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Car Forum / Toyota / Toyota Cars / November 2008spark plugs.
I got a 1989 Cressida recently it has done 190,000 kilometres I have no idea when timing belt and plugs have been changed. If I removed a plug could I tell from visual inspection if they needed changing or is the computer clever enough to tell when they are a problem? I am hoping that the belt has been changed at the correct time which would give me another 130,000 kilometres. > I got a 1989 Cressida recently it has done 190,000 kilometres I have no > idea when timing belt and plugs have been changed. > If I removed a plug could I tell from visual inspection if they needed > changing or is the computer clever enough to tell when they are a problem? > I am hoping that the belt has been changed at the correct time which > would give me another 130,000 kilometres. Good idea remove the plugs, I bet anything unless you drive all hwy they are black. And change them, and cap, wires, rotor, and belts, oils, etc etc. Its obvious you dont know enough to even take care of any car, The computer wont do anything like that. It wont, keep, the timing correct. Old belts stretch, its an easy way to loose 3-4mpg and power. A 20 year old car should have a complete go over by a pro with the right equipment, I bet alot of components are bad on your car that are reducing milage. But then again at 20 years how good is it, whats it worth. At least have someone visualy inspect the all belts, hoses, battery, transmission oil, Differential Oil!, cooling system. Set the timing, and change plugs. If you plan on keeping it then alot more needs attention, I bet the cooling system and transmission are also a mystery to you and may be 17 years overdue on maintenance. >> I got a 1989 Cressida recently it has done 190,000 kilometres I have no >> idea when timing belt and plugs have been changed. [quoted text clipped - 16 lines] > needs attention, I bet the cooling system and transmission are also a > mystery to you and may be 17 years overdue on maintenance. I have had the car only a few months.It is in excellent condition I do not have its history I have never had a car with fuel injection I have never had a vehicle serviced by others (always done my own)I have managed to keep my 26 year old R100 bike going for 24 years maintaining it my self It was 2 years old when got it. Maintained my own cars for nearly 50 years including panel beating and spraying, rebuilt engines in my first cars. This is the first vehicle without a carby and the first with computer and platinum plugs so I suppose I must be a bit of a dill not knowing much about it Ps I have already managed to diagnose a failed oxy sensor from codes so I am learning > I got a 1989 Cressida recently it has done 190,000 kilometres I have no > idea when timing belt and plugs have been changed. > If I removed a plug could I tell from visual inspection if they needed > changing or is the computer clever enough to tell when they are a problem? A 1989 car computer isn't smart enough to do that, especially if the car has a carburetor, but this illustrated guide from NGK can help you determine the conditions of your spark plugs: http://tinyurl.com/6de8tl NGK and Denso are the best brands for a Toyota. If access to the plugs is easy, don't hesitate to use ordinary plugs, which last 30,000 miles. It's also important to check the plug wires, visually for tears and cracks, with an ohmmeter for resistance, and also with a spray bottle while the engine is running in somewhat dim light to see any sparkling, which indicates defective insulation on the plug wires. >I got a 1989 Cressida recently it has done 190,000 kilometres I have no >idea when timing belt and plugs have been changed. > If I removed a plug could I tell from visual inspection if they needed > changing or is the computer clever enough to tell when they are a problem? > I am hoping that the belt has been changed at the correct time which would > give me another 130,000 kilometres. Look for a sticker somewhere in the engine compartment, starting with the timing belt cover and radiator support that indicates when the timing belt was replaced. If there is no sticker, then you will have to remove the top of the timing cover to check the condition of the timing belt. The replacement interval is 100,000 Km. If you remove a spark plug, you should be able to tell from visual inspection whether or not they need replacement. Platinum spark plugs have a life of approximately 100,000 Km. Look for signs of oil collecting in the valley between the camshaft towers.  SignatureRay O (correct punctuation to reply) >> I got a 1989 Cressida recently it has done 190,000 kilometres I have no >> idea when timing belt and plugs have been changed. [quoted text clipped - 14 lines] > > Look for signs of oil collecting in the valley between the camshaft towers. oops I was working on 100,000 miles for plugs and belt (dont know where I got that from )(that is why the funny klm figures) Ordinary plugs I can tell wear. It was the unknown platinum that I was unsure about I have since looked at a new one so I may be able to tell wear when I look >>> I got a 1989 Cressida recently it has done 190,000 kilometres I have no >>> idea when timing belt and plugs have been changed. [quoted text clipped - 16 lines] > oops I was working on 100,000 miles for plugs and belt (dont know where > I got that from )(that is why the funny klm figures) 100,000 miles is about right for both items. Toyota used to recommend 60,000 miles for belts, and 100,000 miles for plugs, but the belt replacement has changed. And, you can't always go by the condition of the belt. The belt in my Subaru *LOOKED* good, but broke anyway in rush hour traffic. If you're in doubt, have it changed. That is, of course, unless it actually *DOES* look bad, then change it! The good news? With this car, as long as you're not trying to race against a 300ZX, if the belt goes, you'll just coast to a stop. I even broke one climbing a hill with no engine damage. Good time to make sure your AAA is paid in full! ;) > Ordinary plugs I can tell wear. It was the unknown platinum that I was > unsure about I have since looked at a new one so I may be able to tell > wear when I look >>> I got a 1989 Cressida recently it has done 190,000 kilometres I have no >>> idea when timing belt and plugs have been changed. [quoted text clipped - 21 lines] > unsure about I have since looked at a new one so I may be able to tell > wear when I look The replacement interval for spark plugs and timing belt is 60,000 miles. Evaluate the condition of platinum spark plugs the same way as you would for conventional plugs. SignatureRay O (correct punctuation to reply) |
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