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Intake "Pop" on startup

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Old 08-03-2012, 02:23 PM   #1
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Intake "Pop" on startup

Hi everyone

got a 95 sonoma 2.2.. 10,000 miles ago i put on a brand new cylinder head (old one was cracked), timing chain and tensioner. recently when i go to start the truck, warm or cold start, it pops through the intake. it fires up and runs great after that, i don't get it. no loss of power, no smoke or anything. when i did the head, i cleaned the egr and injectors, new o-rings around injectors, new gaskets everywhere, new IAC valve, new plugs, wires, etc. i followed the head installation procedure and torquing specs in the chiltons to a T. the truck has 192,000 miles on it. any additional questions i can answer about the truck just let me know. i appreciate everyone's input!
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Old 08-03-2012, 07:02 PM   #2
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Re: Intake "Pop" on startup

You might have a leaking injector.
Old 08-04-2012, 08:29 AM   #3
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Re: Intake "Pop" on startup

Since your engine repairs were 10,000 miles ago and the issue recently occurred, the list of what you did is a bit of a Red Herring.
The first thing that comes to mind when you mention intake popping is lean mixture,but you didnt list the long and short term fuel trim data. I would expect that monitoring the oxygen sensor voltage during the popping, would provide useful information.
Another piece of useful information would be the fuel pressure during the popping compared to the fuel pressure when the popping stops.
A lot of guys here seem to have coil issues, and repeat coil issues if they use aftermarket coils. I doubt a popping would be caused by a coil, but it wouldnt hurt to spray them down with a fine water mist and watch for arcing.
Old 08-06-2012, 10:12 AM   #4
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Re: Intake "Pop" on startup

thank you for the suggestions fellas. i'll certainly check out the coils. the odd thing about the popping is that some days it will happen a couple times. others, it starts up just fine all day long. eventually i'll find the culprit!
Old 08-08-2012, 01:36 PM   #5
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Re: Intake "Pop" on startup

try turning the key and wait for the pump to stop priming before starting and see what happens
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