Svenska Posted March 27, 2009 Report Share Posted March 27, 2009 My neighbor's 1999 XC 70 has 155,000 miles on it and sometimes it gives a lengthy crank when starting it either hot or cold. Lengthy by maybe two/three-seconds than what it should, or longer than other times when there's no delay in starting it. The plugs are all new, and the battery is new. I thought I heard that with this engine B5254T, this is somewhat common. Am I right? Link to comment Share on other sites More sharing options...
1999_V70 Posted March 27, 2009 Report Share Posted March 27, 2009 Mine starts as soon as you turn the key, even when it's dead cold. Link to comment Share on other sites More sharing options...
Pauloil Posted March 27, 2009 Report Share Posted March 27, 2009 she could see if stopping at pos. II helps: this is where fuel pressure buildsit would be good to do a pressure leak down test: see how long pressure is held at the schrader valve after engine is shut off.any codes? how does engine run after it is started? Link to comment Share on other sites More sharing options...
PsychoWagon Posted March 27, 2009 Report Share Posted March 27, 2009 listen to pauloil. Sounds like a fuel regulator problem... or the pump leaking back. Link to comment Share on other sites More sharing options...
jb242gt Posted March 28, 2009 Report Share Posted March 28, 2009 listen to pauloil. Sounds like a fuel regulator problem... or the pump leaking back.Check the plugs & gap. My wifes '00XC had a slightly hard start. New plugs gapped at 28 solved the problem. Link to comment Share on other sites More sharing options...
MrWinkey Posted March 28, 2009 Report Share Posted March 28, 2009 she could see if stopping at pos. II helps: this is where fuel pressure buildsit would be good to do a pressure leak down test: see how long pressure is held at the schrader valve after engine is shut off.any codes? how does engine run after it is started?Agreed,,,,,check rail pressure for a drop and also any codes or MIL illumination? Link to comment Share on other sites More sharing options...
Svenska Posted March 28, 2009 Author Report Share Posted March 28, 2009 Thanks for the replies. The plugs are new (5,000 miles on them and are gapped properly), once it starts, it runs perfectly. I will check pressure at the rail - good idea, it mustn't be holding pressure well/long enough.Also no MIL or codes at all... Link to comment Share on other sites More sharing options...
Dan A Posted March 28, 2009 Report Share Posted March 28, 2009 Thanks for the replies. The plugs are new (5,000 miles on them and are gapped properly), once it starts, it runs perfectly. I will check pressure at the rail - good idea, it mustn't be holding pressure well/long enough.Also no MIL or codes at all...Fuel pressure regulator probably. Maybe CAM sensor, but that usually trips a code. Link to comment Share on other sites More sharing options...
Svenska Posted March 28, 2009 Author Report Share Posted March 28, 2009 I can't believe I didn't think of (at a minimum) testing the fuel pressure. The Volvo manual calls for 57 p.s.i. with the engine at idle (which this one is), then 20 minutes after shutting off the engine, the pressure can be no lower than 29 p.s.i. After 20 minutes, I had 31 p.s.i. It doesn't say anything about what it should be after one hour (it's down to 19 p.s.i.), but I guess that doesn't matter as long as it is measured at the 20 minute mark... This problem is intermittent, so I'm wondering if at certain times it does drop below 29 p.s.i. after 20 minutes... Link to comment Share on other sites More sharing options...
rbodor3 Posted March 29, 2009 Report Share Posted March 29, 2009 I'm having a similar problem with my 01 s60, but it ALWAYS takes a while to crank not just sometimes. I'm not really familiar with a fuel pressure check - how'd you do it? Link to comment Share on other sites More sharing options...
volvotool Posted March 31, 2009 Report Share Posted March 31, 2009 Check the fuel pressure, but I'd bet that it's the fuel pressure check valve in your fuel pump. Our '00 R wagon was doing the same thing - lengthy cranks to start - and we had an aftermarket auxiliary check-valve fitted right outside the fuel pump and that did the trick. The "correct" fix is to have the fuel pump replaced, but that's a BIG, expensive job on the AWD cars. I think the valve was about $50 and took 1/2 of shop labor to install. We've been driving like this for over a year with no issues. I got mine from JRL on Sweedspeed, but maybe someone on here knows a source, too. Link to comment Share on other sites More sharing options...
PsychoWagon Posted April 1, 2009 Report Share Posted April 1, 2009 19 psi after 1 hour = bad.should hold at 25 ish over 24 hours ( Yes, I've tested for some random problem cars)If it's at 19 after 1 hour, I bet you it goes to Zero after 24 0 psi = long crank Link to comment Share on other sites More sharing options...
Svenska Posted April 2, 2009 Author Report Share Posted April 2, 2009 Interesting. I wonder why the Volvo factory manual doesn't address that. It only gives parameters/data for what the pressure should be up to 20 minutes. Link to comment Share on other sites More sharing options...
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