My car, a 2002 Camry 4 cyl, had seen cheapo gas for first 20K of its life. It had a very slight rough idle 'attacks' problem, with the AC on. It will idle smoothly, and all the sudden shake more for a second or so, RPM dips, and back to normal. I think probably a cylinder misfires and causes the 'shake attack'.
10K miles ago I used Chevron gas by chance once, and the situation improved. I have been on it since - for the most part, the idle is silky smooth.
A few days ago, I filled up with Chevron and a 20 oz bottle of Techron Concentrate (18.5 Gal tank). I am 1/4 tank into the treatment, and the rough idle is back.
Is this normal? My idea is the Techron probably loosen up additional gunk in the fuel line and it is clogging up the injectors a little, causing a little misfire ever now and then. Any thoughts?
10K miles ago I used Chevron gas by chance once, and the situation improved. I have been on it since - for the most part, the idle is silky smooth.
A few days ago, I filled up with Chevron and a 20 oz bottle of Techron Concentrate (18.5 Gal tank). I am 1/4 tank into the treatment, and the rough idle is back.
Is this normal? My idea is the Techron probably loosen up additional gunk in the fuel line and it is clogging up the injectors a little, causing a little misfire ever now and then. Any thoughts?