Volvo Owners Club Forum - View Single Post - Bad running after new head gasket

rogerthechorister · Feb 2nd, 2017, 17:02

Max the mecco says he has tried blanking off the EGR pipe at the exhaust end and it made no difference. But it wouldn't if there was a break in the first pipe section or in the EGR valve itself, would it?

Tuesday she goes to Tim the other mecco to try blanking the EGR off completely.

The other funny thing is that Max has been talking to the people in Essex who drift Volvos and they say that there should be a steady voltage on pin 24 of the ECU (which if my memory serves me is the 5 degree retard pin) and we do not have that. I cannot now remember whether we have 12V or zero V (I think it's 12 but I'm not sure - and at about 3,000 or 3,500 rpm it goes to a wobbly 3.5 volts. That MIGHT be a cracked wire in the loom. I don't think it's the crank position sensor as I'm pretty sure we've changed that and if it was the sensor signal then the reve counter would go funny.

Some optimism, maybe!

Feb 2nd, 2017, 17:02	#362
rogerthechorister Rogerthechorister Last Online: Dec 16th, 2023 02:15 Join Date: May 2006 Location: Rochester	Another thought! Max the mecco says he has tried blanking off the EGR pipe at the exhaust end and it made no difference. But it wouldn't if there was a break in the first pipe section or in the EGR valve itself, would it? Tuesday she goes to Tim the other mecco to try blanking the EGR off completely. The other funny thing is that Max has been talking to the people in Essex who drift Volvos and they say that there should be a steady voltage on pin 24 of the ECU (which if my memory serves me is the 5 degree retard pin) and we do not have that. I cannot now remember whether we have 12V or zero V (I think it's 12 but I'm not sure - and at about 3,000 or 3,500 rpm it goes to a wobbly 3.5 volts. That MIGHT be a cracked wire in the loom. I don't think it's the crank position sensor as I'm pretty sure we've changed that and if it was the sensor signal then the reve counter would go funny. Some optimism, maybe! __________________ 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.