Question about Toyota MR2

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My mr2 is idling too fast.i have tried all the obviousadjustments.is there some secret formula or adjustment screw im missing?i cleaned the throttlebody & the iac. adjusted the tps etc. any ideas?

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  • 94 Answers

Check all the small vacuum hoses for leakage or loos fit, check for damaged or broken air intake hose. Check if there is anything loos between throttle body and cylinder head, like broken gasket, craks or so. Idling is adjusted by the ECU and there are no screws anywhere. In most cases, lost vacuum is the reason for high rpm at idling. In some cases it's possible that an O2-Sensor or the cat is bad, and the ECU tries to adjust but get the wrong signals.

Posted on May 15, 2014

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Posted on Jan 02, 2017

emissionwiz
  • 74945 Answers

SOURCE: nissan ga15 engine idle adjustment locations

The idle speed is computer controled, it is not adjustable, you most likely have sludge in the throttle valve and the idle speed control air bypass valve, clean them with carb spray with the engine running.

Posted on Sep 17, 2008

  • 18 Answers

SOURCE: 1994 Toyota pickup 22RE with 121K miles

check for a air leak in you sistem, or check for aditional idle screw adjust in the another end af the accelerator propel

Posted on Nov 02, 2008

  • 1 Answer

SOURCE: Erratic Idle problem in 91 accord

THE DISTRIBUTOR WILL CAUSE THIS PROBLEM IN A HONDA TRY A KNOWN GOOD ONE .

Posted on Apr 03, 2009

emissionwiz
  • 74945 Answers

SOURCE: fast idle after warm up .already changed IAC valve

fast idle is many times caused by a engine intake vacuum leak, use a can of carb spray and spray the top of the engine for leaks, if u hit one u will hear the eng change idle speed, also look for split or leaking vacuum hoses.

Posted on May 20, 2009

SOURCE: low Idle

Air Idle Control. No screw

Posted on May 31, 2010

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2 Answers

Im having low idle problems with my 1985 toyota mr2. how can i fix this so i dont stall out at red lights


adjust the carb ,if you do not how to do it then find older mechanic that does

Apr 30, 2010 | 1985 Toyota MR2

2 Answers

My 89 Mr2 idles low and stalls at times, is there an easy adjustment?


There are many solutions but I suggest simply adjusting the idle screw on the throttle body for now. Looking at the car, follow the from the air filter box (driver side in engine bay). You will follow a large black tube up to the engine. Where it becomes metal is the throttle body. Look for a large flathead screw in a hole facing directly upwards towards the trunk on this. Adjust it counter clockwise to increase idle, clockwise to lower idle.

Apr 25, 2010 | 1985 Toyota MR2

1 Answer

What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

Mar 29, 2010 | 1978 Chevrolet C1500

1 Answer

Pick up truck runs in park & neutral but,will not stay runnimg im drv.


Timing may be retarded.Check for vacuum leaks.If carburated, adjust idle mixture screws w/truck in drive(and someones foot on the brake) and/or fast idle screw.

Sep 16, 2009 | 1985 Ford F150

1 Answer

87 MR2 Lacks Power when Pushed to Full Throttle


Pull the Fuel filter, replace it, and fill it with B-12 Chemtools and hook it back up. this will clean the insides of the carb. Clean up the outsides of the carb and check it's adjustments. This can be done with a vaccuum guage. You adjust the mixtures until you get the most vaccuum off the intake. You want a solid vaccuum line off the intake and you will need to take the mix screws all the way in and 1.5 turns out for a good starting point. And remember, if you move one you move the other. But check your timing first, it could be off.

Apr 26, 2009 | 1987 Toyota MR2

2 Answers

My caprice runs to fast...


pretty sure that year is throttle body fuel injected if so check idle air control switch may be stuck or passage may need to be cleaned cylinder shape located on throttle body but first check all vacuum hoses for leaks or cracks

Mar 31, 2009 | 1985 Chevrolet Caprice

2 Answers

Mr2 idles itself dead after it warms up and doesnt pass smog?


you need a new idle control sencer you can get from most auto spairs shops
hope it works for you
thanks acemasters

Jan 18, 2009 | 1986 Toyota MR2

1 Answer

Excessive idle speed


The problem may also be the automatic choke. It could be stuck in fast idle. check all choke settings and linkages clean if nessesary. There is a separate fast idle adjustment screw on the choke linkage that controls engine speed while the engine is warming up. The tip of the screw rests against a cam that slowly rotates as the choke opens during engine warm up. Turn this screw counterclockwise to decrease the fast idle speed.

Oct 20, 2008 | 1998 Jeep Cherokee

1 Answer

1995 pontiac firebird formula v8 idle


The idle speed is not adjustable, it is computer (PCM) controlled, you can turn the screw for the hard stop, but the computer will just over ride that adjustment for the most part, what I think you may need to do is clean the throttle valve and the idle speed control air bypass valve, use carb spray, spray it in the intake with the engine running use the at least 1/2 the can, the engine will try to stall, keep it running, after you are done disconnect the battery for 10 minutes, reconnect and drive a few days so the computer (PCM) can relearn your driving habits and set the idle correctly based on your driving.

Oct 16, 2008 | 1995 Pontiac Firebird

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