Flat spot at 3000 rpm

robbieracer · 10-20-2003, 06:13 PM

I have a 97 Tacoma 4x4 with the V6 engine. When I'm accelerating I always hit a flat spot around 3000 rpm and at about 3300 rpm it feels like it's normal again and it pulls strong all the way to 5000 rpm. Any ideas what the problem is? Could it be the chip, or is this normal for my year engine?

Rob

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***midiwall*** · 10-20-2003, 10:49 PM

Given that you've taking care of the rig being able to exhale correctly with the headers and the exhaust, have you done anything to get it to inhale better? i.e, a deckplate or FIPK or at least a free-flow filter? That may help some...

I'm still learning the engine game, but If I had to guess, I'd say that you're leaning out. If so, then you need to find a way to get more fuel to the engine at that RPM. There are a number of fuel management units around, personally, I use the PerfectPower SMT-5. The longest thread on the board is dedicated to it:

http://www.yotatech.com/showthread.php?s=&threadid=5130

robbieracer · 10-21-2003, 05:30 AM

It has done this from the day I bought it (all stock), with 39,000 miles, it now has about 48,000 miles on it. I did all the modifications myself, so the problem was already there. I have a K&N filter and removed the elbow in the airbox, so I think I'm getting plently of air... I had the truck for a year now and did all the mods this spring.

Biohazard · 10-21-2003, 05:54 AM

i have a '99 and it has done what you're describing from day one. it kinda sputters just a bit around 3K and then it picks right back. it's never gotten better or worse and i have a little over 100K on it now. i haven't done any mods to the intake / exhaust yet (lazy) but i plan to eventually. just thought it would help to know you're not alone

mtnfreak · 10-21-2003, 07:36 AM

Toyota's just balancing out your engine with the 3.0. The 3.0 only had power from 3000 to 3300 rpm.

rwmorrisonjr · 10-21-2003, 07:38 AM

robbieracer · 10-21-2003, 10:10 AM

Well, it's nice to know I'm not the only one with this, but it would be nice to fix it somehow. It's especially noticable now that I'm pulling a boat, it takes longer to get past the flat spot...

Unhappy99 · 10-21-2003, 03:33 PM

The flat spot at 3K on my 99 4runner vanished after I cleaned the MAF/IAT.

robbieracer · 10-23-2003, 09:34 AM

I cleaned out my MAT/IAT, and I still have that dead spot at 3000 rpm. Any other Ideas...?

10-20-2003, 10:49 PM	#2 (permalink)
*midiwall* Sponsoring Member Join Date: Dec 2002 Location: Seattleish, WA Posts: 9,078	Given that you've taking care of the rig being able to exhale correctly with the headers and the exhaust, have you done anything to get it to inhale better? i.e, a deckplate or FIPK or at least a free-flow filter? That may help some... I'm still learning the engine game, but If I had to guess, I'd say that you're leaning out. If so, then you need to find a way to get more fuel to the engine at that RPM. There are a number of fuel management units around, personally, I use the PerfectPower SMT-5. The longest thread on the board is dedicated to it: http://www.yotatech.com/showthread.php?s=&threadid=5130 __________________ ~ Mark '96 4Runner Limited S/C MI - 370cc injectors, Air! horns, Airaid MIT, ATS A-arms, 285/75/R16 BFG MTs, Bored TB, Brembo slotted, Cobra 75 WXST, Deckplate, Downey headers, Hayden cooler, IPT valve body, Level 10 torque convertor, Meanstreak exhaust, OME/OME rears, On-board PC (XM, Nav, WiFi, etc), Port 'n Polish, Remote Start, SAW fronts, Hilux console, SMT-5, Stubb's sliders, Supra MAF, TJM-17, 2.0" pulley, Viair 450c, Walbro 190, Weasy2k cams

10-21-2003, 05:30 AM	#3 (permalink)
robbieracer Registered User Join Date: Feb 2003 Location: Sacramento, ca Posts: 36	It has done this from the day I bought it (all stock), with 39,000 miles, it now has about 48,000 miles on it. I did all the modifications myself, so the problem was already there. I have a K&N filter and removed the elbow in the airbox, so I think I'm getting plently of air... I had the truck for a year now and did all the mods this spring. __________________ 97 Tacoma 4x4 v6 ext cab w/TRD headers, TRD supercharger, URD supercharger performance kit, Borla exhaust, electric Flex-A-Lite, A.O.R. springs, Bilstein, 31" Bridgestone Revo AT, Line-X, LiteRider Toneau, Nakamichi receiver & amp, Focal Speakers & Subwoofer

10-21-2003, 05:54 AM	#4 (permalink)
Biohazard Contributing Member Join Date: Feb 2003 Location: Knoxville, TN Posts: 292	i have a '99 and it has done what you're describing from day one. it kinda sputters just a bit around 3K and then it picks right back. it's never gotten better or worse and i have a little over 100K on it now. i haven't done any mods to the intake / exhaust yet (lazy) but i plan to eventually. just thought it would help to know you're not alone __________________ Nate 99 4WD Tacoma SR5 Ext Cab TRD V6 5SPD

10-21-2003, 07:36 AM	#5 (permalink)
mtnfreak Contributing Member Join Date: Nov 2002 Location: People's Republic of Boulder Posts: 830	Toyota's just balancing out your engine with the 3.0. The 3.0 only had power from 3000 to 3300 rpm. __________________ 89 4Runner, V6, Auto, Some stuff's stock, some's not. Last edited by mtnfreak; 10-21-2003 at 07:38 AM.

10-21-2003, 07:38 AM	#6 (permalink)
rwmorrisonjr Contributing Member Join Date: Aug 2002 Location: Home: Aurora, CO; Work: The People's Republic of Denver Posts: 1,992	__________________ DD: 2006 Jeep Commander Sport 4.7l Trail rig: 1984 BII, 2.8, MSD 6A & Blaster 2 coil, Holley 2300, C5, OEM 1350, 7.5 & D28 with 4.56s, 33x12.50 BFG AT KOs on 15x8 black steelies, new "jeep" seats. Ugly but it runs and its paid for! ----------------------------------------------------------------------------------------- "An armed society is a polite society. Manners are good when one may have to back up his acts with his life."- Robert A. Heinlein

10-21-2003, 10:10 AM	#7 (permalink)
robbieracer Registered User Join Date: Feb 2003 Location: Sacramento, ca Posts: 36	Well, it's nice to know I'm not the only one with this, but it would be nice to fix it somehow. It's especially noticable now that I'm pulling a boat, it takes longer to get past the flat spot... __________________ 97 Tacoma 4x4 v6 ext cab w/TRD headers, TRD supercharger, URD supercharger performance kit, Borla exhaust, electric Flex-A-Lite, A.O.R. springs, Bilstein, 31" Bridgestone Revo AT, Line-X, LiteRider Toneau, Nakamichi receiver & amp, Focal Speakers & Subwoofer Last edited by robbieracer; 10-21-2003 at 12:42 PM.

10-21-2003, 03:33 PM	#8 (permalink)
Unhappy99 Registered User Join Date: Sep 2003 Location: Albuquerque, NM Posts: 381	The flat spot at 3K on my 99 4runner vanished after I cleaned the MAF/IAT. __________________ 03 Dodge Ram 2500 CTD...its amazing Ex: 1999 4Runner JT3HN86R1X0199261...Now somebody elses Karl Malone Toyota 'Certified' POS Legendary Toyota quality is exactly that: A thing of legend. Defective fuel gauge - 'Certified' Defective brake rotors - 'Certified' Defective axle seals - 'Certified' Defective heater diverter - 'Certified' etc. etc. etc.

10-23-2003, 09:34 AM	#9 (permalink)
robbieracer Registered User Join Date: Feb 2003 Location: Sacramento, ca Posts: 36	I cleaned out my MAT/IAT, and I still have that dead spot at 3000 rpm. Any other Ideas...? __________________ 97 Tacoma 4x4 v6 ext cab w/TRD headers, TRD supercharger, URD supercharger performance kit, Borla exhaust, electric Flex-A-Lite, A.O.R. springs, Bilstein, 31" Bridgestone Revo AT, Line-X, LiteRider Toneau, Nakamichi receiver & amp, Focal Speakers & Subwoofer

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