Question about 2003 Volvo S60

2 Answers

My 03 s60 2.3 T5 is hard to start after a long downtime. What could be the problem. It takes a lot of cranks b4 it starts. It seems like it is flooded. There are no dtc or MIL at this time and it's running perfect except for the hard starts. Can anybody help. Thanks

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  • igel513 May 25, 2010

    03 S60 Hard starting after long downtime. No DTCs or MIL this time. It takes long repeated crank times b4 it starts. Other than that prob. car is running fine w/ only 82K miles. Had fuel pressure tested and read 56 psi. What could be other solution to this prob?

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  • Volvo Master
  • 1,675 Answers

Hi this could be just the apposite of flooding, it could be lack of fuel, fuel starvation, although there could be numerous things to contribute to hard starting, i will name a few for you to check out, first start with the easy checks, plugs, what are they like is the spark good? you can test this by removing each plug in concession and turn the engine to see if it is a good strong blue-ish spark, next, leads and coil pack this may be reducing the spark for the plugs, you will find that out if you get a "slow" white spark from any of the plugs, next, fuel pump pressure, the only way you can get this checked is at a dealer or if you know someone with the measuring system for checking this, see if you are getting enough fuel and if they are opening at the correct time when the fuel is injected, next compression of bores, if you can get one, get the compression of each bore checked if there is allot of difference between each bore you may have valve or head problems and piston problems obviously this will be the worst scenario out of the many...hope this helps good luck

Posted on May 25, 2010

  • steve morris
    steve morris May 28, 2010

    obviusly you have checked all the above?

  • steve morris
    steve morris Jun 16, 2010

    you could always fit a non return valve if you are still having problems, as the other chap says, if its the valve inside of the pump try finding an in line non return valve that might do the trick

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  • Volvo Master
  • 76,132 Answers

Long crank times like this are most often caused by a defective fuel pump pressure check valve, also called a bleed back valve, when this valve fails in the electric fuel pump it lets the fuel lines and the fuel filer drain back into the tank, when the car is restarted the air must be purged from the system, they only way this can occurr is by the opening and the closing of the fuel injectors, this causes long cranking times and multiple stalls before engine runs smooth, many people think the engine is engine is flooding but that is not the case, the amount of fuel present to maintain ignition is insufficient and builds up in the cylinder, so when the engine does start many times you see smoke come out like it is flooded, the fuel pump. Have a shop hook up a special fuel pressure test gauge and do a fuel pressure leak-down test to verify the problem.

Posted on May 25, 2010

  • 3 more comments 
  • yadayada
    yadayada May 25, 2010

    checking the fuel pressure with the engine running is not going to show this problem, u have to hook up a gage and see if it drops after the engine is turned off, please read what i said it is a leak down test., if u still don't understand what i mean call me at home 925-45-0571 I have 35 years of Bosch fuel injection training and diagnosis, i am a master tech in this type of repair, I am familiar with this problem, have seen it dozens of times.

  • yadayada
    yadayada May 25, 2010

    correction, phone is 925-459-0571

  • igel513 May 26, 2010

    I will try the leak down test. I called the dealer and they said there is no such thing as fuel pump pressure check valve. I found fuel evaporation shut off valve online. Could this be similar to one u r referring to. I'll buy a nice fuel pressure gauge or better still, bring car to shop for diagnosis wc could cost an arm n a leg.

  • yadayada
    yadayada May 26, 2010

    the valve is built into the pump, who ever told u this had better go back to school, all Walboro type design in tank compact electric fuel pumps have a check valve at the pump outlet or pressure port, if they didn't the fuel will drain back into the tank from the entire fuel system and then u have to purge all that air out before you have a good start, the symptom once again is hard start long engine cranking times, often it is a series of starts sputters and stalls out. Please talk to another tech before u take who ever this is advising u about the check valve opinion. I have 35 years of repairing Bosch fuel injection, i a,m a master technician on the systems they have built, I DO KNOW WHAT I AM SAYING IS CORRECT. Thanks

  • igel513 May 29, 2010

    OK master, you made your point. Now, how do I access the fuel pump, how do I remove it, and which part should I replace.

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