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Cold start issues.

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pb49415
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Cold start issues.

Post by pb49415 » Thu Jan 10, 2019 2:39 am

My 1998 S70 is having cold starting issues. Since winter began. Once again I’m having startup problems. When I initially crank it over it fires up and then stalls. Takes about 5 minutes of sitting and sometimes leaving the ignition on before it will fire and stay running. During the warmer months it behaves normal. It’s only during cold winter days/nights when it’s parked for a few hours outside. Typically below 25degs F. Looking for some information on what might be going on?

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Re: Cold start issues.

Post by Ozark Lee » Thu Jan 10, 2019 4:59 pm

How does the temp gauge behave? Does it go to the 3:00 position and stay there?

A bad ECT sensor can cause your problem but so can a weak fuel pump.

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Re: Cold start issues.

Post by misha » Thu Jan 10, 2019 5:17 pm

...or fuel pump relay.
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pb49415
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Year and Model: 1998 S70
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Re: Cold start issues.

Post by pb49415 » Thu Jan 10, 2019 7:56 pm

Temp needle goes a little higher than 3 o’clock position. But, once it’s there it stays there. I don’t know anything about an ECT sensor. Where it is or what it does.

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Re: Cold start issues.

Post by WhatAmIDoing » Thu Jan 10, 2019 10:47 pm

The ECT measures the coolant temperature. It is located near the thermostat. If it is reading out of spec, you will get starting issues. The fuel pump relay is also easy to test. Can you hear the fuel pump prime when you turn the key to POS II?
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Re: Cold start issues.

Post by dj_v70 » Fri Jan 11, 2019 6:43 am

pb49415 wrote:
Thu Jan 10, 2019 2:39 am
When I initially crank it over it fires up and then stalls. Takes about 5 minutes of sitting and sometimes leaving the ignition on before it will fire and stay running.
It sounds like engine is flooding for some reason. Do you smell gas at exhaust pipe after it stalls? After it stalls, press gas pedal to floor and hold it there to see if you can start it by cranking for 10 seconds or so (if it is on the verge of starting, keep cranking until engine starts to rev up and hold rpms at 2k until runs smoothly). If so, engine is getting flooded. That would narrow it down a bit.

pb49415
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Re: Cold start issues.

Post by pb49415 » Fri Jan 11, 2019 7:05 am

That’s what my original thoughts were too. But, the only difference is that if I leave the ignition on for a full minute before starting, I’ll fire and stay running. It would seem to me that if it were flooded it would have more trouble. Anything let’s say above 30 degrees it’ll start and run fine. It’s only if it sits out overnight while I’m in the shop working.

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Re: Cold start issues.

Post by dj_v70 » Fri Jan 11, 2019 9:41 am

Just to be clear, are you saying that the car starts/runs fine when its cold as long as you let the ignition stay in pos 2 for a full minute without starting? If that is the case, sounds like fuel pressure is having hard time getting up to full pressure. I have read on these forums that some have used cheap tire pressure gauges to check fuel pressure on fuel rail. I'd give that a try while a helper cranks the car.

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Re: Cold start issues.

Post by pb49415 » Fri Jan 11, 2019 9:53 am

That sounds about right. Pressure would make sense. What should the pressure read?

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Re: Cold start issues.

Post by dj_v70 » Fri Jan 11, 2019 10:08 am

Somewhere between 40 and 50psi.

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