None Rover - Ford OBD related.

OddSox · 1st December 2020, 17:20

Hi folks.

Been a while since i have been on here but i would like your help please.

Ford Fiesta MK6 2006. 1.25.

Had a miss fire...Sorted that after removing the ORIGINAL 14 year old spark plugs.!

Engine light was flashing before - then went to just being on, after putting new plugs in. (Engine runs fine now.)

My local mechanic plugged in his OBD and turned off the light.

All good and well but the light has now come back on again.

Iv'e checked everything that i can think of...Coil Pack, Various sensors etc...All seem okay.

I'm thinking of buying an OBD scanner to turn off the MIL...?

But what would cause it to keep coming back on?

Thanks fellas...

Synchromesh · 1st December 2020, 17:59

Many years ago my son's 2007 Focus 1.6 kept cutting out. He tried new plugs/leads but it was still cutting out. He fitted a new coil pack but it was still cutting out. I noticed that the three LT leads going into the coil pack were under tension and the way they were clipped resulted in fatigue where they entered the coil pack connector. With the engine running I pulled and pushed on the wires and the problem came and went as I did so. The fatigue had severed the copper strands in one or two of the LT wires but the plastic insulation was intact. I cut the connector off, opened it up and extended each of the wires by a few inches so I could form a strain relieving loop at the connector. The car was perfect after this repair and never gave any more trouble. I think the 1.6 Focus engine is a larger capacity version of the 1.25 Fiesta engine. I am not saying you have this problem but it is worth a quick look.

COLVERT · 1st December 2020, 18:03

I agree with the above post because there could be a problem with the 14 YEAR OLD LEADS TOO.---

It runs · 1st December 2020, 18:11

I have a fiesta 1.25 . For my driving school .

Missfire and light on .
If you haven't already checked .
Pull each lead off the coil . ( Engine switched off obviously)
Look inside the coil for corrosion . absolutely notorious .
New coil from local factors £25 cured.
Light went out by it's self after fitting.
Have a look anyway

trikey · 1st December 2020, 19:52

A learned friend tells me you should investigate the core plugs in the head, these can rot through letting water onto the leads and plugs.

I would have a look there first..

SCP440 · 1st December 2020, 20:02

Maybe the misfire has caused a problem with the Catalyst or a Lambda. Unburnt fuel can cause havoc to these sensors.

1st December 2020, 17:20	#1
OddSox Gets stuck in 2002. Rover 75 saloon club se. 1.8 vvc. Moonstone green. Join Date: Jul 2014 Location: Dunno...Sat nav broke..! Somewhere in Yorks. Posts: 988 Thanks: 296 Thanked 233 Times in 160 Posts	None Rover - Ford OBD related. Hi folks. Been a while since i have been on here but i would like your help please. Ford Fiesta MK6 2006. 1.25. Had a miss fire...Sorted that after removing the ORIGINAL 14 year old spark plugs.! Engine light was flashing before - then went to just being on, after putting new plugs in. (Engine runs fine now.) My local mechanic plugged in his OBD and turned off the light. All good and well but the light has now come back on again. Iv'e checked everything that i can think of...Coil Pack, Various sensors etc...All seem okay. I'm thinking of buying an OBD scanner to turn off the MIL...? But what would cause it to keep coming back on? Thanks fellas... __________________ Beware of spanner wielding 'Mechanics' who think they know what you mean better than you do.

1st December 2020, 18:11	#4
It runs Avid contributor Rover 75 saloon Join Date: Aug 2020 Location: Skelmersdale Posts: 181 Thanks: 15 Thanked 49 Times in 42 Posts	I have a fiesta 1.25 . For my driving school . Missfire and light on . If you haven't already checked . Pull each lead off the coil . ( Engine switched off obviously) Look inside the coil for corrosion . absolutely notorious . New coil from local factors £25 cured. Light went out by it's self after fitting. Have a look anyway __________________ Changed everything that needs changing and everything that didn't . It's called preventive maintenance.

1st December 2020, 19:52	#5
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,773 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	A learned friend tells me you should investigate the core plugs in the head, these can rot through letting water onto the leads and plugs. I would have a look there first.. __________________ Lest we forget..

1st December 2020, 17:59	#2
Synchromesh Gets stuck in Rover 75 Saloon Join Date: Jan 2010 Location: Preston Posts: 624 Thanks: 50 Thanked 44 Times in 32 Posts	Many years ago my son's 2007 Focus 1.6 kept cutting out. He tried new plugs/leads but it was still cutting out. He fitted a new coil pack but it was still cutting out. I noticed that the three LT leads going into the coil pack were under tension and the way they were clipped resulted in fatigue where they entered the coil pack connector. With the engine running I pulled and pushed on the wires and the problem came and went as I did so. The fatigue had severed the copper strands in one or two of the LT wires but the plastic insulation was intact. I cut the connector off, opened it up and extended each of the wires by a few inches so I could form a strain relieving loop at the connector. The car was perfect after this repair and never gave any more trouble. I think the 1.6 Focus engine is a larger capacity version of the 1.25 Fiesta engine. I am not saying you have this problem but it is worth a quick look.

1st December 2020, 18:03	#3
COLVERT This is my second home R75 Saloon. Join Date: Feb 2009 Location: France/or Devon. Posts: 14,003 Thanks: 3,851 Thanked 2,167 Times in 1,816 Posts	I agree with the above post because there could be a problem with the 14 YEAR OLD LEADS TOO.---

1st December 2020, 20:02	#6
SCP440 I really should get out more....... MG ZT-T 260 Join Date: Feb 2016 Location: Witney Posts: 2,504 Thanks: 6 Thanked 910 Times in 571 Posts	Maybe the misfire has caused a problem with the Catalyst or a Lambda. Unburnt fuel can cause havoc to these sensors.