Intermittent idle issue, SVT JRSC BBK - The Ford Focus Forum

**CaysE** · 11-03-2009, 01:59 PM

I'd say about 50% of the time when I come to a stop in neutral, the idle will be normal, and after 15-20 seconds or so, the AFR will start leaning out and vacuum drops from ~20in to ~10in. The idle gets really low and rough and it tries to die a few times, and after 5-10 seconds the AFR will quickly richen to around 12:1 and everything is back to normal. Then AFR will even out normally to between 14 and 15. Vacuum goes back to normal, as well.

Does this sound like a vacuum issue, or something to do with the tune? I haven't contacted McNews yet; I figured I'd post here first just to see if it might be an easy fix.

**CaysE** · 11-04-2009, 11:10 AM

Don't tell me I've stumped the FI forum?

**hEaT** · 11-04-2009, 11:54 AM

Sounds tune related, possibly with the dashpot.

What throttle body is on there? IAC is good working order?

Quote:

Originally Posted by CaysE

Don't tell me I've stumped the FI forum?

Nah, we just don't like you

**CaysE** · 11-04-2009, 12:44 PM

CFM 67mm TB and the IACV is new. Im thinking tune as well, but the dropped vacuum just had me wondering.

**Ja-Red** · 11-04-2009, 12:49 PM

It is something in the tune. Mine does the same thing. It is a timing issue, my timing drops to like 10-12 deg but I cant figure out why.

**Stolle** · 11-04-2009, 01:09 PM

same here. my JRSC does the same thing. its annoying. but i live with it...

ive heard if u feed it more timing at idle it could help soothe that rough idle...

**98gsxltd** · 11-05-2009, 03:37 PM

that also happened on my car when i had the jrsc, i only had problems when the weather was cooler, i just had the tune adjusted (mcnews tuned my car) and it worked, id call your tuner.

**Stolle** · 11-06-2009, 09:57 AM

Quote:

Originally Posted by 98gsxltd

that also happened on my car when i had the jrsc, i only had problems when the weather was cooler, i just had the tune adjusted (mcnews tuned my car) and it worked, id call your tuner.

yea! id say so...that little slutty JRSC kit HATES the cold....as soon it would get dark when i was home on leave from afghan it was a horrible car to daily...but during the warm days it just purred at stoplights...

**CaysE** · 11-06-2009, 10:08 AM

It seems to be completely random on my car... it was pretty cold this morning and it only did it once, but the idle wasn't nearly as rough as before. I'll give Ray a call.

**Stolle** · 11-06-2009, 10:23 AM

only thing u could really do. if u know how. forgot if u do or dont. go datalog the car while just putzing around and try to catch it in the act of sputtering and going crazy AFR.s and show it to ray and he should be able to see exactly what the cars doing/trying to do...

**CaysE** · 11-06-2009, 10:39 AM

I'm going to give that a shot on my way home from work.

**Danny_C** · 11-07-2009, 11:29 AM

very similar to my jrsc zetec, please post the cause of your problem when you find out

11-03-2009, 01:59 PM	#1 (permalink)
CaysE EDM Specialist Join Date: Dec 2004 Location: Bloomfield, NJ Posts: 10,765	Intermittent idle issue, SVT JRSC BBK I'd say about 50% of the time when I come to a stop in neutral, the idle will be normal, and after 15-20 seconds or so, the AFR will start leaning out and vacuum drops from ~20in to ~10in. The idle gets really low and rough and it tries to die a few times, and after 5-10 seconds the AFR will quickly richen to around 12:1 and everything is back to normal. Then AFR will even out normally to between 14 and 15. Vacuum goes back to normal, as well. Does this sound like a vacuum issue, or something to do with the tune? I haven't contacted McNews yet; I figured I'd post here first just to see if it might be an easy fix. __________________ 2002 Liquid Grey ZX3 ··· SVT replica-in-progress 2003 Vermilion Red SVTf ··· ported JRSC BBK, ported head, 3" exhaust, Euro interior, more to come! strictly/focused • team edm

11-04-2009, 11:10 AM	#2 (permalink)
CaysE EDM Specialist Join Date: Dec 2004 Location: Bloomfield, NJ Posts: 10,765	Re: Intermittent idle issue, SVT JRSC BBK Don't tell me I've stumped the FI forum? __________________ 2002 Liquid Grey ZX3 ··· SVT replica-in-progress 2003 Vermilion Red SVTf ··· ported JRSC BBK, ported head, 3" exhaust, Euro interior, more to come! strictly/focused • team edm

11-04-2009, 12:44 PM	#4 (permalink)
CaysE EDM Specialist Join Date: Dec 2004 Location: Bloomfield, NJ Posts: 10,765	Re: Intermittent idle issue, SVT JRSC BBK CFM 67mm TB and the IACV is new. Im thinking tune as well, but the dropped vacuum just had me wondering. __________________ 2002 Liquid Grey ZX3 ··· SVT replica-in-progress 2003 Vermilion Red SVTf ··· ported JRSC BBK, ported head, 3" exhaust, Euro interior, more to come! strictly/focused • team edm

11-04-2009, 01:09 PM	#6 (permalink)
Stolle Join Date: Aug 2006 Location: Drafted (Stop Lossed) in the US Army Posts: 3,273	Re: Intermittent idle issue, SVT JRSC BBK same here. my JRSC does the same thing. its annoying. but i live with it... ive heard if u feed it more timing at idle it could help soothe that rough idle... __________________ Andy. {262 Crew!} West Bend Wisconsin at Heart. Always. 262 CREW! Deployed to Afghanistan 2009 OEF 09 & 10. Stop Lossed. ='( "Despite Secretary Gates's order, by April 2008 use of stop-loss had increased by 43%" "Never in my life have I seen a focus pull like that before!" - STI Owner Stollen\|Werks! "I couldn't repair your brakes,so I made your horn louder"

11-05-2009, 03:37 PM	#7 (permalink)
98gsxltd TEAM Member Join Date: Jul 2005 Location: Winona, MN Posts: 580	Re: Intermittent idle issue, SVT JRSC BBK that also happened on my car when i had the jrsc, i only had problems when the weather was cooler, i just had the tune adjusted (mcnews tuned my car) and it worked, id call your tuner. __________________ 2001 Focus ZX3 totaled 2003 Explorer Sport: Yakima Fat Cat, Alpine HU

11-06-2009, 10:08 AM	#9 (permalink)
CaysE EDM Specialist Join Date: Dec 2004 Location: Bloomfield, NJ Posts: 10,765	Re: Intermittent idle issue, SVT JRSC BBK It seems to be completely random on my car... it was pretty cold this morning and it only did it once, but the idle wasn't nearly as rough as before. I'll give Ray a call. __________________ 2002 Liquid Grey ZX3 ··· SVT replica-in-progress 2003 Vermilion Red SVTf ··· ported JRSC BBK, ported head, 3" exhaust, Euro interior, more to come! strictly/focused • team edm

11-06-2009, 10:23 AM	#10 (permalink)
Stolle Join Date: Aug 2006 Location: Drafted (Stop Lossed) in the US Army Posts: 3,273	Re: Intermittent idle issue, SVT JRSC BBK only thing u could really do. if u know how. forgot if u do or dont. go datalog the car while just putzing around and try to catch it in the act of sputtering and going crazy AFR.s and show it to ray and he should be able to see exactly what the cars doing/trying to do... __________________ Andy. {262 Crew!} West Bend Wisconsin at Heart. Always. 262 CREW! Deployed to Afghanistan 2009 OEF 09 & 10. Stop Lossed. ='( "Despite Secretary Gates's order, by April 2008 use of stop-loss had increased by 43%" "Never in my life have I seen a focus pull like that before!" - STI Owner Stollen\|Werks! "I couldn't repair your brakes,so I made your horn louder"

11-06-2009, 10:39 AM	#11 (permalink)
CaysE EDM Specialist Join Date: Dec 2004 Location: Bloomfield, NJ Posts: 10,765	Re: Intermittent idle issue, SVT JRSC BBK I'm going to give that a shot on my way home from work. __________________ 2002 Liquid Grey ZX3 ··· SVT replica-in-progress 2003 Vermilion Red SVTf ··· ported JRSC BBK, ported head, 3" exhaust, Euro interior, more to come! strictly/focused • team edm

11-07-2009, 11:29 AM	#12 (permalink)
Danny_C TEAM Member Join Date: Apr 2006 Location: UK Posts: 434	Re: Intermittent idle issue, SVT JRSC BBK very similar to my jrsc zetec, please post the cause of your problem when you find out __________________ JRSC BBK 2ltr zetec Mondeo 203 bhp 178 lbft

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