AfterMarketNews AfterMarketNews Auto Care Pro AutoCareCareerHub Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service Speedville

Thorough Brake Inspections Are Comeback Preventers And Profit Builders

How many times have you seen a hand-painted sign in a shop window that advertised a menu-priced brake pad replacement for “$XX.95 per axle.” Of course, a menu-priced brake replacement would be good if a simple brake pad replacement would cure all...

Read more...

Automotive Pet Peeves 2: Reader Feedback Is Overwhelming

How many auto repair pet peeves are out there? Well, enough of them that one article wouldn’t hold them all. I’ve received so many emails, texts and phone calls about my article in the February issue that I thought: why not put everyone’s pet peeve...

Read more...

Air Filter Show & Tell: Seeing Is Believing

Air filters are normal wear items that ­require regular checks and ­replacement. Their role is to trap dirt particles that can cause damage to engine cylinders, walls, pistons and piston rings. In fuel-injected vehicles, the air filter also plays...

Read more...

ZF 8-Speed Transmission Replacement

The ZF 8HP transmission made its debut in 2009, and since its introduction, has been one of the top choices for international car manufacturers. BMW, one of ZF’s largest customers, uses the 8HP across its entire product portfolio. BMWs featuring...

Read more...

Shop Folds After Shoddy Brake Work Endangers Woman

A Florida woman was thankful to walk away without injury after her vehicle’s brakes went out for the second time in as many months due to negligence on the part of her local repair shop, ABC Action News reported. Shelly Darling of Zephyr Hills, FL,...

Read more...

Air Ride Diagnostics: Reservoirs and Compressors

Just about every Asian and European luxury import nameplate manufacturer has a 7- to 10-year-old vehicle on the road with an air-ride suspension at all four corners. Chances are one of these vehicles will be coming to your shop sooner rather than later. Regardless...

Read more...

Regulators Launch Investigation Into Jeep Grand Cherokee Brake Defect

Federal regulators are investigating whether the automatic braking systems in some 2014 Jeep Grand Cherokees may be defective after receiving a number of complaints from motorists about a potentially dangerous glitch that caused their vehicles to come...

Read more...

Electronic Proportioning Valve: Doing More With Less Hardware

Anti-lock brake systems (ABS) and the HCU are replacing proportioning, combination and other valves to change the braking forces in the front and rear. This is called Electronic Brake Distribution (EBD) and it can dynamically change the proportioning...

Read more...

NHTSA’s GM Brake Line Corrosion Investigation: Reading Between the Brake Lines

There will be no recalls on some GM vehicles for brake line corrosion. Instead, we received an advisory from the National Highway and Traffic Safety Administration (NHTSA) about brake line inspection and car washes. What was not discussed was the corrosion...

Read more...

BMW Recognized for Engine-Building Excellence

BMW Group’s engine-building prowess was recognized with four wins at the latest International Engine of the Year Awards. The drive unit in the BMW i8 earned two class wins as well as being declared overall winner, with a further class win being garnered...

Read more...

Diagnostic Dilemma: The Case of the Missing Code

When doing mobile diagnostic work, no-code stalling complaints are a major part of your agenda. In most cases, the client shop is simply too busy to duplicate the failure or, in some cases, a long test drive will yield nothing in the way of useful...

Read more...

Secondary Ignition: The Art of Spark

What is a coil? From the beginning of the internal combustion engine, several different ignition systems have been used to create a high-energy spark. The most popular system, and the one that’s in use today, is a step-up coil. A coil is nothing...

Read more...
Home Features Articles Tool Tip: Intermittent Chuggle/No DTCs Set

Print Print Email Email

Models:
1995-’99 Buick Riviera
1995-2004 Buick Regal
1995-2005 Buick LeSabre, Park Avenue
1997-2005 Buick Century
1995-2001 Chevrolet Lumina
1995-2002 Chevrolet Camaro
1995-2005 Chevrolet Monte Carlo
2000-2005 Chevrolet Impala
1995-’97 Oldsmobile Cutlass Supreme, Ninety Eight
1995-’99 Oldsmobile Eighty Eight
1998-2002 Oldsmobile Intrigue
1995-2002 Pontiac Firebird
1995-2003 Pontiac Grand Prix
1995-2005 Pontiac Bonneville with 3800 V6 Engine (VIN K – RPO L36)

Condition
Some customers may comment on an intermittent chuggle or fishbite on light acceleration or at steady-state highway speeds (typically 50-65 mph) with no PCM DTCs set. This condition may lead the technician to suspect the TCC circuit or torque converter.

Cause
This condition may be caused by intermittent operation of the Throttle Position (TPS) Sensor.

Correction
In observed cases, the Tech II is not fast enough to consistently detect this condition during a snapshot. It is recommended to use a DVOM set to the min/max recording mode. Connect the DVOM at the TPS connector (positive lead to the TPS feedback signal pin and negative lead to the TPS ground pin).

Duplicate this condition by driving the vehicle. If the voltage dropout (less than 0.45V) is recorded on the DVOM, replace the TPS sensor (P/N 24504798) and re-evaluate the vehicle before continuing with other driveability or transmission diagnosis.

Courtesy of ALLDATA.

The following two tabs change content below.
TechShop Staff Writers

TechShop Staff Writers

TechShop Staff Writers

Latest posts by TechShop Staff Writers (see all)

Latest articles from our other sites:

ZF 8-Speed Transmission Replacement

The ZF 8HP transmission made its debut in 2009, and since its introduction, has been one of the top choices for international car manufacturers. BMW, one of ZF’s largest customers, uses the 8HP across...More

ACDelco Unveils Training Recognition Program For Technicians

ACDelco is rewarding technicians and aftermarket service centers for making the commitment to enhance their skills through ACDelco training. The ACDelco Technician Training Recognition Program awards technicians...More

ZF 8-Speed Transmission Replacement

The ZF 8HP transmission made its debut in 2009, and since its introduction, has been one of the top choices for international car manufacturers. BMW, one of ZF’s largest customers, uses the 8HP across...More

Shop Folds After Shoddy Brake Work Endangers Woman

A Florida woman was thankful to walk away without injury after her vehicle’s brakes went out for the second time in as many months due to negligence on the part of her local repair shop, ABC Action News...More

When is Road Force Balance Overkill?

Can road force balancing really make a difference? To answer the question of whether road force balancing is overkill, we should probably start by reviewing some basics. We balance tire/wheel assemblies...More

Telematics & Tires

Just as vehicle telematics are affecting maintenance and repair, tire telematics are becoming reality, as well. Though several tiremakers may be working on “smart” tires or TPMS developments, Continental...More

Chicago Auto Show Display Takes 1.0L EcoBoost Apart

One of many highlights in the Ford booth at the 107th Chicago Auto Show was a large layout of the pieces that make up the first-ever Ford three-cylinder EcoBoost engine. This 1.0 liter turbocharged, direct-injection...More

Performance V6 and Four Bangers

Any engine builder worth his or her torque wrench keeps their eyes open. They’re looking for anything and everything to make work easier, better and, of course, more profitable. And just as important...More