this bucking car is killin me
#1
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this bucking car is killin me
I just picked up a 95 sc400 the other day and it has it's share of issues. There's a hefty leak which is another thread and a REALLY annoying bucking that the car has been doin for the last few days.
the bucking actually began when I was sitting still in Drive w/ my foot on the brake I could feel the engine buck, but the RPMS stay pretty even (like it wouldn't try to die)
then progressively more and more during acceleration it would buck short and quick over and over then it would come out of it and ride ok then buck a few more times at really any speed.
After this problem began, I have:
added fuel treatment / cleaner to empty tank then filled up w/ 93 Octane
Changed the plugs (one was particularly orange/corroded in the plug well)
reset the ecu
replaced PCV valve
replaced three cracked vac hoses (though for sure that was it)
adjusted TPS as mentioned in another topic
Now after all of these things
the problem I THOUGHT was fixed...it wasn't doing at all once I put everything back together and drove to work (long drive.)
well as I slowed down at a toll booth i felt it buck once and I noticed a CEL but it went away when I hit the gas...then again at some point when I was accelerating lightly I felt it twice quickly and noticed an intermittent check engine light a few more times primarily when either braking or decelerating. Now it doesn't buck when I'm sitting still though at least.
I was thinking misfire (and still maybe am) but wouldn't I be smelling some unburnt fuel? Would bad battery/alternator and weak spark maybe do it? Any possibility of torque converter? (hope not!)
Any idears? Thanks
the bucking actually began when I was sitting still in Drive w/ my foot on the brake I could feel the engine buck, but the RPMS stay pretty even (like it wouldn't try to die)
then progressively more and more during acceleration it would buck short and quick over and over then it would come out of it and ride ok then buck a few more times at really any speed.
After this problem began, I have:
added fuel treatment / cleaner to empty tank then filled up w/ 93 Octane
Changed the plugs (one was particularly orange/corroded in the plug well)
reset the ecu
replaced PCV valve
replaced three cracked vac hoses (though for sure that was it)
adjusted TPS as mentioned in another topic
Now after all of these things
the problem I THOUGHT was fixed...it wasn't doing at all once I put everything back together and drove to work (long drive.)
well as I slowed down at a toll booth i felt it buck once and I noticed a CEL but it went away when I hit the gas...then again at some point when I was accelerating lightly I felt it twice quickly and noticed an intermittent check engine light a few more times primarily when either braking or decelerating. Now it doesn't buck when I'm sitting still though at least.
I was thinking misfire (and still maybe am) but wouldn't I be smelling some unburnt fuel? Would bad battery/alternator and weak spark maybe do it? Any possibility of torque converter? (hope not!)
Any idears? Thanks
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#11
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I used to have this mysterious bucking/jerking. I took it in for maintenance and I think it helped this problem. I still got a little bucking but less extreme.
Now, there's some things I've noticed:
1.) It seemed to buck especially when the engine has been cold or just started up. When the engine was completely warmed up, I think it bucked a lot less.
2.) My bucking seemed to happen always when I would get into what I'm guessing is the 3rd gear (Auto) at 40 MPH.
Now, there's some things I've noticed:
1.) It seemed to buck especially when the engine has been cold or just started up. When the engine was completely warmed up, I think it bucked a lot less.
2.) My bucking seemed to happen always when I would get into what I'm guessing is the 3rd gear (Auto) at 40 MPH.
#12
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I used to have this mysterious bucking/jerking. I took it in for maintenance and I think it helped this problem. I still got a little bucking but less extreme.
Now, there's some things I've noticed:
1.) It seemed to buck especially when the engine has been cold or just started up. When the engine was completely warmed up, I think it bucked a lot less.
2.) My bucking seemed to happen always when I would get into what I'm guessing is the 3rd gear (Auto) at 40 MPH.
Now, there's some things I've noticed:
1.) It seemed to buck especially when the engine has been cold or just started up. When the engine was completely warmed up, I think it bucked a lot less.
2.) My bucking seemed to happen always when I would get into what I'm guessing is the 3rd gear (Auto) at 40 MPH.
I have the same issues as many of you. After doing a full maintenance of belts, dist cap, pulleys, cap, and seals, my car has been running smoothly but about 3 weeks ago, my car started also bucking seriously, even at idle(or misfiring, or whatever). Its only at 130k. My mechanic started working at it and began to use cleaners on my fuel injectors and gas tank. That helped about half of the vibrations. Then replaced spark plugs with NGK iridiums and spark plug wires. That helped pretty much 95% of the vibrations. But it is still not perfect the way it used to be a month ago. I am sort of disappointed.
#13
Lead Lap
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I have the same issues as many of you. After doing a full maintenance of belts, dist cap, pulleys, cap, and seals, my car has been running smoothly but about 3 weeks ago, my car started also bucking seriously, even at idle(or misfiring, or whatever). Its only at 130k. My mechanic started working at it and began to use cleaners on my fuel injectors and gas tank. That helped about half of the vibrations. Then replaced spark plugs with NGK iridiums and spark plug wires. That helped pretty much 95% of the vibrations. But it is still not perfect the way it used to be a month ago. I am sort of disappointed.
#14
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