Weird Formula LS1 problem
Thread Starter
On The Tree
Joined: Aug 2009
Posts: 102
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Weird Formula LS1 problem Car is a 99 LS1 formula A4. Stock, except for hypertech programmer and a cutout. (I didn't program the hypertech, the car came that way) I should probably re tune it to stock, but i don't feel like spending the money at the moment...I know it will be expensive...
Anyway, the car is just acting weird. While accelerating sometimes, the car cuts out for a 1/2 sec and goes normal again. (Generally coming off of a turn) It seems like the fuel gets cut or something? It's strange..Although, at WOT the car is fine and has never done it. The only other issue with the car is that sometimes it bangs the rev limiter when going from 1st to 2nd. I'm thinking that might be the hypertech? How can i fix some of these issues? Any advice?
Thanks again.
Anyway, the car is just acting weird. While accelerating sometimes, the car cuts out for a 1/2 sec and goes normal again. (Generally coming off of a turn) It seems like the fuel gets cut or something? It's strange..Although, at WOT the car is fine and has never done it. The only other issue with the car is that sometimes it bangs the rev limiter when going from 1st to 2nd. I'm thinking that might be the hypertech? How can i fix some of these issues? Any advice?
Thanks again.
Teching In
Joined: Feb 2007
Posts: 5
Likes: 0
From: Ft. Lauderdale, FL
Your Throttle Position Sensor (TPS) may be giving a bad signal to your ECM. The resistive grid in your TPS may be a bit worn, you can not accurately test this without a graphing multimeter or oscilloscope. But you can try putting you car in a manual gear and slowly depressing the throttle while accelerating to find that certain point. If it is your TPS, the worn part of the grid is typically at the throttle angle where you set your cruse control, and you will have to replace the entire TPS.
Teching In
Joined: Feb 2007
Posts: 5
Likes: 0
From: Ft. Lauderdale, FL
The point that your throttle is depressed in relation to the throttle position sensor. If your TPS is worn in a certain area of the resistive grid it will send a false signal to your computer, making you computer think you just let off the throttle when really your at (ex. 70%) throttle. Which in turn cuts your fuel.
You would have to test it with a graphing multimeter to be sure though.
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Fuel filter and TPS are good things to check.
Problems that only show up in turns are sometimes caused by bad wires that are getting shifted around by the force of the turn.
Hopefully you find the problem before it comes to that.
Problems that only show up in turns are sometimes caused by bad wires that are getting shifted around by the force of the turn.
Hopefully you find the problem before it comes to that.
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Verdad Gallardo Your condition doesn't sound like a tune up, but it's good practice to pull a plug and take a look. I'd say #3 is probably the easiest.
You shouldn't have a problem finding a tuner in St Pete to start you off with the basics. The Florida section will point you the right way.
You shouldn't have a problem finding a tuner in St Pete to start you off with the basics. The Florida section will point you the right way.
