Last post on Dec 14, 2009 at 1:08 PM
You are in the Chevrolet Cobalt
What is this discussion about?
Chevrolet Cobalt, Engine, Coupe, Sedan
#25 of 27 First, Third and Fifth...
Oct 01, 2009 (11:30 pm)
First one: The tire repair shop, had to take out a nail out of one of the treads, didn't go thru the sidewall. Luckly, it didn't puntion the tire. So far the psi is holding 32.
Third one: Will it be better to set all the tires at 36psi? On Thursday, of next week, I'll be hauling up to 400 lbs on a 443.5 miles drive. Will it still be safe enough? According to your cobalt, at 36 psi, what is your Cobalt mpg aveage?
and Fifth one: According to the driver's manual, my Cobalt should only use 87 brands, Will it hurt the engine if I use 89 brands (or Premium)? And one more question, sorry about asking too much questions, btw. Does Techron fuel system additive works? Since you been using it for years, Does it cleans the whole fuel system and what else does it do?
#26 of 27 Re: First, Third and Fifth... [pa356228]
Oct 02, 2009 (4:53 am)
The tire pressure varies 1 pound/sq in with every 10 degrees up or down Fahrenheit. At typical outside temps now of 60 degrees in mornings my gauge shows 35 or 36. It used to be 37-38 when mornings were warmer. I find the dash gauge shows one tire higher. Don't trust the tire sensors; get your own $1 gauge and set the tires yourself when cold. 36 should be good; pressure will increase some with tires warming up and especially with a load.
The Techron was an early additive package by Chevron sold at stations. BMW long ago when gasolines weren't carrying good enough additives in some cases recommended Techron. It was the same additives used by Chevron in their gasolines. Since then government intervention required better additives in all gasolines, including regular. I still use Techron rather than other over-the-counter brands just because I feel it works. A Cincinnati car repair talk show guy recommended it for cleaning injectors up until he went off the air a year ago. He owns a body shop and major independent repair place in a high end part of the city. He was a graduate of the local vocation school for the county. He knows his stuff.
It also cleans and protects the fuel gauge sensor potentiometer metals against deteriorating from sulfur in gasoline. GM had a few gauges that would corrode from that and give erratic readings. In the past decade when I would put it in and drive the car, the car seemed to run better after half an hour's driving. I believed it did clean up what some gasolines left on injectors. Then I used to buy cheapest gas and mix brands about half and half with known name brands. Now I buy Kroger's gas, Mobile/Exxon, and Shell. Rarely anything else. I don't notice as much effect after putting it in the last couple of years. I consider it throwaway money spent for the additive. If I didn't use it I would probably occasionally spend extra money and run a couple of fillups of premium Shell/Texaco, Mobile, or Marathon thinking I was cleaning up the fuel system with the supposed better additive package in the premium. (We don't have Chevron in this area anymore.) Since the car doesn't need premium, I would only do that for a couple of fills--the first fill had 87 octane gas mixed with premium while the second would increase octane above 89 for the mixture.
A little philosophy here: most stations mix premium and regular to get the Plus grade. So I'd rather just add some gallons of premium where I know I'm getting 100% additives and gas rather than trust their computerized mixing ratio and just buy Plus.
The Techron Fuel System Cleaner supposedly does more for the whole system; an identical looking bottle is called Techron Injector Cleaner and I believe it contains less additives overall because it's usually cheaper.
My personalized advice would be add a 12 oz bottle of TEchron to a low tank, fill with premium. Drive it down to half a tank and refill with quality brand premium. Then use regular of a good brand. Do that for your trip. Occasionally put in a few gallons of premium to fill your tank. Otherwise use quality brand regular to avoid alcohol in higher percentages which cuts gas mileage.
#27 of 27 idleing problems
Dec 14, 2009 (1:08 pm)
i have an 06 chevy cobalt ls and i have the same problems as you when i stop at a light, or turn the air or the defrost on the car wants to idle bad just wondering if you have found the problem if so i really need to know ive changed the map sensor and a few other thing still hasn't solved my problems the car is getting to the point were it will stall itself out thanks...