Backfire at startup

[cmw2616]

Lately I have had troubles starting my car, and it is getting worse it seems. I will turn the key and the starter motor is turning the flywheel and i can hear noise coming from my exhaust, but it won't turn over all the way. On the occasion for seem reason i can start my car, it bucks under acceleration and has no power. Today i tried to start the car and it just backfired and would not start. Recently i have replaced the fuel filter, plugs(NGK's), battery and i have no clue what is causing this.

 

[AlaskanDsm]

I would start with a full boost leak test. boost leaks can cause some issues. My car used to have problems starting becasue the o-rings on the injectors were toast and leaking a lot.

IC Pipe Tester

I would start the test at the TB and use a spray bottle with soapy water and spray down EVERYTHING and look for bubbles as well as listen for any leaking air. If you don't have a boost gauge to verify that the intake is holding pressure that is ok, just be very thorough withe the visual inspection. if you don't have any leaks at the TB, then hook it up to the intake side of the turbo and repeat the process.

 

[rlacasse1]

I agree. Something with no reading the correct amount of air. Boost leaks, MAF unplugged, something along those lines.

 

[cmw2616]

Alriight well I found a boost leak... only problem now is that i have no idea what part it is that is leaking. I went to autozone and as usual they did not help really with the situation. All I know about the part is it has this number on it
K5T439881919. It hangs off the firewall by the master cylinder and has what should be three hoses and a connector coming off of it( in my case the third one was broken off amd taped off).

 

[haswesley]

Backfiring on startup does not seem to be a symptom from boost leak. Boost leak is only a problem when you are moving down the road and under boost. So, it seems to me a timing problem. Hard starting, noises from the exhaust and backfiring all point to a timing problem. Check your timing, including ignition timing w/ a timing light.