Seeking info on whether the volvo 850 ambient air temp sensor is networked in any way with regulating fuel delivery on warmup. I also have a ECC control panel not working, so I'm curious if that sensor (below front bumper) might have role in that.
The main issue: My 93 850 GLT has an ECC code 122 and issue with easy start in any weather, but during warmup engine starves for fuel and quits. After half hour or so, restarts and runs fine for rest of day including engine off and cooled down, and restart multiple times, no problem.
It's just on that first startup on a new day. Puzzling.
Insights appreciated!
volvo 850 "ambient air temp sensor" questions
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jmartin919
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Maybe coolant temp sensor
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scot850
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As suggested the ECT - coolant temp sensor has a big affect on the start up an running of the car. I am trying to recall if there are 2 ambient temp sensors on the 850's. Do you have an external temp readout in the car?
The external sensor does have an effect on the reading if you have 2. I know on my 2000 V70R there are 2 sensors, on for ambient outside temp for the cabin readout and a 2nd for the engine ECU.
I believe there is a sensor on the back of the front bumper on the LHS. Disconnect that and see if it makes any difference and if you have an internal readout of external temp, if that goes off.
Neil.
The external sensor does have an effect on the reading if you have 2. I know on my 2000 V70R there are 2 sensors, on for ambient outside temp for the cabin readout and a 2nd for the engine ECU.
I believe there is a sensor on the back of the front bumper on the LHS. Disconnect that and see if it makes any difference and if you have an internal readout of external temp, if that goes off.
Neil.
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2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
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JimBee
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I'm pretty sure the 850's only have the one external (ambient) temp sensor. I'll try disconnecting it to see if it changes the dash readout or the stalling condition. There is a red dot by the dash readout to indicate below freezing. That might be activated by the external sensor. Is that it's only role? Checking around online I didn't turn up diagnostic detail.
It makes sense that a faulty ECT could cause a start-stall then start and run normally condition.
It makes sense that a faulty ECT could cause a start-stall then start and run normally condition.
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BlackBart
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I think that bumper sensor is just for the dash display. I would think the intake system sensors and ECT would govern computer changes to mixture and idle air.
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JimBee
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A further google search turned up this page:
https://www.carparts.com/blog/whats-the ... ment-cost/
This makes sense, when you consider the sophistication of the automatic climate control mode, that would regulate cabin temp—heating or cooling—taking into account the exterior temp.
The key word in that link, assuming it's accurate, is the HVAC "automatic" setting. My 93 850 doesn't have cooling so I've never used the automatic setting.
It makes sense that the ECC would be distinct from the engine cooling and fuel regulation system, so I guess I won't worry about the ambient temp sensor causing any disruption there. There is a problem with the heater controls, though, which I've ignored while driving my MCC 96 850. I'll continue to try to solve that, looking more at the resistor and fan system for clues.
What would life be without problems to solve?
https://www.carparts.com/blog/whats-the ... ment-cost/
This makes sense, when you consider the sophistication of the automatic climate control mode, that would regulate cabin temp—heating or cooling—taking into account the exterior temp.
The key word in that link, assuming it's accurate, is the HVAC "automatic" setting. My 93 850 doesn't have cooling so I've never used the automatic setting.
It makes sense that the ECC would be distinct from the engine cooling and fuel regulation system, so I guess I won't worry about the ambient temp sensor causing any disruption there. There is a problem with the heater controls, though, which I've ignored while driving my MCC 96 850. I'll continue to try to solve that, looking more at the resistor and fan system for clues.
What would life be without problems to solve?
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