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Seeking advice on rough start when cold issue

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Seeking advice on rough start when cold issue

Post by Odyssey113 » Wed Nov 08, 2017 11:25 am

So I recently brought back to life (after sitting for a year) my 2001 Volvo V70 2.4T model by replacing the first ignition coil in the firing order. Started right up, did basic maintenance to it, and have been driving it the past 3-4 weeks.

On cold mornings it seems to start pretty rough at first, sounding like some sort of misfire or hesitation is happening in the engine, then after maybe 30 seconds or so after warming up it runs fairly smooth.

Im trying to decide where to turn next to smooth out my rough start. I believe I am due for a mass air flow sensor replacement from what I've read about the P1171 code. My question is do you think I should first put my money into a new MAF sensor or throw money at buying 4 brand new ignition coils so i'll be running on 5 new coils? or could it be I need a stronger battery? Just looking for advice on this as money is tight right now but I want to ensure this baby keeps running for me thru the winter. Any advice is appreciated.

I will also point out that I am using new NGK iridium spark plugs. I have been recommended by another volvo guy to swap those over to bosch... I have not done that yet, but am considering that

Codes it was throwing when last checked:

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Re: Seeking advice on rough start when cold issue

Post by 93SCMax » Wed Nov 08, 2017 12:50 pm

If money is tight, I'd do the following, one at a time, to see if one solves your problem:
1) Replace spark plugs with genuine OEM. Bosch may be an equivalent, but I've had no issues in 16 years with "Volvo" on the plug.
2) Clean the MAF to see if there is an improvement, if not seek out a junkyard replacement. I bought one for $20 so they aren't too high. Check PN needed as S60, S80 and XC90 MAF's may be compatible.
3) Replace the battery if you know it's real old, not holding a charge or there are indications the CCA are up to snuff.
4) Replace the other 4 coils. This would be the most expensive way to go but would eliminate coils as a source of your misfire.
Good luck.
Last edited by 93SCMax on Fri Nov 10, 2017 5:10 am, edited 1 time in total.

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Re: Seeking advice on rough start when cold issue

Post by oragex » Wed Nov 08, 2017 4:07 pm

Don't throw money on ignition coils, when they go bad it will give missfire especially under hard acceleration.. You isssue is not easy to figure, you can test the battery/alternator and check the spark plugs, fuel filter, etc

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Re: Seeking advice on rough start when cold issue

Post by abscate » Thu Nov 09, 2017 9:59 am

30 seconds of lumpy idle on a high mileage car isnt necessarily indicative of any parts failure. My 99 does this, and then runs 27-29 mph at 30 mph smooth as silk. It may be internal wear on valve guides or valve train that seals up after a few seconds warmup

The P1171 code is a long term fuel trim and is often induction or vacuum leaks and not MAF related.
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