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Author
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Topic: Bad exhaust note after spark plug change
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RSA-Mustang
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Member # 11540
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posted
 
 
Just changed spark plugs earlier today with motorcraft plugs on an 02 GT. Reasons were that I last changed them 50k miles ago and now car was beginning to misfire (very few times) and the car wouldn't respond under full throttle in all gears. Problem I have now is that no more misfires or lack of acceleration but the car does have a REALLY bad exhaust note after I drove it five miles. I did take it out around the neighborhood after the install and car responded well but an hour later I drove to the store and the thing sounds similar to a V6 with a very shitty exhaust job. My current setup is stocks headers. Magnaflow tru x catted pipe, bassani cat back with magnapaks welded in. I have zero white smoke and no lights on in the dash. What could possibly be the problem?
Posts: 332 | From: San Francisco | Registered: Dec 2011
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90chp coupe
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Member # 11689
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posted
Check ur spark plug gap. Make sure they are all at spec.
[ 2014-03-02, 11:36 PM: Message edited by: Bullitt1080 ]
Posts: 29 | From: San Jose | Registered: Feb 2012
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Flatline
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Member # 12081
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Agreed. Check plug gap and make sure boots are seated properly on plug.
Posts: 235 | Registered: Jun 2012
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dohcfox
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Member # 12829
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posted
Make sure you have the plugs tight. Could be compression pushing thru the plugs from loose plugs. Also no anti sieze on the plugs. They want to back out all the time on their own.
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97 mustang track car
57 f100 built on 06 Lincoln navigator frame
83 elcamino d.d.
64 ford galaxie
Porsche turbo
Posts: 139 | Registered: Apr 2013
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redvenom
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Member # 12651
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posted
quote:
Originally posted by Flatline:
Agreed. Check plug gap and make sure boots are seated properly on plug.
+1
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1990 Gt
Some what stock
1993 GT vert-(stolen)
Posts: 623 | From: cali | Registered: Dec 2012
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RSA-Mustang
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Member # 11540
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posted
Sorry I should have mentioned I did use anti seize. Didn't check gap before because plugs are ford spec but I will double check them and the boots.
Posts: 332 | From: San Francisco | Registered: Dec 2011
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MaK_1967v8
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Member # 12187
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posted
I don't care who says what about a "factory gap" You check those suckers before you slap them in. a gap tool is maybe a couple cents short of 2 bucks, and its an extremely important tool.
+2 on gap.
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1967 C Code Coupe
2004 Roush Stage 2
Posts: 620 | From: Sacramento, CA | Registered: Jul 2012
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NEIGHT
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Member # 8741
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posted
quote:
Originally posted by RSA-Mustang:
Sorry I should have mentioned I did use anti seize. Didn't check gap before because plugs are ford spec but I will double check them and the boots.
There's your problem. ALWAYS check the gap before installing.
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-Savage Habits-
1992 Summer Edition
1986 Hatch- catfish killer
1964 Impala hard top
Posts: 18584 | From: EA$T $IDE REDWOOD CITY | Registered: Nov 2008
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RSA-Mustang
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Member # 11540
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posted
Thanks for the advice. Car runs better now, a few plugs had gaps that were too small.
Posts: 332 | From: San Francisco | Registered: Dec 2011
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Beastly GT500 TVS
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Member # 9723
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posted
Lesson learned always check gap
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91/E85 tune by SHAUN AT AED
700HP/700TQ ON E85
10.78@129MPH 1.644 60FT
WWW.AEDHP.COM
Posts: 893 | From: 707 | Registered: Jan 2010
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