Conflict servo and motor

Using Arduino Programming Questions
1

Hi,
I am doing a project that uses a PING))) sensor with a servo and 2 DC motor wheels. I reached a level where the motors and the servo do not work together. I read all articles and tried all solutions but nothing works also, the motors are on pins 4 to 7 and not 9 or 10 which means when the servo library disables pins 9 and 10 the motors should not be affected but still the motors aren't working even if i detach the servo.
Any suggestion or advice please.
Thank you

2

Any suggestion or advice please.

Yes, follow the advice in read this before posting a programming question and upload your code.

Only 2 of the pins 4 to 7 can output PWM but without your code we don't know what you are using them for.

3 
// Servo Library
#include <Servo.h>  
#define Left 0
#define Right 1
int Array[90];
Servo servo1;

void setup() {
  Serial.begin(115200);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(7, OUTPUT);  
  servo1.attach(9);
}

void loop()
{
  int increment = 0;
  int Max = 0;
  int position;
  long cm;

  for(position = 0; position < 180; position += 2)
  {
    servo1.write(position);  // Move to next position
	
	//Here the PING))) returns the distance called cm
 
    Array[increment] = cm;
	increment ++;
}   
   //Returns the Index of the Max value in the table
    Max = maximum(Array, 90);

    drive(Left, 1, 255);
    drive(Right, 1, 255);
    delay(15*Max);  // Motors spin for Max/2 cm equivalent to 15Max ms
    drive(Left, 0, 0);
    drive(Right, 0, 0);
}

void drive(byte motor, byte dir, byte spd)
{  
  if (motor == Left){
      digitalWrite(4, dir);
      analogWrite(5, spd);
    }   
  else if (motor == Right){
      digitalWrite(7, dir);
      analogWrite(6, spd);
    }  
}
4

Have you posted all your code ? The code posted fails to compile at
    Max = maximum(Array, 90);for me.

'maximum' was not declared in this scope

How are the motors and the servo powered ?