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TECH TIP SEARCH RESULTS
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Chevy Lumina air bag problems
Their bag problems have led to a recall for the 2000 Chevy Lumina and the Pontiac Grand Prix built from September through October 1999. If you have a vehicle built during this period, contact Chevy at (800) 222-1020 or Pontiac at (800) 762-2737 immediately. The build date can usually be found on the driver’s-side door or pillar
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Clean Carbon Build-up from Engine
The best way to clean carbon build-up out of your engine is NOT to take the car out and run it as hard as you can. This only results in meetings with local law enforcement personnel, and doesn't do much for cleaning out carbon.
If you really want to clean the carbon out of your engine follow these simple steps. Fill an empty soda bottle with water. Remove your air cleaner. Start your engine. While using one hand to control the throttle, trickle the water into the carb or throttle body with the other while holding your thumb over the bottle opening. Keep the engine rpm's up so that the engine doesn't die. Make sure that you don't pour the water in too fast! Water doesn't compress and if you pour too much water in, severe engine damage can result! White smoke from the exhaust is normal. If you have a port fuel injected car, you obviously won't be able to use this method, but I have had success with connecting a vacuum hose to a port at the base of the throttle body and sticking the other end of the hose into the bottle of water. The vacuum of the engine will suck the water in, creating the same effect. This will clean out even the most stubborn carbon, by 'steam cleaning' your cylinders.
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Ford F-350 Truck Wiper Problem
The intermittent wiper might not work because of a faulty wiper motor. The problem that Ford has been having is that wiper motor circuit board has been failing, leading to occasional or total non-operation. Check with Ford if your truck has this problem.
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How to Change BMW Battery?
Once you are sure you need to replace your battery you can either pay someone else to do it for you, or do it yourself.
If you decide to save money on labor, first thing you need to do is get the right battery. It's easy, just ask the parts seller to look up the correct application. Make sure you are getting the same amp battery as listed for your car.
Exchange procedure is quite simple and takes about ten minutes. You will need a crescent wrench and a screwdriver.
Begin with loosening the casble clamps attached to the battery terminals. Remove the negative battery cable FIRST, and reconnect it LAST. Then unscrew the hold-down brace which keeps battery in place. Take out old battery and place a new one instead, reversing the whole procedure.
That's it! Your done!
Before closing the hood of your new battery, make sure all cables and terminal ends are clean and not cracked. This will assure positive connection.
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Noisy Brakes
A grinding noise coming from your brakes could be an indication that you may have brake trouble. Most disc brakes installed on vehicles have a wear sensor installed on them. When brake pads get low the sensor will hit the rotor, this warning system emits a growling or scrapping noise to remind you to have the brakes checked or replaced. In order to prevent any damage to the rotor surface or caliper you should have your brakes looked at by a mechanic immediately. Don't forget it's the most important system on your vehicle.
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Transmission Problems in Chrysler LHS
Transmission problems may be caused by a faulty thermostat in the 3.5L engine. Engine temperature is controlled by the thermostat, which is in turn monitored by the vehicle’s computer system. An incorrect signal can be sent by the cooling system, causing transmission commands to lock up. This can result in a bucking or surging problem. The thermostat should be checked for proper operation and the coolant should be kept at proper level. Always use caution when working around a hot engine.
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Vacuum Hose Problems
Inspect those vacuum hoses. They either become misrouted, or they deteriorate and collapse. We had a Dodge Colt Vist (Mitsubishi) that would go lean at highway speeds. Went through everything, until we checked vacuum line routing. The lines going to the High Altitude Compensator (opened a vacuum port in the main jet that reduced the fuel by breaking the siphon) were reversed, so the engine ran out of fuel. Have seen lots of misrouted lines causing similar problems, so get out the charts. Check it out yourself. Check the condition for all the vacuum lines to prevent pinhole leaks from driving you crazy.
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Vehicle With a 'Questionable' Maintenance Record
If you purchase a used car with a 'questionable' maintenance record, it's a good idea to add automatic transmission fluid to the crankcase and run the engine for a few minutes before changing the oil. This will clean out a good portion of the sludge and build-up from the inside of the engine.
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Volvo 240 No-start
The Volvo 240 might not start because of a clogged flame trap. The flame trap is the positive crankcase ventilation system that allows blow-by gases from the engine to be introduced into the intake system. This system vents the gas to prevent engine seal leaks and lowers emissions. Difficult starting can be accompanied by a MIL (check engine light) with an oxygen sensor code. The code is set to the clogged flame arrester problem. Check the flame trap screen for clogging and replace as necessary.
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Why Engine Thrust Bearings Fail
Often, soon after an engine rebuild, premature engine thrust bearing failure occurs. We will discuss some of the major causes of these types of failures.
One of the most common causes of thrust bearing failures is the transmission torque convertor. When the overrunning clutch in a torque convertor becomes either seized or will not lock up in one direction, the stator does not provide it's normal function of directing the transmission fluid to create the proper torque multiplication required to drive the vehicle. When this happens, a large amount of the energy created is exhausted through the center of the torque convertor, creating excessive forward pressure. It is this pressure which causes the engine thrust bearing damage. When installing a new engine, it is wise to check the convertor your self, or have a qualified transmission rebuilder inspect it for over running clutch problems.
Improper installation of the torque convertor in the transmission front pump can also lead to bearing failure, as well as transmission failure.
Vehicles with standard transmissions may also experience this type of engine failure due to high clutch pressures, usually related to performance clutches with high spring pressures being installed. Riding the clutch can also cause thrust bearing failure on new engines. You must also ensure the clutch has adequate free play.
Symptoms of damage caused by excessive external pressure on the crankshaft vary on engines due to their design differences.
Small block Chev engines usually suffer catastrophic damage from excessive external pressures. In most cases the thrust bearing show signs of heavy rubbing on the thrust bearing. The most severe damage it on the other mains bearings, with the highest wear being on the center bearing, usually concentrated on the lower half of the bearing. The intermediate main bearings will have about half the wear of the center bearing, with the front and rear bearing showing little sign of problem.
Big block Chev engines, due to the rigidity of their crankshaft, will usually only destroy the thrust face of the thrust bearing, causing little damage to the other mains.
Engines with a center thrust bearing usually, as well as rubbing the thrust surface, will show signs of wear on the opposite sides of the crankshaft on the two intermediate bearings.
I have seen cases of thust bearing failure on small block Ford engines that do not seem have an apparant cause. Upon checking the inner part of the bearing that seats in the block, signs of scraping on the bearing were noticed. This is the result of the installer trying to install the bearing in the rear location instead of the center, where the thrust bearing is located in this type of engine.
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Why Oil Pumps Fail?
Tight tolerances make for a precarious existence for this critical component.
Oil pumps don't always need to be replaced when oil pressure drops, but when one does need to be replaced, it is important to know the ins and outs of oil pump failure.
By far the most common reason for an oil pump to fail is from dirt or debris in the lubrication system.
According to some data, prime culprits include wire bristles from cleaning brushes, valve seal material, and other assorted dirt. When one considers that oil pump clearances are in the order of .003", it is not hard to understand why foreign material can cause oil pump failure.
Pieces of nylon cam drive gears have also ended up in oil pumps. Don't expect the screen to filter out these objects as most have a bypass hole or slots designed to allow oil to flow when the oil's viscosity is too high to flow effectively through the screen. A cold start and a piece of debris can quickly lead to oil pump lock-up.
So, whenever an oil pump is being replaced, jobbers should advise their customers that oil systems should be flushed out thoroughly. Debris can also end up in the pressure relief valve, possibly causing pressure to bleed off leading to a low oil pressure situation, perhaps ending up in engine damage.
In addition, manufacturers have reported that there appears to be an increase in post rebuild engine failures as a result of the oiling system failing to prime itself. Reports from warranty claims have revealed completely dry oil pumps in some cases. To avoid this, jobbers should advise all customer to immerse pumps in oil and hand prime the oil pump before installation. Furthermore, it is not advisable to use petroleum jelly, lithium grease lubricants as a prelube in the oil pump, or liberally in the engine at all as they do not pump and can fill the pumping channels, curtailing is ability to move oil.
For engines that are already assembled, but have been shipped or left sitting in storage, it is particularly advisable to pressurize the entire oiling system prior to start up using an electric drill as the oil pump may not be able to pressurize the system quickly enough to prevent damage. This procedure should be performed on any engine that has been assembled, before start up, to prevent dry start.
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