No restart in warm weather? It's probably vapor lock

  • Article by: PAUL BRAND
  • Updated: August 16, 2011 - 6:58 PM

Q No dealership has been able to fix the problem with my '96 Toyota Tacoma. For a year now, once the vehicle has been driven for at least a half-hour in warm weather and it is turned off and sits for a few minutes, it will not restart unless you wait for at least 40 minutes for the engine to cool. It seems like it wants to start but the vehicle is "thirsty" for fuel.

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enonormanAug. 17, 11 7:29 AM

'96 Toyota Tacoma owner, A simple way to clear the overheated fuel is that you can simply cycle the key from off to on several times and the fuel pump will run for approximately ten seconds during each cycle. This puts cool fuel in the fuel rail. Also make sure you are using the correct octane rated fuel in your car. The easiest way to increase the octane rating is to add more alcohol which has a lower boiling point than gasoline. Minnesota requires the average unleaded fuel to have 10% ethanol added. At times it might be zero, summer blend, and at other times it will be in excess of 20%, winter blend light fuels with high vapor pressure. /////////////////////////2005 Lincoln LS with only 40,000..... If you were having your vehicle serviced at your local dealership a simple run of oasis would have determined if any TSB or owner notification programs were available/applicable to your vehicle. All dealers have the ability to provide this service and do so at no cost to customers. All the dealers in the metro and surrounding area have service menus that are competitive or in most cases a better value for the customer. When you have a working relationship they will not sell you services or products you do not need and their parts are the correct ones designed specifically for the vehicle. Alldata is months, if not years out of date. It is better than nothing, but the dealers always have the best, complete and up to date information.

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donotbugmeAug. 17, 1111:06 AM

Tacoma owner: have your dealer check the crank sensor. I had the same symptoms with a different vehicle several years ago. On a hot day, after shutting the engine down, it wouldn't restart for about 15-30 minutes. Turns out that the crank sensor was overheating when the engine reached its peak temperature after shutdown with the cooling system off. When trying to start under those circumstances, the engine computer didn't think the crank was turning, hence it wouldn't send any fuel. Once the engine was cool enough that the sensor would work correctly, it would start and operate normally. The crank sensor was apparently on the ragged edge of failure, only failing above a certain temperature. This was a reasonably inexpensive repair, though I think it was covered under warranty. /// With respect to Alldata, remember that if you live in the Twin Cities metro area you can use it for free at your public library.

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lindn1Aug. 21, 11 6:26 PM

These symptoms sound like what I experienced on my wife's 91 Accord. The problem was a faulty main relay. This is a fairly common problem with the Accord, but I'm not aware of other brands being affected.

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