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Old 07-18-2006, 07:04 PM   #1
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running problem less power

I have a 2000 v6 running 5 psi procharger s/c, my car has been running rough lately it idles fine my boost gauge hasnt changed readings at any time including when in vacuum. i just seem to have less power. i changed my spark plugs and my wires are good. i have been smelling my exhaust system lately like sulfur smeel of cats.i do still have stock exhaust,and sometimes it takes a little while for my engine to rev down to idle it will stay around 2000 3000 rpm for a few seconds when i stop i have a manual trans. so today i ran a compression check and cyl 1,2,3,4 have around 200psi i think thats kinda high possibly due to carbon buildup from cats starting to get clogged, cyl 5 has 175 and cyl 6 has 125 psi which i think is kinda low. not sure where to go from here. i usually run a 14.2 at the track and this weekend ran a 15.1 getting full boost but my power seemed to drop off in third and 4th gear when going down the track. any ideas would be helpful, im thinking cats and fuel pump i have the fuel pump and wondering i might be getting weak fuel pressure.
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Old 07-18-2006, 08:31 PM   #2
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Re: running problem less power

I would check your cats, they may very well be cloged.
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Old 07-18-2006, 10:13 PM   #3
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Re: running problem less power

Maybe a fuel pump or weak injector....?

I would definately check the cats first though.
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Old 07-19-2006, 05:26 PM   #4
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Re: running problem less power

well i checked cyl 6 again today dry it was 115 wet it was 118 so its definitely valve related so i either have a burned valve or carbon build up on the valve is not allowing it to seal properly. so the dual exhaust is on the way and im getting money together so i can take the head off and take a look at my valves but im gonna wait til i get all the parts before i do that.
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Old 07-23-2006, 10:20 PM   #5
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Re: running problem less power

Quote:
Originally Posted by jedwards242000 View Post
well i checked cyl 6 again today dry it was 115 wet it was 118 so its definitely valve related so i either have a burned valve or carbon build up on the valve is not allowing it to seal properly. so the dual exhaust is on the way and im getting money together so i can take the head off and take a look at my valves but im gonna wait til i get all the parts before i do that.
Probably smoked a piston #6 has a bad habit about running lean .The only way I know to guard against that is have the injectors cleaned and flowed
and put the highest flowing injectors in #3 and #6.
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Old 07-24-2006, 09:25 AM   #6
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Re: running problem less power

seafoam it.... that'll clean the engine out greatly
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Old 08-01-2006, 12:07 AM   #7
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Re: running problem less power

well i highly doubt the piston went up if that happened i would hear it and the compression would be really low not 125, also if the rings were messed up a wet compression test would have brought it up some. if im wrong please explain to me why im wrong but that is my understanding of how that works
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Old 08-01-2006, 04:23 PM   #8
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Re: running problem less power

wow..on a boosted car the dual exhaust should help lots..not for that problem but..
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