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Car stalling

 
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Old 04-11-2012, 07:37 PM
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Car stalling

My car has been stalling for a while. When this happens, everytime I push in the clutch, the rpm would drop to zero then the car stalls. This video is how it idles. There is no code, no pending code (I checked). However, sometimes it would just run fine, no problem at all. MAP sensor and both oxygen sensors have been replaced. Anyone please help!
Thank you!
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Old 04-11-2012, 07:53 PM
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Re: Car stalling

This only happens when you engage or disengage the clutch?


Is just the video - or is your idle below 500rpm?
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Old 04-11-2012, 08:08 PM
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Re: Car stalling

Not really. I usually realize it happens when I disengage the clutch, the rpm would drop to zero and stall. Then if I try to continue driving the car, it would jerk and hesitate, and it would idle like that. But there are many times when I just let it sit there, come back after several hours, and it would run fine again. This happens on and off. Some morning I come out and start the car and it would be like this, some other time it would be normal. The car is actually idling at lower than 500 rpm. And it might not be clear in the video but there is a lot of black smoke coming out of the exhaust.
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Old 04-11-2012, 08:15 PM
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Re: Car stalling

black smoke usually means burning slightly rich.


I've heard of these conditions before.... jerking and hesitation after stalling. Trying to remember what the cause was...


did this just recently start?

had you done anything to the car prior to this starting?
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Old 04-11-2012, 08:41 PM
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Re: Car stalling

It has been like this for about 4 months. The whole story is like this: (sorry it's gonna be very long, but I hope this would help you help me fix this problem) :D
I bought the car used about almost 2 yrs ago. It passed smog. The car ran fine until about 6 months ago, the code P0420 came up. Since I didn't have to do smog check for another 2 yrs, I just ignored the code, kept clearing the code. About 2 months after that, it got a little worse. The code P0420 came up every less than 100 miles after I had cleared the code. Then a little later the car started doing this. I kinda looked around and found out that whenever it did this, I unplugged the MAP sensor, plugged it back in and the car ran fine. I thought it was the MAP sensor, so I replaced it. The car ran absolutely fine for a month, then it started doing this all over again. I then checked the spark plugs, they were covered in carbon deposit. I also check both oxygen sensors and they were also covered in carbon deposit. I thought somehow the car was running rich. so I replaced both sensors and plugs. The car run fine again, for more than a month. Then again, this happens (but the code P0420 hasn't come up since I replaced the o2 sensors).
So beside maintenance, I only replaced the spark plugs, both o2 sensors, MAP sensor.
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Old 04-11-2012, 10:06 PM
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Re: Car stalling

hmm I would almost suggest cleaning your egr ports and valve if you have carbon buildup issues - and do a seafoam/ change the oil afterwards.


Still trying to remember and find what the main cause that i've read about in the past... it's an uncommon thing
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Old 04-12-2012, 09:40 AM
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Re: Car stalling

When was the last time you ever used a carb cleaner spray to clean the carb build up in your throttle body?

I had something similar to that and it turns out that i had to get a carb cleaner spray to clean up the carb build up. I also got a 10" stick and wrapped it with a microfiber cloth. Sprayed that cloth to death before sticking it into the TB to rub against the inner walls to remove any carb build up deep inside that I couldnt reach with my hands alone. Also spray some onto a cloth or use that same cloth you wrapped around that stick and clean the shiit out of that flap both front side and back of the TB!! It's a simple clean up and see if that helped to stop the sluggish and hesitating reaction.
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Old 04-12-2012, 06:04 PM
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Re: Car stalling

I actually checked the TB right after I bought the car (2 yrs ago). I was surprised that the TB was very clean. Haven't checked since then. Probably I will check it again this weekend. I also used seafoam a couple times for the past year. The thing I don't understand is some time it runs just fine, and every time I replaced something that I thought related to the problem, it seemed to fixed it (completely) for a while, then back to stalling again.
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