Porsche 928 problems
The Porsche 928 is a grand touring car with a 2+2 seating layout manufactured by Porsche AG of Germany from 1978 to 1995. Initially conceived to address changes in the automotive market, it represented Porsche's first fully in-house design for a production vehicle and was intended to potentially replace the Porsche 911 as the company's flagship model. The 928 aimed to blend the performance and handling characteristics of a sports car with the comfort, spaciousness, and ride quality of a luxury car. Porsche executives believed that the 928 would have broader appeal compared to the compact, somewhat outdated, and slow-selling air-cooled 911. Notably, it was Porsche's inaugural production model powered by a V8 engine located at the front, and it achieved remarkable top speeds, earning recognition upon its 1978 release by winning the European Car of the Year award. The Autocar described it as a "super car" in 1980.
Conception
In the late 1960s, Porsche had solidified its reputation as a manufacturer of high-performance sports cars. Amidst the 1970s oil crisis, there were discussions among executives, including owner Ferdinand Porsche, regarding the potential addition of a more fuel-efficient luxury touring car to the company's lineup. Managing director Ernst Fuhrmann advocated for the development of this new model, expressing concerns about the 911, Porsche's flagship model at the time, nearing its performance limits. Fuhrmann believed that expanding into grand touring cars with conventional engines could be essential for the company's future, contrasting with the unconventional sports cars like the 911. The declining sales of the 911 in the mid-1970s suggested a possible downturn in its market appeal. Fuhrmann envisioned the new range-topping grand tourer as a blend of sports coupé and luxury sedan, distinguishing it from the 911 with its more utilitarian interior and pure sports car performance. In the view to please the very important USA market, it switched to front-engined, V8 power and a more spacious interior that included two real child seats (rather than the dog seats in the 911). The goal was to create a model that could compete with offerings from Mercedes-Benz and BMW while also appealing to the American market, which was Porsche's primary market at the time.
Ordered by Ferdinand Porsche to develop a production-feasible concept for the new model, Fuhrmann commenced a design study in 1971, resulting in the creation of the 928. This model marked Porsche's first clean-sheet design for its own model. Previous Porsche models had been iterations or collaborations: the 356 bore similarities to the Volkswagen Beetle, the 911 evolved from the 356, the 914 was a joint venture aimed at replacing the Volkswagen Karmann Ghia and 912, and the 924 stemmed from a discontinued Volkswagen and Audi project.
Various drivetrain layouts were considered during early development, including rear- and mid-engine configurations, but many were dismissed due to technical and regulatory challenges. Issues with emissions and noise control, similar to those experienced with the 911, arose from cramming the engine, transmission, catalytic converter(s), and exhaust into a small rear engine bay. After determining that the mid-engine layout lacked sufficient space in the passenger compartment, Porsche opted for a front-engine, rear-wheel drive configuration.
Porsche engineers sought a large-displacement engine for the 928, and prototype units were initially equipped with a 5-liter V8 engine producing 300 PS (220 kW; 300 hp). There were discussions about utilizing a 4.6-liter 90-degree V10 engine with 88 mm bore spacing, which was a derivative of the Audi 5-cylinder engine (also used in the Lamborghini Gallardo) and based on the Volkswagen EA827 unit. However, this proposal faced objections from the Porsche board due to concerns that it might lead to rumors of a new 911 model with a front-mounted Volkswagen-based engine. Additionally, it is speculated that the board aimed to maintain some separation from the Volkswagen Group.
The resulting all-alloy M28 engine incorporated several distinctive features. Its bore spacing was 122 mm, indicating the use of thick, all-aluminum cylinder barrels without steel liners. The water jackets were notably large, hinting at the engine's potential for racing applications. To maintain a low hood line, the engine prioritized airflow, resulting in the placement of spark plugs at the top of the head. The four-bolt bearings were substantial and received oil via grooves in the block's bottom surface. They were supported by a large one-piece structure forming a lower block, with the cast aluminum oil pan bolted onto this component.
The oil and water pumps were driven by a timing belt. In 1985, DOHC engines introduced a hybrid timing system where the timing belt operated only the exhaust camshafts, while the intake camshafts were driven via an internally-mounted simplex roller chain from the exhaust camshaft. This approach simplified the timing belt layout, requiring fewer components and leading to easier and less costly maintenance. This timing system was later adopted by Porsche 944 and also by Audi and Volkswagen in their belt-driven DOHC engines.
The first two running prototypes of Porsche's M28 V8 initially utilized a single four-barrel carburetor for initial testing. However, the production cars ultimately employed the planned Bosch K-Jetronic fuel injection system. As concerns over fuel prices and availability during the 1970s oil crisis grew within the company, discussions emerged regarding the feasibility of smaller engines to improve fuel economy. There was a proposal for the development of a 3.3 L 182 PS (134 kW; 180 hp) powerplant, suggested by Fuhrmann, but this was met with resistance from company engineers. Eventually, both sides reached a consensus on a 4.5 L, SOHC per bank 16-valve V8 engine producing 240 PS (180 kW; 240 hp) (219 hp (163 kW) in North America). This engine was considered to strike an acceptable balance between performance and fuel efficiency.
By 1973, essential development was finished and a prototype was built and under testing. At this moment, Arab-Israeli war broke out and brought the threat of energy crisis. Sales of large and thirsty cars plunged. It was a big hit to both 928 and Porsche. The project was put into low gear and production postponed until 1977.
The finished car made its debut at the 1977 Geneva Motor Show and was subsequently released for sale later that year as a 1978 model. Despite earning early acclaim for its comfort, power, and futuristic design, sales were initially sluggish. The base prices of the 928 were considerably higher than the previous range-topping 911 model, and the shift to a front-engined, water-cooled design unsettled some traditional Porsche enthusiasts.
Following the departure of Fuhrmann, Peter Schutz, his successor, opted to continue selling both models concurrently, believing that the 911 still had a place in the company's lineup. However, legislative restrictions against rear-engined vehicles never materialized. Although the 928 didn't achieve the sales targets envisioned by Fuhrmann, it garnered a devoted following and enjoyed an 18-year production run.
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Porsche 928 model years
Common Porsche 928 problems
The Porsche 928, a grand tourer produced between 1977 and 1995, is known for its unique design and advanced engineering. However, like any car, it has its share of common issues that owners have reported.
One of the most common problems with the Porsche 928 is the failure of the engine thrust bearing in automatic transmission equipped cars. This issue is attributed to the driveshaft exerting excessive pressure on the flywheel and drive plate, which eventually wears away the thrust bearings in the engine. If left unchecked, the wear can progress to the point where the crankshaft wears into the internal casings of the engine, causing catastrophic damage. To prevent this, it is recommended to replace the thrust bearings before the crank wears into the block.
Electrical gremlins are also prevalent in the Porsche 928. These issues can manifest as intermittent hard starts, rough idle, poor performance, and bad gauge readings. They are often caused by corrosion in sensor connectors, ground points, and ground straps. Regular inspection, cleaning, and replacement of these components can help avoid electrical issues.
Timing belts and water pumps in the Porsche 928 are known to last around 50,000 miles but should be replaced no later than that point. Failure of the timing belt can cause serious engine damage, especially in post-1985 models with 32 valve interference engines. The engine valves themselves will bend if a timing belt slips or breaks, potentially leading to costly repairs.
The V8 engine in the Porsche 928 uses a rubber timing belt rather than a chain, which becomes more brittle and susceptible to breakage as it ages. It is recommended to replace the timing belt every 60,000 miles or every five to seven years, whichever comes first. Failure to do so can result in mechanical engine damage, typically pistons hitting open valves.
The 928's air conditioning system may also present issues due to the use of the outlawed R12 refrigerant. Upgrading the system to accept R134a refrigerant can be costly, and many cars from this period have non-operable HVAC systems as a result.
Power steering leaks are another common problem in the Porsche 928, particularly in the power steering racks and hoses. While leaks in the hoses can be addressed with relatively inexpensive parts and labor, replacing the rack is a more involved job.
Rust is not a common issue in the 928 due to its extensive use of aluminum and galvanized steel. However, paint issues are expected to be age-related, with proper care, factory paint should last decades.
In summary, the Porsche 928, while a groundbreaking and advanced vehicle, is not without its common issues. Regular maintenance, including timely replacement of the timing belt and addressing electrical gremlins, can help ensure the longevity and reliability of this iconic grand tourer.
How reliable are Porsche 928s?
If properly maintained by someone who understood the car, second-hand 928s should have no significant issues. Many reliability complaints about the 928 were brought on by well-meaning but ignorant technicians.
Why did the Porsche 928 fail?
Despite earning early acclaim for its comfort, power, and futuristic design, sales were initially sluggish. The base prices of the 928 were considerably higher than the previous range-topping 911 model, and the shift to a front-engined, water-cooled design unsettled some traditional Porsche enthusiasts.
How expensive is it to maintain a Porsche 928?
The annual maintenance cost of a Porsche 928 is $765.
Does Porsche 928 have timing belt or chain?
timing belt
The Porsche 928's V8 engine, renowned for its power and efficiency, relies heavily on the timing belt to maintain its precise mechanical rhythm.
Percentage distribution of complaints by Porsche 928 years
We have researched Porsche problems and analysed all the complaints filed against Porsche 928 cars and compiled the top 4 most problematic Porsche 928 model years:
Below you can see the percentage distribution of known problems by Porsche 928 model years.
Distribution of the number of complaints by Porsche 928 years
We've also compiled a chart for you with the number of complaints about Volkswagen Jetta cars of certain model years:
Porsche 928 car problems categorized by type of issue
After analysing all complaints related to Porsche 928 , it was concluded that the most common issues with these cars are:
- Engine and engine cooling problems
- Electrical system problems
- Power train problems
The graph below shows statistics for all Porsche 928 vehicle components and the number of complaints received.
Distribution of the number of complaints with fire by 928 model years
There were a total of 2 complaints that resulted in a fire. In the graph you can see the distribution of the number of complaints by model year.
The NHTSA has received 4 complaints about various vehicle components related to the Porsche 928 . Below are the 25 most recent complaints reported for Porsche 928 vehicles.
List of Porsche 928 complaints
Porsche 928 1981
- Date Of Incident: 2000-06-01
- Date Complaint: 2001-01-24
- Fire: 1
- VIN: WPOJA0925BS
- Components: ELECTRICAL SYSTEM
- Summary: CONSUMER PURCHASED POWER FORCE BATTERY MAY 2000, IN JUNE THE BATTERY EXPLODED CAUSING DAMAGE TO THE ELECTRICAL SYSTEM, CONSUMER REQUEST REIMBURSEMENT FOR DAMAGES BUT WAS DENIED. NLM
Porsche 928 1993
- Date Of Incident: 1998-12-01
- Date Complaint: 1999-05-30
- Components: ENGINE AND ENGINE COOLING
- Summary: MAJOR ENGINE DAMAGE, ENGINE HAD TO BE REPLACED. TWO CYLINDERS BROKEN. DETECTED CAUSE FOR THE ENGINE FAILURE: BAD ASSEMBLY OF THE WATER PUMP WHEN CAR WAS MANUFACTURED IN 1993. EFECT OF THIS BAD WATER PUMP ASSEMBLY WAS A CONSTANT OVERHEATING OF THE ENGINE WHICH FINALLY LED TO A COMPLETE ENGINE FAILURE DUE TO CONSTANT OVERHEATING (NOT SHOWN ON THE CONTROL PANELS). *AK
Porsche 928 1984
- Date Of Incident: 1995-01-01
- Date Complaint: 1996-08-14
- Components: POWER TRAIN
- Summary: SPEEDOMETER FAILURE. *AK
Porsche 928 1987
- Date Of Incident: 1994-07-25
- Date Complaint: 1994-10-10
- Fire: 1
- VIN: WP0JB0929HS
- Components: ENGINE AND ENGINE COOLING
- Summary: CATALYTIC CONVERTER OVERHEATED/HEAT SHIELD FAILED T0 PROVIDE ADEQUATE PROTECTION TO ENGINE FROM HEAT, RESULTING IN A FIRE PRIOR TO RECALL (89V-106). *AK
Recalls Porsche 928
The National Highway Traffic Safety Administration (NHTSA) has issued 3 recalls for different components of the Porsche 928.You can explore the year of the Volkswagen Jetta you are interested in by selecting it from the list.
- Model: Porsche 928 1987
- Report Received Date: 1989-06-28
- Manufacturer: PORSCHE CARS N.A. INC.
- Components: ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:CATALYTIC CONVERTOR
- Summary: INADEQUATE HEAT SHIELD ABOVE CATALYTIC CONVERTER COULD OVERHEAT.
- Consequence: MATERIALS NEAR CATALYTIC CONVERTER, INCLUDING LINES FORAUTOMATIC TRANSMISSION FLUID, COULD IGNITE AND CAUSE AN UNDERBODY FIRE.
- Remedy: REPLACE HEAT SHIELD FOR CATALYTIC CONVERTER WITH A LARGER, IMPROVED HEAT SHIELD.
- Model: Porsche 928 1987
- Report Received Date: 1987-03-12
- Manufacturer: PORSCHE CARS N.A. INC.
- Components: FUEL SYSTEM, GASOLINE:DELIVERY:HOSES, LINES/PIPING, AND FITTINGS
- Summary: RETURN FUEL LINE HOSE MAY NOT BE OZONE RESISTANT.
- Consequence: FUEL HOSE COULD CRACK, RESULTING IN A FUEL LEAK ANDENGINE COMPARTMENT FIRE.
- Remedy: INSTALL A NEW HOSE WHICH IS OZONE RESISTANT.
- Model: Porsche 928 1981
- Report Received Date: 1981-03-25
- Manufacturer: PORSCHE CARS N.A. INC.
- Components: SUSPENSION:FRONT:SHOCK ABSORBER
- Summary: FRONT SHOCK ABSORBERS ON SOME VEHICLES MAY HAVE IMPROPERLY WELDED MOUNTING EYES. THE SHOCK ABSORBER MOUNTING COULD SEPARATE AND CAUSE THE SUSPENSION TO COLLAPSE IF VEHICLE IS DRIVEN ON ROUGH ROADS FOR A LONG PERIOD OF TIME.
- Remedy: THE FRONT SHOCK ABSORBERS ON ALL INVOLVED VEHICLES WILL BE CHECKED AND, IF NECESSARY, REPLACED WITHOUT CHARGE.
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