|
700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
Information |
|
Misfire on idle B230FK 940Views : 1808 Replies : 31Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Jan 17th, 2018, 11:03 | #21 |
Senior Member
Last Online: Apr 19th, 2024 11:35
Join Date: Jun 2010
Location: East Mids
|
Update on this, I've flashed fault codes on engine and ignition ECUs - there were none.
I would quite like to try two ECUs to rule that out. I can chuck in some ATF, sounds good. I am planning to pull the head and maybe rebuild my spare head to go back on. |
The Following User Says Thank You to ie940 For This Useful Post: |
Jan 17th, 2018, 12:51 | #22 |
Master Member
Last Online: Today 14:00
Join Date: Feb 2006
Location: Amersfoort (NL)
|
Injector
I missed the bit about you having replaced the injector, but couldn't the problem be in the wiring to the no. 1 injector? Not sure if the leads are long enough, but as all injectors fire simultanuously, you could try swapping over the connectors of injectors one and two. How about the valve clearances on no. 1 cylinder?
I shouldn't expect any significant wear in a B230 engine after 225.000 km. Mine almost tripled that and is still idling and running fine. |
The Following 2 Users Say Thank You to Rversteeg For This Useful Post: |
Jan 17th, 2018, 13:32 | #23 |
Senior Member
Last Online: Apr 19th, 2024 11:35
Join Date: Jun 2010
Location: East Mids
|
My engine's on 150k.
I had indeed swapped an injector to a known good one and ohm tested them all. I have a suspicion it's injecting fine as it'll pop in the exhaust, but stop when you pull the injector wire off. Valve clearances are all good across the board, all within spec. |
The Following User Says Thank You to ie940 For This Useful Post: |
Jan 17th, 2018, 14:58 | #24 |
Premier Member
Last Online: Dec 28th, 2022 12:25
Join Date: Jun 2009
Location: Mercville
|
Strange how we all learn by what we have done and also what has happened to our own cars?
But what keeps my mind going back is the fact that the OP says the misfire at idle gets worse as it get warmer or hotter so therefore one should be able to rule out a burnt valve or even tappet /valve clearance. I had similar at one time years ago and all i remember was it was a Ford. The Kent Engine had oilways and waterways very near one another at the front (water pump end) of the head gasket......leading to the amount of gasket to the cylinder was limited and my engines HG had a very small blow in the shape of a straightish line which joined a waterway to the cylinder. When cold the misfire was damn nigh impossible to detect because of the choke on but upon warming up the coolant also got hotter and is pressurised by then and so caused a worse misfire? So maybe the start of a bad HG going West!
__________________
Mercedes C320CDI Sport Estate 3 litre V6 7 Gear Auto Remap 290bhp 628Nm torque @ 1600revs 45.1mpg |
The Following User Says Thank You to 960kg For This Useful Post: |
Jan 17th, 2018, 15:19 | #25 |
Master Member
Last Online: Today 14:00
Join Date: Feb 2006
Location: Amersfoort (NL)
|
Ecu
I don not see how the ECU could be at fault as it does not "know" which cylinder is firing. It simply puts an injection signal to all injectors simultanuously, independent of the crankshaft position. The ignition is also a common signal which is only led to a specific cylinder by the rotor in the dizzy cap. So there is no way a faulty ECU would only target cylinder no.1.
|
The Following 2 Users Say Thank You to Rversteeg For This Useful Post: |
Jan 17th, 2018, 15:22 | #26 | |
Premier Member
Last Online: Yesterday 23:44
Join Date: May 2012
Location: Lakenheath
|
Quote:
I had a Marina (1275cc) that did very similar to your Kent powered Ford, sadly what had caused the HG to fail in the first place was a partly blocked rad (which obviously got worse after the HGF) and that lead to the head resembling crazy paving there were that many cracks in it! Replaced the head and rad from a breakers (guaranteed bits) and unbeknown to me the rad was also blocked so the head cracked again. While waiting for them to source the bits under the guarantee, it wheezed its last on the A33 (pre-M3 link to Southampton) one morning on the way to work.
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
|
The Following User Says Thank You to Laird Scooby For This Useful Post: |
Jan 18th, 2018, 06:20 | #27 | |
Go redblock or go home
Last Online: Today 14:30
Join Date: Feb 2012
Location: UK
|
Quote:
|
|
The Following User Says Thank You to 360beast For This Useful Post: |
Jan 24th, 2018, 22:23 | #28 |
Senior Member
Last Online: Apr 19th, 2024 11:35
Join Date: Jun 2010
Location: East Mids
|
Fixed. Massive leak on inlet gasket cylinder 1. Some idiot had fitted the gasket so badly half was covering the port and half was hanging off the edge so letting air in. Worryingly been like that since I bought it two years ago.
|
The Following User Says Thank You to ie940 For This Useful Post: |
Jan 24th, 2018, 23:31 | #29 |
Premier Member
Last Online: Yesterday 23:44
Join Date: May 2012
Location: Lakenheath
|
Glad you found the problem, strange it's taken this long to show up as a problem though!
__________________
Cheers Dave Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........ |
Jan 25th, 2018, 11:26 | #30 | |
Master Member
Last Online: Jan 24th, 2022 17:08
Join Date: Nov 2008
Location: small village in the north of Germany
|
Quote:
Glue the new one on both sides. It should last 3-5 years. Best is to use phenolic spacers with glued gaskets on both sides. Regards, Kay |
|
The Following User Says Thank You to mocambique-amazone For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|