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'04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

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abscate
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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by abscate » Wed Jun 17, 2020 3:45 pm

I think they usually do. My PEM failure did not
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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by E Showell » Wed Jun 17, 2020 7:05 pm

Idle smoothes out the second I turn off the CEL.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by abscate » Wed Jun 17, 2020 7:08 pm

That’s with a reset of codes with Vida?

Is it idling ok with the MAF disconnected?
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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by E Showell » Thu Jun 18, 2020 3:10 am

Yes. VIDA "clear all" gives me an instantly smooth idle.

MAF. Is brand new. Haven't unplugged the new MAF.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)

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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by E Showell » Thu Jun 18, 2020 7:46 am

I'm finding VIDA worse than useless in these circumstances. It really isn't telling me anything.

And it is not at all apparent that you can get a fuel pressure reading out of it. Principal utility seems to be running the battery down.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)

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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by jimmy57 » Fri Jun 19, 2020 3:37 pm

OK. Whenever the idle speed is not controllable the ECM does random cylinder canceling to keep speed lower (prevents startling driver and runaway car allegations when throttle is punched instead of brake...). Lumpy idle and sometimes misfire codes from this FMEM. The air leak code is the ECM saying it can't drive throttle low enough to control idle speed satisfactorily. Look for air leak, hose, etc. Also need to inspect throttle to assure it is not gunked up or possibly something stuck in it. The throttle checks aren't easy but I get a feeling the idle overspeed control is your lumpy idle that goes away with a code clearing.
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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by E Showell » Fri Jun 19, 2020 3:55 pm

Throttle body replaced with used unit cleaned to hospital clean room conditions. FMEM?

Idle overspeed control?
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)

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Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by jonesg » Sat Jun 20, 2020 4:18 am

E Showell wrote:
Fri Jun 19, 2020 3:55 pm


Idle overspeed control?
A form of limp mode.
If signal from sensor on the foot pedal doesn't match the throttle body its a safety issue.

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E Showell
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E Showell

Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by E Showell » Mon Jun 22, 2020 11:04 am

Utterly defeated here. Alas, I have discover I am at best a paint-by-numbers-wrench, a/k/a mechanic wannabe. I'll do fine if I already know what the problem is, but, as a diagnostician, my wrenching skills leave much to be desired. Off to the local independent shortly.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)
'05 V70 T5 M (totalled)
'06 V70 FWD Auto (totalled)

User avatar
abscate
MVS Moderator
Posts: 21409
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 328 times
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Trinidad & Tobago
abscate

Re: '04 XC Engine Misfiring-Further Updated (Moisture ruled out - possible defective coils, bad MAF)

Post by abscate » Tue Jun 23, 2020 3:18 am

That’s a tough one. Don’t beat yourself up,you’ve got the logic brain m having seen first hand.

I’m guessing an intake air leak, brake booster, manifold, purge line, pcv, snorkel crack? Have you had the snorkel off?
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

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