40+mph car shakes violently with light gas
#1
40+mph car shakes violently with light gas
I can't say anything has happened to my car recently other than an oil change. I was driving back from class going up a slight incline and when my rpms got to 1500ish in OD everything started shaking. I first thought engine mounts but that doesn't fit, the car loses power, feels sluggish, back fires, and runs like crap. If I accelerate from a stop it pretty much drives the same as normal but if I go about 40-50 mph and tap it then I get the same problem, this also happens if I switch the tranny to D but it's not quite as noticeable. If I put the car in park and rev it then nothing happens, the car sounds smooth as butter. I removed my SLP mass air to see if that was the issue but the problem persisted. I'm kinda scared this may be a transmission issue but i'm hoping it's just some weird electrical issue. What do you all recommend I try next?
#4
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Could be a lot of things, need some more info to troubleshoot.
Any SES codes?
Bad gas?
When was your last tune up?
o2 sensors?
VAccum leak
Does it do it before its warmed to OT?
TPS sensor? (I had a bad tps do really funny things on a lt1 car, it messed up the trannys mind...easy fix)
Any SES codes?
Bad gas?
When was your last tune up?
o2 sensors?
VAccum leak
Does it do it before its warmed to OT?
TPS sensor? (I had a bad tps do really funny things on a lt1 car, it messed up the trannys mind...easy fix)
#5
Could be a lot of things, need some more info to troubleshoot.
Any SES codes? not curently
Bad gas? Shell gas
When was your last tune up? spark plugs could use a change, tranny fluid changed within 30k, radiator flush too, oil every 3k,
o2 sensors? Po138 has occurred before and kicks in a SES light every once in a while but has never made it do this shake
VAccum leak? don't hear leaks but this is a good suggestion
Does it do it before its warmed to OT? does it during both
TPS sensor? (I had a bad tps do really funny things on a lt1 car, it messed up the trannys mind...easy fix) dunno what a TPS sensor is
Any SES codes? not curently
Bad gas? Shell gas
When was your last tune up? spark plugs could use a change, tranny fluid changed within 30k, radiator flush too, oil every 3k,
o2 sensors? Po138 has occurred before and kicks in a SES light every once in a while but has never made it do this shake
VAccum leak? don't hear leaks but this is a good suggestion
Does it do it before its warmed to OT? does it during both
TPS sensor? (I had a bad tps do really funny things on a lt1 car, it messed up the trannys mind...easy fix) dunno what a TPS sensor is
#6
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Are you still using the factory converter? If not you could have a PWM shudder if you did not install a pwm eliminator valve. Also even with the factory converter the valvebody has a valve that gets messed up and sticks causing tcc shudder. If the shudder is only happening when the car is going into OD which is what it sounds like I would bet its internal transmission or converter related.
#7
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Are you still using the factory converter? If not you could have a PWM shudder if you did not install a pwm eliminator valve. Also even with the factory converter the valvebody has a valve that gets messed up and sticks causing tcc shudder. If the shudder is only happening when the car is going into OD which is what it sounds like I would bet its internal transmission or converter related.
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#9
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Is it more like a bucking and jerking when holding the throttle open lightly? I have a similar issue Im still diagnosing. i got lean o2 code from 1 02. Im still trying to narrow it down to exhaust leak, failed cat or bad 02. Probably didnt help much but was more curious as to what specifically is happening.
#11
Are you still using the factory converter? If not you could have a PWM shudder if you did not install a pwm eliminator valve. Also even with the factory converter the valvebody has a valve that gets messed up and sticks causing tcc shudder. If the shudder is only happening when the car is going into OD which is what it sounds like I would bet its internal transmission or converter related.
factory converter, it shudders in OD and D
#12
Is it more like a bucking and jerking when holding the throttle open lightly? I have a similar issue Im still diagnosing. i got lean o2 code from 1 02. Im still trying to narrow it down to exhaust leak, failed cat or bad 02. Probably didnt help much but was more curious as to what specifically is happening.