dohc idle hunting
 

ever since i swapped the sohc to a dohc, the idle speed is constantly surging. ive looked and found nothing for this problem. anyone have any ideas? thanks

check your intake piping, tps, and go to www.clubprotege.com and ask around...i believe someone is having a similar problem. also try searching

when you adjust the idle on the proteges or fords you have to jump two wires in the diagnosis box (around the brake booster area) when it is right the idle will increase then you can adjust it. If you have more problems get a repair book and look it up. if that is not it it could be a senor or a broken vacume line.

thanks
 

thanks guys. i did what you guys said. the intake pipe was a little loose and the timing was off 5 degrees. it defineately runs better but its still surging. could it be a vacuum prob? the mechanic who swapped engines took off the vics, could that be the problem?

^^^ yes, you need vics lol

thats what i said, but who am i to argue with a so called mazda master tech