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  1. jons999

    Accelerated Ring Wear

    The bulletins usually don't provide too much detailed information beyond a basic cause and the updated parts or repair procedure. Maybe the catalyst pieces are being pulled into the engine through the EGR system?? I know that exhaust system leaks a few inches downstream of an oxygen sensor can...
  2. jons999

    02 sensor wire material

    Heat shrink butt connectors work fine, in fact some of the "universal fit" o2 sensors you buy from auto parts stores come with them. Although it is not the best connection we could possibly make it seems to work fine. I have done it many, many times with no issues however i always like to use...
  3. jons999

    Accelerated Ring Wear

    ...03V-084 APPLIED VEHICLES: 2002-03 Altima (L31), with QR25DE Engine 2002-04 Sentra (B15), with QR25DE Engine APPLIED VINS: Altima: 1N4AL11**2C100000 - 294952 1N4AL11**2C700001 - 719020 1N4AL11**3C100003 - 311983 Sentra: 3N1AB51**2L700019 - 730181 3N1AB51**3L716572 - 736783...
  4. jons999

    Accelerated Ring Wear

    Actually i have seen this a few times on Nissan 4 cylinders (QR25DE i think). The cat converter integrated into the exhaust manifold comes apart and gets pulled back into the cylinders causing oil consumption and/or engine failure. There was a Nissan TSB that covered this and possibly a warranty...
  5. jons999

    Urban Legend?

    Also wanted to mention, I see about 5-10 Priuses a week. The average customer is getting about 45mpg. I do have one "hypermiler" customer getting 78mpg from his Prius, with no modifications.
  6. jons999

    Urban Legend?

    When I went through advanced hybrid diagnosis training we were told that the purpose of the "stealth" mode switch was because houses in japan are very close together, and are not insulated as well as most American homes, therefore the switch is used to keep ICE off when pulling out of your...
  7. jons999

    Turn signal flasher doesn't indicate bulb-out

    Normally when a bulb is out the flasher cycles faster because of the increased current flow through the bimetal strip in the flasher unit. If your flasher is capable of supporting ten bulbs maybe the increased current flow isnt enough to heat that strip up faster? Thats the best i can come up...
  8. jons999

    Help With Product Reports, Tracking Vehicle Failures

    I'm trying to come up with a form to help me track problems with new vehicles. I'm not concerned with issues that are caused with customer damage, A/M accessories, etc. But i would like to track issues related to pattern failures of components, poor design, engineering issues, etc. The form...
  9. jons999

    Cutting Natural Rubber or Silicone Rubber Wiper Blade

    Last time i replaced wiper inserts i remember seeing a parting line like they were cast in a mold. They werent high quality blades though. -Jon
  10. jons999

    Brake Bias Bar for Street Car

    Use a tandem master cylinder with a Wilwood adjustable proportioning valve to control the rear brake bias. I wouldn't think that you would want or need abs in a kit car but it would be a fun project. -Jon
  11. jons999

    Why machine brake rotors?

    I have to disagree with most all of you, our shop pays the techs the same whether we replace or machine the rotors, so it is not a money maker for the shop to machine them because it takes there techs longer to machine than to replace (less productivity) and the shop doesn't make money off the...
  12. jons999

    Why machine brake rotors?

    From my experiance what would cause the pads not to last as long is the fact that after 30k miles or so of use the rotors are grooved and possibly rust pitted. If they are still smooth and in good condition there shouldnt be any premature pad wear, however the rotors should be machined to get...
  13. jons999

    What are the real efficiency losses in IC?

    Back to the cat convertor thing for a second. Many cars use something called Fuel Cut Tau which actually pulses the fuel injectors occasionally and pumps raw fuel out the exhaust during deceleration when the engine isn't firing. This fuel is used to keep the cat up to operating temperature...
  14. jons999

    Compression Ratio vs. Octane (Turbo/non-turbo)

    I don't think there is any easy answer to that question. Coolant temperature, valve and ignition timing, piston material, combustion chamber shape, even the type of spark plug used has a huge influence in the octane needed to keep an engine from detonating. I have seen guys putting 104 octane...
  15. jons999

    Can a brake rotor warp because of overtightening?

    Most brake pulsation is caused by thickness variation which is a result of adhesive friction material being unevenly deposited on the rotor. For example after hard braking if you keep the car at a complete stop with your foot on the brake a slight amount of pad material will melt onto the rotor...
  16. jons999

    Emergency or extreme braking lights

    Many luxury cars now have laser guided cruise control that will hold the distance behind a car in front of you if that car is going less than the speed your cruise control is set at. It will also decel the vehicle and apply the brakes if someone cuts you off. I don't think it will fully stop the...
  17. jons999

    Emergency or extreme braking lights

    I have seen buses here in the US, mostly in big cities, that have orange lights that illuminate under deceleration, standard red brake lights that come on during braking and flashing red lights for heavy braking. -Jon
  18. jons999

    shopping cart wheel

    It's due to the caster angle of the wheel (the reason wheels like that are called casters) If you look at it from an automobile alignment point of view a small amount of positive caster (steering axis tilted rearward) give easy steering and good directional stability. Too much positive caster...
  19. jons999

    fuel sensor

    The gas flowing through the nozzle passes by some venturi holes, the flow of gas creates venturi vacuum in a diaphram. About a 1/2 inch up from the end of the nozzle there is a small hole called a sensing port which is also connected by a tube to the diaphram. The sensing port bleeds off the...
  20. jons999

    Carbon fibre road wheels?

    The last time i researched carbon fiber wheels i learned that due to the brittleness of carbon fiber they wouldn't be very safe for street use, they tend to crack or shatter whereas a conventional wheel would bend. They may be good for a drag racing application though. -Jon

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