High Fuel Pressure? Leaky Injector? Or something else.

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R

Post Reply
JohnnyBee323
Posts: 28
Joined: Tue Mar 13, 2018 1:03 pm
Year and Model: 2004 S60 2.5 T FWD
Location: CT

Re: High Fuel Pressure? Leaky Injector? Or something else.

Post by JohnnyBee323 »

vtl wrote: Fri May 31, 2019 8:18 am Hard start ups can be caused by worn/stuck piston compression rings. Engine builds compression for longer than it should, thus it rejects to fire for a bit until the compression reaches its level. Try to soak rings overnight in Seafoam or similar fluids. I recall now I did this 2 or 3 times in the first years after I purchased the car. I helps to remove the passenger side wheel and turn the crankshaft +/- 15 degrees from time to time to agitate the rings. Don't forget to change oil afterwards.

Switching to a thicker quality oil will also help. I use Red Line 10w40 for a few years, very happy with it. It does not turn to sludge, does not lacquer the inner surfaces and washes the engine.
Well I do notice that I have some crankcase pressure. When the engine is running, and the oil cap is off, smoke/pressure will eminate instead of there being a vacuum. However, I done the glove test at idle, and not while revving the engine. So a piston ring may be wearing down.

Keep in mind, I am not a mechanic, anything too complex I would bring it to a shop for. But how would I have the piston rings soak in seafoam overnight?

User avatar
vtl
Posts: 2097
Joined: Thu Aug 16, 2012 1:35 pm
Year and Model: 2005 XC70
Location: Boston
Has thanked: 4 times
Been thanked: 98 times

Post by vtl »

JohnnyBee323 wrote: Fri May 31, 2019 10:32 am But how would I have the piston rings soak in seafoam overnight?
Remove spark plugs, level the pistons more or less equally (just check that none of the them are in a top dead centre), pour Seafoam inside the cylinders so that the liquid is covering the pistons completely. Keep adding Seafom to the cylinders that leak it to the crankcase, agitate the crankshaft +/-15 degrees from time to time. In the morning suck or blow out the remaining Seafoam out (if anything left) and replace the oil. Using a thicker grade would be wise, since not all of Seafom will leave the engine and it will dilute your fresh oil.
05 XC70, 16 XC60, 19 Tundra

JohnnyBee323
Posts: 28
Joined: Tue Mar 13, 2018 1:03 pm
Year and Model: 2004 S60 2.5 T FWD
Location: CT

Post by JohnnyBee323 »

vtl wrote: Fri May 31, 2019 11:39 am
JohnnyBee323 wrote: Fri May 31, 2019 10:32 am But how would I have the piston rings soak in seafoam overnight?
Remove spark plugs, level the pistons more or less equally (just check that none of the them are in a top dead centre), pour Seafoam inside the cylinders so that the liquid is covering the pistons completely. Keep adding Seafom to the cylinders that leak it to the crankcase, agitate the crankshaft +/-15 degrees from time to time. In the morning suck or blow out the remaining Seafoam out (if anything left) and replace the oil. Using a thicker grade would be wise, since not all of Seafom will leave the engine and it will dilute your fresh oil.
I spoke too soon. After driving for about 15 minutes on the highway, parked car at friends house for 30 minutes in the sun. Went to start it again when leaving, it started back surging as I was reversing out of the driveway, and code came back on shortly thereafter. It seems to surge more on hot days for some reason. Anyway, I cleared the code again and it seems to be running fine now. Could high crankcase pressure be the culprit somehow?

See attached images right before I cleared the code.
Attachments
4D0FA60C-F309-424D-A286-693FB3C63E61.jpeg
C2BBBFFB-6244-4839-A31B-BBBC6B15411E.jpeg
5381CC7A-C74F-4E46-8B61-CDF795BF2259.jpeg
2224435B-4F64-4C24-9296-8D8CF95C32A5.jpeg

User avatar
abscate  
MVS Moderator
Posts: 24070
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 457 times
Been thanked: 1360 times

Post by abscate »

Did you get real fuel pressures measurements on the rail? If that isn’t nailed to spec, it’s fuel delivery problem.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
vtl
Posts: 2097
Joined: Thu Aug 16, 2012 1:35 pm
Year and Model: 2005 XC70
Location: Boston
Has thanked: 4 times
Been thanked: 98 times

Post by vtl »

What is LOAD_PCT? And ECT?
05 XC70, 16 XC60, 19 Tundra

Post Reply
  • Similar Topics
    Replies
    Views
    Last post