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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Lambda light - on my Sport that had a misfire for yearsViews : 3144 Replies : 47Users Viewing This Thread : |
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Jun 14th, 2022, 09:50 | #1 |
Rogerthechorister
Last Online: Dec 16th, 2023 02:15
Join Date: May 2006
Location: Rochester
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Lambda light - on my Sport that had a misfire for years
Some of you may remember my VERY long thread about my first 940 Sport Edition - N plate, standard. She had a misfire that eluded many attempts to locate it until the FOURTH AMM I tried and she liked that.
On Saturday I started her to drive the nearly 100 miles to Harwich to visit family, and on came the lambda light, but she was driving fine. When I got there I pulled number 1 fuse and left that overnight. Started the following morning and much to my annoyance the light came back on after a few hundred yards. Pulled fuse over Sunday night and the light came back after a mile. Now here is the funny thing. The 100 (nearly) miles back, A120, A12, M25, A2 A289 A228 were mostly done at 70 mph apart from bits of road up on the A12 whch were 50 - and when I filled up I had done almost 39 MPG. I would have expected 25, maybe 27. So possibly I am running very lean although she is going very well - although slower than my other Sport and maybe a bit later for the turboplus to kick in. I used a bit of oil (well, she has 214k miles) but no water. So, the optimal diagnostic process... I have five (I think) AMMs in the garage but no air filters. Safi's garage 100 yards down the road has all the MoT gear to assess exhaust gases and lambda. And I have been thinking for some months it would be good to do plugs, plug leads, distributor cap rotor arm and filters and maybe coil - ie a full stage 0. So I think I will first ask Safi to do a pretend Mot just on gases and Lambda. If that shows the lambda to be correct then I can ignore the light until MoT time. Who knows if the lambda light being on but the lambda being correct is a fail or not? Second I think I will try all my AMMs to see if she likes any of them! If she does not, then the stage 0. If the stage 0 and the AMM do not cure the lambda light, and the lambda is actually out of spec, what else might it be? And what is the optimum route to fixing it. I do not really want to replace the ECU. I did build a flash tester a few years back, but have forgotten how to use it. Can somebody point me at the instructions and a list of codes?
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B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold. |
Jun 14th, 2022, 11:53 | #2 |
Premier Member
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Check the output of the Lambda sensor, chances are that's the problem especially if it's over 10 years/100k miles old.
Having the engine management light (Lambda) on at MoT is a fail regardless these days. As for the economy you got, doesn't surprise me at all.
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
Jun 14th, 2022, 13:47 | #3 |
VOC Member
Last Online: Today 01:54
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Location: Gloucester
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Isn’t the MOT rule about the engine management light only applicable to petrol cars first used after 1st July 2003 and diesels after 1st July 2008?
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Jun 14th, 2022, 14:20 | #4 |
Rogerthechorister
Last Online: Dec 16th, 2023 02:15
Join Date: May 2006
Location: Rochester
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Age of Lambda sensor
When she first developed the misfire (and simultaneously ate head gasket and clutch) I was still going out with my ex, Angelle and I have been with my new GF Ade since 2013 - and one of the things the then owner of the garage at the end of my road suspected and replaced (to no avail) was indeed the lambda sensor. So I should either get it tested or test it myself. Has anyone a link to show me how to test it?
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B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold. |
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Jun 14th, 2022, 14:22 | #5 |
Rogerthechorister
Last Online: Dec 16th, 2023 02:15
Join Date: May 2006
Location: Rochester
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Cheep cheep!
Since a genuine Bosch lambda sensor is only £53 I might as well slap one in!
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B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold. |
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Jun 14th, 2022, 14:26 | #6 | |
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Quote:
Section 8 ^^^^^ deals with testing the EML and you're right about the dates, however another section further up says if it is on at all then it's a major defect but doesn't give any year-specific information. Confusing or what!
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Jun 14th, 2022, 14:26 | #7 |
Rogerthechorister
Last Online: Dec 16th, 2023 02:15
Join Date: May 2006
Location: Rochester
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OTOH, maybe no need?
The "Honest John" website agrees that lambda light on is not of itself a fail if the gases and lambda are OK - https://www.honestjohn.co.uk/askhj/a...s-illuminated-
But MoT stations apparently cannot test lambda without using the MoT gear so I would have to pay for a full MoT! So says my garage.
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B234F estate, H reg 100k miles. RIP melted B280E. 760T estate, F reg 133k miles. 940 Sport M90 estate, N reg 170k miles. 940 Sport M90 estate, N reg 100k miles, ex Lovejoy. 960 Estate, N reg, 56k miles, blown up and sold. |
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Jun 14th, 2022, 14:54 | #8 | ||
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Quote:
Quote:
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Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
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Jun 15th, 2022, 08:40 | #9 |
Torquemeister
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PM sent with instructions on using my version of the code reader, which will at least give you a strarting point.
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loki_the_glt - Skipper of the Exxon Valdez, driver of Sweden's finest sporting saloon - and pining for another Slant-4. |
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Jun 15th, 2022, 09:21 | #10 | |
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Quote:
Could you send me the same pm ? I've had my code reader that long I've also forgotten Cheers, Mark
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960sport, flash reader, lambda, too many mpg! |
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