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Car Forum / Volvo Cars / December 2005Duty cycle for 84 240DL
Checked the duty cycle on my 84 wagon and reset it to 50% assuming that this is the optimum value, but it has seemed to have leaned the engine out some. Does anyone have the recommended value? I have a Haynes manual that does not mention a value, I have heard the Bentley manual may have the recommended setting. B23F engine. JD > Checked the duty cycle on my 84 wagon and reset it to 50% > assuming that this is the optimum value, but it has seemed [quoted text clipped - 3 lines] > the recommended setting. B23F engine. > JD I've heard conflicting numbers, what I ended up doing was measuring a well-running Kjet 240 and setting mine to match it, the adjustment is very sensitive though, best not messed with unless someone has already messed it up. I have the Volvo shop manuals for my '84...all 17 volumes of them. What engine do you have? More specifically, do you have a turbo with the fuel distributor in the right front corner of the engine bay or do you have the K-jet? You have to disconnect the oxygen sensor to set it properly. If the dwell reading is absoutely constant, there is a problem someplace. If you're still interested, I'll look it up but, the duty-cycle is supposed to fluctuate between something like 43 to 46. Those are not the actual figures, just off the top of my head. Once it's at the proper value, then reconnect the o2 sensor. > Checked the duty cycle on my 84 wagon and reset it to 50% > assuming that this is the optimum value, but it has seemed [quoted text clipped - 3 lines] > the recommended setting. B23F engine. > JD > I have the Volvo shop manuals for my '84...all 17 volumes of them. > What engine do you have? More specifically, do you have a turbo with [quoted text clipped - 5 lines] > Those are not the actual figures, just off the top of my head. Once it's > at the proper value, then reconnect the o2 sensor. He said right in the original post, B23F engine, that's a non-turbo 2.3 liter. > > I have the Volvo shop manuals for my '84...all 17 volumes of them. > > What engine do you have? More specifically, do you have a turbo with [quoted text clipped - 8 lines] > He said right in the original post, B23F engine, that's a non-turbo 2.3 > liter. OK. Then does it have a CI system or LH or whatever else Volvo used in '84? Bob  SignatureThe goal when driving is to miss the maximum number of objects. >>>I have the Volvo shop manuals for my '84...all 17 volumes of them. >>>What engine do you have? More specifically, do you have a turbo with [quoted text clipped - 13 lines] > > Bob It has CIS (K-jet), otherwise there'd be no duty cycle to adjust. >>>........................................................ >>>wrote: [quoted text clipped - 22 lines] > It has CIS (K-jet), otherwise there'd be no duty cycle to > adjust. What I mean by the duty cycle is the amount of times the O2 sensor goes from lean to rich. I have heard that this can be set with a led off the lead next to the coil but I must be doing something wrong. Manuals refer to the Volvo Monotester but I can't get a decent reading off my dwell meter. I have looked and have yet to find the definitive method of setting the O2 sensor frequency, duty cycle, CO level or whatever you would like to call this adjustment. It appears to be a necessity for achieving the proper fuel-air mixture. jd > >>>I have the Volvo shop manuals for my '84...all 17 volumes of them. > >>>What engine do you have? More specifically, do you have a turbo with [quoted text clipped - 15 lines] > > It has CIS (K-jet), otherwise there'd be no duty cycle to adjust. In 1984 Volvo referred to injector open time as dwell, prior to the current jargon of referring to pulse width modulation. Using the same test lead as the OP mentioned you could adjust the mixture, hence the injector dwell, just by reading the voltage sweep at the test point. Same procedure just different numbers. Bob SignatureThe goal when driving is to miss the maximum number of objects. Bob... I just love you guys that want to further complicate what the Volvo shop manual states VERY simply. Simply put...don't overcomplicate the obvious. >>>>>I have the Volvo shop manuals for my '84...all 17 volumes of them. >>>>>What engine do you have? More specifically, do you have a turbo with [quoted text clipped - 23 lines] > > Bob |
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