Question about 1999 Toyota Tacoma PreRunner

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Single female with intermitatant emission problems(please help)

For about the last year every three months or so my truck(automatic,3.4L 6 cylinder) will start and idle very rough.When I put it in drive it does not want to move.It will go fine in reverse,low and 2nd.After a few minutes it will start running fine and do so for several months. I have noticed if I put regurlar unleaded in it it will be worse.I have changed the transmission fluid and filter.It has been about 2 years since I changed the fuel filter.Also the gas milage has dropped from about 21 miles to the gal. to 17.The problem seems to happen when it is hot,like when I drive about 20 miles and then stop.Like I said it only does it every tree months or so.Hard to trouble shoot like this.
The check engine light does not come on.I have run diagnostics anyway in case the light was bad and it does not pick up any codes.
I have been trying to check the EGR valve and every diagram I find seems to put in a different location.

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  • Toyota Master
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I vented yesterday about GM so won't repeat it here.

You should be able to locate the EGR valve by checking anything attached to the exhaust manifold and following lines.

The EGR is typically equipped with a drum shaped housing with fittings on the top and bottom, sometimes (often) mounted on the exhaust manifold itself.
The drum houses the diaphragm that is controlled by vacuum and opens a small path between the exhaust manifold and the intake side to inject (supposedly) some unburned gases to burn again.

Since we are kind of anonymous here, I can admit to having cheated all of them since it mostly brings a little more mileage.
Stuffing a ball bearing in the vacuum hose and reattaching it to the EGR lets it appear to be functional.
While still in CA, we never had a vehicle fail emissions testing despite this 'cheat.'

If the EGR valve has failed and stuck open, then exhaust gases are entering even at an idle which can cause the symptoms you describe.
Engines running at mid-RPMs can tolerate the garbage being fed them without gagging, but not at an idle.

Good luck-

Posted on Aug 07, 2008

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Posted on Jan 02, 2017

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