Focus - No power, Rough idle - HELP!!! - Ford Forums

JonJ · 03-15-2007, 09:10

This problem has been going on for over 2 months and I dont have any hair left to pull out!

Basically there is not enough vacuum in the inlet manifold and it drops from 20 to 5 in 30 seconds and runs rough. If you touch the accelerator it will run smooth for about 30 seconds and then rough again.
I've had a new CAT and oxy sensor, removed ex manifold, removed inlet manifold, checked valve timing, removed pipes and hoses from manifold and plugged, sprayed carb cleaner around manifold and associated inlet components all to no avail.
Checked compressions while running individually also cranking. No fault even when idling rough. Removed cylinder head and reset valve clearances. Fuel delivery and fuel pressure all ok. Replaced fuel rail.
Replaced TDC, CAM, MAF, Head Temp sensors, accelrator position switch and knock sensor. ECU checked twice by different companies.
The auto gearbox has also been checked by a specialist.

Something else to mention is that a genuine Ford engine was fitted in August 06 by a Ford Dealer...

If anybody has ANY idea of what is going on here please let me know and let my life return back to normal!!! :(

Fordtech. · 03-15-2007, 12:44

What engine is this?

JonJ · 03-16-2007, 01:24

It's a 1600

any ideas?

Fordtech. · 03-16-2007, 09:28

If it's got a T-MAP sensor, these go faulty when an engine has been needed for compression problems.

JonJ · 03-19-2007, 02:19

It doesn't have a MAP sensor.....

Have you had a similar problem in the past?

Fordtech. · 03-19-2007, 11:51

We've seen plenty of Duratec engines go down, then return with the same symptoms requiring a T-MAP to cure. Also umpteen coil packs across the range. What model year is it? Surely there's a DTC in the module? I'd be doing a cylinder leakage test, it certainly sounds like an air draw or similar- is the CKP signal ok?