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S40 / V40 '96-'04 General Forum for the Volvo S40 and V40 (Classic) Series from 1995-2004. |
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Running really rough afterbreakdown.Views : 1353 Replies : 11Users Viewing This Thread : |
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Apr 20th, 2024, 19:16 | #1 |
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Last Online: Yesterday 12:43
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Location: Lincs.
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Running really rough afterbreakdown.
My V40 2.0 petrol broke down yesterday. It was going along great then suddenly the engine stalls and it refused to start. RAC man thought it was timing issue, It went to my (ex) usual garage and they didn't want to know so it ended upstuck on drive.
Today I stripped it down and check all timing makes and it is spot on. All four plugs firing but it runs really rough. It needs a lot of gas to keep it going for a few minutes then cuts out. Also cuts out if I try to drive it. There is no MIL light on the dash and my code reader shows no error. One strange thing though is once it cuts out after a short rough idle period no more than a minute the cooling fan comes on even though the rad is stone cold, it runs for a a minute or two then the fan goes off. Does anyone have any ideas on this problem.? Tomorrow I'm going to do a compression test. Any help much appreciated, as usual its happened at a bad time to be carless. |
Apr 20th, 2024, 19:46 | #2 |
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Location: Manchester
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it sounds like the engine temperature sensor has failed cheap and easy to replace
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Apr 20th, 2024, 20:10 | #3 |
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Last Online: Yesterday 12:43
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Location: Lincs.
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Apr 20th, 2024, 22:16 | #4 |
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Location: Manchester
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disconnecting wont do any thing as it needs to tell the ecu if its hot or cold to adjust the fuel accordingly
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Apr 20th, 2024, 22:34 | #5 | |
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Quote:
Fresh look at it tomorrow. |
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The Following User Says Thank You to cogs For This Useful Post: |
Apr 21st, 2024, 12:21 | #6 |
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Location: Lincs.
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Further developments with this problem.
I fitted a different fuel pressure regular later and a new engine temp sensor and still no go. I'm now wondering about the MAF sensor. Reason being when I unplug it and try to start it, it won't activate the MIL light and I think it usually does. though that is with the engine running which it now won't do either let alone run rough as before. I have plug in a code read, no codes showing, RAC man found a timing code on his system but wasn't to sure about it and I've checked the timing, all OK. Reading the live data with ignition only on and not running the MAF shows 0.00 and trying a start it still reads constant 0.00. But as said engine won't run so not sure what use these reading are. Another reading that seems out of place to me it the FuelSys1 it shows OL usually its CL. So not switching to a Closed loop and that would explain the over fuelling at the plugs I think. Both o2 sensors read 1.275 not running. I don't think I'd expect to see a difference between them until th`e engine is running. Any thoughts anyone? Last edited by cogs; Apr 21st, 2024 at 12:31. |
Apr 20th, 2024, 20:16 | #7 |
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Last Online: Yesterday 12:43
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Another thing I noticed was when I pulled the plugs out they had petrol on them. I was thinking perhaps a running rich problem, perhaps fuel regulator but then if the temp sensor is causing a problem I think it could be over fueling.
The RAC man squirted some brake cleaner in the air intake and it back fired on him. He jumped at that.first time I've witnessed a backfire for years. I thinking its an over fuel problem. But if the temperature sensor was causing it, my thinking is the ECU thinks the engine is hot, so switches on fan, but wouldn't the fuel be less if it thinks its hot as a cold engine needs more fuel until warm. If you see my thinking on that. Last edited by cogs; Apr 20th, 2024 at 20:48. |
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rough running. |
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