Some 2001 and later S60, S80, C70, V70 and V70XC cars, as well as 2002 and later XC70 and XC90 models (all with Bosch engine management systems) may lack power when accelerating.
According to Volvo, the problem may be accompanied by a knock or rattle from the engine, an illuminated Check Engine light and trouble codes 640A, 640F, 641A, 641F, 643A or 644A logged in PCM memory. A sticking VVT solenoid plunger is the likely cause.
Giving the solenoid a good cleanup should bring back the power to the Swedish vehicles.
Start the fix by removing the VVT solenoid from its housing on the valve cover. Using the illustration above as a reference, disassemble the solenoid by removing the snap ring, washer, spring and plunger.
Clean all the parts with carburetor cleaner, then squirt some of the cleaner into the solenoid bore. Next, blow dry all the parts with compressed air, lube them up with oil and reassemble the solenoid.
Now install the solenoid to the housing and reattach the assembly to the valve cover using a new gasket, part #1275569. To complete the fix, clear the trouble codes and test drive the vehicle to verify that the power is restored.
Some 2003-06 Dodge Ram pickup trucks with diesel engines may produce a loud chirp from underhood just as the engine is shut down.
Chrysler said one likely source of the noise is the accessory drive belt slipping on the alternator pulley as the engine comes abruptly to a halt. Replacing the original alternator pulley with a redesigned unit equipped with an overrunning clutch, part #05183490AA, should eliminate the noise immediately.
Some 2005-06 5.7-liter Jeep Grand Cherokees and 2006 3.0-liter Jeep Commanders built prior to Oct. 29, 2005, may produce a whining sound from the power steering system on first startup in the morning.
According to Chrysler, the noise is most apparent when temperatures are below freezing, increases in intensity the colder the temperature gets and usually dissipates fairly quickly as the engine warms.
Insufficient fluid flow through the power steering system is the most likely cause of the whining sound. Installing a new-design power steering reservoir, part #52124317AA, should eliminate the noise immediately.
Be aware that the new reservoir looks identical to the old one on the outside, but has internal design changes that promote better fluid flow through the system in colder temperatures.
Owners of 2003-04 Buick Centurys and Regals, Chevy Impalas and Monte Carlos and 2004 Pontiac Grand Prix models may come into your store complaining of a clunk or bang from the rear during braking or while performing parking maneuvers.
According to GM, the noise is most obvious when the fuel level in the tank is between one-half and full, and is caused by gasoline sloshing against the sides of the tank during the operating conditions noted. Installing a new-design fuel tank with special internal baffles, part #15141578, is the only sure-fire fix.
After installing the new fuel tank, you'll have to have the PCM reprogrammed with updated software due to the different design characteristics of the tank's evaporative emissions system.
Check with a dealer for the specifics of the new calibration.
Drivers of 2005 Sorento models with electronic power steering systems may complain of intermittent hard steering during parking or while driving.
Kia said the problem is limited to vehicles built prior to Oct. 6, 2004, and is likely due to an intermittent signal from the vehicle speed sensor (VSS).
Installing a new-design VSS, part #96420 4A600, along with an extension harness, part #91400 3E999, should eliminate further steering issues. After installation of the new parts, make sure the extension harness is secured with a tie strap to prevent vibration and interference with moving parts.
Owners of 2007 RX 350 SUVs may come up to your write-up desk with a complaint that the a/c light blinks continuously and/or that a “Check A/C System” message is displayed on the driver information panel.
Lexus attributes both problems to internal defects in the a/c amplifier.
Installing a modified amplifier, part #88650-0E021, should eliminate further trouble.
“Factory Fixes” is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].