Rough idle i just replaced the timing belt on my 1999 ford contour, the idle is rough and the check engine light is on, any ideas ?

The timing is set by the ECU (Engine Control Unit), the computer that controls and monitors several engine and drivetrain functions. Timing is not adjustable without specialized equipment. If the engine is running rough like it's out of time, you might check to make sure the cam timing belt (on 4-cylinder engines) hasn't slipped a tooth. If the belt hasn't been replaced in a long time, it's probably a good idea to do so.

check egr valve

The Ford Escort ZX2, the 2.0 liter is a interference engine,The valve and the piston kissed each other as they met with a broken timing belt,Just to let you know a cam position sensor does not create rough idle, it can stall the engine at a stop sign,but the solution is a valve job, and who ever put the timing belt on after the job should have done a cylinder effeciency test.

At Auto Zone, ask for part number 34223. It is a bypass pulley that you can replace the a/c compressor with so you can use the original belt without issue.

Your new MAFS is not plug and play... you must clear all learnt data / fuel trim from ECU

Here is how:

Disconnect battery on + side, hold the + lead to earth (body, engine or chassis) this diffuses the system. Leave disconnected for 10 minutes, reconnect, start car and take on a 12 mile minimum drive (this is know as a drive cycle) pull over safely, switch off engine (new data now stores in ECU), start engine and happy motoring :o)

Lloyd

Replace the idle speed control valve.Very common on fords this fails.And what you are telling me are the same symtoms.Good luck m8.

CAUTION The 2.0L engine is an interference motor. Extending thereplacement interval could lead to the belt breaking and severe andcostly engine damage. Care must be taken if rotating the crankshaft orcamshafts with the belt off, if resistance is felt, do not force themto turn.

Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..

you have missed your timing marks you need to check your marks\