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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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Intermittent hesitation when warm. No codes.Views : 1376 Replies : 8Users Viewing This Thread : |
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Apr 19th, 2018, 09:59 | #1 |
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Last Online: Jul 5th, 2018 09:02
Join Date: Jan 2018
Location: Saltburn by the sea
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Intermittent hesitation when warm. No codes.
Hello all.
Car has developed an intermittent fault where there will be a sudden loss of power for a split second that can make joining roundabouts pulling out from junctions a bit hairy when it occurs. If this was a sensor fault, cam, crank, throttle position, etc I would expect it to log a fault code but non logged. Again if it is a fuel pressure fault would this not also log a code ? The engine runs fine at all other times. The fault only seems to occur when engine up to temperature. Any ideas ? |
Apr 20th, 2018, 16:42 | #2 | |
Dave
Last Online: Sep 7th, 2023 11:33
Join Date: Apr 2016
Location: East Yorkshire
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Quote:
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V50 D5 'Thor' |
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Apr 21st, 2018, 09:06 | #3 |
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Last Online: Jul 5th, 2018 09:02
Join Date: Jan 2018
Location: Saltburn by the sea
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Puzzler
Thanks Yobbo. I have checked all hoses. If this were a petrol engine it is like the ignition has been turned off for a second and back on again. It is a very abrupt loss / return of engine power. I. e. no response at all from accelerator then normal response. What we used to call a " flat spot ". The fuel filter is new and the throttle body clean. The EGR has a blank fitted with a hole in centre. DPF has been replaced.
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Apr 22nd, 2018, 12:29 | #4 |
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Last Online: Aug 14th, 2018 12:35
Join Date: Jul 2013
Location: Teesside
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My car had this exact issue and it turned out to be a failing engine ECU.
While mine is the C30 D3 I believe the V50 ECU is in the same location and suffers the same issue. Water gets in the housing for the ECU and rots it. Luckily my car was under warranty so Volvo replaced the ECU and modified the housing to stop water collecting in it. Picture of ECU location on a V50 (same as C30 location) and two screenshots of the diagnostic video Volvo sent me showing the corrosion to my ECU and corrosion from the ECU in the plastic housing... Hope this helps. |
Apr 23rd, 2018, 09:15 | #5 |
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Last Online: Jul 5th, 2018 09:02
Join Date: Jan 2018
Location: Saltburn by the sea
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Thank you very much for that info I will check it out. Did yours also occur only when up to temperature ? That is why I suspect an electronic problem. Did yours also have no codes showing ?
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Apr 23rd, 2018, 11:11 | #6 |
Dave
Last Online: Sep 7th, 2023 11:33
Join Date: Apr 2016
Location: East Yorkshire
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In regards to the ECU, what baffles me is that there is an open hole directly above the damned thing which could allow rain water to get in, there are no drain holes beneath either!
Nonetheless I used some gaffer tape to block it off, next time I have the bumper off whenever that may be I might take the ECU off the car, give a dust down and apply some form of light sealant around the crevices on the ECU housing.
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V50 D5 'Thor' |
Apr 23rd, 2018, 13:47 | #7 | |
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Last Online: Aug 14th, 2018 12:35
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Location: Teesside
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Quote:
By the time the car went in to Volvo the ECU had dried out a bit due to some warmer weather and it hadn't done it for about 4 days. |
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