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Problem with engine hesitation, might be simple.

26 messages,  Last post on Oct 02, 2009 at 4:53 AM

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#1 of 26 Problem with engine hesitation, might be simple. by pa356228 Apr 19, 2009 (11:05 pm)
I have a 2006 Chevy Cobalt LS (4 door-sedan) with 52,800 miles. Sometimes when I slow down and stop at a street light (not a speeder and don't stop fast), it seems like my car wants to stall. When I get moving again it's fine, it could be a simple thing to fix but any suggestions?   I change the oil, oil filter, air filter, carbon air filter every 3,000-3,500 miles but, still seems like something else is clogg. None of the sensors comes on. Don't want to take my car to a chevy dealer to get service if I don't have to. Trying to save money. Anything is helpful. Replies to this message: laserblue (Apr 20, 2009 3:10 am) pa356228 (Apr 20, 2009 11:47 pm) laserblue (Apr 21, 2009 3:50 am)
#2 of 26 Re: Problem with engine hesitation, might be simple. [pa356228] by laserblue Apr 20, 2009 (3:10 am)
Replying to: pa356228 (Apr 19, 2009 11:05 pm) When was the last time you got a good tune-up done on your Cobalt?  Clean the injectors, change the spark plugs (even if G.M. says only at 100,000 miles), check or change the wires (might be damage)?   It's nice to change all the filters but there's a little more to it. Replies to this message: pa356228 (Apr 20, 2009 11:47 pm) laserblue (Apr 21, 2009 3:50 am)
#3 of 26 Re: Problem with engine hesitation, might be simple. [laserblue] by pa356228 Apr 20, 2009 (11:47 pm)
Replying to: laserblue (Apr 20, 2009 3:10 am) Ever since I brought my car (March 2006) I never had a complete tune up on it, besides the basics. Change the spark plugs about 3 weeks ago, at first, it didn't want to start. After a few tries, my car finally did start. The wires are in good condition, also the hoses, clamps, gas cap, and couple of bolts needed tighten. Never clean the injectors, though. Or the fuilds.   Going on a vacation on April 29, 2009 to Pennsylvania, It's going to take 8 hours of driving or 450 miles. Do you think it is the injectors that could be causing it? How can I clean them? Replies to this message: laserblue (Apr 21, 2009 3:50 am)
#4 of 26 Re: Problem with engine hesitation, might be simple. [pa356228] by laserblue Apr 21, 2009 (3:50 am)
Replying to: pa356228 (Apr 20, 2009 11:47 pm) Pep Boy or Auto Zone must sell what you need for that. I've seen people do it by themselves. You plug this injector cleaner (it looks like its a bottle) somewhere on the engine and start the car and it seems to do the job by itself as the engine runs. I usually go to the dealer but you seem to like to do your own work on your car.
#5 of 26 Waiting on results. by pa356228 Apr 21, 2009 (10:56 pm)
Did try the injector cleaner, it seems like it's working. I'll give it 2 days to see results. The engine runs alot quiet now. Hopefully it works, thanks. By the way, sometimes the "check gas cap" sensor comes on once in awhile. Do you think the hesitation has anything to do with that also? Replies to this message: laserblue (Apr 22, 2009 3:39 am)
#6 of 26 Re: Waiting on results. [pa356228] by laserblue Apr 22, 2009 (3:39 am)
Replying to: pa356228 (Apr 21, 2009 10:56 pm) It's possible and probably it is.   With today's electronics and computerized gadgets in cars anything is possible.   I had a car once and at every fill-up I had to turn the gas cap at least 3 full turns (clicking sound) if not my "check engine" light came on.   The first time that this happened to me it cost me 10$ at the dealer to know this and to reset the system. The mechanic said I could do it by myself by turning my key to acc. 40 times "non stop".   Go figure!
#7 of 26 re Waiting on Results by pa356228 Apr 24, 2009 (12:15 am)
Now I'm thinking of it, can't be the gas cap because did brought a new gas cap about 3 months ago locking method with key lock. On cap, it says 3 full clicks to lock. (probably with the same one you have also) About a month ago, when left the driveway, the gas cap sensor came on. But, the hesitation started in june 2008, the car dealer service department couldn't fine anything wrong. Yet It still pass inspections and pre-trip inspections from this day. (I drive 18wheelers)   Anyways, the injection cleaner (so far) is working. At street lights fully stopped, the engine runs alot quiet than what it was running before couple of days ago. Not sure if it did the trick or not, but it's helping. I'm going on a vacation on wednesday leaving VB,VA to Pittsburgh, PA (450 miles/8 hrs) it will be a long trip. Of course, driving, rather drive anyways. Getting an oil change before going up and hopefully it does fix the hesitation this time, could use your advice more. Can you think of anything else that could be causing it? Replies to this message: poncho167 (May 01, 2009 7:22 am)
#8 of 26 Re: re Waiting on Results [pa356228] by poncho167 May 01, 2009 (7:22 am)
Replying to: pa356228 (Apr 24, 2009 12:15 am) Be sure to use could quality gas instead of the cheap stuff.
#9 of 26 Re: by horsey55 May 01, 2009 (4:42 pm)
Good point, I run Shell V-Power 93 or Kwik Trip 91 for you Midwesterners with no ethanol and I will consistently get about 2 MPG better than ethanol lased regular.  I am currently running 150 miles a day. Doing my motor good.
#10 of 26 Something occurs a problem now. by pa356228 May 16, 2009 (8:11 pm)
Just got back from vacation 2 days from Pittsburgh, PA, the engine hesitation have gone away, but now something else occured when I came back. I think something is wrong with the transmission. Anyways, no matter what speed I go, when I need to slow down to make a stop, of course the rpms will go down. But around 10-5mph the rpms goes up another 100 and then goes down to normal. Then the light bulbs dimmers for a few seconds. There is no leaks, and in the vehicle menual, it says to change transmission fluid and filter every 50,000 miles. My car now has 54,944, probably it is time.   Before I do get it change, any ideas on what else could be causing it for I can find alternatives without having to spend alot of money. Any feedbacks is helpful? sorry about asking to much questions?

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