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frscke1, pjfroncz, Wedgy
Total Likes: 15
Original Post (Thread Starter)
1993 G20 4.3 V6 vibration when idling in gear #799283 12/04/2022 10:51 PM
by pjfroncz
pjfroncz
My van has a significant vibration when idling in drive or reverse. There's a little while idling in park or in neutral, but much worse when in gear. And only when idling - give her some gas and it smooths out.

Just spent the weekend replacing both motor mounts and the transmission mount (all aftermarket) but unfortunately the vibration is still there...

Any thoughts on what I should try next? Or just accept that I'm getting a free chair massage at red lights?...

I should also say that the vibration itself is very consistent. Not bouncing around like I would assume a rough idle would.
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Re: 1993 G20 4.3 V6 vibration when idling in gear #799287 Dec 5th a 12:33 AM
by CatFish
CatFish
Some low cost thoughts:
Check for a stored code.

Check the PCV valve and tubing for clogging, leaks or poor operation.

Check the throttle linkage for smooth operation and closure without binding. Also you'll need to check that the throttle and TPS are adjusted properly. The TPS should read less than 1.25 volts with the throttle closed. If the throttle stop has been messed with in the past it could be off.

A quick check for any small vacuum leaks using some starting fluid would be easy and cheap.

Other thoughts:
Does the engine idle change or smooth out with the AC turned on? The module should raise the idle slightly when the compressor is engaged. If not then you may have a communication problem with the AC control and the module.

You might want to remove the IAC and check it for proper operation and cleanliness. (The internet can tell you how to properly set it for a reinstall).

A leaking injector can cause a rich idle and can be hard to spot if it's only a slight leak.

Also know that the 4.3 V6 engine is not a smooth idling engine anyway. An internet search will show you quite a bit of info and a search of some of the S10 forums will reveal many threads on the subject.

My2%
3 members like this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799286 Dec 5th a 12:31 AM
by jcd74
jcd74
There are three versions of the 4.3, the later had the balance shaft. If you have plastic valve covers there is a good chance you have the stronger odd fire engine. Look up what you have. Check your balancer like frscke1 said, remember if the balancer is external balance the outer ring can slip and be out of place and be out of balance. If you have the balance shaft engine, the shaft may have jumped a tooth. GM used nylon gears back then for noise reduction. Back in the 80's many cars went to the boneyard for broken gears at 75k on the clock. The other thing to look for is the balance weight on the flexplate, it is spot welded and can break off. If you have the odd fire engine you may need a timing chain set. Of all the stupid things make sure you're running on all cylinders. Plugs, wires, cap, does 93 have the fuel injector spider? Are you getting fuel to every cylinder?
2 members like this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799297 Dec 5th a 12:37 PM
by Astrocreep66
Astrocreep66
Both early Astros I have shake, I don't pay much attention to it anymore..lol
2 members like this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799284 Dec 4th a 11:01 PM
by frscke1
frscke1
Harmonic balancer ...
1 member likes this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799291 Dec 5th a 01:49 AM
by frscke1
frscke1
Haynes manuels are basic what you need is a Factory Service Manuel

Amazon has them in the auto section
1 member likes this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799312 Dec 5th a 08:00 PM
by frscke1
frscke1
thats quite a bit of wobble and it gets worse over time ...

Maybe the bearing on the water pump is failing



1 member likes this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799535 Dec 11th a 11:54 PM
by frscke1
frscke1
Maybe ???


https://www.vanning.com/threads/ubbthreads.php/topics/799534/re-engine-vibration.html#Post799534
1 member likes this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799570 Dec 12th a 12:49 PM
by Astrocreep66
Astrocreep66
4.3 .. enough said, I have 3 and I call them Magic Fingers...lol
1 member likes this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799311 Dec 5th a 06:01 PM
by pjfroncz
pjfroncz
So I captured a video of the harmonic balancer while idling in park (doesn't vibrate as bad as when in drive, but some still there). Is this level of wobbling concerning? Can really see it in the shadow cast by the balancer.

https://youtube.com/shorts/72Zripj3fxk?feature=share
1 member likes this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799780 Dec 17th a 04:14 AM
by frscke1
frscke1
Id Mark the drive shaft before removing ... what you say sounds simple . drop the drive shaft .. put the tranny on a rolling lift .. but as you say there's always somthin ...

good luck on your endever ... do it right or do it twice .. I live by that.
1 member likes this
Re: 1993 G20 4.3 V6 vibration when idling in gear #799782 Dec 17th a 04:37 AM
by CatFish
CatFish
Removing the dust cover, removing the converter bolts and relocating the converter to flexplate is a simple enough job. Be careful not to push the converter back into the trans as you might disturb the front pump seal. Mark them first in case you need to return them back like they were.
1 member likes this
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