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misfire on cold starts

Help, Advice, Owners' Discussion and DIY Tutorials devoted to the second generation C70, S40 and V50 Volvos -- awkwardly model year 2004 ½ onwards -- plus where to go for advice and discussion on Volvo's sporty C30 Coupe powered by Volvo's ubiquitous inline 5-cylinder power plant.
RickHaleParker
Posts: 663
Joined: Mon May 25, 2015 2:30 pm
Year and Model: 1998 C70 Coupe
Location: Kansas
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Re: misfire on cold starts

Post by RickHaleParker » Mon Aug 14, 2017 1:56 pm

RickHaleParker, did your clogged resonator show up as high backpressure or did you have a rattle?

We could hear it, the same loud whistle one gets with a clogged catalytic converter. I open the exhaust system between the catalytic converter and the resonator it went away, that told me it was not the catalytic converter, did the same between the resonator and muffler it did not go away, that isolated it to the resonator. One could start from the back and work forward, might save the cost of a clamp.

If you have a rattle, get under the car with a stethoscope, listen to the catalytic converter, resonator and muffler as somebody shakes the exhaust system. The internals of catalytic converters, resonators and mufflers sometimes break up causing back pressure and a rattle.


1997 S90, B6304S, AW30-42
1998 C70, B5234T3, AW50-42

mhamiton
Posts: 5
Joined: Thu Jul 13, 2017 6:54 am
Year and Model: 2006 C70
Location: Raleigh, NC
United States of America

Re: misfire on cold starts

Post by mhamiton » Tue Oct 03, 2017 6:48 am

I wanted to post back with an update. After several attempts at the local Volvo dealer resulted in them saying "we can't fix your car, good luck," it finally ended up at a competent dealer in Burlington, NC. Long story short, after 2 weeks (and a supposed "tech team" looking at the car) they diagnosed a bad fuel pump control module. That is on order and should be replaced this week.



RickHaleParker
Posts: 663
Joined: Mon May 25, 2015 2:30 pm
Year and Model: 1998 C70 Coupe
Location: Kansas
Has thanked: 1 time
Been thanked: 47 times
United States of America

Re: misfire on cold starts

Post by RickHaleParker » Fri Oct 06, 2017 7:03 pm

The Burlington, NC dealership is saying it was taking too long for the fuel pressure to build up ... it fits the symptoms.


1997 S90, B6304S, AW30-42
1998 C70, B5234T3, AW50-42

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