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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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cycling idleViews : 1385 Replies : 2Users Viewing This Thread : |
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Jun 5th, 2002, 17:34 | #1 |
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Last Online: May 17th, 2024 09:12
Join Date: Dec 2001
Location: Lincolnshire
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cycling idle
i have an early 850 2.5 20v 1992, which uses the Bosch LH-3.2 system. i find the car has a tendancy to cycle its idle speed up and down by about 60 rpm, it also seems to misfire at about 2500 rpm to the extent you can hear a small break in the exhaust note every second or so. i also find the car quite thirsty, any ideas?
p.s. checked all the on board diagnostics no error codes found.
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Volvo 854 T5R Yellow 1994 Aquamist 2D (Don & Aquamist) BMC panel filter (Don) Ferrita Cat Back (Don) Denso Iridium Spark Plugs (Hong Kong) PowerFlex Top Engine Mount (?) PowerFlex Wishbone Bushes (Elk Parts) 302mm front brake upgrade Goodridge front hoses (rears to be fitted later) 600W Inverter (ebay) History: 1991 Volvo 340DL (1982) 1994 Volvo 360GLE (1989) 1999 Volvo 360GLT (1988) 2002 Volvo 850GLT (1991) 2004 Volvo 850T5R (1994) |
Jun 5th, 2002, 19:33 | #2 |
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Last Online: Feb 24th, 2019 17:59
Join Date: Dec 2001
Location: Northampton
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RE: cycling idle
A million and one things!!!!. Sounds however like a plug breaking down or one of the HT ignition leads deciding to pack up. If you have a multimeter its fairly easy to check the OHMS in the leads to see if they have any difference. Plugs are fairly cheap so.....! On idling check for leaks or tiny splits on the rubber air hoses and vacuum tubes. Worth taking off the constant idle valve and flushing it out in case there is crud there. Are the injectors clean and not playing a poor pattern. Hope this helps a bit. Cheers Nigel
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Jun 6th, 2002, 10:41 | #3 |
Master Member
Last Online: May 17th, 2024 09:12
Join Date: Dec 2001
Location: Lincolnshire
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RE: cycling idle
i connected a car foot pump to the fuel rail at the end where theres a valve i got about 35 psi at idle increasing to about 38 psi when i reved the enegine. i have also checked the inlet mainfold vacuum, at the little multipoint tree, and it goes from about 20.5hg down to 19.5hg following the idle speed cycles.
__________________
Volvo 854 T5R Yellow 1994 Aquamist 2D (Don & Aquamist) BMC panel filter (Don) Ferrita Cat Back (Don) Denso Iridium Spark Plugs (Hong Kong) PowerFlex Top Engine Mount (?) PowerFlex Wishbone Bushes (Elk Parts) 302mm front brake upgrade Goodridge front hoses (rears to be fitted later) 600W Inverter (ebay) History: 1991 Volvo 340DL (1982) 1994 Volvo 360GLE (1989) 1999 Volvo 360GLT (1988) 2002 Volvo 850GLT (1991) 2004 Volvo 850T5R (1994) |
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