Q: How do I replace the spark plugs on a 1994 Lexus GS 300 ?

asked by on April 26, 2017

I am wondering how the best way to replace the spark plugs on my 94 GS 300 would be?

Spark Plugs Replacement $98.11 - $669.97 Get a Quote

The best way to replace the spark plugs on this vehicle would be to first open up the hood. Since this vehicle has a stright six engine, the spark plugs should be fairly easy to get to and should be located near the top of the engine within the valve cover. There is likely a plastic cover that goes over the spark plug wires or ignition coils with the Lexus logo on it to give the engine a good appearance. This cover will need to be removed. Once this cover is removed, the ignition coils or spark plug wires will be visible. You will know they are for the spark plugs because there will be six of them and they will all be identical. The six wires or igntion coils will need to be removed to gain access to the spark plugs themselves. Once the spark plug wires have been removed, use a long ratchet (for leverage), a long extension (to reach inside the spark plug cylinder), and a magnetic spark plug socket (for easy removal) to loosen and remove the spark plugs. Once the spark plugs are removed, check the manufacturer’s recommendations for any gapping that may be necessary for the plugs. Once the plugs have been gapped, apply some anti seize to the threads on the new plugs to make them easier to get out next time. Install the new plugs and tighten to the manufacturer’s specification. Reinstall the spark plug wires or ignition coils. Finally, reinstall the engine cover. If you need further assistance with this service, consider YourMechanic as a certified professional can come to your home or office to replace your spark plugs for you.

The best way to replace the spark plugs on this vehicle would be to first open up the hood. Since this vehicle has a stright six engine, the spark plugs should be fairly easy to get to and should be located near the top of the engine within the valve cover. There is likely a plastic cover that goes over the spark plug wires or ignition coils with the Lexus logo on it to give the engine a good appearance. This cover will need to be removed. Once this cover is removed, the ignition coils or spark plug wires will be visible. You will know they are for the spark plugs because there will be six of them and they will all be identical. The six wires or igntion coils will need to be removed to gain access to the spark plugs themselves. Once the spark plug wires have been removed, use a long ratchet (for leverage), a long extension (to reach inside the spark plug cylinder), and a magnetic spark plug socket (for easy removal) to loosen and remove the spark plugs. Once the spark plugs are removed, check the manufacturer’s recommendations for any gapping that may be necessary for the plugs. Once the plugs have been gapped, apply some anti seize to the threads on the new plugs to make them easier to get out next time. Install the new plugs and tighten to the manufacturer’s specification. Reinstall the spark plug wires or ignition coils. Finally, reinstall the engine cover. If you need further assistance with this service, consider YourMechanic as a certified professional can come to your home or office to replace your spark plugs for you.

The best way to replace the spark plugs on this vehicle would be to first open up the hood. Since this vehicle has a stright six engine, the spark plugs should be fairly easy to get to and should be located near the top of the engine within the valve cover. There is likely a plastic cover that goes over the spark plug wires or ignition coils with the Lexus logo on it to give the engine a good appearance. This cover will need to be removed. Once this cover is removed, the ignition coils or spark plug wires will be visible. You will know they are for the spark plugs because there will be six of them and they will all be identical. The six wires or igntion coils will need to be removed to gain access to the spark plugs themselves. Once the spark plug wires have been removed, use a long ratchet (for leverage), a long extension (to reach inside the spark plug cylinder), and a magnetic spark plug socket (for easy removal) to loosen and remove the spark plugs. Once the spark plugs are removed, check the manufacturer’s recommendations for any gapping that may be necessary for the plugs. Once the plugs have been gapped, apply some anti seize to the threads on the new plugs to make them easier to get out next time. Install the new plugs and tighten to the manufacturer’s specification. Reinstall the spark plug wires or ignition coils. Finally, reinstall the engine cover. If you need further assistance with this service, consider YourMechanic as a certified professional can come to your home or office to replace your spark plugs for you.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Loud constant noise from engine approximately 30 secs after start - check engine light on - code P1404

Faulty EGR valve

Can you put a drive shaft on crooked

The drive shafts that connect the transmission to the wheels are called half shafts or propeller shafts and in most cases are not able to be put in crooked. They are either put on using fitted flanges or straight shafts....

Got new water pump less than 9 months ago. Now boiling sound and overheating smell. Temp says its good

Hello. The overheating issue your vehicle is having is likely not caused by the water pump once again. Though an inspection of your water pump performance should be checked when trying to diagnose this issue. The temperature gauge not going...

My Acura TL 1999 has a idling problem. It idles high to low. And it takes a while for the gears to switch when I'm reversing and in drive.

For the idle condition, check the (IAC) Idle Air Control Valve and see if its plugged up. You can take it off and clean it and then put it back on. If the idle continues to be irreratic, then the...

How to fix

Yes, absolutely, if you would please set up a mobile fuel leak diagnostic a certified mechanic from YourMechanic will travel to your location, find the fuel leak(s) and let you know of the repair strategy and cost. Leaks of course...

It stalls while driving, fuel pump has been replaced, checked fuel module...still stalls in middle of road

There are a huge amount of possible causes for your stalling problem. They include other fuel related components, ignition (spark) components, electrical components, or air intake components. Do you know for a fact your technician scanned the computer for...

Pinion bearing making noise

The pinion bearing is a common issue with Ford rear ends. Most of the time, this failure is due to a differential leak that was not addressed and the bearing run dry. I recommend having a trained technician, such as...

Fuel leak.

A vehicle can leak fuel from dozens of places. Fuel leaks can also be very dangerous. This is a repair best left to certified technicians, like the ones at YourMechanic. Have this problem diagnosed right away to ensure safety and...

Related articles

A Buyer’s Guide to the 2012 Lexus RX
The The Lexus RX paved the way for luxury crossover utility vehicles over a decade ago, and now it continues to make waves and turn heads. An incredibly attractive vehicle, the RX (now available as either the regular RX 350...
Top 10 Factors to Consider When Buying a Luxury Car
The The idea of owning a luxury car is appealing. The glossy paint, swoopy lines, and prestigious badges speak of the owner’s success in life, while the interior opulence offers scented leather surfaces, high-tech telematic devices, and all the creature-comfort...
A Buyer’s Guide to the 2012 Lexus LFA
When When it comes to supercars, Lexus probably isn’t the first name that comes to mind. The 2012 Lexus LFA was the automaker’s attempt to change that. It’s a compact coupe that seats two and offers blistering acceleration. However, the...