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almost but not quite

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Old 04-20-2017, 10:39 AM   #1
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almost but not quite

...driving to work at 1:45 am and just pull onto the highway when the engine dies! I coast to the shoulder. Like an idiot I didn't have a 'break-down kit' (emergency stuff in case of a breakdown). The truck was sitting a little too close to the highway so I crank the wheels to the right and give a push. My truck then rolls down an embankment into some brush and small scrub trees (remember it's early morning and I'm w/o a flash light). Well, I'll let AAA resolve that problem when I get off of work.

The truck turns over easily but it just won't run but for a few seconds. I figured I had a faulty fuel pump and/or filter. When I finally got around to it, I lifted the bed and pulled the pump. I hooked the pump to the battery and got nothing.Picked up a new pump, replaced the bed and fired her up. Runs for about 5 seconds. It would take me
forever driving to work in 5 second intervals so I replaced the filter. Stll NO change:-( I've got 13+ volts at the battery, the EFI relay meets specs and I'll check the the circuit opening relay when I find it:-/ I could use some guidance/ recommendations so I can get this truck ('99 Taco 4x4 w/5vzfe &
auto tranny) back on the road. Thanks
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Old 04-21-2017, 12:07 AM   #2
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Red face

Pray tell just what are you working on here ??

Since it is in this section I am guessing A OBII vehicle??

Has your MIL turned on ?? Have you pulled any codes just in case ??

Most times if it starts and shuts off the ECM is not seeing a signal and shuts off fuel to a engine it thinks is not running

Some that come to mind are the Crank Cam sensors and Igniter circuits
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Old 04-21-2017, 06:38 PM   #3
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It says at the end of the post. '99 V6 Taco.

Does it stall abruptly or does it stutter at all before it quits?

Does it restart fine, but only run briefly before stalling again?
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Old 04-22-2017, 04:37 AM   #4
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Hey Pineapple

Can you briefly let us know if the starter cranks the engine? Also do you hear the fuel pump humming when you put the key in on ON?

So, from what I understand, sounds like you may have a broken ground/wire on one of the solenoids. I had a similar incident on a 4runner, also on the highway - the 4Runner engine stops running (no warning sign, just turns off) suddenly when cruising at regular speeds, then it came back on briefly...then again turned off. The starter cranks the engine fine.

Try gently pulling on the wire harnesses that are going to/away from the solenoids. It may allow the engine to run when you start it, but it wont actually fix the issue and most likely will happen again.
If you are ok working with wires, you can manually add a ground wire to the the solenoids' ground connection to see if it will work.
But do trace the problem with a volt meter for continuity.

Let us know.
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Old 05-07-2017, 06:13 AM   #5
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Sorry for he delayed response. Had to go to FL to check up on my 91 yr old mom who still insist on doin' things like climbing ladders to paint trim, etc:-/

Got back last night and noticed I've got some mowing to do after a week of rain:-/ I did replace the fuel pump and relay before I left (both failed and/or weren't up to specs).

Truck cranks normally and will 'run' for 3-8 seconds before dying. Plan on lifting bed to see if I 'flubbed' the fuel lines some how as soon as I finish mowing. Thnx for responding.
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Old 05-15-2017, 11:08 AM   #6
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the saga continues:-(

It's been a little over a week and finally got time to work on theTacoma. Lifted the bed again to access the fuel pump. It's operational. EFI relay (under the hood) was within specs. Replaced the circuit opening relay (located under dash near steering column) which was not within specs. Also replaced fuel filter (250 K miles on old filter) and it still turns over normally and RUNS for three to four seconds then dies. :-( All of the fuses checked out (not only visually but checked w/ meter also).

Question: shouldn't you be able to blow air through the fuel filter? I tried w/ new one but couldn't.

Question: I'm embarrassed and red faced, but the small end of the fuel filter should be pointing toward the front (engine)?
Any help/suggestions are appreciated. Thanks
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Old 05-16-2017, 08:16 PM   #7
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I'll add my vote to @Wyoming9 for Crank or Cam sensor. The fuel pump does NOT run with key ON, as a post stated above. It only runs while the starter is cranking or the ECM sees that the engine is turning. If it doesn't get those crank/cam signals, it thinks the engine has died and cuts the fuel pump. Fits the case perfectly. I can't think what else does.

I'd hitch a test light to the Circuit Opening Relay and see if that is what is happening.

Last edited by TheDurk; 05-16-2017 at 08:19 PM.
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