Strange sensor 740 2.0 gl

Cipher · Mar 5th, 2007, 01:35

Hello,

Im new here and im from a village called ruthven which is near kirriemuir in scotland.

My dad has recently bought a Volvo 740Gl and its great, apart from a few teething problems that is.

Firstly a knocking sound coming from the front suspension when driving, we rekon its the front bushes, it is also causing outer wear on the passenger front tyre.

Now we are having a few problems with fuel consumption, my dad rekons its returning about 15-20mpg which seems to be a bit much. There seems to be a little button/sensor on the inlet that when pushed it takes the idle down from 1300rpm to about 900rpm, this looks like it should be pushed in when the throttle linkage hits it but it doesnt so we have got a bit of old fuel pipe and put it on the linkage and it now is, what i want to know it what this sensor does.

Apart from these few problems the car runs sweet as a nut and has alot of power, Im hoping to be doing my driving test in july with this car and hope to be buying it off my parents in the future for a project.

sheerwater · Mar 7th, 2007, 10:49

Just a guess. Is this the microswitch which is switched off when the throttle is closed. If so it is adjustable with 2 screw bolts on the side. Sends signal to ECU to advance retatd ignition etc.

Cipher · Mar 12th, 2007, 21:16

Sounds like thats it. would this effect the fuel economy?

sheerwater · Mar 13th, 2007, 09:19

Affects a lot...cant remember exactly what it controls but I think that it affects the ignition timing. From memory the switch has to be closed during ignition timing. You can check it the switch is working with a meter or simply by using a torch battery and bulb. Mt Haynes says that the switch should open just as the throttle opens. Often during basic services this is not checked and the throttle switch is open when the ignition timing is done. Adjustment..2 small screws...adjust so that a click is heard just as throttle is opened. Must affect fuel consumption if not adjusted properly as the ignition timing wont be correct. If you have the original handbook check the timing for your car...mine was 5 degrees yet all other models were 12. Even the dealer got it wrong!!!!

Mar 5th, 2007, 01:35	#1
Cipher New Member Last Online: Dec 13th, 2007 19:30 Join Date: Mar 2007 Location: Near kirriemuir	Strange sensor 740 2.0 gl Hello, Im new here and im from a village called ruthven which is near kirriemuir in scotland. My dad has recently bought a Volvo 740Gl and its great, apart from a few teething problems that is. Firstly a knocking sound coming from the front suspension when driving, we rekon its the front bushes, it is also causing outer wear on the passenger front tyre. Now we are having a few problems with fuel consumption, my dad rekons its returning about 15-20mpg which seems to be a bit much. There seems to be a little button/sensor on the inlet that when pushed it takes the idle down from 1300rpm to about 900rpm, this looks like it should be pushed in when the throttle linkage hits it but it doesnt so we have got a bit of old fuel pipe and put it on the linkage and it now is, what i want to know it what this sensor does. Apart from these few problems the car runs sweet as a nut and has alot of power, Im hoping to be doing my driving test in july with this car and hope to be buying it off my parents in the future for a project.

Mar 7th, 2007, 10:49	#2
sheerwater Master Member Last Online: Feb 24th, 2019 17:59 Join Date: Dec 2001 Location: Northampton	Just a guess. Is this the microswitch which is switched off when the throttle is closed. If so it is adjustable with 2 screw bolts on the side. Sends signal to ECU to advance retatd ignition etc.

Mar 12th, 2007, 21:16	#3
Cipher New Member Last Online: Dec 13th, 2007 19:30 Join Date: Mar 2007 Location: Near kirriemuir	Sounds like thats it. would this effect the fuel economy?

Mar 13th, 2007, 09:19	#4
sheerwater Master Member Last Online: Feb 24th, 2019 17:59 Join Date: Dec 2001 Location: Northampton	Affects a lot...cant remember exactly what it controls but I think that it affects the ignition timing. From memory the switch has to be closed during ignition timing. You can check it the switch is working with a meter or simply by using a torch battery and bulb. Mt Haynes says that the switch should open just as the throttle opens. Often during basic services this is not checked and the throttle switch is open when the ignition timing is done. Adjustment..2 small screws...adjust so that a click is heard just as throttle is opened. Must affect fuel consumption if not adjusted properly as the ignition timing wont be correct. If you have the original handbook check the timing for your car...mine was 5 degrees yet all other models were 12. Even the dealer got it wrong!!!!

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)