Mondeo idle - Pulse Air Injection?

Question

1994 1.8 Petrol Mondeo with a lumpy idle - seems to increase then immediately decrease revs (constant looping) approx. twice a second, a sort of rythmic hunting. Revs only increase by 2/300RPM - not too noticeable on tacho but definitely very audible..

Also has a beauty of a metallic 'rattle' between 2250-2750RPM which, after reading

formatting link

AirInjection, has made me dread spending more money... So far I have changed the Idle air Speed Control Valve and the EGR valve (diagnostics machine said EGR fault but diagnostics machine's expensive!) with no difference.

Has anyone heard the noise when the Pulse Air Injection's faulty on these engines? Does it sound similar to a 'rattling' exhaust or maybe a heat shield? Does it rattle when hot AND cold and can it make the noise only between certain revs?

Thanks for any answers - have already spent too much on this car in comparison to it's value, but I need to get it running/sounding ok before I can sell it...

DuncanWood · Accepted Answer

It's worth checking the state of the HT leads & the plugs before worrying  about the expensive bits

Pete Smith · Answer

[snip]Bearing in mind that Ford OEM plugs were =A375 a set (+VAT), and the leads==20were pretty much the same, 5 years ago when mine went :-)Pete.--=20NOTE! Email address is spamtrapped. Any email will be bounced to youRemove the news and underscore from my address to reply by mail

JK · Answer

Under the coil pack there is a Rubber "T" vacuum hose.... it is bust.

Tony Bond · Answer

Bearing in mind that Ford OEM plugs were £75 a set (+VAT), and the leadswere pretty much the same, 5 years ago when mine went :-)Pete.I bought NGK plats for my Zetec Mondy, £15-ish for 4. The original"Motorcraft" leads were less than £40 for the set from my main dealer. Lookslike Ford prices are dropping ;)

Tim (Remove NOSPAM. · Answer

[snip]Bearing in mind that Ford OEM plugs were £75 a set (+VAT), and the leadswere pretty much the same, 5 years ago when mine went :-)Blinkin heck! Surely you meant £75 for the plugs *and* the leads from Ford?If not then your dealer is taking you for  a ride- my local dealer does theleads for around £30+vat and the plugs for £20+vat.- i;'ve had several setsfor various cars.Tim..

Stevie · Answer

Thanks JK - it was the rubber T-piece which had a hole right on the'cross' of the 'T'.Cost £3.50 for a new one and the engine idles perfectly again.

Steve Sweet · Answer

Hi PeteBearing in mind that Ford OEM plugs were £75 a set (+VAT), and the leadswere pretty much the same, 5 years ago when mine went :-)You were stuffed, i paid £25ish for a set of platinum tipped, cables werearound the £40 mark.

Mondeo idle - Pulse Air Injection?

Join the Discussion

Didn't find your answer?