Question about 2001 Hyundai Sonata

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Car is bucking and lurching. Did major tune up and replaced air flow sensor. Now does it when cold start only. What to do?

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Check the bolts are tigth in the throttle body .

Posted on Nov 12, 2010

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1994 crown victoria engine races


Problem with idle speed. The idle is controlled by the pcm (engine computer) through the operation of the Idle Air Control valve or motor. But several other sensors are also at work, like the throttle position sensor, the coolant temperature sensor, the MAP sensor or the Mass Air Flow sensor. The computer monitors all engine conditions to optimize performance and driveability-this includes keeping idle speed correct.
Would probably help you if you could see what all those sensors are telling the pcm-so you need a scanner capable of giving live stream data. And don't forget, your '94 is OBD-1, not OBD-II like all cars since 1996 on have. A garage should have such capable scanners, but they are kind of high end, not your typical cheap code scanner.

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1989 cutlass ciera 3.3L, when starting cold, runs for about a minute then dies eventually when it gets warmed enough it stays running, idles erratically all the while its running, out on the highway as...


Hi and welcome to FixYa!
As a first course of action, I strongly suggest that you check the vacuum lines. If you have a worn out or disconnected vacuum lines these issues can occur. I'm suspecting the MAF sensor too. Before proceeding on replacement, please remove the throttle body and clean it with a carburetor cleaner till it's clear of carbon. Carbon deposits can make irregularities on the air flow.
If the problem still persists then go with the MAF sensor replacement. Hopefully, cleaning the throttle body resolves the problem to cut the cost.
Hope this helps and thank you for using FixYa! Have a good one!

Mar 25, 2011 | 1989 Oldsmobile Cutlass Ciera

1 Answer

Bucking engine


Check the fuel pressure,also change the fuel filter.check the crankshaft sensor,or replace.It sounds more like the tps sensor(throttle position sensor).It is mounted in line with the throttle axle,on the throttle horn.Of course .with out being there and checking I am just guessing.But map sensor or mass air flow sensor could also cause this.Have you checked the air filter?This will cause the problem,if it is stopped up restricting air flow to engine and mass air flow.,map sensor,and vacuums needed to run the car.If I can help,let me know.

Sep 23, 2009 | 1988 Oldsmobile Delta 88

1 Answer

Car would stall out at a light and bucked when it finally started


Mass Air Flow sensor is simple to install,right on top at air box.Shouldn't cost more than $75.00 in labor on ther high side plus the parts.The part is costly.It can cause stalling and other problems.Is it a 3.0 V6? Hope This helps

May 21, 2009 | 2003 Saturn VUE

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Idling to a stall or idling up to 3000rpm the lurches hard


i have the same car it was doing the same i change the mass air flow sensor now run like a brand new car but cost me arround 400$ but to make sure just buy the spray can to clean it you'l se if it run better or go for a scan in a car chop,I hope this gonna help you!...se ya!Patrick give me some news...

Apr 05, 2009 | 2001 Hyundai XG300

1 Answer

Lurching at low speed take off


I would start by cleaning the inside of the Mass Air Flow sensor, dirt gets on the sensor element from the air going through and causes these kinds of problems, a company called CRC makes the spray cleaner for MAF's, any good auto parts store will have it, the MAF is located in the air intake hose to the engine. Another thing to check is the throttle valve and air bypass idle speed control valve for sludge, use the following procedure I have written to perform this.
Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) 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.

Dec 04, 2008 | 1997 Toyota Avalon

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