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

rockheadrumble · Nov 22nd, 2013, 19:21

As i mentioned a while ago your car has the same symptoms mine had when it was running lean. power would drop off mid rev range when flooring it.

I had a adj fuel pressure reg and that was the problem, it was nakered and even at 8bar it was still lean!

If youve not done so id try a new fuel pressure reg and different injectors, they may be partially blocked. Im sure you will off checked this and iv not read every page of the thread but have you checked the vacuum tube from the fuel pressure reg to the inlet?

Another thought is that the injectors may not be fully home in the head, it is possible to fit the fuel rail with them not seated correctly. put some grease around the O ring and push them in.

Joe

Nov 22nd, 2013, 19:21	#106
rockheadrumble Senior Member Last Online: Sep 7th, 2020 21:54 Join Date: Jan 2011 Location: Kendal	As i mentioned a while ago your car has the same symptoms mine had when it was running lean. power would drop off mid rev range when flooring it. I had a adj fuel pressure reg and that was the problem, it was nakered and even at 8bar it was still lean! If youve not done so id try a new fuel pressure reg and different injectors, they may be partially blocked. Im sure you will off checked this and iv not read every page of the thread but have you checked the vacuum tube from the fuel pressure reg to the inlet? Another thought is that the injectors may not be fully home in the head, it is possible to fit the fuel rail with them not seated correctly. put some grease around the O ring and push them in. Joe __________________ HOLSET/new 3" exh+531 being installed(watch this space!) VXR 470cc injectors,960maf, 3" throttle,AEM AFR wideband, Forge MBC, Boost gauge, TTV Billet fly+850r clutch, Locker diff mod, Lowered 40mm,B4 bilsteins,Adj panhard rod,Cone filter.247400miles!