Few Issues Im Having

**edgy77** · 07-21-2016 03:45 PM

Alright, basically its pretty simple to sum up. The car has a knarly vacuum leak. -10 at idle stopped. and -20 while rolling in gear at any speed and any rpm if off the throttle. What does that mean? if its a consistent vacuum leak shouldn't it be the same across the board? Aswell, whenever the car sits for more the 2 minutes. It doesn't want to start, I have to give It gas, it sputters then finally runs fine. Its getting fuel cause soon there after, there's quite a bit of backfiring when letting off the throttle driving normally sometimes as in its running very rich. Then once I drive a little longer and the car warms up, the back firing stops. besides the normal stage 3 pops and bangs while doing pulls. Any help to steer me in the right direction for when I break into it tomorrow night?

**vavJETTAw36** · 07-21-2016 06:28 PM

Sounds like it's fuel or ignition related. Vacuum leaks only happen when the car is idling or off throttle. But then again could be a considerable boost leak.

First and foremost, have you scanned the car?

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**Trb1** · 07-21-2016 08:41 PM

Originally Posted by vavJETTAw36

Sounds like it's fuel or ignition related. Vacuum leaks only happen when the car is idling or off throttle. But then again could be a considerable boost leak.

First and foremost, have you scanned the car?

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Vacuum leaks are going to cause unmetered air to enter the system and cause issues in all situations.

Hard warm starts could be caused by a bad coolant temp sensor or a large vacuum/boost leak. Scan it first and then pressure test it. Guarantee you have a leak somewhere based on idle vac.