Hi my 2000 1.8 zetec has a rough idle,it starts perfect,but once warm seems to tick over @about 750 rpm and stalls easily.it has had a new lamda sensor and have reset the ecu,it also seems very thirsty i.e 1/4 tank = 70 miles,any ideas thanks.

 

I suspect an air leak, spray WD40 sparingly around the inlet manifold with the engine running and see if the idle changes.

Martin

 

I have the same problem with my 1.8, when idle it sounds like its ready to cut out? only when its warmed up though.

Keep the thread updated pal so will i if i find what the problem is, also will try the above!

 

Common thing is there is a vaccum pipe splits not sure of the exact location I think it's near to the air box.

Martin

 

Sorry if its a stupid question but where abouts wud i spray the wd40 on the inlet manifold?

also any other ideas on a rough idle? im gonna check out my ICV and see if it needs cleaning. I dont think its my cams as when they were fitted they were set up properly. Are they likely to need setting up again? Thanks

 

Cams will give it a rougher idle, I would check the vaccum pipe first as this is common for splitting, it's under the inlet manifold and has a 'T' piece (I think it's part of the PCV) also check the breather as well. As to the WD4O you want to spray it near the joint, the idea is if theres a leak the WD40 will change the idle momentarily.

Martin

 

mine is weird wen running warm and cold. if i feather the throttle and let off it nearly cuts off

 

my mk1 mondeo did that and was a vacum pipe leak. you could hear it if you listened sucking in air.

 

did you find where from

 

I also have this problem, on my 2.0 zetec, ill let you know if i get to the bottom of it, may help!

 

i have replaced the crankcase breather pipe as it collapased when the engine was running.it has evened out the tick over but it is still slightly low but less likely to stall. 750 rpm ish

 

What do you quantify as low?

Martin

 

what size pipe is the crank breather as would like a silicone one

 

This turned out to be some sleeving over a pipe had cracked, causin an air leak. quickly slide some new sleeving over, problem sorted. Just got to fix the heavy ass accelerator pedal now!

One more thing, if your car is drinking petrol it is likely to be this, as thats what mine was doing.

 

The part number for the PCV hose is 1337254 and the valve is 1026678. I have the 2 infornt of me now, just need fitting. It's fookin cold though lol.

 

Yeah i meant hosing not sleeving ha

 

around 750 rpm i think - last mark before the 1000 rpm number.

 

Yes that is perfectly normal.

Martin