Tech Feature: Northstar Supernova
Introduced in 1993, GM’s 4.6L 32-valve dual overhead cam all-aluminum V8 engine – housed in the Cadillac Allante, Eldorado and Seville STS – was considered a quantum leap forward for U.S. automakers. Initially rated at 295 horsepower, the Northstar V8 has grown over the years to an incredible 469 hp at 6,400 rpm (STS-V Supercharged Northstar engine).
Mitch Schneider: How to Pass the ‘Reasonable Man’ Test
We’ve been doing a fair amount of restoration work lately. Certainly, more than we’ve done in a very long time: a 1962 red Corvette convertible (Like there is another color…), a number of vintage ’50s and ’60s Cadillac Coupes and Sedan De Villes, a few early ’50s Roadmasters, a couple of classic ’60s Mustangs, a 1931 Oldsmobile (I know…How did that one sneak in there?) and more.
Tech Tip: Multiple Cylinder Misfire or Rough Idle on Chrysler Models
This bulletin involves rotating all engine exhaust valves, replacing the valve spring retainer locks with a new design to increase valve rotation at lower rpm, inspecting/replacing the MAP sensor (as necessary), and decarbonizing the combustion
Tech Tip: Hyundai Sonata Runs/Idles Rough/ DTC P0335 Set/MIL ON
This TSB has been revised to add a procedure to index the oil pump/balance shaft sprocket. Not properly indexing the sprocket may cause an engine vibration mostly noticed at 3,500-4,000 rpm.
When Parts Collide: Volkswagen and Audi Engine Repairs
In the early 1970s, VW/Audi designed a small, efficient and reliable engine that was easy to work on and made use of the then fairly new technology of a rubber timing belt without the possibility of damage if it failed. This two-valve-per-cylinder engine produced excellent power and economy, and really set the standard that many other manufacturers couldn’t match.
Tech Tip: An Economical And Effective Way To Refinish A Seal-Worn Shaft
Grooves from shaft wear can allow oil to leak out, which can result in bearing damage and failure.
Tech Feature: Servicing Ford’s 3.0L Engine
The 3.0L Duratec V6 was introduced in 1996 to replace the aging 3.8L V6 in the Ford Taurus and Mercury Sable. Unlike its conventional pushrod predecessor, the 3.0L V6 has dual overhead cams, four valves per cylinder and an aluminum block with cast-iron cylinder liners.
Nissan Tech Tip: DTC for Variable Valve Timing Control Function
On any 1996-2009 vehicle with variable valve timing, if the MIL is on with any of the following DTCs stored: P0011, P0014, P0021, P0024, P1110 or P1135, do not replace the variable valve timing solenoid valve or the sprocket(s) without performing the complete diagnosis indicated in the EC section of the service manual.
Nissan Tech Tip: DTC For Variable Valve Timing Control Function
On any 1996-2009 vehicle with variable vale timing, if the MIL is on with any of the following DTCs stored: P0011, P0014, P0021, P0024, P1110 or P1135, do not replace the variable valve timing solenoid valve or the sprocket(s) without performing the complete diagnosis indicated in the EC section of the service manual.
Tech Tip: GM Drivers Rattled By Engine Noise
Some GM truck, SUV and minivan owners may complain about a rattle-type noise coming from the engine area at approximately 1,800 to 2,200 rpm. The rattle-type noise may be caused by torsional vibration of the balance shaft. To fix the problem, follow the service procedure below for installing a new tensioner assembly kit.
Tech Tip: Honda Engine Service Essentials
While engine-related complaints aren’t common on Honda’s line of vehicles, problems may still arise from time to time. Import Specialist Contributor Bob Dowie walks you through head gasket repair, from diagnosis to estimating the job to gasket replacement, and also discusses the intricacies of timing belt replacement ….
Gearing Up for Timing Belt and Chain Work
Timing belts are a maintenance item on engines that have them, but what about timing chains? On most overhead cam engines that use a timing chain to turn the cams, there’s usually some type of chain tensioner or adjuster to keep the chain tight and to compensate for stretch as the chain ages. But on pushrod V6 and V8 engines, there is no chain tensioner to compensate for chain stretch. Consequently, after tens of thousand of miles, the chain loosens up, starts to make noise as it rattles against the front cover, and causes cam timing to retard. At this point the timing chain needs to be replaced.