 '98 GT RPM's limited, wont rev past 5,000rpm's |
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 Jan 15, 2009 - 11:41 AM
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 Enthusiast  Joined Jun 9, '06 From Vero Beach Fl. Currently Offline Reputation: 15 (100%)  |
I have a '98 GT with 130,000 miles on it. It is properly tuned and runs great . I average about 30 miles per gallon. The engine runs smooth from idle all the way up to 5,000RPM's. At the point when it hits 5k rpm's, it wont rev any higher in any gear. It just flattens out at 5k. Other then that, it runs strong with no other issues. Can anyonr tell me what the problem is?
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Jan 15, 2009 - 3:47 PM
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 Enthusiast Joined Mar 22, '07 From Houston, TX Currently Offline Reputation: 4 (100%) |
does it feel like the engine cuts off at that RPM, or does it just not want to go faster than that
-------------------- QUOTE "And, as always, your friendship, help, and dedication to the advancement of Texas Celica dominance is GREATLY appreciated. Thanks bro." -DEATH 1994 GT: V6 swap, 5speed E53 W/ LSD, All Power, now RED 1995 ST: SOLD @273k miles, Auto, all power, CarPC, White 1994 ST: Totaled, 5spd, all power, Red RIP 07/09/09 @ 241,810 1994 Lexus LS400: This is my new DD |
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Jan 15, 2009 - 6:43 PM
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Enthusiast Joined Jun 9, '06 From Vero Beach Fl. Currently Offline Reputation: 15 (100%) |
QUOTE (stephen_lee @ Jan 15, 2009 - 4:47 PM)  does it feel like the engine cuts off at that RPM, or does it just not want to go faster than that It does not cut off, it just wont rev any higher. It remains running at 5k, but rough (it kind of stuters at 5k) and when I let off on the gas, it smooths out at under 5k. -------------------- |
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Jan 15, 2009 - 7:13 PM
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 Enthusiast Joined Feb 11, '08 From Auckland, New Zealand Currently Offline Reputation: 0 (0%) |
By nature of your FE engine, 5k is the plateau of your powerband... If you're having fueling issues (either lean or rich) then 5k would be about right for it to stutter... Do you know how to diagnose a lean/rich condition?
-------------------- Mike W
1996 Toyota Celica ST205 GT-FOUR GT2860RS turbine, TiAL mvr44, JE 86.5φ piston, Clutchmasters FX400, APEX P-FC 269awhp / 273ft-lbs |
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Jan 16, 2009 - 11:10 AM
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 Enthusiast Joined Oct 10, '08 From sweet home, OR Currently Offline Reputation: 3 (100%) |
i don't believe that iv got mine up past 5
-------------------- "she can polish my strut bar anytime As long as her blow-off valve's in good order"
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Jan 16, 2009 - 11:23 AM
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Enthusiast Joined Jun 9, '06 From Vero Beach Fl. Currently Offline Reputation: 15 (100%) |
QUOTE (delusionz @ Jan 15, 2009 - 8:13 PM) By nature of your FE engine, 5k is the plateau of your powerband... If you're having fueling issues (either lean or rich) then 5k would be about right for it to stutter... Do you know how to diagnose a lean/rich condition? Between my wife and I, we have 3 6GC's. My wifes '94 GT automatic revs to red line before shifting in all gears. My '94 GT manual will rev to and beyond red line before a shift with no problem. Our '98 is the only one with the problem. -------------------- |
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Jan 16, 2009 - 12:17 PM
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Enthusiast Joined Dec 14, '06 From MN, USA Currently Offline Reputation: 2 (100%) |
Why would you need to go over 4k? I don't ever go over 3.5 most of the time.
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Jan 16, 2009 - 12:46 PM
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Enthusiast Joined Jun 25, '05 From Fort Wayne, IN Currently Offline Reputation: 14 (100%) |
My money says you're losing fuel pressure. I've seen it a dozen times. Car runs great but if you're on it and revving it up it just hangs and doesn't go farther. Time for a fuel pump.
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Jan 16, 2009 - 6:02 PM
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Enthusiast Joined Jun 9, '06 From Vero Beach Fl. Currently Offline Reputation: 15 (100%) |
QUOTE (99GT @ Jan 16, 2009 - 1:17 PM) Why would you need to go over 4k? I don't ever go over 3.5 most of the time. It's not necessarily the need to do it, if the engine is performing properly it should be able to rev to the red line. If it can't, that is indicative of a problem. -------------------- |
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Jan 17, 2009 - 1:21 PM
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 Enthusiast Joined Feb 19, '04 From austin tx Currently Offline Reputation: 1 (100%) |
I would replace the fuel filter and see what that does before replacing the fuel pump.
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Jan 17, 2009 - 1:48 PM
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 Enthusiast Joined Aug 21, '07 From Toronto Currently Offline Reputation: 1 (100%) |
your wife's auto GT revs to red line before shifting in all gears???
-------------------- -Derick
 "In hoc signo vinces." In this sign thou shalt conquer." Gone but never forgotten.... |
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