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Stutter at idle

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
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1990 - 1998 960
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fartoright
Posts: 4
Joined: Tue Jan 24, 2017 5:55 pm
Year and Model: 1989 245
Location: Orlando

Stutter at idle

Post by fartoright »

1989 245 dl. When I'm stopped at light with foot on brake the engine will stutter for a half second. The first time it did I thought someone hit my car. Started a month ago and would not happen often but now it happens about every 10 to 15 seconds while stopped. Does not happen while driving or accelerating only when stopped. Thank you for any advise.
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mydamnvolvo
Posts: 143
Joined: Tue Jan 12, 2016 1:51 pm
Year and Model: Lots
Location: New York

Re: Stutter at idle

Post by mydamnvolvo »

This happens on my 960. Fuel system cleaner helps, but it is probably a firing issue. Check spark plugs and try running fuel system cleaner and some good higher quality gasoline through it.
Current:
00 V70 (Daily)
01 V70 (Trips)
94 300zx (High School Present)
01 V70 (Hub)
08 GranCher (Daught)
01 740iL
09 C40 (Son)
Former:
93 BMW 525i-Daugh's-Seized
02 Chrysler T & C-Kid Hauler-Fire
72 Buick GSX-Dad's-Corroded
76 Golf GTI-Mom's-Died
97 960-1st-Timing
lummert
Posts: 1351
Joined: Tue Jan 29, 2008 5:39 pm
Year and Model: 760 1988
Location: Portland Indiana, USA
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Re: Stutter at idle

Post by lummert »

Brake booster?
1988 Volvo 760 Turbo Wagon
fartoright
Posts: 4
Joined: Tue Jan 24, 2017 5:55 pm
Year and Model: 1989 245
Location: Orlando

Re: Stutter at idle

Post by fartoright »

I have a short day at work tomorrow. I'm going to change spark plugs cuz I just replaced mass airflow sensor. Car was running ruff and fuel was rich. You mentioned brake booster? I assume you are referring to a vacuum leak. I will double check tomorrow. I checked before saw nothing abvious but I'm going to take a closer look. Where is the leak most likely to be?
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93Regina
Posts: 2813
Joined: Sat Jan 18, 2014 7:11 pm
Year and Model: 93:240/940
Location: Sunflower State
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Re: Stutter at idle

Post by 93Regina »

fartoright wrote:1989 245 dl. When I'm stopped at light with foot on brake the engine will stutter for a half second.
Brake booster's diaphragm and/or its check-valve may be the issue.
fartoright
Posts: 4
Joined: Tue Jan 24, 2017 5:55 pm
Year and Model: 1989 245
Location: Orlando

Re: Stutter at idle

Post by fartoright »

I changed the fuel pressure regulator. Spark plugs. And a used Bosch MAS. The car had a made in China MAS on it from previous owner. I increased the idle. It was idling way to low. She runs great now. I'm not sure what fixed it. The brake booster hose was fine. I took it off and inspected it. Thanks for all the advise.
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93Regina
Posts: 2813
Joined: Sat Jan 18, 2014 7:11 pm
Year and Model: 93:240/940
Location: Sunflower State
Been thanked: 64 times

Re: Stutter at idle

Post by 93Regina »

fartoright wrote:I increased the idle.
LH 2.4 idle adjustment FYI
fartoright
Posts: 4
Joined: Tue Jan 24, 2017 5:55 pm
Year and Model: 1989 245
Location: Orlando

Re: Stutter at idle

Post by fartoright »

Thanks for that info. I have a friend who has had 240 and 740 s for 35 years. He ran me thru how to do it correctly. His phone calls sounded a lot like your article.
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