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More 020 fun*Solved,was not the tranny*
by
srgtlord
on 15 Sep, 2014 10:13
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Soooo very recently I have been having an issue with my 85 golf "bucking" when I first accelerate in second and third gear. At first I figured it was just normal wear and tear and I could ignore it, but it seems this "bucking" is getting worse. This ONLY occurs when I accelerate in second and third gear. Ill check the gear oil level tonight... but is there anything else it could possibly be? Could it be worn gears?
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#1
by
ORCoaster
on 15 Sep, 2014 14:52
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At what RPMs are upshifts being accomplished? What happens if you try shifting later by 500 RPMs? Could be a fuel delivery problem or just lugging it.
Worn gears? I don't think so. That is usually an issue with taking foot off the throttle not on.
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#2
by
srgtlord
on 15 Sep, 2014 21:26
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I will add this is not an issue of lugging, RPM's are well past 500 as I drive it like I stole it
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#3
by
ORCoaster
on 15 Sep, 2014 23:31
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OK, we have established the fact that it is bucking and jerking around at higher not lower RPMs. So IP not on solid? Such that when you come down in RPMs from the lower gear it sort of rattles around some with the timing belt or engine vibrations and gets all wonko. I am thinking of what happens to the IP at idle if you have that lower bolt loose like at timing time. You can get the pump to find a sweet spot at idle and you tighten the one bolt at the alternator side and just before you get the socket wiggled down and on the lower bolt to tighten it the RPMs drop down as the pump starts to shake a bit.
Because the car is under a load any kind of fuel miss would potentially lead the engine to jerk and buck. Once you get a few more RPMs into the whole upshift does it pull OK or is it bumping along all the while you are accelerating? Like a miss on a sparker?
Nothing loose like the back transmission support? OR a broken side mount? I have had that happen on the timing belt side. That is the more involved one to change so look it over real good and jerk it around rather than being jerked.
All I can think of for now. Keep poking at it.
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#4
by
CRSMP5
on 17 Sep, 2014 09:51
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I doubt it in tranny... If 1 & 2 or 3 & 4 or 5th... Ok... But 2 & 3 are different shafts... One loads main shaft, other loads pinionon
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#5
by
fatmobile
on 18 Sep, 2014 14:39
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Check the bolts holding the IP on,.. especially the bolts holding the bracket to the block, behind the pump.
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#6
by
Blocksmith
on 24 Sep, 2014 23:40
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I would be interested in what you find--my rabbit would buck
very badly after pretty much every shift before I replaced the motor with a refreshed one. It got so bad it felt and sounded like the engine was going to jump out of the engine bay. Same four speed that was in it, but an ME motor, before I yanked it out. Can't recall if I left the original ME clutch on it or not. Probably did.
Check the bolts holding the IP on,.. especially the bolts holding the bracket to the block, behind the pump.
Yeah, definitely check all your IP bracket mounting bolts. My brother's 1.6 swapped cabriolet had issues with intermittent bucking at certain rpms, turns out I should have used thread locker on
all the bolts...
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#7
by
srgtlord
on 31 Oct, 2014 08:54
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I never did find anything out of the ordinary. I am thinking its about time for me to change out the el-cheapo fuel filter.....
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#8
by
air-cooled or diesel
on 31 Oct, 2014 18:19
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an el-cheapo fuel filter can possibly do this, use a good one its your 'life line' that and air filter
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#9
by
iamdieselnutmechanic
on 13 Dec, 2014 00:34
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an el-cheapo fuel filter can possibly do this, use a good one its your 'life line' that and air filter
I had very similar situations back when my car was a 1.6D, it would rev up fine, drive fine.. but sustain a higher rpm and it would buck as though you turned the key off. Fuel filter was old and plugged.
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#10
by
srgtlord
on 13 Dec, 2014 21:40
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Figured out the problem...but unfortunately it was on my way to work.... The 3 bolts holding the serpentine belt setup to the 1.6d block all had snapped.
Now here is my theory on the matter. Im guessing the bolts somehow worked themselves loose and were causing the alternator bracket to to rock back and forth causing the bucking sensation at low speeds. As the bolts loosened more the bucking increased until eventually all the bolts snapped from the constant back and forth tension.....Now today with the new bolts on and locktite applied, the bucking is gone and the chance of the bolts loosening up again is greatly reduced.
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#11
by
burn_your_money
on 14 Dec, 2014 12:28
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Vw says those are all one time use bolts. Glad you solved it.
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#12
by
libbydiesel
on 14 Dec, 2014 13:25
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The 3 bolts holding the serpentine belt setup to the 1.6d block all had snapped.
Im guessing the bolts somehow worked themselves loose and were causing the alternator bracket to to rock back and forth causing the bucking sensation at low speeds.
I'd guess that they worked loose because there are supposed to be 4 bolts holding the serp bracket to the block. When I have installed the serp setup on the 1.6, I have added the 4th mounting point by welding a bracket onto the injection pump bracket.
The extra hole is slotted to allow pump bracket adjustment for belt tracking.