Tech Tip: Curing Engine Rattle on Chevy Astro Vans
Some customers with the vehicles mentioned in this Tech Tip may comment on a rattle-type noise coming from the engine at approximately 1,800 to 2,200 rpm. The spark, rattle-type noise may be caused by torsional vibration of the balance shaft. If detonation noise is present, perform detonation/spark knock diagnostics first.
Wheel Speed Sensors Replacement: WSS, Chevy, GM
By Larry Carley, Technical Editor When engineers came up with the idea of putting the wheel speed sensor (WSS) and tone ring inside a sealed wheel bearing hub assembly, it seemed like a great idea. The sealed environment would help protect the sensor and make it less vulnerable to damage or contamination from the outside
Chevy Silverado Tech Tip: ABS Light Comes on at 40-50 mph
At speeds over 40-50 mph, the ABS and brake indicators come on, and the fuel and volt gauges sometimes drop low at the same time. The technician had already verified the condition and checked for codes before calling Identifix. He found code C0237 (rear wheel speed signal erratic) stored as a history code, but it had not reappeared for him.
Tech Tip: Boom-Type Noise During Engine Warm-Up on Chevy Astro Vans
Some customers may comment on a boom-type noise heard in the vehicle passenger compartment during engine warm-up. To correct this, install an exhaust dampener assembly on affected vehicles. Use the following procedure and the part numbers listed in this Tech Tip.
GMC/Chevy Light Truck: Central Port Fuel Injection Diagnosis
Back in 1992, General Motors introduced a new type of fuel injection system known as “Central Port Injection” (CPI), which GM also refers to as “Central Multi-point Fuel Injection” (CMFI). The system was used on 4.3L V6 Vortec engines through 1995, and was redesigned in 1996 and renamed “Central Sequential Fuel Injection” (CSFI). The system
Tech Tip: Boom-Type Noise During Engine Warm-Up on Chevy Astro Vans
Some customers may comment on a boom-type noise heard in the vehicle passenger compartment during engine warm-up. Install an exhaust dampener assembly on affected vehicles using the following service procedure.
Tech Tip: Chevy Blazer’s Engine May Rattle Between 1,800 and 2,200 rpm
Some customers may comment on a rattle-type noise coming from the engine at approximately 1,800 to 2,200 rpm. The spark, rattle-type noise may be caused by torsional vibration of the balance shaft. If detonation noise is present, perform detonation/spark knock diagnostics first.
Chevy AVEO Timing Belt Service
As a rule, General Motors uses timing chains rather than timing belts on most of its engines. Timing chains are long-lived and reliable, and do not have a recommended replacement interval. Not so with timing belts. One GM engine that does use a rubber timing belt is the 1.6L E-TECH II engine in the 2004
Holley Street Dominator Small Block Chevy Intake Manifold is Available with Everbright Finish
Holley recently announced the availability of their Everbright finished Street Dominator Intake Manifold for small block Chevy engines, PN 300-36C. The Everbright finish has the look of polished aluminum and the durability of powder coating.
TechTalk: A Chevy Tahoe with Shifting Issues
A customer with a 1996 Chevy Tahoe brought the vehicle in, stating that it was shifting erratically, the cruise control would surge from 50 mph to 60 mph and then cut out completely and the speedometer, at times, was drifting. (This Tahoe had a 5.7L vin R engine with a 4L60E transmission coupled to a