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Cold start issue 2004 s40 1.9L T5

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40

FunkadelicxS40
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Cold start issue 2004 s40 1.9L T5

Post by FunkadelicxS40 » Thu Dec 19, 2019 1:16 pm

The end of October I started to get a cold start issue which won’t let my car idle unless I held the throttle long enough for the car to warm up a bit. I did some research and thought it may be the ect or oxygen sensor so I went ahead and replaced the ect sensor as well as thermostat and then the o2 sensor. After replacing the o2 sensor I had some temporary success starting the car cold. It would sometimes sound the like battery power dies out for a split second in between cranking it and it turning over. Eventually the idle issue returned and I had a code for transmission side and took it to the mechanic. They replaced the gear position switch and charged my battery since it was about 60% full and that was the only issue they could see related to the cold start. After further research I believe what I’m experiencing is a vacuum leak since the car can not get the proper air fuel mix at idle and once it’s warm on the highway has some performance issues and a bit of a high idle over 70mph. I’ve seen people locate the leak with propane or carb cleaner, but I am wondering if butane will work as well or any other ideas that may be more safe. I’m planning a trip for Xmas and would like to drive 400 miles and have my brother who’s an ex Volvo mechanic look at it. Would that be I’ll advised before finding the leak? I haven’t driven the car for more than an hour sense experiencing this issue as I mainly use it to commute to work and back. Any advise welcome thanks!

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alschnertz
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Re: Cold start issue 2004 s40 1.9L T5

Post by alschnertz » Thu Dec 19, 2019 6:32 pm

I would guess you have an issue with the Idle Air Control Valve.

"a bit of a high idle over 70mph"
No idea what you mean.

Also, you reference a "1.9L T5".
1.9L is a 4-cylinder engine.
T5 is a 5-cylinder engine.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

FunkadelicxS40
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Re: Cold start issue 2004 s40 1.9L T5

Post by FunkadelicxS40 » Thu Dec 19, 2019 6:44 pm

It used to show 2.5k rpms at 75mph now it’s close to 3k. Pretty sure the car is a 5 speed 4 cylinder turbo. I will check for the idle air control valve thanks!

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alschnertz
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Re: Cold start issue 2004 s40 1.9L T5

Post by alschnertz » Thu Dec 19, 2019 11:24 pm

Ok, you were talking about the transmission.
Yes, a 2004 would be a 5-speed automatic transmission in a North American delivered car.
However, "T5" is a term Volvo used when referring to certain turbocharged 5-cylinder models.

Edit: In addition to checking for vacuum leaks, it may be worth cleaning both the Idle Air Control valve and the Throttle Body.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
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boosteds40
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Re: Cold start issue 2004 s40 1.9L T5

Post by boosteds40 » Wed Dec 25, 2019 4:11 pm

I have had the same issue since 2017. My mom drove my car when I was out of town. There was a big oil leak, she kept driving it ☠️. I came back to a knocking volvo. Drove the car with rod knock until oct. 2018 as I had a cold start problem. I have to hold my foot on the throttle and keep it up to about 1500k rpm until it switched to closed loop and then it ran fine. I got sick of the rod knock so I took that motor put over a span of 9 months because I wasn't in a hurry, and summer comes around. I buy a healthy motor with 96k on it put it in and the car works beautifully no issues; however, October rolls around and the dreaded choppy idle until its warm shows up. I have a feeling it is not engine related, rather computer, wiring to sensor related messing with the AFR upon cold start up. I also have had a P0171, and have replaced everything I could related to vacuum, lines, pumps, to the whole fuel system, except the pump. I have been starting the car, and 3 seconds later it will start to sound like its cammed(choppy idle) and then I will shut it off before it dies. Then I restart it and repeat this process about 3-4 times until it holds idle. I also have a vacuum/Boost gauge and the car starts to run smoother as soon as vacuum takes over and is below -10psi of vacuum.

FunkadelicxS40
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Re: Cold start issue 2004 s40 1.9L T5

Post by FunkadelicxS40 » Wed Dec 25, 2019 10:32 pm

I cleaned the idle air control valve with throttle body cleaner and when I started it up after replacing everything it started perfectly. The next day after sitting all night the issue returned but with less effort to get it to idle properly. It takes me only a few seconds of holding the throttle to get it to hold idle again. Thinking I may need to go back in and fully clean out the throttle body as I only cleaned the IAC and the entrance to the throttle body. I will have my brother take a look at it tomorrow and see if there is a vacuum leak and possibly clean the TB. Will post updates after.

boosteds40
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Re: Cold start issue 2004 s40 1.9L T5

Post by boosteds40 » Thu Dec 26, 2019 8:36 pm

I have wasted a lot of money tbh, but everything on my engine except the core has been cleaned, replaced or rebuilt. I have a feeling a vacuum leak is present because I have the code P0171, a very faint hissing sound coming from somewhere(dont know where though) and my vacuum reads 15 right at cold start up, and then after 2 seconds the vacuum starts to drop off in a matter of a second and then once it drops below -10psi of vacuum it starts to run rough and bearly run unless I give it a little throttle or let it die. But as soon as it switches from open to closed loop the vacuum takes over and run beautifully. I have a feeling the IAC valve is to blame and it is being improperly controlled by the ECU due to a software fault.

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alschnertz
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Re: Cold start issue 2004 s40 1.9L T5

Post by alschnertz » Sat Dec 28, 2019 12:46 pm

FunkadelicxS40 wrote:
Wed Dec 25, 2019 10:32 pm
I cleaned the idle air control valve with throttle body cleaner and when I started it up after replacing everything it started perfectly. The next day after sitting all night the issue returned but with less effort to get it to idle properly. It takes me only a few seconds of holding the throttle to get it to hold idle again. Thinking I may need to go back in and fully clean out the throttle body as I only cleaned the IAC and the entrance to the throttle body. I will have my brother take a look at it tomorrow and see if there is a vacuum leak and possibly clean the TB. Will post updates after.
Were you able to remove the IAC to give it a thorough cleaning? Just shooting TB cleaner inside without being able to shake it around may not be enough.
Same with the TB.
'60 PV544, '68 220, '70 145S, '86 745T, '95 854T, '01 S40
'84 Prelude
'06 MPV
'13 Ford Focus SE

boosteds40
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Re: Cold start issue 2004 s40 1.9L T5

Post by boosteds40 » Sat Dec 28, 2019 12:51 pm

Yeah I used brake cleaner inside and out of the intake system. I even bought a new throttle position sensor and it didn't change anything. Have you checked the small black hose coming from the intercooler to under the intake manifold? That seems to be a common problem, but I looked at mine and its fine.

FunkadelicxS40
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Re: Cold start issue 2004 s40 1.9L T5

Post by FunkadelicxS40 » Sat Dec 28, 2019 3:44 pm

Yes I removed the IAC valve and soaked it with throttle body cleaner for 5 mins. Cleaned it out with lots of q tips and brushed off the outside with an old toothbrush. I sprayed inside the tb and cleaned it a bit. I’m thinking may need to replace the IAC valve as it seems to still be getting stuck. My bro did some tests and most of my intercooler hoses are about gone and all the vacuum lines so I will replace those and see if it helps. Connected a boost/vacuum gauge and it looked good, but with a smoke test there were lots of leaks. Boosteds40 please start your own thread you are not helping.

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