Question about Subaru Impreza WRX STi

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Car overheats when driven on boost only not at low speeds also misfire and cat light flashes not smokey or no loss of coolant when driven normally.with cap off rad water seems to rise and fall not overflowing lots of tiny bubbles both hoses hot fans working

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  • tonixdavid Jul 19, 2009

    its 93 80000 miles done .it misfires on boost and temperture rises on gauge when it starts misfiring if i drive slow it will drop again

  • George May 11, 2010

    What year ? And how many miles has it done ?

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Whats the temp?How do you know its overheating

Posted on Jul 18, 2009

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Car overheats and engine sputters like there is misfire. Hook it up to computer and got no dcd codes. I need help.


Assuming you have enough coolant in the car, try a new radiator cap first. If that doesn't fix it try changing the thermostat and seal.
If it only happens with the a/c on at low speeds the aux cooling fan is bad. There is a low speed fan and high speed fan depending on how hot the motor is. Both turn off at speeds higher than 35mph.
If it happens without the a/c it could be bad water pump, radiator fan or a cracked head. Cracked head could allow steam leaking into the intake causing misfire.
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what country, which engine>? G16?
where is this light. try to be exact, (on the HVAC controls)
or in the dash speedo cluster?
and we'd need to know if it has an icon, ?
better post , a real photo of lamp.
did you overheat the engine (coolant gauge needle , on H)

as the dash lamps vary by every country a vitara is sold.
the operators guide (glovebox) is the way to know what a lamp means. (warnings) and is unique to your country! fact !

i see UK cars (we are USA here) have CAT overheat icons.
(we dont have that here)
and means just that. (engine too rich and misfiring or rich and exhaust cracks, sucking air ) causing CAT to OVERHEAT.

no start. lets work that now.
ok, key on, CEL glows. (check engine light ) must glow
does it.
does engine crank? fast?
if yes, is the IMMOblizer lamp (dash) happy? (oper, guide again)
if cel on , Immo happy
then it cranks fast ,do you have spark to all cylinders of unstated size engine?

our cars the USA OBD2 scan tools all work in 1997
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Wondering if one or more CATS are pluged ??


Is there any oil in your coolant or coolant in your oil? (Oil would look like chocolate milk and coolant oil would be obvious. Sounds like a possible head gasket leak due to preignition or misfiring of the cylinders. Also double check the plug wires to make sure they are all on the correct cylinders. If two of the plug wires are reversed, it could cause this issue. The car should still run with out any cats but it will throw a check engine light. I'd bet it's either crossed wires, head gasket, and possibly a bad thermostat.

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A sudden loss of power like the engine was turned off (or short in electrical system suppling power to plugs), then, a slight surge, power restored. 'Short' is intermittent. Occurs at high speeds, but more...


It is possible, in fact likely, that your ECU (main computer) is failing. Less likely, you may have a bad oxygen sensor or other bad sensor. Best first step is take the car to your local auto parts store and have them use an ODB reader to determine the error causing your Check Engine light to be on.

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2002 Chevrolet Blazer won't accelerate past 30mph


A flashing check engine light means the engine is misfiring. This flashing light will eventually set a code in the low 300's. When you get the code it will tell you which cylinder. If you get a straight 300 it means multiple misfires. Right now if the light is only flashing, check the secondary ignition for loss of integrity. It's more than likely there. I hope this helps.

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Could be low on coolant, the cooling fan motor, a relay, or the fuse among other things.
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MY 2001 AUDI TT QUATRRO THE COOLANT LIGHT JUST CAME ON AND IS FLASHING. tHE CAR HAS BEEN RUNNING COOL ON THE TEMP GAUGE BELOW THE HALF WAY MARK C/H IS IT OK FOR ME TO DRIVE TO GET TO A SHOP. i AM NO...


hi.
if the light is flashing but the temp is ok, then the coolant level is low.
if it is low because it has not been checked in a while, then there should be a problem.
if it is low because of a leak or a broken hose then the car SHOULD NOT be driven.

best thing to do is top up the coolant with normal water and check under the car to see if there are any obvious leaks. if there are any, do not drive the car as the car will probably lost the rest of the water quickly when you are driving and overheat.

if you cannot see any obvious leaks, you should be ok to drive as long as the light does not come on again.

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Hi, my first recommendation would be to take the plugs out and visually inspect each one and check to make sure they are properly gapped, if they look fouled at all i would replace them without hesitation. try throwing a set of NGK plugs in the car to fix the misfires. other than that you may want to look at the wires. good luck joe

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