Question about 2001 Mazda Protege

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Low idle speed and surges at idle runs ok at hiway speed

Has idle codes egr codes

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Clean the EGR valve and make sure it has current. replace with the exact part number and for your particular car if you have to replace it. But first check the idle position sensor located near the fuel injector system at the top. It has a plug that you remove.

Posted on Feb 06, 2009

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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?

especially?
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

1 Answer

Very low idol doesn't stay running idol goes up an down engine cuts off


typically this vehicle utilizes a map sensor or what is known as a speed density system the vac operated devices that draw enough to cause it to stall are the 1. brake booster 2. pcv system 3.any of the rest of them would cause a fluctuating idle but the pcm could compensate we know the idle air control system is working because the idle surges so i would first remove the fresh air hose from the throttlebody the dry dirt around the butterfly valve accumulates chocking the airflow off and causes a low idle this is known as coking and is very common also check for EGR codes if egr solenoids 1 or 1,2 or 2 or 3 are stuck open this will cause a low unstable idle or stall and the tps voltage at idle should be checked 3 wires 1 wire should be ground 0.v 2nd wire should have a 5v reference and third wire is what is known as signal return it should read at idle around .5v to 1.v if it is not in this range then it will cause the same symptoms

Dec 06, 2012 | 1995 Chevrolet Lumina

1 Answer

Acceleration problems ,at hiway speeds, needing more speed car downshifts sputters misses then eventually snaps backto normal whats up?


Ok. I'll give you my best guess, although I am not a Dodge Stratus expert. Based upon your description of the problem, I am to assume that the vehicle has problems accelerating up to speed, but once there, cruises ok unless you are going uphill or need to accelerate quickly, then power falls off rapidly and acceleration returns very slowly. If that is accurate, I would suspect the EGR valve. This is because at ihighway cruising speeds the EGR valve is pretty much wide open, letting exhaust gases back into the intake. When you need to accelerate, pressing the accelerator results in intake vacuum drop. This is partially compensated for by closing the EGR valve. If the EGR fails to close or sticks partway open, the exhaust gases will lower intake vacuum even further, and rob engine power. This can also cause the onboard computer to force a downshift to the transmission, as vacuum sensors are used to determine engine loading and the need to reduce gearing. In addition, a partially open EGR valve can cause erratic idle as it affects static intake vacuum (EGR is normally closed at idle) and the onboard computer must continually compensate, resulting is unstable idling.

Dec 04, 2011 | Dodge Stratus Cars & Trucks

1 Answer

Has low power, surges @ cruizing speed, rough idle (code 32)


You can remove the egr and see if it has been sealing,and if it still moves.

Jan 29, 2010 | 1993 GMC Sonoma Club

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

1 Answer

I have a 99 gmc sierra 6.0(has 189,xxx miles) and I was stalled on hiway today, ran code p0300. had towed home and I replaced egr valve $185. now ran a code P0405 and will start and idle rough and kill...


CPoP0405 Chevrolet Exhaust Gas Recirculation Sensor A Circuit LowCode p0405 is EGR Sensor A Circut Low. I suggest you recheck your eletrical connections and make sure they are making good contact.

Oct 08, 2009 | 1999 GMC Sierra

2 Answers

Cobalt not running at low rpm.......


All are possibilities but EGR valve makes the most sense. It's famous for causing poor idling and/or stalling at low RPMS. Best of luck.
Greg

Jun 18, 2009 | 2006 Chevrolet Cobalt

2 Answers

Idle problem


check vacuum line--egr valve

Feb 22, 2009 | 1998 Mitsubishi Galant

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