Problem Ford

dickdonk14

I have a 2003 petrol Mondeo. its misfiring while idling and driving. lack of power. today ive replaced spark plugs, air filter, sprayed decarb into throttle body and revd engine until no smoke from exhaust. let the car sit for a couple of hours then went for a spin. car ran fine for first mile then back to mifire, coughing and when idling cuts out. fuel injector sound like working properly any ideas guys before I set fire to the thing
thanks

fancy pigeon

Failing coil pack...?

shietpilot

Is the check engine light on?

biko

Split hose somewhere possibly.

defforirl

Start the engine and leave it running. Pull off the plug lead to number one cylinder, the one nearest the coolant tank. If the mis-firing gets worse replace the plug lead, if it stays the same then you know the problem lies with either no 1 plug lead or the coil pack. Do the same for all plug leads.

Sometimes if you run the engine at night in a dark area or in a garage with the lights turned off you can see the power arcing out of the plug lead to a metal bolt or bracket. If you can see this the plug leads need replacing.

dickdonk14

shietpilot wrote: »

Is the check engine light on?

engine light was on but went out later

dickdonk14

defforirl wrote: »

Start the engine and leave it running. Pull off the plug lead to number one cylinder, the one nearest the coolant tank. If the mis-firing gets worse replace the plug lead, if it stays the same then you know the problem lies with either no 1 plug lead or the coil pack. Do the same for all plug leads.

Sometimes if you run the engine at night in a dark area or in a garage with the lights turned off you can see the power arcing out of the plug lead to a metal bolt or bracket. If you can see this the plug leads need replacing.

I tried the leads
so leads 1 and 4 engine ran the same
led 2 engine ran worse
lead 3 engine ran better
and lead 4 gave me electric shock

shietpilot

dickdonk14 wrote: »

I tried the leads
so leads 1 and 4 engine ran the same
led 2 engine ran worse
lead 3 engine ran better
and lead 4 gave me electric shock

You took an ignition lead off and the engine ran better?

dickdonk14

shietpilot wrote: »

You took an ignition lead off and the engine ran better?

yes strange I know

biko

Possibly the leads aren't great, especially if one gave you a shock. If rubber is deteriorating moisture can get in and mess with the electricals.

dickdonk14

update changed ht leads, checked all hoses for leaks ( none ) cleaned throttle body and sensor. took to a friends who ran a compression test all fine. on way home put €20 petrol in and a splash of dipetane and car ran great for the day. went out in it today and misfiring and chugging upto 3000 rpm them runs fine. checked fuel filter any other ideas please

thanks

dickdonk14

will the wrong grade engine oil cause this problem

blackbox

dickdonk14 wrote: »

will the wrong grade engine oil cause this problem

Unlikely - unless it has done serious damage to engine. If this was the case it wouldn't have run well for a while after you replaced the leads.

.

irish bloke

Would you not scan it for the sake of €50 or so?
You could be at it until the cows come home otherwise

No on the oil grade either

kupus

defforirl wrote: »

Start the engine and leave it running. Pull off the plug lead to number one cylinder, the one nearest the coolant tank. If the mis-firing gets worse replace the plug lead, if it stays the same then you know the problem lies with either no 1 plug lead or the coil pack. Do the same for all plug leads.

Sometimes if you run the engine at night in a dark area or in a garage with the lights turned off you can see the power arcing out of the plug lead to a metal bolt or bracket. If you can see this the plug leads need replacing.

Thx for this deff I was scratching me head on another problem and completely forget about doing this.

dr.fuzzenstein

irish bloke wrote: »

Would you not scan it for the sake of €50 or so?
You could be at it until the cows come home otherwise

No on the oil grade either

€50? €5 bluetooth adapter from Ebay and Forscan App (free) on the phone.
Even diagnoses ABS faults.