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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  • 38 Answers

Whats the temp?How do you know its overheating

Posted on Jul 18, 2009

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2002 buick Lasabrea custom service engine soon light code revi ew says multiple misfire detected


Multiple misfires can be caused by a few different things , intake manifold vacuum leaks , low fuel pressure , basic things like plug wires an spark plugs needing to be changed if hasn't been done already . How many miles on the vehicle ? If over 100,000 K timing chain an gear wear can also cause this . The powertrain control module (PCM) uses information from the ignition control (IC) module and the camshaft position (CMP) sensor in order to determine when an engine misfire is occurring. By monitoring the variations in the crankshaft rotation speed for each cylinder the PCM is able to detect individual misfire events. A misfire rate that is high enough can cause the three-way catalytic converter to overheat under certain conditions. The malfunction indicator lamp (MIL) will flash ON and OFF when the conditions for 3-way catalytic converter overheating are present.
If the misfire is random, check for the following conditions:
?€¢
System grounds


Ensure all connections are clean and properly tightened.


?€¢
Mass air flow sensor


A mass air flow (MAF) sensor output that causes the PCM to sense a lower than normal air flow will cause a lean condition. Try operating the vehicle within the Failure Records conditions with the MAF sensor disconnected. If the lean or misfiring condition is not present with the MAF sensor disconnected, replace the Mass Airflow Sensor Replacement .


?€¢
Damaged accessory drive belt or driven accessory


A damaged serpentine belt or belt driven accessory can cause engine load variations sufficient to set a misfire DTC.


?€¢
Air induction system


Vacuum leaks that cause intake air to bypass the MAF sensor will cause a lean condition. Check for disconnected or damaged vacuum hoses, incorrectly installed or malfunctioning crankcase ventilation valve, or for vacuum leaks at the throttle body, exhaust gas recirculation (EGR) valve, and intake manifold mounting surfaces.


?€¢
Fuel pressure


Perform a fuel system pressure test. A malfunctioning fuel pump, a plugged filter, or a malfunctioning fuel system pressure regulator will contribute to a lean condition. Refer to Fuel System Diagnosis .


?€¢
Fuel injectors


Refer to Fuel Injector Solenoid Coil Test .


?€¢
Water contamination in the fuel system can cause a single cylinder to misfire as well as cause a random misfire, refer to Alcohol/Contaminants-in-Fuel Diagnosis .


?€¢
EGR system


Check for leaking valve, adapter, or feed pipes which will contribute to a lean condition or excessive EGR flow.


?€¢
Extended idle


Excessive Open Loop operation caused by extended idling or short trip driving may leave deposits on the heated oxygen sensors. The deposits cause oxygen sensors to respond slowly to exhaust oxygen content, affecting fuel control and causing a misfire to be indicated at idle. This condition is not permanent. To determine if this condition is causing the DTC P0300 to set, review the Freeze Frame/Failure Records for DTC P0300. If the DTC P0300 occurs at high engine speeds, the condition described above did not cause the DTC to set. If the DTC P0300 occurs at idle or very low engine speeds and at engine coolant temperatures below 80?°C (176?°F), the condition described above is very likely the cause of the DTC to set. The deposits on the heated oxygen sensors can be eliminated by operating the vehicle fully warm at mass air flows above 15 g/s.

Jun 23, 2016 | Buick Cars & Trucks

1 Answer

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.
Overheating problems

Jul 16, 2015 | 2001 Chrysler PT Cruiser

1 Answer

Heater light flashing on 1997 vitara jeep not start


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
but in say UK not. so ... that to changes diagnosis BIG TIME>.

Feb 17, 2015 | 1997 Suzuki Vitara

1 Answer

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.

Sep 06, 2014 | 2005 Ford Escape XLT

1 Answer

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.

Apr 09, 2014 | 2000 Toyota Avalon

2 Answers

Engine fan not working


Could be low on coolant, the cooling fan motor, a relay, or the fuse among other things.
A mechanic would check for power at the fan motor after checking the fuse.
Is the check engine light on ?

Jul 05, 2012 | 2006 Jeep Commander

1 Answer

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.

Apr 13, 2011 | 2001 Audi TT

2 Answers

Misfires. I have a 1998 Camry 2.2 with 200K miles. The


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

May 22, 2010 | 1998 Toyota Camry

2 Answers

2000 accent keep getting check en light on codes 300, 303


try having the crank sensor tested and the coil packs hope this helps

Mar 04, 2009 | 2000 Hyundai Accent

1 Answer

Regular coolant loss, in Mk 5 Golf


Chris I would get the coolant system pressure tested and it might show up the problem

Jan 08, 2009 | 2005 Volkswagen Golf

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