Strange wiggle when first push gas pedal and first let off it - S-10 Forum
 
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post #1 of 14 Old 01-28-2019, 01:46 PM Thread Starter
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Strange wiggle when first push gas pedal and first let off it

About 5 miles into my drive to work yesterday I noticed an odd little wiggle when I first press the gas pedal and then again when I let off. Does it every time and it doesnít matter if the wheels are turned or straight. I inspected the front end last night and found nothing out of place and honestly it almost feels more like itís doing it in the rear end but nothing appeared out of place there either although I did not go over it as thoroughly as the front as it was getting late. Could something in the diff be on its way out causing it? It only does it for a split second when the suspension first makes it move when accelerating and decelerating

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post #2 of 14 Old 01-29-2019, 01:58 AM Thread Starter
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And today on the way to work it started popping when I let out of the clutch and it’s definatelt in the front end. I can grab the tie rods and there is a very small amount of slop in the steering but it can’t be enough to make the little wiggle it does as it does it. It feels like something is moving a half inch or more and the slop is probably only .050 or so. When I get my tax return I’m going through the whole front end anyway but that’s atill a few weeks out
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post #3 of 14 Old 01-29-2019, 07:31 AM
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Re: Strange wiggle when first push gas pedal and first let off it

Look around the idler arm mounts and steering box mounts for any cracks in the frame. It can happen. Also take a look at your rag joint under the air filter housing. They can get sloppy when worn.
You might also be feeling the engine move if the mounts are bad. Set the parking brake and put some chocks in front of the front wheels and while standing alongside the truck have someone coordinated bring the rpms up around 1500-1800 and ease out the clutch in 1st and reverse.
Same as power braking an automatic. See if the engine moves off it's mounts. They are a known weak point.
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post #4 of 14 Old 01-29-2019, 02:32 PM Thread Starter
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Re: Strange wiggle when first push gas pedal and first let off it

Good ideas Iíll check them out after work tonight, if I can tolerate being out in the cold. Low 20ís tonight

Motor mounts seem like they would be a real pain in these trucks

I donít really feel it in the steering wheel much. It kind of feels like what you might imagine the front and rear ended coming badly misaligned for a split second, if that makes any sense
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post #5 of 14 Old 01-29-2019, 05:26 PM
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Re: Strange wiggle when first push gas pedal and first let off it

Quote:
Low 20ís tonight
Here in WI we'd call that a heat wave.
Tomorrow's forcast;
WEDNESDAY: Partly sunny and dangerously cold. Wind Chills to -50į.
HIGH: -13į
LOW: -30į

When they talk about the "Frozen Tundra" they aren't kidding. Local acronym is FFT
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post #6 of 14 Old 02-03-2019, 07:33 PM
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Re: Strange wiggle when first push gas pedal and first let off it

Do you have blocks in the rear? The first set of blocks I had broke one of the centering pins and every time I hit the gas it would dog track just a little and then go back when I let off.
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post #7 of 14 Old 02-05-2019, 02:04 PM Thread Starter
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Re: Strange wiggle when first push gas pedal and first let off it

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Do you have blocks in the rear? The first set of blocks I had broke one of the centering pins and every time I hit the gas it would dog track just a little and then go back when I let off.
Yep, 2Ē block in the rear, Iíll look into that.

The problem seems to have subsided a bit. Itís not popping on take off anymore and the wiggle is hardly noticeable. Iím sure it will come back. Itís almost time to start throwing a bunch of new parts on it so Iím sure Iíll finf it then
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post #8 of 14 Old 06-08-2019, 11:21 PM Thread Starter
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Re: Strange wiggle when first push gas pedal and first let off it

I think i May have accidentally stumbled upon the problem. It wasnít in the front end, since my op I have rebuilt the entire front end, except control arm bushings. While I was washing it the other day I unintentionally pushed hard on one of the rear tires and it the wheel and all moved in a little and made kind of a squishy sound. Same thing on the other side. Is there something inside the rear end that could cause this? I pulled the cover off today and the oil was ok and no big pieces or debris. Or is that movement ok?
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post #9 of 14 Old 06-08-2019, 11:43 PM
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Re: Strange wiggle when first push gas pedal and first let off it

Not sure I would describe it as squishy, but there is a little play in the C clips....not much...just a little.

Have you tried pulling the wheel, or just raising them off the floor and trying a push/pull on the wheel?

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post #10 of 14 Old 06-09-2019, 01:08 AM Thread Starter
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Re: Strange wiggle when first push gas pedal and first let off it

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Not sure I would describe it as squishy, but there is a little play in the C clips....not much...just a little.

Have you tried pulling the wheel, or just raising them off the floor and trying a push/pull on the wheel?
I thought I did not long after my op but thinking back on it I must not have or I definitely would have felt what I recently noticed. How much play is in the c clips (Iím a machinist so Iím good with small numbers as I assume it will be)? The weirdest thing is that sometimes it hardly does it at all but other times Iím worried Iíll get pulled over for suspected dui
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post #11 of 14 Old 06-09-2019, 01:19 AM
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Re: Strange wiggle when first push gas pedal and first let off it

I don't know how much play is acceptable, however, if the wiggle is enough to cause you that kind of concern, I'd start looking at suspension pieces. Are you lowered? Hollw blocks or solid? Are you running big and littles? I run 245-45-17 up front and 285-40-17 in the rear. they tend to grab at the worn places in the pavement...makes it pretty exciting at times.

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post #12 of 14 Old 06-24-2019, 01:38 PM Thread Starter
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Re: Strange wiggle when first push gas pedal and first let off it

Figured Iíd update if anyone else having this problem finds this thread. Turned out the ubolts on the passenger side were just loose enough to cause this problem. I couldnít see the wear marks before because I had left the wheels on and couldnít really see the top of the axle tube. This time I had the wheels off and saw right away where the axle had been moving under then u bolts about 3/8Ē. Tightened all 8 nuts and the movement when accelerating and decelerating is gone
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post #13 of 14 Old 06-24-2019, 03:34 PM
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Re: Strange wiggle when first push gas pedal and first let off it

That'll do it. Those things stretch a bunch, always make sure they are torqued down.
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post #14 of 14 Old 06-24-2019, 05:23 PM
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Quote:
Originally Posted by manbearpig View Post
That'll do it. Those things stretch a bunch, always make sure they are torqued down.
I replaced the bolts when I swapped 1 ton axles into my bronco. Ubolt instructions said to retorque after 50-100 miles. I always retorque after 100 miles on any suspension parts regardless of whether the instructions say to or not. Bolts stretch. It happens to be a reason you arent suppose to reuse ubolts or head bolts anymore. Most of the head bolts now days are torque to yield.
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