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Old 10-31-2011, 11:38 AM   #1
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Angry Engine failure

Hi:
I have a 1999 Tacoma Pre-Runner 3.4L. While driving home My Taco.. started to shake, like if a spark plug failed. When the engine is cold it runs like a breeze but when hot it starts to shake. The computer read P306. The mech.. changed the 6th cyl. coil but it's still shaking. He checked the sparks and cables but everything was Ok. I cleaned the injector connector with electronic contact cleaner but did not work. Please help.
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Old 10-31-2011, 08:57 PM   #2
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pull your spark plug out and check to see if it's wet, soaked with fuel. your injector might be stuck open which can cause a misfire. did you change your spark plug wires too?
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Old 11-01-2011, 05:07 AM   #3
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Engine failure

Hi SCWERKS:

The Sparks were OK, I did not change the cables, that will be my first move. I'll change the cables then if that doesn't work I'll go for the injector. By the way, can you tell me what did you mean by the injector "stuck open"? I'm not a mechanic that's why I'm asking.
Thanks
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Old 11-01-2011, 05:10 AM   #4
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The injectors deliver intermittent shots of fuel to your cylinders for combustion, if they get stuck open, it just means your constantly doseing that cylinder with fuel, making it too rich to ignite properly
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Old 11-01-2011, 05:13 AM   #5
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Quote:
Originally Posted by CitizenJoe View Post
Hi SCWERKS:

The Sparks were OK, I did not change the cables, that will be my first move. I'll change the cables then if that doesn't work I'll go for the injector. By the way, can you tell me what did you mean by the injector "stuck open"? I'm not a mechanic that's why I'm asking.
Thanks
If the cable does not fix it, I would suggest getting a compression test done. It should be 125 psi or higher
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Old 11-01-2011, 11:44 AM   #6
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Thanks to all! I'll change the cables and see what happens. Get in touch later.
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Old 11-23-2011, 09:08 PM   #7
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i have the exact same problem, did your truck get fixed by replacing the wires?

i have replaced my wires, plugs and need to replace my direct iginiton coil i think.

can anyone please help me
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Old 11-24-2011, 09:39 AM   #8
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Well, k5blaser88, I replaced the wires but did not work. It was the 6th cylinder injector! I changed it and hey! the failure is gone. I spent quite an amount of $ but I'm glad I did. The fact is that the injectors are not so accesibles (at least in my 1999 Tacoma Prerunner 3.4L) the mech. had to retired the "Plenum", that's a big piece of metal located at the top of the engine. You can start changing the wires because you should change them anyway and then if that does not solves your problem then go for the injector. I hope this helps.
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