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Rough Idle [Archive] - Toyota MR2 Message Board

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Rough Idle [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > Toyota Engine Clubs > V6 Owners Group > Rough Idle PDA

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Oteck08-02-2006, 11:47 PMSo 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? Gocasen08-03-2006, 12:47 AMmaybe timing is off to much. Toysrme08-03-2006, 01:45 PMThis 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. Oteck08-03-2006, 05:42 PMmy 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 Newbiewan08-03-2006, 07:21 PMI 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) V6'er08-03-2006, 07:25 PMJust pull the MAF connector. It will run fine without it, just never in Closed Loop. DaveMush08-03-2006, 09:19 PMkeep 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. Oteck08-03-2006, 09:45 PMfound 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 Blitzo08-04-2006, 07:09 AMThe 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. Oteck08-16-2006, 12:21 AMok 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? Weasy2k08-16-2006, 12:29 AMwhy 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? Oteck08-16-2006, 12:52 AMit didn't came w/ it :( Weasy2k08-16-2006, 12:56 AMyou still have plug? 3VZ-FE08-16-2006, 08:48 AMWrong 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? Weasy2k08-16-2006, 01:55 PMWhats 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... 3VZ-FE08-16-2006, 03:15 PMHmmm, good point.. :) But the pulse width would be too long with bigger injectors than the ecu knows Weasy2k08-16-2006, 05:53 PMif 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 Node08-18-2006, 11:11 AMI 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. Weasy2k08-18-2006, 06:23 PMThe 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 :) Oteck08-27-2006, 04:00 PMwell 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 Weasy2k08-27-2006, 09:31 PMyea you were at 22% trim :) I love that little thing.

Things to note too:

Your Timing was going from 13-19 non stop just boucning around.
Fuel PSI was corrected
Removing power to each coil caused the engine to go unstable so all the coils are working.
The cam and crank signals are running ok...

The ONLY thing i am unsure on is that when we put the 2 cam sensors on and recorded it with the scope they did not turn on at the same time.....
IE:
----------/\------ 1
-------/\--------- 2

Does anyone know if they should be bang on to each other? Or is the timing off? Oteck08-27-2006, 10:42 PMfrom the bgb the shouldn't be ontop of each other, rather overlap halfway Weasy2k08-27-2006, 11:50 PMwell they wernt even doing that....

I gotta upload the picture from laptop Toysrme08-29-2006, 11:01 PMStock fuel pressure on the returnless system is 44psi idling & 50psi on gas.
The 3.3L combo off the bat is going to want 10.5% more fuel across the board. By cutting them down to 40psi, they've reduced the fueling across the board by 4.583%. So it'll still probably be wanting to run 5-6% richer than expected.
Keep in mind the 1mz's MAF may not be able to measure the new found draw accurately, and that the 1mz's ECU may not be able to read the higher MAF data, even if the MAF outputs it.

When you put the engine in diagnostic mode with a scanner. Ignition timing oughta be 8-12*btdc. If you don't do that, it'll fluctuate to help stabalize the idle. Otherwise it'll bounce between 7 & 24*btdc normally to keep a reliable idle speed. (It's easier to change the timing than make lots of big changes to the throttleplate / idle valves.)
I wouldn't worry about the timing. I have no idea on the cam signal. Weasy2k08-29-2006, 11:29 PMTHe fueling is nnot an issue...regardless of the displacment/ecu combo the fuel requirments are met...the ecu uses the o2 sensor to trim the fuel..so if the ecu came from a 3L engine (which it did) and put on a 3.3L engine (which it was) the need for more fuel is changed and the ecu will just take readings from the O2 and trim accordingly...remeber this is a OBDII system as well not a simple OBDI and its pritty smart :) Oteck08-30-2006, 01:20 AMyeah, sometimes too smart specialy when you stick in a piggy back. it tends to relearn everything, undoing what the piggyback is doing Weasy2k08-30-2006, 10:41 AMThats for people who dont know how to tune with piggy backs :)

SMT6 in a OBDII system for 3 years...no issue Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.

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