Resticted exhaust causing plugs to foul? - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer Resticted exhaust causing plugs to foul?

Print Thread

Resticted exhaust causing plugs to foul? #90886 07/19/08 05:51 PM 07/19/08 05:51 PM
Joined: Jan 2003 Posts: 574 Western New York since 2000 D dart44072 OP super gas
dart44072 OP super gas D Joined: Jan 2003 Posts: 574 Western New York since 2000	After reading a post about exhaust restriction, I got to thinking about my problem. No matter what I've tried(and I've tried everything ) my fresh 360 in my 64 Valiant keeps fouling plugs and runs like crap.Runs so bad i cant get any adjustments to make a difference. I have spitfire headers but the exhaust shop kinda screwed up my 2 1/4"pipes . It's pretty tight up by the engine area and they may have put a few to tight restictions and it's not mandrel bent. Does anyone have any "real life " experience with exhaust restriction? What would the symptoms be? Thanks, Dave.............

Re: Resticted exhaust causing plugs to foul? [Re: dart44072] #90887 07/19/08 06:01 PM 07/19/08 06:01 PM
Joined: Jan 2003 Posts: 20,717 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,717 Eagle, Idaho	Sounds more like a carburetor jetting problem.

Re: Resticted exhaust causing plugs to foul? [Re: Neil] #90888 07/19/08 06:06 PM 07/19/08 06:06 PM
Joined: Jan 2003 Posts: 574 Western New York since 2000 D dart44072 OP super gas
dart44072 OP super gas D Joined: Jan 2003 Posts: 574 Western New York since 2000	I've tried 5 carbs from a new 600 eddy, a used 600 eddy, a new 750 eddy a new 750 Holley and a Thermoquad. All had the same results.

Re: Resticted exhaust causing plugs to foul? [Re: Neil] #90889 07/19/08 06:15 PM 07/19/08 06:15 PM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Sounds like another problem to me if it fouling plugs.

Re: Resticted exhaust causing plugs to foul? [Re: MoparforLife] #90890 07/19/08 06:28 PM 07/19/08 06:28 PM
Joined: Jan 2003 Posts: 574 Western New York since 2000 D dart44072 OP super gas
dart44072 OP super gas D Joined: Jan 2003 Posts: 574 Western New York since 2000	I tried another dist. and another intake. I've set the timing just about anywhere it'll keep running and cant get it to stop fouling plugs. I have 3 sets of plugs that i keep changing in and out. What a pain in the a**!!!! I just thought maybe the exhaust was choking out the engine? But probably wouldn't effect it that much at idle.

Re: Resticted exhaust causing plugs to foul? [Re: dart44072] #90891 07/19/08 06:36 PM 07/19/08 06:36 PM
Joined: Jul 2008 Posts: 30,469 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,469 Florida STAYcation	They are fuel fouled ? ... waaaay too cold of plugs ??

Re: Resticted exhaust causing plugs to foul? [Re: dOc !] #90892 07/19/08 06:52 PM 07/19/08 06:52 PM
Joined: Jan 2003 Posts: 20,717 Eagle, Idaho Neil The Doctor is in.
Neil The Doctor is in. Joined: Jan 2003 Posts: 20,717 Eagle, Idaho	If it was possible for an exhaust system to foul plugs then the stock 273 a-body cars would be in trouble. Manifolds don't come any more restrictive than those things.

Re: Resticted exhaust causing plugs to foul? [Re: Neil] #90893 07/19/08 07:01 PM 07/19/08 07:01 PM
Joined: Jan 2003 Posts: 574 Western New York since 2000 D dart44072 OP super gas
dart44072 OP super gas D Joined: Jan 2003 Posts: 574 Western New York since 2000	Plugs are black powder coated.

Re: Resticted exhaust causing plugs to foul? [Re: dart44072] #90894 07/20/08 12:30 AM 07/20/08 12:30 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	choke staying on too long. EDIT. or rings aren't seated. where is your timing at? Last edited by RapidRobert; 07/20/08 01:17 AM. live every 24 hour block of time like it's your last day on earth

Re: Resticted exhaust causing plugs to foul? [Re: RapidRobert] #90895 07/20/08 12:58 AM 07/20/08 12:58 AM
Joined: Jul 2008 Posts: 30,469 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,469 Florida STAYcation	To test ...put in a set of 3 step HOTTER plugs.

Re: Resticted exhaust causing plugs to foul? [Re: dOc !] #90896 07/20/08 06:47 AM 07/20/08 06:47 AM
A Anonymous Unregistered
Anonymous Unregistered A	Maybe your ignition is not gettin the rite voltage ????

Re: Resticted exhaust causing plugs to foul? #90897 07/20/08 08:49 AM 07/20/08 08:49 AM
Joined: Feb 2005 Posts: 710 St Louis, MO 63026 convx4 super stock
convx4 super stock Joined: Feb 2005 Posts: 710 St Louis, MO 63026	To test for exhaust restriction 1. Connect vacuum gauge to manifold vacuum and tach to the engine. 2. Gradually accelerate engine from idle to 2000 RPM 3. Note vacuum reading. 4. Maintain 2000 RPM for 10 seconds or longer while observing vacuum gauge. If exhaust system is restricted, vacuum reading will gradually decrease.

Re: Resticted exhaust causing plugs to foul? [Re: convx4] #90898 07/20/08 09:47 AM 07/20/08 09:47 AM
Joined: Apr 2007 Posts: 1,261 ILL mark7171 pro stock
mark7171 pro stock Joined: Apr 2007 Posts: 1,261 ILL	Quote: To test for exhaust restriction 1. Connect vacuum gauge to manifold vacuum and tach to the engine. 2. Gradually accelerate engine from idle to 2000 RPM 3. Note vacuum reading. 4. Maintain 2000 RPM for 10 seconds or longer while observing vacuum gauge. If exhaust system is restricted, vacuum reading will gradually decrease. you shure about that one...i use a manometer

Re: Resticted exhaust causing plugs to foul? [Re: mark7171] #90899 07/20/08 09:53 AM 07/20/08 09:53 AM
Joined: Jan 2003 Posts: 13,605 md M mopars4ever I Live Here
mopars4ever I Live Here M Joined: Jan 2003 Posts: 13,605 md	Are you running a electric fuel pump?

Re: Resticted exhaust causing plugs to foul? #90900 07/20/08 09:58 AM 07/20/08 09:58 AM
Joined: Dec 2004 Posts: 1,061 New Mexico D dmerc super stock
dmerc super stock D Joined: Dec 2004 Posts: 1,061 New Mexico	Quote: Maybe your ignition is not gettin the rite voltage ???? This is the direction I would head in. You may have a weak spark. Try a different coil. Bypass your ballast resistors to see if that changes things. i had this happen to me along time ago and after changing almost all the parts my dad comes over and says did you check the coil? Uh, no dad. Stuck an old used coil on and it ran great.

Re: Resticted exhaust causing plugs to foul? [Re: dmerc] #90901 07/20/08 10:10 AM 07/20/08 10:10 AM
Joined: Jan 2003 Posts: 32,971 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,971 Grand Prairie,Texas	This may sound odd but have you checked to make sure you have the +,- wires to the coil hooked up correctly? It's possible to have them backwards and run. This will give you symtoms similar to what you are expreiencing.

Re: Resticted exhaust causing plugs to foul? [Re: stumpy] #90902 07/20/08 10:34 AM 07/20/08 10:34 AM
Joined: Jan 2003 Posts: 574 Western New York since 2000 D dart44072 OP super gas
dart44072 OP super gas D Joined: Jan 2003 Posts: 574 Western New York since 2000	The electrical part of it I haven't really checked. I'll play around with that stuff Monday afternoon. Thanks for brainstorming for possible problems. I'll listen to any thoughts Dave.........ps. NO electric fuel pump.

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1