 Popping on deceleration, What can cause it? |
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| PDXMike |
 Jun 3 2012, 08:52 PM
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#1
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Slowly Learning  Group: Members Posts: 111 Joined: 20-December 10 From: Portland, OR Member No.: 12,501 Region Association: Pacific Northwest  |
1.8 L-Jet, new vacuum hoses. The car runs pretty well but pops a lot on decel. It will pop when just spinning down, and makes a LOT of noise when engine braking. I had leaks at the exhaust gaskets at the Monza mufflers, but I fixed those with no improvement. I don't see evidence of leaks anywhere else in the exhaust.
This isn't backfiring, just annoying pops and blats. Before I start digging deeper into the exhaust, are there other things that could cause this? |
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| karnak |
Jun 3 2012, 10:03 PM
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#2
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Newbie Group: Members Posts: 11 Joined: 22-August 10 From: Abbotsford, BC, Canada Member No.: 12,090 Region Association: Canada |
QUOTE(PDXMike @ Jun 3 2012, 06:52 PM)  1.8 L-Jet, new vacuum hoses. The car runs pretty well but pops a lot on decel. It will pop when just spinning down, and makes a LOT of noise when engine braking. I had leaks at the exhaust gaskets at the Monza mufflers, but I fixed those with no improvement. I don't see evidence of leaks anywhere else in the exhaust. This isn't backfiring, just annoying pops and blats. Before I start digging deeper into the exhaust, are there other things that could cause this? try to get more air in the system at idle (higher idle setting). it may help or at least help you to figure it out. spark plug gaping could help also (cant explain that but noticed this worsen or improve for me while i was testing gaps one day) (IMG:style_emoticons/default/biggrin.gif) Gary |
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| McMark |
Jun 3 2012, 10:20 PM
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#3
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Check for exhaust leaks first.
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| timothy_nd28 |
Jun 3 2012, 10:52 PM
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#4
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest 
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Remove the copper gaskets from the heads, and inspect for carbon tracks. You should have a clean copper oval section on each gasket.
(copper gasket on head for exhaust, not the copper head gasket) |
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| URY914 |
Jun 4 2012, 06:21 AM
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#5
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,662 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
QUOTE(McMark @ Jun 3 2012, 09:20 PM) Check for exhaust leaks first. 100% |
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| TheCabinetmaker |
Jun 4 2012, 11:05 AM
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#6
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
QUOTE(URY914 @ Jun 4 2012, 07:21 AM) QUOTE(McMark @ Jun 3 2012, 09:20 PM) Check for exhaust leaks first. 100% I agree with the exhaust leaks. |
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