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Car stalls occasionaly when stopping replaced crank sensor plugs, wires snd gas filter also raised idle speed. what should i look for?

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  • Cars & Trucks Master
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The idle air valve is the device that should control the idle and that is operated by signals from the engine management ECU from the information it gathers from the sensors.

Assuming there are no intake air leaks, the fuel pressure is correct and the engine basic settings and condition is all in order, the fault would indicate the idle air valve is slow to respond due to being "gummy" or perhaps there is a software problem.

It is also possible the injector spray patterns are bad, a condition that is likely to confuse the electronics. I suggest these are checked first...

Posted on May 06, 2017

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Posted on Jan 02, 2017

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You did not mention the throttle body or the idle air control valve.
The computer controls idle speed by how much air is allowed to enter the intake manifold thru the throttle body.
If the idle air control valve is faulty, or there is a vac leak, or the throttle body is dirty, the computer can not keep the idle speed at the factory setting.

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I purchased a 1997 chevy blazer ... looks great interior and exterior... but when I drive and stop, i have to keep 1 foot on gas pedal and one foot on break. what do i do ?


Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem get a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, spray it into the air intake of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is know clean, if you continue to have the stall out the idle speed control valve may be defective and requires replacement.

Mar 04, 2011 | 1997 Chevrolet Blazer

1 Answer

The car will pop alittle when you try to start it...It wants to start but wont..replaced the fuel filter,plugs.I have spark to all plugs..I can squirt gas into the intake and it will run but will not idle...


usually when a vehicle backfires, it is caused by the timing or a bad crank sensor. symtoms of a bad coolant sensor are--poor cold idle, stalling, ( rich mixture,retarded timing) slow idle speed, cold hesitation or stumble, and poor fuel milage. check coolant sensor first. good-luck!!

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1998 FORD CONTOUR CHECK ENGINE CODES P1131 AND PO171. REPLACED 1 OF THE OXYGEN SENSORS, CHANGED PLUGS, PLUG WIRES, OIL AND FILTER, ALSO REPLACED AIR FILTER AND CLEANED PCV FILTER, RESET PC AND IT RAN GOOD...


sounds like EGR valve and sensor this controls idle speed when at a stop. the po171 is a burn lean or rich code need to know what bank 1 or 2. also check for a vacuum leak from one of the hoses.

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1 Answer

2000 kia sephia constant engine stalling!!!


try this procedure and let me know if it cures the problem.

Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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Probably need a new idle control sensor.

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check the cam and crank position sensor making sure that there is no metallic deris

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