Revs - hunting

Having problems with your vehicle? Or need advice on repairing or servicing your Hilux? This is the place to ask for help
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dalkill
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Revs - hunting

Post by dalkill »

OK, so the new baby finally arrived on Sat.

After all that 3000D / 3.0DE / 2.7i back and fro, the wife and my dad both told me I should go cheaper on the bakkie and keep the car for the wife.

So for sake of family ties, and finanses, I bought the 1990 2.2 DC with the new factory engine - that engine was about the only selling point for me, buying the thing blind from JHB. Spoke to my uncle at Toyota and he says the engine alone is worth R30K - could this be. I paid R40K for the bakkie :shock:

OK, so now that I'm officially an hilux owner, my first official tech question....

She purrs like a kitten when idling, just when I cruise up the driveway, and she sits at about 1500rpm, then the revs starts to hunt from 1000 to about 3000rpm and she either jumps forward or almost stalls.

Even when driving at about 60, then the rev counter jumps all over the place, but the engine remains constant however. I thought maybe in this case, its just the fact that the entire freaking bakkie is hoping as if the axils was bolted onto the chassis directly. I forgot how bumpy those SFA are.

Could this be the carb that needs to be reset of coast conditions?
How would one do this?
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by Mr_B »

Hi Dalkill,

Sounds like a carb fault, I take it the engine was fitted with the old auxillaries, carb, starter, alternator, etc. If so, you may have to have the carb overhauled, often a worthwhile cost, but take it to a reputable specialist cause the hilux carb is not a standard run-of-the-mill carb, and often an unqualified chap stuffs it up even worst than it was before. It's possible the choke mech is getting stuck, between fast and med idle, this is common on an older carb(that needs attention)... On the R30,000 engine, that can't be... theres a new 4Y standing at Bellville Protea Toyota for R 13995.00, brand spanking new(excludes auxillaries...). R 14000 for the engine and maybe R16000 for Toyota to fit it! :lol:

Bretton
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Re: Revs - hunting

Post by SYRON CONVERSIONS »

Water in fuel
Sucking air in somewhere on intake side
Blocked air intake
Fuel filter dirty
Small filter under the needle and seat blocked
Faulty coil
1992 Slightly Modified Hilux, 2008 VW Caddy panelvan work, 2010 Isuzu 2.5 td bakkie for work, a pair of big 'balloons' as well hanging at the rear of my Hilux

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Re: Revs - hunting

Post by dalkill »

I confirmed with the previous owner that all axtra bits on the engine, distributor, starter, alternator, petrol pump all look new, and was fitted by toyota.

Hopefully it's still under warrentee cause they only have 12 month warrentee with it :shock:

Else I would like to start getting my hands dirty and fixing the prob myself. I love scratching around in engines, and this basic engine should be good place to learn. Not just gonna save me some cash (could cost more if I bugger it up - but I have to learn), but I also get to know the vehicle better - helps if you stuck in the bush.

I'm going to have the gas conversion kit installed sometime this week. This includes dyno. Lets see if they pickup anyhting, if not, then I'll prob be posting here again :oops:
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by dalkill »

I have just done a service on the lux, with new air + fuel filter, but it still does it.

Don't think it could be water in the fuel as I fill up the corolla at the same garge around the corner and that's going fine - so fine, that after I get into the corolla from the lux, it feels like I'm driving a merc :lol:

It seems to have a flat spot on the initial acceleration. When I let it idle, (at about 1000rpm - this too high??) and suddenly press on accelrator pedal, it has this falt spot initially then picks up revs and keeps it there. On the way to the gas fitment place, which I did not make to in time, the traffic was heavy, and pulling away in first I have to pull away in high revs to keep from stalling - sounded like my wife pulling away riding the clutch.

I noticed the one breather pipe from the tappet cover going to the top of the carb is a bit loose. Look like it was siliconed, but now it's loose again. Could this be the problem? Or can I check something else?
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by SYRON CONVERSIONS »

The breather pipe will not be the problem, there are so many items that can be the problem, maybe my friend Blommie would like to help out here and give some suggestions as wel.

Maybe you have an electrical problem and you are looking in the wrong place, somthing to do with the ignition.
1992 Slightly Modified Hilux, 2008 VW Caddy panelvan work, 2010 Isuzu 2.5 td bakkie for work, a pair of big 'balloons' as well hanging at the rear of my Hilux

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Re: Revs - hunting

Post by BenHur »

No that breather should not case your problem, to me it seems like your vacuum pipes are not routed properly and the timing is not correct. The accelerator pump in the carb can also cause a flat spot.

Idling at 1000RPM is also way to high, you can effectively idle at between 750 an 850 more that that is wasting a lot of fuel.
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Re: Revs - hunting

Post by dalkill »

is there anyone in Ct that can show me the diff between a breather pipe and a vacuum pipe / distributor and a dizzy :oops: and maybe show me to set the timing / ilding speed - 700rpm

I would like to become more intimate with this 4y, as I will be doing alot of driving where cell phone reception is not found - thus I need to know what to check IF she dies on me
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by Mr_B »

Hey Dalkill,

There's lots of us that can help! If you want to get the info from a real expert then Alan Venter(Hoppie) is your man, he has sorted my lux out on numerous occasions, very successfully. Let me know if you are interested and i'll pm you his contact details, his out in Brackenfell. Else I could also attempt to help you, I 've quite a bit of experience with the Nikki carb and have rebuilt mine twice. The 4Y vacuum pipes can be a nightmare! One of the reasons I am going EFI now!

Bretton
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Re: Revs - hunting

Post by dalkill »

thanks snipes

I have a very good machi I always take my cars to, but with this thing would like to get my hands dirty, because I like to mess aorund with engines, and to inform myself of it's ins and outs. If for example, I have been doing round offroading, and some pipe or switch loosens up, and the lux is not happy, I want to be able to know what makes it tick.

Could I come thru to you on Sat afternoon, then you can have a look and give me a few pointers. I'm in Goodwood, so it should not be too far.

I rescheduled the gas kit installation for Tuesday. THis includes a dyno.
Do you think it best I first sort out this problem before putting in the gas, or you think the dyno should sort it out?
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by SYRON CONVERSIONS »

the dyno will not sort anything out, you still need a mechanic to do the work. :wink:
1992 Slightly Modified Hilux, 2008 VW Caddy panelvan work, 2010 Isuzu 2.5 td bakkie for work, a pair of big 'balloons' as well hanging at the rear of my Hilux

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Re: Revs - hunting

Post by Mr_B »

Hi Dalkill,

I agree with Syron, dyno is not the answer. All the dyno tuners I have met want the engine running perfectly before tweaking. Ok I have re-read the whole thread, my gut feeling is that your lux has one of two possible problems:

1. Vacuum advance on wrong connection to carb. A common mistake on the Nikki Carb/4Y config is that mech's tend to switch the connection for the vacuum. I will post a pic showing the correct routing soon(I don't have time now)...

2. A very common fault is the accelerate pump jet... a worn piston seal/faulty linkage/missing reservoir ball. When you initially push the accelerator on most carb fed cars, a small jet of petrol is sprayed down the carb, giving the engine a boost. If this accelerator pump does not operate properly you will definitely have a horrible flatspot at low(1000 to 2000) RPM. Some carb rebuild guys forget to put the ball at the bottom of the accelerate pump jet reservior, the missing ball allows fuel to travel back to the float bowl instead to staying in the reservior. If this is the case I would strongly recommend a rebuild, do it yourself and do it properly. I have rebuilt my carb, it's not difficult, you just need to take care and take your time, else you could lose/misplace small parts.

I am not at home on Sat, a group of us are doing to Two Ocean's trail in Somerset West. We can meet on another occasion!!

Bretton
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Re: Revs - hunting

Post by SYRON CONVERSIONS »

And if you work on a carb, either get an old radio speaker which still has th magnet on the back, get one of the doctors metal tins that they use, put the magnet under the tin and then when you strip the carb, put all the parts in the tin, this will prevent you loosing any parts.

Or place a cloth on a table and put all the parts onto the cloth, this will also prevent the parts from rolling away.

Take a few pic's as you strip things if you are unsure, to this day, I still take pic's of various parts on the trucks when I strip things if I am unsure, sometimes the job has to wait for spares. And this can take a few days or even weeks.

You must remember that under the needle and seat there is a small sieve that can also be dirty and blocked.
1992 Slightly Modified Hilux, 2008 VW Caddy panelvan work, 2010 Isuzu 2.5 td bakkie for work, a pair of big 'balloons' as well hanging at the rear of my Hilux

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Re: Revs - hunting

Post by dalkill »

Thanks for all the advice guys

Was hoping to fix it myself, but for purposes of getting the job done, I think I will take it to the machie, since the LPG kit + dyno is happening on Tuesday - so she better be in tip top shape.

Will advise as the caue of the prob. My gut tells me it's a setting somewhere, as the carb looks brand new as all the other bits and pieces. according to the previous owner, it was all fitted by Toyota about 9000km ago.
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by dalkill »

My uncle had a look at the bakkie this weekend.
He kept it at about 2000rpm, and said the engine was cutting out. I checked the fuel in the fuel bowl, and this constant, so he said there was no fuel problem. Checked the houses to the carb, all seem to be in order.

While driving he could see the rev needle hop from 1500 to about 3500 rpm as we went up a hill and it struggled a bit. He then suggested the problem could b with the distributer, which he says is electronic.

Thus he suggested I take it to toyota, and have the distributor tested.
Will keep you posted.
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by Scorpion »

Good luck, mate! I hope it isn't the distributor, because Toyota quoted me R 7 000 for a new one! :evil: :evil: :evil:
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Re: Revs - hunting

Post by BenHur »

Save yourself a lot of bucks and rather take it to Alan (Hoppy) as Bretton suggested, I doubt if your dizzy is at fault
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Re: Revs - hunting

Post by Mr_B »

Ok, I agree with myself too... Alan will very quickly be able to see if it's dizzi related(which I doubt). Usually when an electronic dizzi packs up, it stops working altogether. I still think you may have a minor fault with the vacuum pipes/carb.

A faulty choke mech/linkage could also be to blame.

Bretton
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Re: Revs - hunting

Post by dalkill »

I took the lux for gas conversion, with the dodgy cutting out.
Asked the guy to do the best he can, as It was the only time I could get the bakkie to him.

He took of the dizzy, had "dizzy expert" look at it who reported it's new and nothing wrong with it. He then refitted, tightenend everything, dyno, and it seems to go 100% better. I can now pull away and cruise at lower than 2000rpm, without the engine wanting to cut out

I was hoping to report back something a bit more concrete, but that is all I have.
Maybe the experts here can make more on that :?:
2016 2.4GD6 SR D/C 4x4 (Oct 2022 - current) (Buraaq VI)
2007 d4d 3.0 D/C 4x4 (Mar 2016 - July 2022) (Buraaq V)
2003 Isuzu KB300 D/C 4x4 (May 2015 - Feb 2016) aka Buraaq IV
2000 hilux DC 2.7 4x4 (Jul 2011 - Sep 2012) aka Buraaq III
1999 RXI 20v (Nov 2009 - Jul 2011) aka Quicksilver
1990 hilux DC 2.2 4x4 (Jun 2008 - Jul 2011) aka Buraaq II
1997 corolla 160i GLE (Feb 2007 - Sep 2009) aka Green Goblin
1990 GLI twincam (still my fav rolla) (Oct 2005 - Mar 2007) aka Wit Blitz
Golf GTI 2.0 (temp insanity for 2months) (Jun 2005 - Aug 2005) aka A mistake
1993 hilux SC 2.2 4x4 (April 2003 - Sept 2005) aka Buraaq

TOYOTA IS MY LEWE
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Re: Revs - hunting

Post by Sven »

not that this would have been the problem but i had similar problems, with a weber,
cleaned out the little filter on the inlet of the carb(full of gunk) and went perfect again.

a different problem all together, slight jerking once in a while at a certain constant speed,
changed the branch manifold and sorted that problem out? decided on that cos on a 2 stroke
bike the expansion pipe controls the back pressure(dont know the correct term) and a badly
made manifold could disrupt the perfect flow. am i correct cos im not 100% sure, but it worked.
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