MR.T

thanks wadzii, good explanation. when i did it on my rover, i'd dip the tube to the bottom of the can, then use needle nose to suck a can worth in over a minute or so worth of time. then i'd let it sit for 30 min and go for a drive afterward. but i def see the danger of it puddling in the intake.

anybody wanna buy a case of seafoam??

michaelnyden

OP, I went through what you did. Compression was good, no bent valves, replaced and cleaned all that you did banging my head against the wall, the next step for some is looking at wiring and ECU itself. I was about to go down that road when I checked my TPS. Voltage was set wrong at idle. Check your voltage with throttle closed. Should be 0.3v, NOT 0.5v like all other Hondas and basically every mechanic and documentation says it should be. Another possibility is you have a ratty section in your TPS itself where the voltage output will be erratic. You'd have to datalog this or watch it as you slowly push down the throttle with the car not running but in the ON position or from the engine bay using the throttle cable. I had the exact same symptoms, no missfires anywhere but idle and no triggered CEL, only hidden/pending P1399. I see you solved it with seafoam, but most aren't this lucky and go literally through every suggested fix, I know I did and finally came to this, so hopefully this may help someone else who has already gone through all the usual checks.

Nelsons2k0

Guys i didn't actually have the car running with the seafoam, i just let it soak the pistons to eat up the carbon build up. I vacuum it out and let her dry. Its a petroleum based product that doesn't harm your engine. I know some people will say I'm going to blow up my car or whatever but I've used it on at least 6 different types of cars and trucks with all positive outcomes from 10miles after to 10k miles after use. To each there own i say =]

Nelsons2k0

Billman i also did a leak down test, i got 3% 2% 2% 3%.