Semperboy

Hi guys, when i rev my zetec and totally let off the throttle the revs will drop to about 1500 and stay there for a second or two and then drop to idle, any ideas? ive had all the TPS etc apart so wondered if its the simple fact i havent reinstalled that right?

pani_k

iTrader: (1)

What variant of Zetec?

Idle valve or PCV and associated pipework that has perished are known to cause the above issue.

maxwax

yea as above and pain in the arse to change has 2 8mm bolts is located under throttle body on plastic manifold

Semperboy

its a 1.8 (130) silvertop buddy, should i just take the idle valve off and give it a good check then or what?

pani_k

iTrader: (1)

Yeah sounds like a good place to start as any. Give it clean out with some brake cleaner/degreaser then lubricate it back up again with a bit of WD-40 or some oil. I'm not overly familiar with the details of the silvertop 130s but the idle valve would be located on the inlet somewhere on the underside of it as per the blacktop if it is the same inlet setup. The PCV and pipework are located at the front of the block if the same as the blacktop and go around the side of the engine below the coil pack and behind the inlet.

Semperboy

Cheers, i'll get out in the garage again when its a tad warmer haha!