Delete chosen file from a list and subtract from the total value - Ionic

Question

I’m developing an app with Ionic 3 and Firebase. I am facing problems, because it is not decreasing the value of the product(chosen) of the total. Always subtract the last value informed. Follows the code :

deleteProduto(element) {
 if(this.vetCarrinho.length > 1){
   this.vetCarrinho.splice(this.vetCarrinho.indexOf(element), 1); 
   this.acum = (this.acum - this.valTot); 
   this.pedido.total = element; 

save function :

irParaCarrinho(element) {  
element = this.pedido.carrinho;    

this.vetCarrinho.push(element);  
console.log(this.vetCarrinho);
this.pedido.carrinho = this.vetCarrinho;

for (let i = 0; i < this.vetCarrinho.length; i++) {
    this.acumulador = this.valTot;       
  }    
  this.acum += this.acumulador;
  this.pedido.total = this.acum;
  this.desabilitar = true;