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  #1  
Old 12-03-2003, 04:26 PM
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Join Date: Sep 2002
Location: NE
Posts: 133
cold weather blues

hey folks, here in beantown it was darned cold today. My question is my poor 190 hates to drive after a cold start. Basically it studders and shakes if you try to drive it before an honest five minutes warm up. After that time, lucky always drives like a dream. During the warm up lucky takes a while before the idle picks up to its usual warm temp idle of say 600 or 700rpm. Couple questions: should the car idle faster at start up on a cold day (it does not currently start at a higher rev)? Should I rev the engine to keep it up over 1krpm for the first thirty seconds or so or just let the poor thing suffer through it until it comes up to a steady idle? Secondly is this normal to need a good warmup time for an 85 with 190K. Will it do the car any harm to warm up out there or more to drive off before it's clearly ready?

thanks,
cdt
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  #2  
Old 12-03-2003, 06:25 PM
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Join Date: Feb 2003
Location: Ontario, Canada
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While I'm not familiar with your car, I can tell you this in " generic " terms.
When you go " key - on ", the ECU looks at the coolant temperature sensor & starts setting a basic fuel mixture.
If your temp. sensor is giving false readings, the ECU may not recognize the cold engine & therefore the mixture will be too lean & no " high idle " speed.
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  #3  
Old 12-03-2003, 07:05 PM
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It should rev higher. This is not normal. Could be a faulty temp sensor - that's a cheaper thing to replace than ECU.

Warm up time on a cold day - I've tried:

1. warming up 3 mins before driving off.
2. warming up 30 sec before driving off.

The smoothest ride is had with (1).
I don't mind investing 3 mins in warm up.

I wonder what is warm up time for some of our diesel engined forum members.
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  #4  
Old 12-03-2003, 10:17 PM
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Join Date: Oct 2001
Location: around Charlotte NC
Posts: 573
just a bit of time for a diesel

Folks,

I beleive each car has it's own quirks and personality. I have an 87 SDL with just over 250K on it. It starts right up even at 30* this morning - just 1 glow plug cycle of about 30 seconds I would guess.

It always sputters for a few seconds, seemingly typical of this engine and age. I raise the revs to about 1000 for 10-15 seconds and it is then running smooth enough to drive. My driveway is about 30 yards uphill, so it gets another 30 seconds of 1000-1500 rpm warm up backing out and going up the driveway. It is ready to go the 1/2 mile of neighborhoods at 35mph. By then I have heat coming from the vents. No problem merging onto a country road that runs at 55 mph speeds.

Chuck
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  #5  
Old 12-04-2003, 12:37 AM
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Join Date: Feb 2003
Location: Ontario, Canada
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Just to add a little more " generic " information to my previous post.
If you want to check the coolant temp. sensor, what you're looking for is something like 5 000 ohms resistance when cold, dropping to about 200 ohms when the coolant is hot.
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  #6  
Old 12-04-2003, 02:11 AM
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Join Date: Aug 2003
Location: NYC - Queens
Posts: 28
Tried new plugs?

If replacing your plugs solves your problem, try to see what caused the plugs to foul in the first place.

Bad modulator?
valve guides/seals?

have a competent tech check it out!
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  #7  
Old 12-04-2003, 10:40 AM
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Join Date: Sep 2002
Location: NE
Posts: 133
plugs

no plugs were just changed -unnecessarily- less than a month ago. Plugs looked fine. will try to locate and test other recomendations, thanks to all.

cdt
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  #8  
Old 12-04-2003, 12:01 PM
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Join Date: Jul 2003
Location: Montreal, Quebec
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I don't know too much about the 2.3 engine, but on the 103 engine, there is a cold start valve triggered by a coolant temp. sensor. It is basically an additional fuel injector that operates for up to 12-15 seconds after start-up, depending of the coolant temp. This could be your problem.
This morning our temperature was down to 8deg F and my faithfull 260E started and drove like it was 88 deg. Last winter, temp. got down to minus 35-38 deg. for days and never experiences your problems.I never let the car warmed-up idling.
Start, oil pressure up, drive away reasonnably. That's the best way to quickly warm-up an engine.
jackd
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  #9  
Old 12-04-2003, 03:44 PM
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Join Date: Jan 2002
Location: Mass.
Posts: 2,218
Quote:
Originally posted by roadsession
It should rev higher. This is not normal. Could be a faulty temp sensor - that's a cheaper thing to replace than ECU.

Warm up time on a cold day - I've tried:

1. warming up 3 mins before driving off.
2. warming up 30 sec before driving off.

The smoothest ride is had with (1).
I don't mind investing 3 mins in warm up.

I wonder what is warm up time for some of our diesel engined forum members.
well up here on the north shore it was a balmy 18deg f this morning ..
started the diesel, held it at 1000rpm for about 30seconds. drove off and at about 30mph took a solid 15-20 minutes to get to operating temperature (no block heater used).
i would estimate at half that time for full warmup would be necessary if the block heater had been on.

'scuse me - gotta run - we're going water skiing this afternoon
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