Backfire on cold start?

[matthewr87]

Something odd happened yesterday and I'm not sure if it is normal or if I should be concerned. When I cold started the car I heard a loud bang from the exhaust a second or so after starting; it sounded like a backfire to me. Everything operated smoothly thereafter. Anyone ever experience this? Thanks!

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[68Stang]

Interesting. I've never had that happen.
Following!

 

[Cobra Jet]

A backfire is usually caused by unburnt fuel in the exhaust system, which can be caused by a few things:

Bent valves or valves not sealing properly
Ignition/timing sequence off
Lean Fuel/Air mixture
Rich Fuel/Air mixture

Have you checked the timing system per the TSB (and why isn't that thread a sticky in both this and the GT500 forum)?

Here's the GT350 Timing Chain TSB thread if you have not seen it:
https://www.mustang6g.com/forums/threads/tsb-for-secondary-cam-chain-tensioner.158799/

Here's a similar thread in the GT500 sub-forum:
https://www.mustang6g.com/forums/th...hain-tensioner-service-guide-attached.158780/

 

[J. Kidd]

Possible leaking injector adding fuel to a cylinder causing the backfire. Wouldn't necessarily notice it on a warm start since the car had been running and fuel hadn't had time to pool in the cylinder...and otherwise would drive relatively fine. Just a guess on my end, though...

 

[matthewr87]

Hasn't happened since. Strange. I do recall that I pumped the clutch a few times after I turned it off the time before it backfired. Perhaps that contributed to it. Doesn't pushing the clutch in prime the fuel pump?

 

[NoXiDe]

Hasn't happened since. Strange. I do recall that I pumped the clutch a few times after I turned it off the time before it backfired. Perhaps that contributed to it. Doesn't pushing the clutch in prime the fuel pump?

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