Per Seafoam: (I'd use half a can. Then next time you fill up, add the rest)
How much Sea Foam should I add to my fuel?
For routine fuel system (gas tank to engine) maintenance, one can of Sea Foam Motor Treatment treats up to 16 gallons of gas or diesel fuel.
When greater cleaning is needed, add more Sea Foam – the more you add to fuel, the better it cleans!
When stabilizing fuel for storage, use 1 (one) ounce per gallon of fuel.
Don’t worry if you exceed these amounts: Sea Foam only contains petroleum-based cleaning and lubricating ingredients that CAN’T HARM your engine or fuel system components.
so I have a 2003 Mazda 626 and i was told to add this seafoam to my gas tank cause I have to replace my catalytic converters one or both and Was told this stuff would help a lot but I only have about a quarter of a tank and don’t know how much of this 16oz can to add to my gas tank but don’t have any money at this very moment to put anymore gas in my tank if anyone can help me as to how much of this seafoam to add to my tank with only a quarter of a tank of gas please help me ASAP??!!!
Lots of interesting stuff, scrolled thru first 8 pages. Will do some searching. Not sure if I am going to put in that CPS when it gets here. We have to try something. I might try resetting the computer. We are in a bush community in Alaska. Gustavus Alaska. Have to put the car on a ferry just to get it to Juneau and no Mazda dealerships there. Might do a new computer. The Immobilizer is out I think due to our location. I have not even found the box, but my guess is it does have one. I wonder if Mazda USA has a tech support line, my friend who owns the car would be happy to pay for tech support right now. Had a suggestion to look at the pin out of the computer and figure out which wire goes to ground and either trace that wire or just tap into it and put an additional ground to frame. The splice would be close to the connector. Couldn't hurt. But if the computer was not seeing ground, there would be all kinds of bells and whistles happening so that a long shot.
Just want to ad, the manual is wrong on how to manually run the fuel pump. It says you jump pin 30 to ground under the fpr. you need to put 12v on socket 30, either straight from the battery or from socket 87
thanks! I see these had been at least one other member here with a crank/no start with the same issue of the fuel pump running when jumped, but not running on normal start attempt due to the ecu/pcm not providing a ground to pin 85/lite blue wire on the fuel pump relay. At least I think it was this site. where ever it was they never reported back with what fixed it. once we figure it out I will report back with the fix.
I pulled the two side panels on each side of the center counsel and looked under the steering wheel. I couldnt find the ecu/pcm or the immobilizer. I am in alaska and I am out of data in my phone until friday. might have to get a friend to download that manual. The 2001 book says the ecu/pcm is behind the radio? and my internet searching says the immobilizer is under the steering wheel? This car is kicking my ass