Question about 2000 Mazda Protege

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2000 Protege stalling when it's hot out then wont start.

My Car is stalling when ever it gets above 80 or so degrees. After it stalls initially I have a hard/impossible time trying to get it to turn over again.I have replaced the filer, checked the vacuum hoses, cleaned the Exhaust Gas Recirculator, cleaned the solenoid on top of the throttle body, checked the connections to the battery and the plugs, It is an intermittent problem and I can't isolate what is causing it, if anyone has had this problem or knows what it could be I would really appreciate some feedback.

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Usually a running problem when a car is hot can be caused by a bad ignition module. next time it wont start check to see if you have spark. if not i would try replacing the module.

Posted on Jun 25, 2009

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Posted on Jan 02, 2017

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The car turns on, after 3 or 4 seconds the car shuts off.


expensive guessing there ,wow !

why not find out why ,by using diagnosis, its far cheaper, i promise.
engine stalls:
A: can you save the stall>? with a fast right foot action????
yes, then its not 12vdc power lost to EFI system.
no, then it must be lost spark or lost fueling or flooding.
did you do the full 60k mile tune up yet? and the 90k? ever interval?
your mech. can't find this? is that what you are asking.???

stalls list, near impossible to answer not knowing, test A: above !
but here goes.
1: lost 12vdc power, EFI dies. engine dies. volt meter saves day.
2: lost spark, (cant save stall, test A, for this or lost 12vdc)
3: lost fuel pressure , stall can be proven with using test fuel at stall point. (spray fuel into intake) below 30PSI fuel, on all cars is bad.
4; flooding, from too much fuel pressure, say over 60psi, causes flooding, leaking injectors, so an injector leak down and balance test shown in the FSM.
See soaking wet spark plug tips (free easy check)??? flooding.
fast foot easy prevent stall, ? yes, ISC stuck closed. clean it
harder fast foot save is EGR stuck open. clean it.
impossible fast foot save is , #1,2,3 above.

all above can be tested easy and with cheap tools.
the engine runs by order. "classic list"
do the tune up.
1: 12vdc to EFI ,key on, all the time.
2: engine compression at spec, or 150psi. 90k timing belt ignored?
3: good spark and timed right. (strobe light test)
4: good fueling (not lost , or flooding)
5: EGR not stuck open, ISC not stuck closed.

this gets most stalls.
if fuel pressure is at bad shunt levels, +60psi , due to the fuelpressue
regulators stuck closed. (in side tank it is so is fuel filter.)
the engine will flood , i check fuel pressure. way before any ECU swaps. infact i check all ECU inputs first. and fuel pressure must be in spec range too.
good luck.

Mar 02, 2014 | 2004 Honda Civic 1.7

1 Answer

Replaced iac valve engine will not idle


wow , no year stated. amazing....
which engine? size and gAS or diesel>?
stalls only hot?
is thermostat good and holding 180F or more???????
why gue$$ ?

Stalls have huge causes.
1: the ISC sticks is but 1 of 50 causes (have list, i pass)
misfire is the other
the EFI Tries very very hard to stop stalls, (opens ISC/IAC 100%)
if it can't. it stalls.
why did it stall, lots of ways.
Misfire from too lean or flooding.
EGR stuck open. is #1 all top DOG for stalls.
EGR can stick open, and when it does, it will stall

no the big questions, not ever answered here ever.....>>
can you save the stall with a fast right foot action.?
easy
tad hard.
impossible.
The answer here, can save tons of hard work.

and is the CEL glow key on, in the dash? Check engine light at key on
then stay out driving, NO< why not scan this car.
do not ever ignore this lamp, scan it or spend eternity fixing car.
buy a scan tool, and learn to use it.
learn how sensors. work and how they read.
learn what closed loop is. (if not in CL hot , fix that now)

if the engine drops closed loop, hot, at idle this means
fueling is out of control and idle is only a victim.
check closed loop status hot engine. and win.


here are all the steps 1 by one on a good engine.

this is just a typical 1.6L 16valve SOHC engine.
MAF based injection, here. any motor with maf , like this..
http://www.fixkick.com/ECU/Authority/A_Full_OBD2_scan.html


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mas airflow
coolent temp

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http://yourhandymanzone.com/Your_Handyman_Zone_How_To_Pages_Vehicle_Car_Zone_Cars_Trucks_Vans_Engine_System_Engine_Stalls_When_Hot.htm

Hope this helps! Brad

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