Got call today from a chap with a sick Mondeo. 1998 1.8 petrol.
Says he was doing 50 odd down a dual carriageway when there was a dull pop and it lost
power. Now won't rev above 2.5k. Had a quick look this evening in the dark. Nothing obvious.
Drove it and it sounds like the old "bogging down" we used to get on carbs.
First thoughts were a blocked fuel filter but surely that wouldn't happen so suddenly so collapsed cat maybe ?
Getting the car in tomorrow to investigate further.
Just thought I'd pass it by "The Gods Of All Knowledge" 
a rubber part of the air intake sucked off (oo-er) of a metal bit so the engine's getting more air than is going past the air flow meter, so affecting fuelling?
Mayeb you can find something here: http://www.btinternet.com/~madmole/Reference/Idle.html
If there was a pop its gotta be a pipe off. Id go as above pipe popped off or split between maf and engine.
Failing that cats gone.
is it a duratec?? There are some plastic baffles in the intake manifold that break up, could be one of them
I would suspect either inlet pipe adrift, jumped valve timing or a blocked cat converter.
is the lack of umph the result of the actual fault or is it just the ECU gone into limp home mode after picking fault up? worth a look fit the odvious external things first but if member of RAC ect could be worth a ECU fault code check before pulling things apart
quote:
Originally posted by will121
is the lack of umph the result of the actual fault or is it just the ECU gone into limp home mode after picking fault up? worth a look fit the odvious external things first but if member of RAC ect could be worth a ECU fault code check before pulling things apart
quote:
Originally posted by MK9R
is it a duratec?? There are some plastic baffles in the intake manifold that break up, could be one of them
I had this on a '98 mondeo. It was the cat that had collapsed. A local garage changed it out and checked the lambda sensor too.
Cheers,
Donny
Had exactly the same on my Mundaneo, but it's a Mk1 model, so can't say if they've sorted it - BUT there are two immediate suspects:
1. On mine, there's a small rubber elbow under the induction manifold, just down from the EGF valve. Mine had split, the cause of a rough idle
and an inability to rev. £5.00 from your Ford Stealer.
2. Later fault, the MAF sensor. Two little resistive wires in an alloy block. They fry themselves in a clean-up mode, eventually failing (as mine
did), suddenly. Engine wouldn't run cleanly, no power, nothing above a few K revs, no idle, seriously unhappy. If you pull the plug on the
earlier models, the ECU will use a default sensor voltage (fixed) and run beautifully, as mine did, while you find a new one. The later models
(apparently) come up with a fault code if you pull the plug.... as I don't have a later model, I don't know. I did eventually replace the
MAF, an Ebay part (£28 used), no problems.
Cat rattles like buggery so new one just arrived but far too cold to fit tonight.
i'm having a simlar problem with a 2.0 94 mondeo. i cant get it started. when its trying to start there is a loud poping noise as if its back firing. i sprayed easy start into it and it kind of went for a sec or two but still nothing. could it be the cat collapsed and blocked? and also that air temp sensor?