Question about 2001 Toyota Celica

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Rpm surges from 1000 to 2200 cold or hot. its full of coolant and could not find any vacum leaks

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It's a typical problem on Hondas and as Toyotas are of similar design, here's how to fix 'hunting' as it's called.

Cheap way first - radiator cap off, jack it up so the rad is higher than the engine. Start engine and let it get up to temperature, let the fan kick in twice, top up with coolant if the amount drops. An air lock will cause your symptoms, this is to bleed any air bubbles in the system.

On the intake manifold there is a valve, take off the air filter and housing. Get a cloth/toothbrush (an old one!) and clean the valve.

Get some carb cleaner, and spray it inside, with the engine running. I think a whole can does it for around 10 minutes.

Reset the ECU by removing the battery leads for 30 mins.

Drive off with a smile on your face and vote me 5 thumbs up :)

Posted on Jul 08, 2010


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When I start my odyssey it starts surging. I found a small rubber hose on the right side of the engine, but don't know where the other end of the hose goes....Help

WHAT COUNTY???????????????????????????????????
hot engine, cold or both?/// a key question
WHAT ENGINE: ( usa list , ONLY)
2.2 L F22B I4
2.2 L F22B6 I4
2.3 L F23A I4 2.3 L F23A7 I4
the fsm covers this. hose thing.... all hose can be followed,
unless its axle vents on 4wd cars. (they go no where, special)
is surging the only symtom.?
no engine stalls.?
lack of power in any gear or hills.
no misfiring?
no flooding.?
starts easy/?

ok what is surge, that it really is idle controls bad or out of comtrol
1: idle controls bad. (isc dead?)
2: or engine is running way too lean, and ISC cant keep a grip on idle.

easy huh?
and #3 misfiring so bad the idle controls fail.
are all fuses good?
is the CEL lamp glowing , then goes out running engine.
no , the scan it. or do the flash DTC codes trick.

a good tech ,first finds out if the engine holds closed loop status
hot. at idle, if not, he fixes that first.
as he/she knows that idle is the last thing to work right, in EFI.

one other way to get surge is air leaks (aka. vacuum leaks)
if the engine (unsaid option) is MAP based, it will race fast
with any vacuum leak, and it dont take much of a leak
to make the ISC idle controller go nuts.

so repost , hot/cold both questions
and actual RPM numbers. we need numbers
is the dash Tachometer missing. ????
and what engines in car.

all lean engines surge.
all ISC systems can surge if out of control , not all do this. just 1/2
if the ISC surges, it means its trying hard to gain back control.
this is called a software servo loop.
The ECU is programmed to hold rpm near say 800 RPM hot.
and is very digressive in that role.
I have a 91 car that will surge, with any vacuum leaks.
(by design) depends on which engine.

Feb 15, 2014 | 1995 Honda Odyssey

1 Answer

Increase then decrease idle when engine is cold especially

cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
running summer fuel in winter (running old fuel?)
needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
surge , causes, on a tuned engine might be:
1: too lean. so lean the ISC can not control idle. rpm low, stalling
2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

Oct 28, 2013 | 1996 Honda Prelude

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Does the 1998 oldsmobile aurora have a bleeder valve for the cooling system?

4.0 'shortstars' do not have a bleeder screw, they are filled at the surge tank which is higher than the coolant anywhere in the engine compartment-fill it to the full level when COLD, and check for pressure in the system when the engine is hot (squeeze the top hose, it should be solid, not easy to callopse). Your surge tank also holds pressure so your cap has to seal tightly with no leak through the overflow tube.

Apr 19, 2011 | 1998 Oldsmobile Aurora

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Surging RPM Hot restart on Chevy Beretta

Change the coolant sensor,and try lucas fuel treatment to clean the injectors.

Jun 08, 2010 | 1996 Chevrolet Beretta

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Long Crank Time When Hot

Timing belt/chain may have been put it slightly off time, when motor rebuild

Jan 13, 2010 | 1993 Dodge Spirit

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You might have air in the lines, go ahead and find out if there is a bleeder valve. If so then bleed it after warmed up but watch out that steam is hot.

Jan 03, 2010 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

When heater is on, only cold air blows out. Even with the thermastat set to red.

Usually, if your not getting heat it's because the cooling system for the engine is low on coolant. It could be the heater control cable too, sometimes they break or come unhooked. Does it feel like the lever is doing something you should be able to hear the little doors open and close inside the heater as you move the levers back and forth. Pay close attention when moving the temp lever, listen for movement inside the heater. Also, some systems are vacuum operated and you could have a broken vacuum line. The vacuum systems will usually go into the defrost mode if the vacuum line breaks or comes unhooked. Make sure your cooling system is full, keep in mind if you are adding coolant to the surge tank (the semi-clear plastic one) it won't draw that coolant into the radiator until the engine is in the cool down mode. The best way to check the system is when it's cold, if there is no coolant in the surge tank, remove the radiator cap and fill the radiator first. Then replace the cap and fill the surge tank to the "cold full line" then run the engine until it's fully warmed up. At this point the coolant in the surge tank should be up to "hot full line" if not add some more to the surge tank. Now let the vehicle sit until fully cooled off (overnight) and check it again, repeat if necessary. If your losing coolant at a rapid rate you better figure out where it's going, It can get into the oil, if you have an internal leak. Check the oil, is it way over full? Pay close attention to what type antifreeze you have, different manufacturers use different coolants, do not mix, green with pink or pink with yellow. Stick to what ever color you have they are not compatable with one another.

Dec 08, 2009 | Chevrolet S 10 Cars & Trucks

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