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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Idle issueViews : 817 Replies : 15Users Viewing This Thread : |
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Jul 29th, 2021, 20:39 | #11 |
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The battery was changed to a Lucas just as a precaution. I tested it but had no idea on its age.
The fuel pump and filter are now new and we are changing the MAF sensor tomorrow. |
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Jul 29th, 2021, 20:44 | #12 |
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Is the new Lucas battery a calcium one and was the old one a calcium one too?
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
Aug 11th, 2021, 21:27 | #13 |
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Problem starting, poor idle could it be the RSR?
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Aug 11th, 2021, 21:36 | #14 |
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If the RSR was playing up it wouldn't run. Stop looking in the wrong place, try the meths as previously advised, if that doesn't work then consider refitting your original MAF and AICV.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
Aug 12th, 2021, 10:03 | #15 |
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Location: Amersfoort (NL)
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Battery connections, TPS
As you have recently changed the battery, are you sure the battery terminal connections are correctly tightened again? Nothing else dislodged while taking out the battery.
Did you check functioning / setting of the throttle position switch? The ECU stops controlling the idle speed as soon as you press the throttle pedal and the TPS opens. If the TPS would open without you touching the pedal the engine speed would drop back to the basic setting of 500 rpm. I check my TPS by very slightly touching and immediately letting go of the throttle pedal. The engine idle speed then drops slightly to regain 800 rpm again within a second or so. Rob |
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Aug 12th, 2021, 17:10 | #16 |
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I'd be thinking more an air leak, or ignition problem. Get some plug lights and check it in the dark.
Spray WD40 around the injector seals in inlet gasket. Also check all the hoses connected to the manifold, rubber will be pretty old now if you haven't replaced it. Maybe check the injectors for leaking, pull off the manifold and prime the fuel system. |
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