Rough Idle

Rough Idle Register Help Home Forum New Posts FAQ Calendar Community Groups Reported Items Top Posters Forum Actions Mark Forums Read Quick Links Today's Posts Contribution Actions Contribute Blogs What's New? Contribute Advanced Search Forum Toyota Engine Clubs V6 Owners Group Rough Idle
If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. Page 1 of 2 12 Last Jump to page: Results 1 to 20 of 27 Thread: Rough Idle Thread Tools Show Printable Version Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 08-02-2006, 11:47 PM #1 Oteck View Profile View Forum Posts Private Message View Blog Entries NanoDEATH! Join Date Aug 2005 Location New Westminster B.C. Posts 6,812 Thanks  31 Thanks  288 Thanked in258 Posts Blog Entries3 Total Contributions For
Oteck     $ 15.00 Rough Idle So my car runs... not too well and only for 9 secs. Right now im having issues w/ the rough idle. when i hit it to 2k rpm it seems fine like. I know not having the 3rd O2 sensor can't cause this, its only there to tell if the cat is working. Other than a vacuum leak what else would cause poor idle? Reply With Quote 08-03-2006, 12:47 AM #2 Gocasen View Profile View Forum Posts Private Message View Blog Entries Cage Fighter Join Date Apr 2006 Posts 146 Thanks  0 Thanks  0 Thanked in0 Posts Total Contributions For
Gocasen     $ 0.00 maybe timing is off to much.
Mr2 Webstie Zr-1 Website Mr2 and WRX Website Mr2 and Hatch Reply With Quote 08-03-2006, 01:45 PM #3 Toysrme View Profile View Forum Posts Private Message View Blog Entries Cage Fighter Join Date Oct 2005 Posts 681 Thanks  4 Thanks  24 Thanked in18 Posts Total Contributions For
Toysrme     $ 0.00 This is pretty much for all the engines.
If it won't idle, start with cleaning the IAC EGR & throttle body.

IAC, EGR, vacuum leak, sticking throttle plate, dirty MAF (Not a problem if you have an AFM), TPS sensor pretty far out of adjustment.
Poor spark (Plugs / dizzy cap & rotor).


Speaking of which... I'm just gunna copy my wont' run guide over. AIM/Yahoo/ICQ - Toysrme257th
PM for anything, anytime; including v6 turbos!
Reply With Quote 08-03-2006, 05:42 PM #4 Oteck View Profile View Forum Posts Private Message View Blog Entries NanoDEATH! Join Date Aug 2005 Location New Westminster B.C. Posts 6,812 Thanks  31 Thanks  288 Thanked in258 Posts Blog Entries3 Total Contributions For
Oteck     $ 15.00 my intake is as clean as it ever will be so i don't think its that (no sluge anywhere). i'll check the iac though
Right now i have 2 maf so i'll switch them and see if theres any difference. And whats a dizzy cap? :P

Also does the ECTS have anything to do w/ it? i pulled out my resistor box cuz it may turn out to be ineffecient. Don't want that thing starting a fire Reply With Quote 08-03-2006, 07:21 PM #5 Newbiewan View Profile View Forum Posts Private Message View Blog Entries Visit Homepage Mike King - Marietta, GA Join Date Jul 2005 Location Marietta, GA Posts 41 Thanks  0 Thanks  0 Thanked in0 Posts Total Contributions For
Newbiewan     $ 0.00 I had a similar issue after my install. I installed the throttlebody gasket upside down, which led to a hidden vacuum leak. I'm sure you are not as dense as me, so you probably did not do the same But, the way I found it was by running water over the different vacuum connections with a waterhose. Stopped looking when the idle improved and the slurping noises started!

Another clue that you have a vacuum leak will be that your MAF/AFM signal will be lower than what it should be at idle. (not sure if it would be noticable w/ AFM though - no experience) ____________________________________________
'91 NA->Turbo->3.0 V6SC
Completed 1MZFE V6 Swap Photos
Photos of the build
Wiring Diagrams (updated) Reply With Quote 08-03-2006, 07:25 PM #6 V6'er View Profile View Forum Posts Private Message View Blog Entries All Torque, All the Time Join Date Apr 2005 Location Charlotte, NC Posts 923 Thanks  0 Thanks  27 Thanked in20 Posts Total Contributions For
V6'er     $ 0.00 Just pull the MAF connector. It will run fine without it, just never in Closed Loop. Reply With Quote 08-03-2006, 09:19 PM #7 DaveMush View Profile View Forum Posts Private Message View Blog Entries Visit Homepage Mr2 V6 #8 Join Date Aug 2005 Location Syracuse, Ny Posts 416 Thanks  0 Thanks  14 Thanked in11 Posts Total Contributions For
DaveMush     $ 0.00 keep in mind guys tht he is running the vvti 1MZ intake manifold, MAF, ECU and electronics.... on a 3MZ block with 3MZ injectors...

that opens up a whole diff can of worms.


My guess is your fuel mix is all wrong.
91'/01' Mr2 V6, Purplish Blue Mica, 98' body
Dyno DaveMush.com Why I did the V6 swap...

1MZ running well... 2GR being rebuilt as we speak...
Reply With Quote 08-03-2006, 09:45 PM #8 Oteck View Profile View Forum Posts Private Message View Blog Entries NanoDEATH! Join Date Aug 2005 Location New Westminster B.C. Posts 6,812 Thanks  31 Thanks  288 Thanked in258 Posts Blog Entries3 Total Contributions For
Oteck     $ 15.00 found my problem, it's 2 ECTS selenoids throwing me into limp mode
P0758 - Shift Solenoid B Electrical
P0773 - Shift Solenoid E Electrical
im guessing it's being picky cuz im 1ohm short Reply With Quote 08-04-2006, 07:09 AM #9 Blitzo View Profile View Forum Posts Private Message View Blog Entries Visit Homepage 2GRFE MkIII / 1MZFE MkIII Join Date Jul 2006 Location Central FL Posts 17 Thanks  0 Thanks  0 Thanked in0 Posts Total Contributions For
Blitzo     $ 0.00 The tranny solenoids should not put you into limp mode. I run without the resistors about 50% of the time with no change in performance.

Hook up the code scanner and scour all the data parameters like Sherlock Holmes. Look for long and short term trim, temps, air flow rates - everything. Something should pop up.

I was able to run up to 12 ohms on the 5.6 ohm variety solenoid outputs without throwing codes (2GR, though - have not tested the 1MZ yet - need to get it running again first). Put the signal on a scope and see if it's spitting out a PWM signal or just steady state. Six cylinders of fury. Reply With Quote 08-16-2006, 12:21 AM #10 Oteck View Profile View Forum Posts Private Message View Blog Entries NanoDEATH! Join Date Aug 2005 Location New Westminster B.C. Posts 6,812 Thanks  31 Thanks  288 Thanked in258 Posts Blog Entries3 Total Contributions For
Oteck     $ 15.00 ok i got all the codes wrapped up but the idle still remains. i don't have the noisefilter plugged in the ignition system (didn't came w/ one) would that cause it? User Garage

Pending Projects
LS430 Big Brakes 95% | Rotary Climate Control 20% | Power Tilt & Telescopic Steering Column 75% | EA6X Six Speed | Lexus Capsule HID fog lamps | RX350BX Lowrise Completed Projects 1mz/3mz VVTI Hybrid V6 | Stainless Door Sills | Power Folding Mirrors | Motorized/Steering Fog lamps | Pedal Conversion | LED Gauges | Lexus Door Cover | Sway bar Relocation Tab | RFID Push Start | Heated Sideview Mirror Reply With Quote 08-16-2006, 12:29 AM #11 Weasy2k View Profile View Forum Posts Private Message View Blog Entries What is an MR2? Join Date Mar 2005 Location Vancouver, BC Posts 8,873 Thanks  33 Thanks  84 Thanked in69 Posts Total Contributions For
Weasy2k     $ 0.00 why dont you have it? Try unplugging the IAC valve and use your foot to bring idle low and see if it is rough...

and by rogh what do you mean? SOrry i couldnt come by i was out with friends tonight. Tommorw i may be able to after work? Reply With Quote 08-16-2006, 12:52 AM #12 Oteck View Profile View Forum Posts Private Message View Blog Entries NanoDEATH! Join Date Aug 2005 Location New Westminster B.C. Posts 6,812 Thanks  31 Thanks  288 Thanked in258 Posts Blog Entries3 Total Contributions For
Oteck     $ 15.00 it didn't came w/ it User Garage

Pending Projects
LS430 Big Brakes 95% | Rotary Climate Control 20% | Power Tilt & Telescopic Steering Column 75% | EA6X Six Speed | Lexus Capsule HID fog lamps | RX350BX Lowrise Completed Projects 1mz/3mz VVTI Hybrid V6 | Stainless Door Sills | Power Folding Mirrors | Motorized/Steering Fog lamps | Pedal Conversion | LED Gauges | Lexus Door Cover | Sway bar Relocation Tab | RFID Push Start | Heated Sideview Mirror Reply With Quote 08-16-2006, 12:56 AM #13 Weasy2k View Profile View Forum Posts Private Message View Blog Entries What is an MR2? Join Date Mar 2005 Location Vancouver, BC Posts 8,873 Thanks  33 Thanks  84 Thanked in69 Posts Total Contributions For
Weasy2k     $ 0.00 you still have plug? Reply With Quote 08-16-2006, 08:48 AM #14 3VZ-FE View Profile View Forum Posts Private Message View Blog Entries Some Skills Join Date Oct 2005 Location Norway Posts 200 Thanks  9 Thanks  5 Thanked in5 Posts Total Contributions For
3VZ-FE     $ 0.00 Wrong ecu=wrong fuel mix, would also guess that's where your problem is. You should try tuning it somehow (piggy or standalone). A 3.0L and a 3.3 don't use the same VE tables. If the injectors are different sizes, you get wrong pulsewidth from ecu also. What was the problem with the 3mz ecu? Last edited by 3VZ-FE; 08-16-2006 at 08:56 AM. '90 SW20 - 3VZ-FTE - MS'n'Edis (dd-car summerseason)

-Edition II - GT35R -335 whp/431 Nm @ 0.65 bar
-Edition I - N/A - 179 whp/258 Nm Reply With Quote 08-16-2006, 01:55 PM #15 Weasy2k View Profile View Forum Posts Private Message View Blog Entries What is an MR2? Join Date Mar 2005 Location Vancouver, BC Posts 8,873 Thanks  33 Thanks  84 Thanked in69 Posts Total Contributions For
Weasy2k     $ 0.00 Whats the use of VE tables when the MAF values and the O2 values will correct?
Compensation maps my friend

The only trhing i still worry about is TIMING....that is affected when a change of displacment is made... Reply With Quote 08-16-2006, 03:15 PM #16 3VZ-FE View Profile View Forum Posts Private Message View Blog Entries Some Skills Join Date Oct 2005 Location Norway Posts 200 Thanks  9 Thanks  5 Thanked in5 Posts Total Contributions For
3VZ-FE     $ 0.00 Hmmm, good point.. But the pulse width would be too long with bigger injectors than the ecu knows '90 SW20 - 3VZ-FTE - MS'n'Edis (dd-car summerseason)

-Edition II - GT35R -335 whp/431 Nm @ 0.65 bar
-Edition I - N/A - 179 whp/258 Nm Reply With Quote 08-16-2006, 05:53 PM #17 Weasy2k View Profile View Forum Posts Private Message View Blog Entries What is an MR2? Join Date Mar 2005 Location Vancouver, BC Posts 8,873 Thanks  33 Thanks  84 Thanked in69 Posts Total Contributions For
Weasy2k     $ 0.00 if the ecu doesnt like it
he will get a code that will tell him the fuel trim is off

The ecu will inject say 10ms and then the o2 sensor will go **** TO MUCH FUEL...the ecu will trim trim trim trim...until the O2 says SWEET perfect.

if it has to trim over 20% then the ecu will throw a CEL Reply With Quote 08-18-2006, 11:11 AM #18 Node View Profile View Forum Posts Private Message View Blog Entries Visit Homepage Mild Steel = Big Gains Join Date Feb 2005 Location WNC Posts 1,277 Thanks  0 Thanks  15 Thanked in15 Posts Total Contributions For
Node     $ 0.00 I thought that the long term fuel trim max on an OBDII ECU was only +/- 15% Maybe you could just use an FMU to get the ECU within a range it can handle? That way you can maintain the correct timing by adjusting the fuel pressure rather than playing with a piggyback or different injector sizes. FOR SALE:__ SKYLINE RB25DE-T S13 300dyno WHP!
http://forums.nicoclub.com/zerothread?id=246551
Reply With Quote 08-18-2006, 06:23 PM #19 Weasy2k View Profile View Forum Posts Private Message View Blog Entries What is an MR2? Join Date Mar 2005 Location Vancouver, BC Posts 8,873 Thanks  33 Thanks  84 Thanked in69 Posts Total Contributions For
Weasy2k     $ 0.00 The point is that the ecu doesnt have a fuel problem...well at least it doesnt SEE one If it did it would throw the CEL Reply With Quote 08-27-2006, 04:00 PM #20 Oteck View Profile View Forum Posts Private Message View Blog Entries NanoDEATH! Join Date Aug 2005 Location New Westminster B.C. Posts 6,812 Thanks  31 Thanks  288 Thanked in258 Posts Blog Entries3 Total Contributions For
Oteck     $ 15.00 well weasy had a chance to check it out, i tried putting a noise filter in but it didn't do much at all earlier it turned out the fuel pressure was too high but still didn't solve it, it set to 40psi atm on the ebay fpr. Im not quite impressed w/ it's accuracy but having that diagnostic tool sure helps User Garage

Pending Projects
LS430 Big Brakes 95% | Rotary Climate Control 20% | Power Tilt & Telescopic Steering Column 75% | EA6X Six Speed | Lexus Capsule HID fog lamps | RX350BX Lowrise Completed Projects 1mz/3mz VVTI Hybrid V6 | Stainless Door Sills | Power Folding Mirrors | Motorized/Steering Fog lamps | Pedal Conversion | LED Gauges | Lexus Door Cover | Sway bar Relocation Tab | RFID Push Start | Heated Sideview Mirror Reply With Quote Page 1 of 2 12 Last Jump to page: « Previous Thread | Next Thread » Posting Permissions You may not post new threads You may not post replies You may not post attachments You may not edit your posts   BB code is On Smilies are On [IMG] code is On [VIDEO] code is On HTML code is Off

Forum Rules

-- BlueSteel -- vB4 Default Style -- Default Mobile Style Contact Us Toyota MR2 Message Board Archive Top All times are GMT -5. The time now is 11:22 PM. Powered by vBulletin® Version 4.2.5
Copyright © 2026 vBulletin Solutions Inc. All rights reserved. Copyright © 2004-2017 - East Coast Imports, LLC vBulletin Skins by Bluepearl Skins