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Help me diagnose a possible caster angle issue
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04-14-2021, 02:24 PM | #1 |
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Help me diagnose a possible caster angle issue
Ever since I got my car I've had a slight pull to the right, tramlining, bump steer and wheel shake between 40-50mph, smooths out after that. Passenger front side tires had inner wear, similar to negative toe wear. I check tire pressure, balance, torqued lug nuts to spec, measured camber and toe, brake wear is even, all seems fine. My worry is that the caster angle may be off since the previous owner did indicate the car has been in an accident on the front passenger side. My question is, would bad caster angle on one side cause above symptoms? Or is it more inline with worn parts?
Under the hood, I noticed strut mount had the pin missing on both sides and was adjusted, more so on the passenger side than the driver side, possibly after the accident. But again, camber looks fine on both sides. Any help or insight is greatly appreciated.
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04-19-2021, 05:07 PM | #2 |
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Mileage? How did you measure your camber and toe? Did you check for any play with the control arms and tie rods?
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04-19-2021, 08:31 PM | #3 | |
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Best bet is probably going to an actual alignment place and getting it checked. Not sure how accurate my back yard mechanics measuring methods are.
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04-20-2021, 10:05 AM | #4 |
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I guess the first thing is, yes, caster could be causing the issue you're seeing. But it could also be a bunch of other things. My first guess is that you might have a bent strut if the camber at the wheel looks the same on each side but the bolts are set in a different orientation at the strut top.
Take the car to an alignment shop and have it checked. In particular, check the "included angle". It should be the same on each side. Its basically the angle between the strut and the wheel mounting face. If its off, it will indicate that your strut is bent. You will also be able to see caster in that measurement as well, and if the caster is dramatically off from side to side, it could be a strut bent in the fore-aft direction, or the tension arms being bent or worn. The tension arm controls the fore-aft location of the wheel, so if this part is bent/worn then the caster angle will be out of spec. Lastly, toe is another common culprit, though inner tire wear is generally an indication of toe out and you'd see it on both sides and the car would wander, rather than pulling. |
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04-20-2021, 11:14 PM | #5 | |
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04-21-2021, 09:31 AM | #6 |
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Wandering is basically random pulling in each direction, like it doesn't really want to go straight. A pull is consistent to one side, like you take your hands off the wheel and it steers right.
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04-21-2021, 02:40 PM | #7 | |
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With regard to the topic of this specific thread, I'm wondering after installing new tension arms and struts, what could be bent causing the offset caster? is it the subframe itself, or subframe mounting points for the tension arms? Or could it be the lower control arm (wishbone?) The lower rearward control arms (wishbones) on my car look to be identical and original to my car, and I haven't replaced those yet. I can't see any obvious distortion but it's hard to compare without removing and putting them side by side. The knuckle also looks fine. |
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04-23-2021, 07:38 AM | #8 | |
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Also, since your measurements were the same going from front to back of the tire that means you have ZERO toe, which exactly explains why you have inner tire wear. Again, go back, box the car off, and add some toe-in to each front wheel to offset the wear. Start with a couple 1/32" at each corner until you find the sweet spot to match your driving habits. As for pulling/wandering, not sure if I missed it but what are the conditions of the bushings, ball joints, etc. up front? Wear there could easily be causing random issues like this and with your mileage it would be best to swap them out regardless. |
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04-25-2021, 12:02 PM | #9 | |
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05-03-2021, 02:35 PM | #10 |
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So I took my car to get alignment diagnosed, the guy at the shop was hesitant to even look at my car saying that spacers are the culprit... Weird because I had issues before spacers and yes spacers possibly made it even worse. I told him all I want to know if my alignment is in spec. Just give me the damn numbers.
Last edited by MadDog89; 05-03-2021 at 08:11 PM.. |
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05-12-2021, 01:18 PM | #11 |
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Well, that puts the "could this be caster?" issue to bed.
Next up is getting front camber just a bit closer and adjusting toe all around. For camber up front, push the passenger side in as far as it will go and remeasure camber on both sides yourself. Should be very easy with the pin already gone. You've already got a good working knowledge on adjusting toe, so square the car, make a couple of adjustments (front and rear), and you should be good to go. Anything else related to vibration/wheel shake/etc. will likely be solved with a good road force balance. |
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05-19-2021, 11:41 AM | #12 | |
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