Question about Chevrolet Silverado 1500

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Has rough idle as soon as it opens it sounds like its sucking to much air and even spraying carb cleaner in it. The engine still stalls. Fuel pump works, press. regulator works, plugs and wires new, new coils, new crank sensor valve. Just before it stalls volt gauge drops to like 10 and its a new battery and alternator. Numb. 2 knock sensor been acting up for awhile and sometimes it backfires.

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Hi and welcome to FixYa!

It can be a MAF (mass air flow) sensor issue. If the MAF is faulty, vacuum irregularities can be expected. I strongly suggest that you have the MAF checked and replaced if necessary as a first course of action.

Hope this helps and thank you for using FixYa! Have a good one!

Posted on Mar 12, 2011

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Posted on Jan 02, 2017

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As soon as i start the car, it idles very roughly and slowly until it finially stalls out. I push the gas to bring the rpms up but as soon as i let go of the gas it stalls out again. Any ideas on what the...


The IAC; idle air control valve, controls idle speed. This may be gummed up or faulty. But first check for vaccum leaks. These can occur at hoses, fittings, oil cap, dip stick, gaskets. buy a can of spray carb cleaner and clean the butterfly valve and bore, IAC, and use the rest of the can to search for vacuum leaks; run the engine and give short squirts of carb cleaner to the items listed above. The engine idle speed will change when you spray on a leak.

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Shut down


try this.
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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Rough idle(rich) stalls in gear


Basically clean up before use like opening the plugs and adjusting the spark gaps, spray some carb cleaner at the intake & if The soud of the engine smoothens even slightly, then add some it to the fuel in the fuel filter & gun the engine a few time. Flush the radiator and fill in frsh coolant/water. Check the level of water in the battery and top up with distilled water. Clean the air filter and check fan belt tightness. After these small maintenace checks it should run OK.......sodeep

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My 99 Honda Accord keeps stalling after warmed up and relay for fuel pump starts clicking rapidly, what could cause this?


Low / uneven idle problem can cause by a lot of components.

Dirty air filter

Dirty injectors + o-rings

Vacuum leak at intake manifold and vacuum hose.

Bad Idle Air Control Motor (IAC)

Low compression (170 psi + is OK)

Start cleaning and repair these trouble spots and see is there any improvement.

====

For more advance DIY'er then you may try this.

Use a can of Berryman carburetor clean to locate the vacuum leak.


SEE SAMPLE PICTURE HERE


This is a 20-30 minutes job.

Vacuum leaks can occur in following locations.


Intake manifold AND/OR vacuum lines.


Intake manifold is not accessible unless the engine head if off.

You can still check the potential leak by spraying some Berryman near the intake manifold.

Listen for rpm increase after you introduce the Berryman (FUEL) at idle.


Do the same starting from the brake booster unit (the round unit) on the drive side fire all.

Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.

Get a friend to HEAR the ROM increase or monitor for RPM on the tech.

DO NOT AIM the Berryman into any heat source.


PLEASE RATE my answer if it is useful to you.

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this is a dirty idle air control valve, clean it using the following procedure.
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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TRY THIS BEFORE U SPEND ANYMORE MONEY N PARTS.
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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Running rough/service engine soon light


SOUNDS TO ME LIKE THE PCV VALVE MAY BE STUCK OPEN OR THE VACUUM LINE ON THE THROTTLE MAY BE SUCKING OIL INTO IT. PULL OFF THE AIR INDUCTION HOSE AND LOOK INSIDE THE THROTTLE BODY TO SEE IF THERE IS THE PRESENCE OF OIL.OPEN THE PLATE AND SPRAY GOOD CARB AND CHOKE SPRAY INSIDE WITH AN OLD TOOTHBRUSH TO CLEAN IT OUT. SOAK IT UP WITH A CLOTH RAG. WAIT A FEW MINUTES TO START CAUSE IT WILL HAVE TOO MUCH FUEL IN IT TO START. HOPE THIS HELPS. LET ME KNOW PLEASE. BEST OF LUCK.

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1 Answer

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hard start is AM is most commonly caused by a defective fuel pump pressure check valve, the other stall is issue is covered by the following procedure.
Here are some of the causes 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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Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk 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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2002ford truck explorer when i frist start my truck it will stall out a few times then wiil run good for awhile then for some reason stall out 3 or 4 times some times i can drive for 150 miles with no...


it sounds to me that you idle controll valve isnt responding (could be dirty) get a can of carb cleaner and clean the thottle body inside and with the engine running. squirt just a little and the engine will start to stall and the idle air controll will start to open ( you will hear it start sucking) then spray more in sperts try to keep the engine running at idle . this will make the engine RPM's change and open and close the idle controll valve thus cleaning it. when done save some carb spray. put the air cleaner hose back on. and start the engine and with the engine idling spray around the intake and base of throttle body if the rpms change you have a vaccume leak than will need to be repaired.
good luck
tech rating 3

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