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Registered
Join Date: Feb 2001
Location: South of the Mason-Dixon Line
Posts: 3,722
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Why A Rough Idle After Tune-Up?
I changed out my spark plugs, replaced my fuel filter and changed the oil and oil filter and after start up, it idles a bit rough. Its the 2.4, 1973.5T CIS engine. I went back to check my spark plug connectors, make sure I did not bump any vacuum, gas or electrical lines, and yet its till on the rough side. On the road it runs like a bat outta hell in all gears throughout the rpm ranges, but its very peculiar why this happened.
Can new spark plugs cause an issue? Richen up the mixture? Any advice is always appreciated from you folks. Thanks Bob 73.5T - CIS |
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05-12-2005, 11:12 AM
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Registered
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Although you didn't mention it, I assume you gapped your plugs correctly...
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Jim Dean LL.B. - London, Ont, Canada. 1969 911T "Blood Orange" Euro (Brought over from Germany in 86) Engine and brake system rebuilds 2006 & 2007 "Oversteer scares passengers, understeer scares drivers." |
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05-12-2005, 11:21 AM
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Registered
Join Date: Feb 2001
Location: South of the Mason-Dixon Line
Posts: 3,722
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I used the right plugs and gapped correctly. The idle is a slight intermittent miss, that although is not very pronounced, was not present before. Its a mystery to me.
Bob |
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05-12-2005, 12:49 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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Assuming your ignition cables are old stock Beru, disturbing them with a tune up might be enough to cause them to fail.
Joe |
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05-12-2005, 01:16 PM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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Assuming you used the same/ correct plugs.
Did you check your rotor, cap,timing, and dwell? Maybe your dwell & timing are off but you didn't notice it before.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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05-12-2005, 02:35 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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If you have a pop off valve you might make sure it's seated.
Joe |
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05-13-2005, 07:49 AM
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1969 Porsche 911T
