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        General >> OBD Advice >> OBD Scan -HELP!
        
(Message started by: Snoopy on Aug 20^th, 2006, 3:08pm)

Title: OBD Scan -HELP!
Post by Snoopy on Aug 20^th, 2006, 3:08pm

I have just posted an OBD scan on the MSN website PLEASE can someone have a ganders please and see whats up ..!
Its for Simmo on this forum.

Simmo's scan (http://uk.msnusers.com/TheFordScorpio1995/Documents/SIMMO2.zip)

Title: Re: OBD Scan -HELP!
Post by scorpio_man on Aug 20^th, 2006, 5:55pm

hi there

just about to look at it! :)

Title: Re: OBD Scan -HELP!
Post by Simmo on Aug 20^th, 2006, 5:59pm

Thanks Snoopy, thanks Andrew.

Title: Re: OBD Scan -HELP!
Post by scorpio_man on Aug 20^th, 2006, 6:30pm

hi mike

are you having any problems? don't see much wrong on first glance. :-/

are you able to get a scan done like this.....
MAF
LTFT
REVS
LAMBDA SENSOR(S)

run it in idle for 5mins, giving it a rev to 2k rpm every minute (a/c off).

Title: Re: OBD Scan -HELP!
Post by Simmo on Aug 20^th, 2006, 7:35pm

Hi Andrew, That's our problem, No fault codes show up even when the idle revs 'die' almost to stalling point. Paul 'marked' the scan each time it did it but still no code!!. Will have to wait until we meet up again to get another one done. If I recall correctly Paul checked each of those items and no fault found. The strange thing is if I gently release the throttle from say 2500 revs it doesnt 'dip' to the 3/400 mark. If I just take my foot off and let it drop of its own accord it will drop to 3/400 and then immediately rise to 1000 ie 'normal'. We did have the air con off throughout the test. Thanks for your comments which I am sure Paul will see shortly and let you know if there is anything I haven't covered. No other issues with the car which still returns 27-28 on average with very few long runs. Best wishes. Mike.

Title: Re: OBD Scan -HELP!
Post by scorpio_man on Aug 20^th, 2006, 7:43pm

hi mike

the only thing i saw that was a bit odd was the spark advance. seemed to jump about a bit, but it's not something i've really scaned a lot of before. :-/

maybe check the wiring to the crankshaft sensor :-/

if i can think of anything else, i'll let you know.

btw, how's the sparkplugs? correct gap and nice and tight?

Title: Re: OBD Scan -HELP!
Post by Simmo on Aug 20^th, 2006, 7:48pm

Thanks Andrew, I'll check the items mentioned and report back tomorrow. Mike.

Title: Re: OBD Scan -HELP!
Post by Simmo on Aug 21^st, 2006, 4:59pm

Andrew, Have checked as you suggested. Found that the wiring to the coil packs was poor and so have replaced that and the section to the camshaft sensor. Took it right back to the injector 'joint'. All soldered and heat shrinked etc plus managed to dismantle and re-use the three connectors!. What a fiddle. Have taken some photos so will post when I get someone to show me how!!.The sad thing is it hasn't cured the fault.

Title: Re: OBD Scan -HELP!
Post by Pegasus on Aug 21^st, 2006, 9:53pm

Hi Mike,
PM'ed you re pix.

I've rechecked your scan through Excel and compared it with the 1 we did in March:

The LTFTs are in the negative, after running at high revs then dropping to idle as Andrew suggests the readings at idle (around 800prm)on the 1st scan were between -6.3 & -8.6%, on the recent scan the readings were around -6.3%.
A possible cause is my old friend - the fuel pressure regulator
What do you think, Andrew? (if it is, at least its easier to get at on your engine than mine)

I've looked at the Spark Advance - they always seem to jump about a bit, at least on the scans I've done.

Unfortunately, the spreadsheet hasn't recorded the points when the revs dropped low - I'm thinking it was the fact that we were simultaneously running "enhanced codes" so there appears to be big gaps in data converted to the CSV file. Next time, I wont run enhanced simultaneously. Anyone else noticed this?

Looking at the data I can't think of anything else but others will have more experience.

HTH

Paul

Title: Re: OBD Scan -HELP!
Post by Simmo on Aug 22^nd, 2006, 7:15am

Thanks Paul. As you will have seen I thought I may have found a cause but NO!.Mike

Title: Re: OBD Scan -HELP!
Post by scorpio_man on Aug 22^nd, 2006, 9:26pm

hi mike

it sound like the idle valve is faulty. does it do it as bad it the valve is disconnected?

what about under load (all electrics on)?

hth