Question: as soon as on vacation, I generally drive long ranges at high speeds. I never ever seem come be near an waiting pump in the morning to inspect the tires as soon as they are cold. Is there a dominion of thumb for how long to wait prior to the tires space cool sufficient to check the pressure? Is there any rule because that translating a cold push to a warm pressure? because that example, if ns measure the pressure cold in the morning and need three pounds, can I just add three pounds later when they are hot?--C.R.

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Answer: The dominance of ignorance is the you must wait three hours with the automobile parked before the tires space cool enough to get specific pressure reading. In addition, you should try not come drive much more than one mile in obtaining to a pump if you want to recheck the pressure when you add air.

These rules may sound difficult, but there are some easy short cuts. If her tire press is a bit low in the morning, you could consider including one or two extra pounds in ~ an wait pump at the finish of the day. Then, the following morning, once the tires space again cool, you can change the pressure precisely by letting air the end of the tires.

I to be not mindful of any kind of rule of ignorance for translating a cold-pressure rating to a hot-pressure rating. If you are down 3 pounds the pressure once the tires space cold, then you can probably come close come the right push by adding that amount once the tires space hot. Normally, tire push rises five pounds every square customs after sustained freeway driving. If girlfriend do add air once the tires space hot, friend should more than likely double-check the pressure the next morning.


Q: my 1982 Honda Accord through an automatic transmission sometimes experiences violent shiver upon beginning when cold and also at other times when it is restarted. In both cases, the automobile shakes strongly for around five minutes. My Honda go this more frequently as soon as parked ~ above a hill.--M.M.

Q: my 1983 Honda Accord vibrated once backed out in the morning. It to be so violent the things dropped off the dashboard. It arisen for number of minutes and also then disappeared. I was so frightened by this trouble that I marketed the Honda and decided never to buy another one.--D.J.R.

A: Honda has identified a defect in the car that would certainly account because that these problems. However there likewise other feasible causes.

The violent vibration and also shaking are most likely led to by serious misfiring that one or more cylinders. The reason could range from fouled spark plugs come a problem in the digital ignition system.


Another possible cause is explained in Honda service bulletins concerning an overly rich fuel problem that wake up on restarting a warm car. The wealthy condition reasons misfiring and also severe shaking.

The rich condition results when a hot engine is shut turn off on a warm day. The warmth retained within the engine compartment causes gasoline to broaden inside the fuel line and carburetor, resulting in what is recognized as percolation. The fuel pressurizes, floods the carburetor to rise bowl and also then spills into the input manifold.

When the auto is restarted, the entry manifold is full of gas and causes the engine to operation erratically for a few minutes until it is clearing out. Honda’s solution to this difficulty has to be to market a device that operates the electric cooling pan under the hood for a few minutes after the engine is turn off. This keeps the fuel cool enough to prevent percolation.

Possibly, the two readers’ difficulties are pertained to this condition, except that the fuel sits about inside the entry manifold till morning. A rich problem doesn’t usually reason problems in a cold engine, however with the choking on and the extra fuel in the manifold, this can be the cause.

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Ralph Vartabedian is a former national correspondent at the Los Angeles Times and also became a special contributor in April 2020. He joined the newspaper in 1981 and also has covered many technical subjects, including aerospace, auto safety, atom weapons and also high rate rail. He has actually won two Loeb awards and was a Pulitzer finalist, amongst many other career recognitions.