engine 'knock' on start up - Saab 9-5 Bulletin Board - Saabnet.com
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engine 'knock' on start up
Posted by three_jeeps [Email] (more from three_jeeps) on Sun, 4 Sep 2016 20:08:17
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For some time now (6 - 12 months now - I hardly drive the car), there is what sounds like a single 'thud' or 'pop' under the hood when the engine starts. I think this may be related to another 'under the hood' sound - the engine seems louder under load, and shudders when I put on the A/C. I figure the motor mounts are shot at 120K miles and just received a new set and will install them shortly.
So, is this 'pop' sound on start up related to the motor mounts or something else? It sorta sound like a the engine gets an extra shot of fuel when starting and it causes the engine to 'explode' and burn the extra shot of fuel, then immediately settles down an runs normally.
Thoughts of what the issue could be?
Thanks
J
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