losing power in high RPMs
11-16-2008, 07:15 PM
#1
On The Tree
Thread Starter
Join Date: Sep 2008
Location: Roanoke Rapids, NC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
losing power in high RPMs i normally try to take it kinda easy on my car and not take it higher than 5000 RPMs but today i was playing around with it today and wound it out to 6 a couple times.. i didn't notice it in first because i was just spinning like crazy but in second and third i noticed when i got around 5200 or 5300 rpms it lost a little power. the car has only 55000 miles on it but i think it still has the stock spark plugs.. does anyone have any idea what would cause this to happen? bad plugs maybe? the car is still all stock except for a K&N air filter which was in it when i bought it.
11-17-2008, 07:46 AM
#2
TECH Junkie
iTrader: (5)
Join Date: Feb 2007
Location: Key West, Florida
Posts: 3,183
Likes: 0
Received 0 Likes
on
0 Posts
if you rarely drive it like that, sometimes it takes a WOT blast or 2 to "clean it out" if you know what i mean.
other possibilities are plugs (as you stated) or fuel starvation. could be a clogged fuel filter or dying fuel pump.
check your fuel pressure
have it tuned...after a tune up.
other possibilities are plugs (as you stated) or fuel starvation. could be a clogged fuel filter or dying fuel pump.
check your fuel pressure
have it tuned...after a tune up.
11-17-2008, 06:46 PM
#5
On The Tree
Thread Starter
Join Date: Sep 2008
Location: Roanoke Rapids, NC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
okay i removed the muffler today making room for the b&b i just ordered and i mashed on her again and i could hear it breaking up at about 5500
Trending Topics
11-17-2008, 08:52 PM
#8
Teching In
iTrader: (9)
Join Date: Oct 2007
Location: Spring TX
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
You could possibly have some bent pushrods. My car did the same thing..wasnt sure what was going on untill a few weeks later it started ticking. Turned out i bent some pushrods. Put in some hardened ones and it solved my problems.
11-17-2008, 09:07 PM
#9
TECH Junkie
iTrader: (5)
Join Date: Feb 2007
Location: Key West, Florida
Posts: 3,183
Likes: 0
Received 0 Likes
on
0 Posts
plugs...keep it simple
ngk tr55s...gapped to .060"
$2 each
no need for $10/per plug platnum, irridium, gold, titanium or whatever other fancy crap they've concocted.
but while you're working on the car....i still suggest a $10 fuel filter.
find someone with scanning software and see if you're getting KR or misfires.
ngk tr55s...gapped to .060"
$2 each
no need for $10/per plug platnum, irridium, gold, titanium or whatever other fancy crap they've concocted.
but while you're working on the car....i still suggest a $10 fuel filter.
find someone with scanning software and see if you're getting KR or misfires.
11-17-2008, 09:14 PM
#10
TECH Senior Member
iTrader: (23)
Join Date: Aug 2005
Location: Watertown, NY
Posts: 8,797
Likes: 0
Received 0 Likes
on
0 Posts
Its a stock car, it will naturally die off up top like that. Best you can probably do is a basic tuneup. Replace the air/fuel filter, plugs, and run some injector cleaner. Check the plug wires as well.
11-19-2008, 08:31 PM
#14
On The Tree
Thread Starter
Join Date: Sep 2008
Location: Roanoke Rapids, NC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
i bought my new plugs today and got a fuel filter too.. i'll probably just wait until i get my headers before i change them and just do it when i have the manifolds off
11-20-2008, 12:35 AM
#17
Banned
iTrader: (4)
Join Date: Oct 2005
Location: Danville, KY
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
My TA is doing this right now and I suspect mine to be a fuel pump because it starts getting lean towards the 5500-up and my injector duty cycle is 128% at 6400 rpm's and the afr is around the 13.6-13.8 at WOT (which isnt good!!!). I know for a fact I can't be maxxing the injectors out if they have the full 60psi of fuel pressure but I think in the upper RPM's my pump is crapping out on me and dropping fuel pressure. So a new Walbro will be going in the car within the week and then retuned. BTW, stock F-body fuel pumps are junk!
11-20-2008, 12:40 AM
#18
12 Second Club
iTrader: (12)
Join Date: Feb 2008
Location: westminster MD
Posts: 407
Likes: 0
Received 0 Likes
on
0 Posts
i can add another to the fuel filter/injector cleaner.... a while back my car would die off at about 4000 rpm's and was just a turd. the car had about 120k on it and i noticed that the fuel filter had never been freplaced. i went to advance auto purchased some gumout injector and valve cleaner and replaced the fuel filter.
let her sit ideling for about 10 mins. let took her for a spin and WOT, i could actually feel her waking up again. it was def a kick in the *** for the car.
let her sit ideling for about 10 mins. let took her for a spin and WOT, i could actually feel her waking up again. it was def a kick in the *** for the car.
11-20-2008, 08:06 PM
#20
TECH Junkie
iTrader: (5)
Join Date: Feb 2007
Location: Key West, Florida
Posts: 3,183
Likes: 0
Received 0 Likes
on
0 Posts
hahah
unless you cut a hole in the rear floor of the car....you have to drop the rear axle and then drop the entire tank.
not easy from a logistics standpoint...but not really mechanically difficult.
unless you cut a hole in the rear floor of the car....you have to drop the rear axle and then drop the entire tank.
not easy from a logistics standpoint...but not really mechanically difficult.