Question about 1990 Toyota Celica

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1990 Toyota Celica GTS. Idle races too high

Car starts and runs great, but at idle rpms will race and stay at 1800-2000 rpms. Sometimes will surge up to 3000 and then come back down if you hit the gas pedal. Sometimes everything settles down and the car idles nicely at 800-1000 rpms. Can't seem to hear any vacuum leaks, but I'm not ruling that out. Any ideas?

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  • tomcelica Mar 28, 2009

    I have the exact same problem that is the worst when the weather is colder (I live in Buffalo.) My mechanic changed a motor that was supposed to control the amount of idel needed by the electrical system but this did not fix the problem. He changed the thermostat after it was noted that it ideled high on cold days but this did not fix the problem either. Recently after dthe car warms up the idel has occilated between mid 2000's and 800 switchin between the two roughly once every two seconds.

  • tomtran59 Apr 04, 2009

    My Celica has the same problem. It seems like the weather has some effects on idle speed. It is a little slower (1500 rpm) on sunny day and 2000rpm on cold day. It's really weird. Check all vacuum...no leak. Is it electronic problem?

    Has anyone fixed this problem?

  • Anonymous Mar 24, 2014

    Runs and idles great but when I hit the gas it surges

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Sound very much like a vacuum leak.... also maybe your timing is off? possibly advanced? try retarding it with the distributor if thats the case...

Posted on Feb 01, 2009

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97 toyota surges at an idle


(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
questions.?
1: hot or cold or both.?
2: low extreme RPM and high at idle.

400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
hot idle, if not , i fix that first.
keep in mind if not in closes loop and lean
all lean engine surge and guess what the ISC will add to the surge
because idle is way too slow, so the ECU open the ISC wider
and wider and its still too slow, so the ECU resets the ISC
this cause a worst hunt (surge)
the ECU adjust spark time and the ISC to get 800 rpm. (spec. look up yours)
so say , i see closed loop failed, OBD2 scan page 1
i look at the O2 sensor an its stuck lean.
if stuck lean and it really is (o2 bad?) then its lean and it will surge
.
examples.
1: i find 02 sensor bad, (only effects idle and light steady cruise)
2: i find fuel pressure at 15PSI , hopeless low .
3: i find all injectors clogged. and lean.
4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

the driving bog tells me,
1: scan the ecu ,get DTCs; do that first.
2: clean MAF if car has one, ask how..
3: check fuel pressure.


my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
MAF is air density EFI
MAP is speed density EFI.
apples and oranges diffr. so what engine.


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98 eclipse 2.0 idles high at 2500 rpms an I just replaced the throttle positioning sensor


sounds like you may have a vacuum leak. any air entering engine not passing through the throttle body will cause engine to race. a whistling sound is sometimes a sign of vacuum leak but not always audible. propane is the recommended method finding leak but I find this unreliable. spraying carb cleaner around suspect areas and listening for a rpm change is more successful. just remember carb cleaner is extremely flammable and caution must be used.

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Whats the max amount of miles you can drive on a 1990 toyota celica gts with the first engine?


If well maintained and with regular service this engine can last up to 150,000 miles. Remember, this means changing all fluids regularly, changing the hoses and belts regularly and just keeping the engine in tip top condition. No racing, no over revving, etc.

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I have a 1990 toyota celica gts 2200 motor I have changed the wiring harness caujse it was burnt and after replacing it wouldn't idle so we replaced the computer still the same so replaced the tbi and...


If you replaced the whole engine wire harness,make sure all connectors are hooked up , if they ok ,check MAP sensor and temp. sensor .it might be your problem.If possible swap them with known good used ones, or just try to disconnect it and see if it runs any better.

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My 1990 Celica won't stay at a steady idle. It will fluctuate between 1100 and 1800 RPMs every second unless I have it in a gear driving or rev the engine past 2000 RPMs.This started after getting it back...


Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

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1985 toyota celica gts idle when starting


it may be one of the water temp. sensors at the thermostat housing.

also check the plug, wires,distributer cap and rotor.

good luck

22re owner

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Car will suge and somtimes not idle properly


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