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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 : 788 Replies : 15Users Viewing This Thread : |
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Jul 28th, 2021, 21:38 | #1 |
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Idle issue
Over recent months ive been gradually replacing serviceable items so I understand the car is at a minimum standard for reliability.
Ive changed rotor arm, distributor cover, plugs, leads, fuel filter, air filter, PCV, coolant, water pump etc. Yesterday i changed the battery, and its most likely a coincidence, but the engine tries to cut out when idling. It sits on 800 then dips suddenly only to regain its composure. I noticed it seems to be more prone to this when it has warmed up. This is my only car so is causing me concern. Any help appreciated as usual. |
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Jul 28th, 2021, 22:04 | #2 | |
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Jul 28th, 2021, 22:19 | #3 |
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92 940 with a B200F NA. I also cleaned the MAF sensor and air intake valve if it makes any difference as I previously had idle issue when coming to a junction. Turned out intake valve was filthy and i also changed PCV.
This feels more like a misfire, the engine was shaking on its mounts on idle when I returned from work. Last edited by m1santhrope; Jul 28th, 2021 at 22:33. |
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Jul 28th, 2021, 22:38 | #4 | |
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Also pull fuse #1 to clear any random data caused by changing the battery. What fuel (brand and grade) are you using?
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Jul 28th, 2021, 22:45 | #5 |
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Jul 28th, 2021, 23:12 | #6 | |
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Also i'd suggest changing to BP Ultimate (98RON) unleaded as well, you might not notice an immediate improvement but after a period of time you should.
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Jul 29th, 2021, 13:13 | #7 |
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MAF sensor or Lambda sensor?
I also have a 1992 940, B200F, NA which I bought in 2005.
Have you interrogated the OBD fault code reader? During it’s first year with me it developed a similar fault. The OBD fault code reader, position 2 (fuel) indicated Fault code 1:2:1 (MAF sensor signal faulty). I didn’t know much about that engine at that time and was advised to change the Lambda sensor, which I did ( a genuine Bosch one) and the problem disappeared. A couple of years later a similar problem arose eventually causing a complete “fail to run” on my way home from work necessitating a recovery to my home. The OBD again showed 1:2:1. I bit the bullet and ordered a new MAF sensor from my dealer. £250.00 after discount). This cured the problem.
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Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse. |
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Jul 29th, 2021, 14:13 | #8 |
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The one "problem" with that Ian is that if the fuel filter is blocked (as some symptoms are suggesting) it will also throw the MAF sensor fault which would be a red herring - and an expensive one!
Given the battery was changed it's highly possible there is rogue data floating about in the ECU memory, hence suggesting pulling fuse #1 to clear it. Also i forgot to ask - why was the battery changed?
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Jul 29th, 2021, 16:31 | #9 |
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I understood that the fuel filter had been changed.
Llambda sensor shouldn’t cost too much. He’s already spent quite a bit on replacement parts. If one could be found, substituting a known good MAF as an experiment may help, but sourcing one may be difficult.
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Ian. Since 2005: 1992 Volvo 940 estate 2.0L. Manual. Daily driver and workhorse. Last edited by Ian21401; Jul 29th, 2021 at 16:33. |
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Jul 29th, 2021, 17:46 | #10 | |
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However i'm wondering more as to why the battery was changed, what sort the new one is (if the old was calcium and so is the new one, that could be the problem) and whether the alternator is actually pumping out what it should. If not then those symptoms are not unusual.
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