diff --git a/lib/postman-sandbox.js b/lib/postman-sandbox.js
index 907a5c45..bcc745db 100644
--- a/lib/postman-sandbox.js
+++ b/lib/postman-sandbox.js
@@ -146,9 +146,7 @@ class PostmanSandbox extends UniversalVM {
             this.emit('execution.result.' + id, new Error(BRIDGE_DISCONNECTING_ERROR_MESSAGE));
         });
 
-        setTimeout(() => {
-            this.disconnect();
-        }, 100);
+        this.disconnect();
     }
 }
 
diff --git a/lib/sandbox/execute-context.js b/lib/sandbox/execute-context.js
index 835e0d48..40aed288 100644
--- a/lib/sandbox/execute-context.js
+++ b/lib/sandbox/execute-context.js
@@ -50,13 +50,10 @@ module.exports = function (scope, code, execution, console, timers, pmapi, onAss
     });
 
     scope.exec(code, function (err) {
-        // we check if the execution went async by determining the timer queue length at this time
-        execution.return.async = (timers.queueLength() > 0);
-
-        // call this hook to perform any post script execution tasks
         legacy.finish(scope, pmapi, onAssertion);
-
         function complete () {
+            // call this hook to perform any post script execution tasks
+
             // if timers are running, we do not need to proceed with any logic of completing execution.
             // instead we wait for timer completion callback to fire
             if (execution.return.async) {
@@ -67,6 +64,6 @@ module.exports = function (scope, code, execution, console, timers, pmapi, onAss
             timers.terminate(err);
         }
 
-        setImmediate(complete);
+        timers.getWrappedTimer('setImmediate')(complete);
     });
 };
diff --git a/lib/sandbox/execute.js b/lib/sandbox/execute.js
index d2964bef..8278ebce 100644
--- a/lib/sandbox/execute.js
+++ b/lib/sandbox/execute.js
@@ -153,7 +153,7 @@ module.exports = function (bridge, glob) {
             execution.return.async = true;
         }, function (err, dnd) {
             // clear timeout tracking timer
-            waiting && (waiting = clearTimeout(waiting));
+            waiting && (waiting = timers.getWrappedTimer('clearTimeout')(waiting));
 
             // do not allow any more timers
             if (timers) {
@@ -180,7 +180,7 @@ module.exports = function (bridge, glob) {
 
         // if a timeout is set, we must ensure that all pending timers are cleared and an execution timeout event is
         // triggered.
-        _.isFinite(options.timeout) && (waiting = setTimeout(function () {
+        _.isFinite(options.timeout) && (waiting = timers.getWrappedTimer('setTimeout')(function () {
             timers.terminate(new Error('sandbox: ' +
                 (execution.return.async ? 'asynchronous' : 'synchronous') + ' script execution timeout'));
         }, options.timeout));
diff --git a/lib/sandbox/timers.js b/lib/sandbox/timers.js
index b408cd02..bc3e78de 100644
--- a/lib/sandbox/timers.js
+++ b/lib/sandbox/timers.js
@@ -114,7 +114,6 @@ function Timerz (delegations, onError, onAnyTimerStart, onAllTimerEnd) {
         total = 0, // accumulator to keep track of total timers
         pending = 0, // counters to keep track of running timers
         sealed = false, // flag that stops all new timer additions
-        wentAsync = false,
         computeTimerEvents;
 
     // do special handling to enable emulation of immediate timers in hosts that lacks them
@@ -166,7 +165,7 @@ function Timerz (delegations, onError, onAnyTimerStart, onAllTimerEnd) {
         }
 
         if (pending === 0 && computeTimerEvents.started) {
-            setImmediate(maybeEndAllTimers);
+            timers.setImmediate(maybeEndAllTimers);
         }
 
         if (pending > 0 && !computeTimerEvents.started) {
@@ -191,8 +190,6 @@ function Timerz (delegations, onError, onAnyTimerStart, onAllTimerEnd) {
                 args = arrayProtoSlice.call(arguments);
 
             args[0] = function () {
-                wentAsync = true; // mark that we did go async once. this will ensure we do not pass erroneous events
-
                 // call the actual callback with a dummy context
                 try { callback.apply(dummyContext, staticTimerFunctions[name] ? arguments : null); }
                 catch (e) { onError && onError(e); }
@@ -211,9 +208,6 @@ function Timerz (delegations, onError, onAnyTimerStart, onAllTimerEnd) {
                 }
             };
 
-            // for static timers
-            staticTimerFunctions[name] && (wentAsync = true);
-
             // call the underlying timer function and keep a track of its irq
             running[id] = timers[('set' + name)].apply(this, args);
             args = null; // precaution
@@ -245,7 +239,7 @@ function Timerz (delegations, onError, onAnyTimerStart, onAllTimerEnd) {
             catch (e) { onError(e); }
 
             // decrement counters and call the clearing timer function
-            computeTimerEvents(-1, !wentAsync);
+            computeTimerEvents(-1);
 
             args = underLyingId = null; // just a precaution
         };
@@ -272,7 +266,6 @@ function Timerz (delegations, onError, onAnyTimerStart, onAllTimerEnd) {
         }
     }.bind(this));
 
-
     /**
      * @memberof Timerz.prototype
      * @returns {Number}
@@ -281,6 +274,10 @@ function Timerz (delegations, onError, onAnyTimerStart, onAllTimerEnd) {
         return pending;
     };
 
+    this.getWrappedTimer = function (fnName) {
+        return timers[fnName];
+    };
+
     /**
      * @memberof Timerz.prototype
      */
diff --git a/test/unit/sandbox-timers.test.js b/test/unit/sandbox-timers.test.js
index 283d7462..7a8fd1fa 100644
--- a/test/unit/sandbox-timers.test.js
+++ b/test/unit/sandbox-timers.test.js
@@ -59,7 +59,7 @@ describe('timers inside sandbox', function () {
 
             expect(err).to.be.null;
             expect(res).to.nested.include({
-                'return.async': false
+                'return.async': true
             });
 
             // we wait for a while to ensure that the timeout was actually cleared.
@@ -114,7 +114,7 @@ describe('timers inside sandbox', function () {
 
             expect(err).to.be.null;
             expect(res).to.nested.include({
-                'return.async': false
+                'return.async': true
             });
 
             // we wait for a while to ensure that the timeout was actually cleared.