Originally Posted by Brotan3
Hey everyone. I just bought a 99 T/A the other day and so far I've come across a few issues that need attention. I'm doing my own research as well but figured I'd post here in case anyone has some insight.
The first issue is I get some surging on acceleration, usually when I hit about 40 mph if I'm on the pedal just enough to maintain speed or go a bit faster the engine seems to surge and the RPMs will go up and down as well as exhaust note. Again, only when I'm barely on it, if I open the throttle up a bit more it takes off like normal. I'm assuming this has something to do with either air or fuel delivery.
Do you have any error codes?
My guess would be the front 2 02 sensors, some can be finicky with LT headers. This will most definitely cause surging/jerking issues.
Second is it seems like right around the same time i get the surging my car vibrates and makes a sound almost like what you would get if you went over rumble strips. This is also on acceleration. Idk if it means anything but the car has been upgraded to 4:10 gears and I believe a somewhat upgraded transmission.
Likely exhaust related, probably exhaust hitting the underbody of the car or rubbing something.
The last one (for now) is a knock that I get when I tap the pedal. Kind of like You would when you rev match to downshift. It comes from the back somewhere under the backseat, possibly the diff. This one most likely won't get a solution on here but hey maybe someone else out there has experienced it.
You should never get a knock when rev matching...Dont know what you are talking about there.
The noise could be the exhaust hitting the floor boards like above, could be lose suspension pieces (torque arm,rear control arms,panhard bar) the drive shaft u joints, or could be play in the rear end.
Also, there's some pretty big tires on the back compared to the ones up front so the speedometer is way off. Is there a way to recalibrate without tuning it? I can only do so much with the tuner I have and writing different tire sizes isn't one of them.
No, you need a real tune, like hp tuners.
Mods that I know of are as followed: |
BBK SSI Intake
SLP Lid Intake
Possible mild cam
Full BMR Suspension (Extremely Stiff)
3 inch exhaust from headers back .
I've always been a WBody guy and I am New to the FBody world so I don't know too much about them, so any help is appreciated.
Did the previous owner give you any paper work or anything? Has the car been dyno tuned?