Dec 212018

Is the replacement of the drive belt idler pulley on 1994 Volvo 960 L2.9 a do-or-yourself job? I have a belt detentioner and basic mechanical skills. The pulley seems accessible on front of block. Single bolt. Any pitfalls?

Serpentine Drive Belt, Replace

1. Rotate or lift the belt tensioner arm, using a suitable tool to relieve tension from drive belt.
2. Remove the drive belt.
3. Clean pulleys and inspect for any bent or damaged pulleys.
4. Reverse procedure to install.
Dec 212018

Roof stopped closing in middle of the operation. I had to use the manual lever to close but doesn’t lock into place. How can this be reset so the roof can be locked in again? Cheers

You will need to make the needed repairs in order for the sun roof to function properly.

Sun Roof Troubleshooting

Check voltage supply to fuse#9 and replace as needed. Ensure voltage is present at the sun roof switch terminal #10(Red Wire). Ensure voltage supply to stepping relay, motor, and microswitch is present at switch terminals #3(Yellow Wire) and #4(Blue Wire) by setting switch in different positions. Check all connections, wiring and grounds.

Dec 212018

Reverse gear is very very slow to engage when the GB is cold drive 100 meters about 30 ft and it will engage, but leave it standing it soon goes back to being difficult to engage. This has been a problem for seven years. I very recently changed the oil and filter, the oil pan was clean with no swarf on the magnet. All gears shift smoothly with no slip

Dec 202018

Fuel pump diagram 1993 Dodge W150

I just bought this truck and it needed a fuel pump. The fuel pump was replaced with the wrong fuel pump before. I ordered a new fuel pump, but it is quite different. It has an return and outlet line. The truck only has an outlet line and one that is very small that I was told was a vent. The old pump had a component that didn’t come with the new pump that had to be moved to the new pump. Not sure what it is, but the small line on the truck fits it and that is where it was on the old pump. I connected it up and of course had no line to go on the return on the new pump and the truck is running. I’m afraid to keep running it if its wrong. I’m baffled. Ive replaced fuel pumps before and never had the both return and out take lines on the pump.

Should be just fine to drive.

Fuel Pump Testing for 1993 MODELS

2.5L/4-151 & 3.0L/V6-181


1. Release fuel system pressure as outlined under”Fuel System Pressure Relief. “
2. Disconnect5-16 inch fuel supply hose from engine fuel line assembly.
3. Connect fuel system pressure tester tool No. C-4799B or equivalent between fuel supply hose and engine fuel line assembly.
4. Activate fuel pump and pressurize the fuel system using the DRB II scan tool.
5. If gauge reads 13. 5-15. 5 psi, pressure is correct.
6. If pressure is not as specified, record pressure, then install pressure tester in the fuel supply line between the fuel tank and fuel filter at the rear of the vehicle.
7. Activate fuel pump and pressurize the fuel system using the DRB II scan tool.
8. If pressure is 5 psi higher than previously recorded, replace fuel filter.
9. When no change is pressure is noted, gently squeeze return hose. If pressure increases, replace pressure regulator. If there is no change in pressure reading, problem is either a plugged pump filter or a defective fuel pump.
10. If pressure is higher than specified, remove fuel return line hose. Connect a three foot hose to the return line. Place other end in a suitable container.
11. Repeat test. If pressure is now correct, check intank return hose for kinking or restrictions.
12. If pressure is still above specified pressure, remove return hose from throttle body and connect a suitable hose to the throttle body and place the other end into a suitable container.
13. repeat test. If pressure is now correct check for a restricted fuel return line. If change is pressure is not observed, replace fuel pressure regulator.
Dec 202018

Jeep Cherokee

There are conflicting reads that my 2019 Jeep Cherokee does/does-not have Rain-Sensing-Wipers. Anyone have access to dealership programmable options to check this out?

It is definitely available on the older Cherokees. I don’t know for certain if it is for the 2019. I wouldn’t think they would discontinue the feature though.  I will post this  so others may have a chance to post if they know different.

Dec 202018

Winter Driving

Is it advisable to warm up a vehicle prior to driving it in very cold winter conditions? I would like to know the pros and cons of this including whether driving a vehicle in the cold without warming it up first is hard on it mechanically or could cause potential damage. Please apply to all vehicles made within the last 15-20 years.

Warm up a vehicle prior to driving it in very cold winter conditions?

Yes. I would advise allowing the vehicle to warm under VERY cold conditions. That being said, the vehicle manufacturers have put in place many sensors on the vehicle that allow for not warming it prior to driving. These sensors calculate the temperature and fluctuate the demand influenced on the vehicle. This allows for uninterrupted performance in hot or cold weather. 1995 – 2000 are not quite as good as the newer vehicle operating systems but are adequate none the less.

Metal expands, aluminum expands at a different rate than cast iron. But as long as there is enough lubrication at the friction points of the engine, little to no harm is done. It takes a long time for a properly lubricated engine to show signs of damage. On the other hand, the transmission will render more damage under different climate conditions than the engine. However the later model cars are manufactured using synthetic lubrication in the transmissions now that help. So the weakest point in the car is the transmission under any weather condition.

Mechanical parts will perform their best in the engine and transmission once warmed to normal operating temperatures. The damage that will occur is almost immeasurable in short term.

Pros and Cons of warming your vehicle in cold temperatures


  • The engine oil will lubricate at its best once warmed
  • The vehicle will be nice and comfy warm
  • Windshield will be defrosted if applicable
  • Windshield wipers will perform better


  • The windshield will most likely have frost on it making it difficult to see
  • Not optimal for engine lubrication
  • Fuel consumption
  • Exhaust fumes, especially when vehicle is parked in a garage

What others have to say about warming the vehicle in cold weather

“The oil is the lifeblood of the engine,” Joseph Henmueller, president and COO of Automotive Maintenance and Repair Association, said.

Henmueller suggested that cars should idle one to two minutes before driving in cold weather. When temperatures drop to freezing, or when it’s cold enough that windshields will frost over, the oil needs to warm up before it can move smoothly throughout the car.

“Fluids get thicker when it is cold, so to lubricate properly they need 60 to 120 seconds of the engine running,” he said.

Without properly letting the engine run, Henmueller said, you may be cutting your engine’s life short.

Experts at Penzoil have a different theory.

Technical Advisor Shanna Simmons said it is a myth that engines need to idle on a cold winter day.

“While it does take longer for motor oil to pump in extreme cold temperatures, we are talking milliseconds, not minutes,” she said. “Your engine will warm up the oil much faster when driving at full speed — not to mention idling wastes gas.”

The Environmental Protection Agency lines up with those who say warming up your car is not only not helpful but is wasteful.

Both the EPA and say a car should not idle for more than 30 seconds at a time. Not only is it more environmentally friendly, but also cost-effective. Idling for 30 seconds actually uses more fuel than restarting the car.