idle screw counterclockwise to absolutely zero effect - in fact, I backed it out so much it came out and I had to put it back in! At this time the screw that comes in contact with the dashpot has been backed off so that it is close but does not make contact. I'm not sure how to check the mechanism that controls the fast idle speed in park or neutral because the Haynes manual that came with the 720 is about as useful as a sack full of butt cheeks. I hate to be "that guy" who pops on right away with an issue, but I really need any help you can provide. I'm reaching the end of my rope. Thanks in advance, everyone!
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