Q: My wife’s 2004 Lexus GX 470 with 136,000 miles recently was at our local garage for the state safety inspection. They stated that it will need new rear shocks for the next inspection (one year from now) because they are starting to leak. The estimated cost is $750 each to replace. I figure the cost is that high because of the “electronic modulated suspension.” I was wondering if there is an alternative shock that can be installed at a much lower cost. Our mechanic stated no. I do trust him, because we have used this garage for the past nine years. Your thoughts?
— N.P., Bethlehem, Pa.
A: You can’t change the electronic ride control system with cheapo shocks. However, we suggest you keep an eye on your current components.
A bit of oil weeping is normal, but if the entire outside is wet with oil, replacement is in order.
Q: Where do I find these “unscrupulous” scrap dealers that are willing to pay $100 each for catalytic converters? I have two almost new universal units from a 1975 ‘Vette show car with side pipes! The “scrupulous” scrap dealers I’ve taken them to only offer $5 apiece!
— M.V., Schaumburg, Ill.
A: None of the scrap dealers we contacted would offer to pay a high price. In fact, some refused to even accept catalytic converters. You may have to contact your local thief.
Q: Two people I know have been quoted rather high prices to have the throttle body and/or fuel injectors cleaned. Both have 8- to 10-year-old Ford autos. Is this cleaning necessary? What is the best way to keep these two things clean to avoid this expense?
— J.W., Chicago
A: Fuel injectors and throttle bodies can get gummed up and suffer a buildup of varnish. As this occurs, fuel economy and drivability may suffer. To keep the problem at bay, use quality fuels with plenty of detergent additives and occasionally pour a fuel system cleaner additive in the tank.
Q: My daughter owns a 2011 Volkswagen Tiguan with the four-cylinder turbo, and twice now the coil pack on the engine has been replaced. The car goes like it is in limp mode, and she then has it towed. The dealer replaced one coil pack each time and has no answer as to why it failed. It seems all they can do is look at the computer printout and fix the problem.
— R.B., Orland Park, Ill.
A: From your message, it seems that the dealer is replacing one coil at a time. Like many engines, this one has an ignition coil on each spark plug. This is called coil-on-plug. If one fails, the engine runs poorly. If only one is replaced, instead of all four (a whole pack), another may soon fail.