2004 v70 Cold starting problem

eggleif · Post by **eggleif** » 09 Aug 2013, 08:17

Hi,
I'm a newbie here looking for a little advice.
I've recently had the camshaft oil seals replaced on my '04 V70, it's the 2.4 petrol, auto version. Since this job was completed the car is an absolute nightmare to start from cold. I may have to wait up to 30 seconds cranking it before it catches. Once running it's fine and once warmed up will start on the button. Drives fine and runs sweetly.
Obviously in replacing the oil seals, the cambelt etc were replaced but could this have anything to do with cold starting?
Any suggestions/help greatly appreciated.

jda2000 · Post by **jda2000** » 09 Aug 2013, 12:28

have the battery checked, if is the original then you need a new one.

eldorado98 · Post by **eldorado98** » 10 Aug 2013, 07:01

Got the same problem with my 02 C70. Had the camshaft position sensor (?) replaced which my mechanic said it was but that did no good. He now thinks it is in the ignition. Went online and consensus is an ignition problem. Right now my car is in getting a new convertible top. As soon as that's done I'll have my mechanic check out the ignition. I'll keep you posted. Please do the same.

Buckone · Post by **Buckone** » 05 Dec 2013, 09:26

I'm experiencing a similar problem starting my 2002 S60 AWD. I have to crank the engine for 5-30 seconds before it starts and then it runs fine. It throws a P0340 code (camshaft position sensor). The camshaft position sensor and wiring all check out. Replaced the sensor with a new one and same problem returned. The shop is now saying I need to replace the ECU. They are just guessing at this point. Has anyone else experienced this and solved their problem?

JimLev · Post by **JimLev** » 05 Dec 2013, 10:35

Have you checked out what the fuel pressure is?
It's possible the pressure is low when you first crank it and it takes a few seconds for the pump to build up the correct pressure.
Try turning the key on but not cranking it, then shut the key off and then back on. Do this a few times before you try to start it. If it starts right up I'd get the pressure checked. How old is the fuel filter?
If it runs fine after it is started I doubt it's the ECU.

Post by **jimmy57** » 05 Dec 2013, 13:29

The female terminals below ECM can give problems with age.
If the ECM is removed and terminals sprayed with WD-40 or similar and ECM is re-installed with no more problems then you have the answer.

Buckone · Post by **Buckone** » 05 Dec 2013, 20:53

Fuel pressure checked out fine. I went ahead and replaced the spark plugs, air filter, and fuel filter tonight. They all looked like they hadn't been done in a long time. It still didn't solve the problem. I've got to make a tool so I can get the ECU out.

JimLev · Post by **JimLev** » 05 Dec 2013, 21:01

Possible bad engine temp sensor? If it think the engine is warm when it's cold the ECU won't know it needs to inject more fuel which is required to start a cold engine.
How does it run and start when it's warmed up?

Post by **oragex** » 06 Dec 2013, 06:19

Inspect all hoses around the intake manifold and turbo for being properly secured. Make sure all electrical connectors close to the engine are properly secured. Inspect ignition coils electric wires for being crushed under the engine plastic cover. You can do all this by yourself.

In case the mechanic messed with the cams and hit a valve, have a compression test done and timing marks alignment checked.

Don't go replacing the ignition coils or ECU or fuel pump, that is typical suggestion of mechanics who don't know much. Go see a specific Volvo mechanic or the dealer for this issue. Be very careful if the dealer suggests replacing those parts as well. He is trying to make money.

Lastly, you will ruin the starter in the short term. Try cranking for less than 10 seconds, then wait 30 seconds to cool and try the same again. Don't crank for more than 10 seconds at a time, the starter is not built to do that, it will overheat and fail. You can try do give a slightly bit of gas while cranking (depress a little the gas pedal).

Buckone · Post by **Buckone** » 13 Dec 2013, 05:56

Here is a little more information and update on what I've found so far on my:
2002 Volvo S60 AWD. Engine L5 2.4L B5254T3

I’ve done some more work with hard starts and throwing the P0340 code (camshaft sensor).
I checked around the engine and ignition coils/wires look OK.
It has been at the dealership that did the following:
Fuel pressure test OK
Running pressure and residual pressures OK
VIDA and read codes ....P0340 (camshaft position sensor signal missing)
Connect breakout box to ECM and check signals/ground...CMP signal faulty
Wiring/connector/terminals check OK
CMP supply voltage 5V OK (is it ????)
Scoped signal with Vantage Pro
Replaced CMP sensor *******
Code returned so replaced original CMP sensor
Installed Cam timing tools and checked camshaft timing OK
Crankcase RPM sensor signal and wiring ...no fault
Disconnected starter cable and attach separate cable to eliminate interference...code returned.
Recommend replacing ECM and reload SW

I checked pins on the sensor and found:
With ignition off Pin 2 reads to ground. Pins 1 & 3 show nothing
With ignition on (position 2)
Pin 1 5V
Pin 2 ground
Pin 3 5V

Shouldn’t Pin 1 be ground and at least Pin 2 or 3 be 12 V?
I also found the continuity from Pin 1 to terminal A29, Pin 2 to A65, and Pin 3 to A27. Nothing seemed shorted out. With the ECM removed nothing is going to ground. Any thoughts out there? My next step is to replace the ECM. The ECM is a Bosch 0261207392 26SA0000 1111