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Old 11-26-2017, 12:31 AM   #1
ALBASH
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Exclamation 1992 940 N/A High Idle

good morning guys i have a 940 that idles perfectly at 600 RPM but after hard driving and when i put the car on neutral it will idle around 1200 or 1400 then if i turn the car of and on it will idle normal at 600 plus i have fuel efficiency problem 220Km/50L
i replaced MAF and fuel injectors and fuel pump and filter cleaned throttle body and idle air control valve no luck so far and my mechanic i gave up on him he couldn't fix those problems and now with your help i want to try to fix it my self
sorry for the long post
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Old 11-26-2017, 01:10 AM   #2
Philippe Bellefleur
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.صباح الخير لك

Follow this procedure (1. Diagnostic Test Mode 1: Fault Code Retrieval)

https://www.volvoclub.org.uk/faq/Eng...agnosticCodesi

The "box" looks like that :


And it's here:
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Old 11-27-2017, 01:22 AM   #3
ALBASH
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thank you for the help i did it before there was no error but i will try it again and i will see the vacuum lines
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Old 11-27-2017, 01:43 AM   #4
ALBASH
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no i remembered it was crank sensor code and i replaced it
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Old 11-27-2017, 01:47 AM   #5
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Fuel pressure regulator?
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Old 11-27-2017, 05:22 AM   #6
Otto Mattik
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Quote:
Originally Posted by ALBASH View Post
good morning guys i have a 940 that idles perfectly at 600 RPM but after hard driving and when i put the car on neutral it will idle around 1200 or 1400 then if i turn the car of and on it will idle normal at 600 plus i have fuel efficiency problem 220Km/50L
i replaced MAF and fuel injectors and fuel pump and filter cleaned throttle body and idle air control valve no luck so far and my mechanic i gave up on him he couldn't fix those problems and now with your help i want to try to fix it my self
sorry for the long post
Have you checked carefully for vacuum leaks ?

When you say you replaced the IACV, do you mean with new OE ? Good used OE ?
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Old 11-27-2017, 03:02 PM   #7
ALBASH
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Quote:
Originally Posted by lummert View Post
Fuel pressure regulator?
not yet but i think its working fine but i will replace it
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Old 11-27-2017, 03:04 PM   #8
ALBASH
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Quote:
Originally Posted by Otto Mattik View Post
Have you checked carefully for vacuum leaks ?

When you say you replaced the IACV, do you mean with new OE ? Good used OE ?
good used one from perfectly working car i checked vacuum it was ok i will double check it for sure
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Old 11-27-2017, 04:39 PM   #9
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Is the TPS sensor working correctly?
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Old 12-04-2017, 03:48 AM   #10
ALBASH
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yea we checked the tps working perfectly
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Old 12-04-2017, 09:02 AM   #11
Otto Mattik
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throttle linkage ?

Last edited by Otto Mattik; 12-04-2017 at 09:15 AM..
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Old 12-07-2017, 05:06 AM   #12
ALBASH
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the problem i think with electronics something sending wrong signal i tried almost every thing but there is one thing ecu number and Ignition Control Module/Transistor if they dont match or something i need a solution out of the box and all your help appreciated thank you
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