Surging

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Surging

Postby v8hilux308 on Fri, 30 Aug 2013 4:48 +0000

Hi all, I have the 05 06 model hilux 4x4 which is surging on me from time to time, it seems to happen more in 2nd and 3rd gears when accelerating, it also throws into limp mode, but not necessarily when it surging, it can just happen anytime.
I've had it to toyota to check fault code and it comes up stepper motor, but because this is a generic code it could be any number of things. Has anyone had or heard of this surging, any help on this would be very much appreciated
Cheers.
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Re: Surging

Postby boxhead55 on Fri, 30 Aug 2013 5:17 +0000

Your right could be a host of things

Like

Very dirty maf sensor ( air flow sensor)

Very dirty map filter. ( manifold pressure sensor)

Sticking or stuck turbo vain motor

Lose/ corroded/ or internally broken turbo vain motor wiring

Sticking intake manifold swirl butterfly flaps.

Blocked intake manifold from egr soot

Sticking egr control valve.

The list goes on

But being that it is intermittent that is a good thing.

Nothing is fully blocked

Look at the swirl butterfly control vack hoses and see that the unit moves freely and also pay a little attention to your sensors clean them and see how u go.
Possiably a sticking egr valve as well.
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Re: Surging

Postby helmut79 on Fri, 30 Aug 2013 8:04 +0000

Check out this thread & Steve9r comment about the SCV - Suction Control Valve

viewtopic.php?f=29&t=8516&p=288436#p288436
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Re: Surging

Postby boxhead55 on Fri, 30 Aug 2013 8:18 +0000

yea. Forgot about the scv. That could also be part blocked.

Good call.
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Re: Surging

Postby boxhead55 on Fri, 30 Aug 2013 8:20 +0000

due to the thrown code will be in the induction location some place.

Just a guess.
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Re: Surging

Postby helmut79 on Fri, 30 Aug 2013 8:22 +0000

I think my SCV is gone too, as mine idles rough every now and then or it's on its way out!!
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Re: Surging

Postby Steve9R on Fri, 30 Aug 2013 9:06 +0000

yeah.. mine went as you mentioned above, and i had the SCV (suction control valve) replaced, fixed the 'missing' issue straight away..

As i mentioned in that other thread, the wear on the shaft on the valve was quite severe.. and considering this thing travels up and down 30000 times a second to keep the common rail fuel pressure up...

Image
Image

you can just make out the scratches on the shaft which was causing the issues for me..

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Re: Surging

Postby v8hilux308 on Fri, 30 Aug 2013 9:35 +0000

Cheers guys should mention that the motor has only done 60000ks I put it in after the last engine ran the bearings due to the injector seals leaking and blocking up oil pick up. I brought it with a poked motor.The newish motor I put in is very clean inside. Not to say that one of the sensors isnt on its way out, I have cleaned flow sensors, made no diff. Also sometimes the idle seems a bit rough when you come to a stop, but this only lasts for few seconds. Will check out the SCV and see how it looks. I still have the old motor so I have plenty of parts to swap round if need be.
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Re: Surging

Postby Parr on Fri, 30 Aug 2013 9:42 +0000

have you checkedthe vacuum lines on the cooler and turbo for splits?
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Re: Surging

Postby Diezel45 on Fri, 30 Aug 2013 10:01 +0000

This might sound a bit weird, but does your car have cruise control?
All the gear, With no idea

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Re: Surging

Postby v8hilux308 on Fri, 30 Aug 2013 1:11 +0000

No I don't have cruise control, all vacuum lines look new. Just tried the SCV, took it out had a look at it and looks the same as pic shown from Steve, but without the marks. But since I had it out I replaced it with the one from my other motor and its still surging. Cheers Boxhead for your list of possibles. You make mention of the swirl butterfly? not sure what that is. EGR mint. All wiring looks good and all plugs clicked in.
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Re: Surging

Postby Diezel45 on Fri, 30 Aug 2013 1:18 +0000

Oh ok. The same thing happened to me almost exactly as you described it, turns out it was a fault within the cruise. So that's why I thought I would ask. :)
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Re: Surging

Postby v8hilux308 on Fri, 30 Aug 2013 1:29 +0000

Cheers starting to wish it did
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Re: Surging

Postby Barny on Thu, 12 Sep 2013 11:03 +0000

Diezel45 wrote:Oh ok. The same thing happened to me almost exactly as you described it, turns out it was a fault within the cruise. So that's why I thought I would ask. :)


Mine has been doing something very similar. It feels like (like in older cars) the accelerator cable is slipping, but then fixes itself. Feeling the turbo goes limp and gutless, resulting in me putting my foot to the floor with no results.
I went to my mechanic and they said that the accelerator sensors were mis communicating with each other. They disconnected the battery to reset the computer and it fixed it for a while but its back!
Only happens every now and then.
Very interested to hear it could be the cruise control, what exactly was the problem?. How did you fix yours Diezel?
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Re: Surging

Postby boxhead55 on Thu, 12 Sep 2013 11:13 +0000

Cruise controls are becoming an issue.
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Re: Surging

Postby helmut79 on Thu, 12 Sep 2013 1:20 +0000

boxhead55 wrote:Cruise controls are becoming an issue.


Pretty open statement mate, how do you mean? Can you enlighten us further?
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Re: Surging

Postby boxhead55 on Thu, 12 Sep 2013 1:36 +0000

The control units mucks with the actual and target throttle position to hold a constant spot, and they do it in such a way that it overcomes the fail safe threshold.

After time. Bad contacts,slowing capacitors, dirty switch contacts and possible faulty aftermarket cruse control modules. Cause a throttle position out of threshold code. This causes a limp home moment.

I have found the actual and target throttle positions can sometimes be 30% different in the faulty units. This causes the code.

Leave the unit disconnected or changed the old unit out. Fit a new unit all seems to work ok again.

The Toyota throttle unit runs a 2 axis sensor. So if one fails the other will still work. One reads 0 to 100% the other reads the other way 100 to 0% and they have to be within a certain margin to work correctly. If not codes are thrown and fail safe is engaged.

The aftermarket cruise controls muck with These two sensors and it has to be spot on.

Many have been left disconnect and had no problems since.

Just what I have experienced.
Hope this helps.
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Re: Surging

Postby Diezel45 on Thu, 12 Sep 2013 7:28 +0000

i fixed mine by unplugging the cruise from the top of the accelerator pedal and just diverting it straight to the accelerator, take a lap around the block, come back and plug the cruise back in again. worked perfectly and never had a problem with it again. (probably been 6 months now)

hope this helps.
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Re: Surging

Postby boxhead55 on Fri, 13 Sep 2013 4:44 +0000

Diezel45 wrote:i fixed mine by unplugging the cruise from the top of the accelerator pedal and just diverting it straight to the accelerator, take a lap around the block, come back and plug the cruise back in again. worked perfectly and never had a problem with it again. (probably been 6 months now)

hope this helps.


That will work, I would also suggest u disconnect the battery for 10 min as well to clear the self learn. But as it said it is a percentage thing. Eventually it will happen again.

As you said,

(disconnect cruise unit plug original plug back on. clear codes drive a short distance then disconnect the battery will temporally fix) .

This does work to fix this problem for a duration of time.
The duration of (fixed) time varies from customer to customer.

We have found if the cruise constantly gives you this fault. It is time for a new cruise control.
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Re: Surging

Postby obiee on Fri, 13 Sep 2013 5:24 +0000

boxhead55 wrote:Cruise controls are becoming an issue.

had the same happen with my 07 d4d it would be running fine for weeks then all of a sudden it would loose all power then go into limp mode i would pull over and curse the thing for 5 mins then would be fine and wouldnt do it again for ages i thought it was the chip so i disconnected it but it still happened. it ended up being my cruise control something to do with the flyby wire i disconected it and connected chip back up and have never had a problem (30,000km) since.
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