mondeo misfire

hiluxman

i have a 99 mk2 mondeo 1.6 petrol. it came in with a misfire so i put a coil pack, a set of leads and a set of plugs into it. i still seem to have a misfire but its only on acceleration at low revs, when you take off in first the engine nearly dies but is fine after the revs go over 2000rpm, when the car is stationery and you give it a quick rev it misfires badly and then revs up.
theres no fault codes stored and the values on the live readings look good, anyone have any ideas?

DublinDilbert

Have no idea about that model, but you might have an intermittant cam or crank pulse, might be worth looking on a scope as you rev the engine...

AzureAuto

Check for throttle body gunk/ sooty deposits and clean with carb cleaner.
Check timing of engine with pin and bar setting kit, timing may have jumped a tooth.

DannyBuoy

Oh that brings back some memories! That model mondeo misfired under acceleration at low revs for 1 of 2 reasons..
1. Spark jumping down the leads along the outside of the plug to earth, generally spotable by black marks along the plug ridges,
2. Valve bounce, either caused by wrong oil (and so hydraulic followers not operating properly) or carbon build up on the valves causing them to stick. Later valves had a ridge in them that resisted carbon build up.

Any chance it got an oil change recently??

If you've changed plugs and leads then def try oil and filter, and be certain to put in the correct oil.