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Join Date: Jan 2012
Location: Toronto Canada
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Red face cold start problem not resolved

1987 Carrera
With the engine totally cold, started the car. The engine starts right away but in a missing fashion for about 2 seconds and then goes to 1200 RPM...And does its routine going down to 900 as programmed. The funny thing is that if I start it again 5 or 6 hours later, it starts properly, no hesitation
I did remove the valve cover on the upper left side, there were a few smears of oil but the roker shafts seem to be at in their place, changed the gasket and secured the plugs wires with RSR hold downs.
Just installed a new fuel pump so it is not the check valve
Any thoughts??

Old 11-14-2020, 07:56 AM
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Old 11-15-2020, 06:06 AM
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David you post is like guessing game.Not solved..what did you do to try to solve it , that would help to mention here,how about that?.... so people can actually follow....
Ivan
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Old 11-15-2020, 09:09 AM
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problem with cold start

I did what was described and awaiting new wormer spark plugs non resistive to replace the current ones.
Other then that, I do not have any ideas of what to do next to resolve the cold start "missing" symptom...
It is not a big deal because it only lasts for 2-3 seconds...but it annoys me.
Old 11-16-2020, 09:40 AM
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My cars did exactly what you described until the Idle Control Valve completely failed. Once replaced - problem solved. My guess is that your ICV is failing.
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Old 11-16-2020, 01:44 PM
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Quote:
Originally Posted by Kidasters View Post
My cars did exactly what you described until the Idle Control Valve completely failed. Once replaced - problem solved. My guess is that your ICV is failing.
Does the Idle Control Valve control the bypass air, only when the engine is cold, or also when it is warm ?
Old 11-16-2020, 11:07 PM
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Originally Posted by PeterM View Post
Does the Idle Control Valve control the bypass air, only when the engine is cold, or also when it is warm ?

From one PeterM to another Peter M!

ICV controls bypass air at all temperatures.
Old 11-17-2020, 12:24 AM
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Originally Posted by Peter M View Post
From one PeterM to another Peter M!

ICV controls bypass air at all temperatures.
Many thanks Peter M - great name you have !

I will use that information in my own tread on idle issues
Old 11-17-2020, 01:51 AM
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Please test things instead of replacing them. A fuel pressure meter hooked to the fuel rail would have saved the cost of a fuel pump.

Things to check at this point.
- ICV
- Idle position switch
- Cylinder head temp sensor

And doing the idle speed setting procedure would be good about now.
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Old 11-17-2020, 02:05 AM
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Reference and speed sensors could be starting to fail or covered with oil/dirt.
Old 11-17-2020, 06:08 AM
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CHT sensor is a good one. I had changed mine a few years ago when it failed as well, so that's why I didn't bring it up.

It's not a hard fix - just a little tricky getting the socket on the sensor.
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Old 11-17-2020, 06:24 AM
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Subscribed. Same symptoms except mine chokes and coughs for about 15 seconds before it revs up and down. Then like yours its fine. Even after sitting for hours.

I took it in for this. They did a smoke test on the vacuum line and replaced several hoses. Didn’t fix it....
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1986 Carrera Targa
Old 11-17-2020, 06:09 PM
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Oh, forgot to mention that I get a nice bit of white smoke now that accompanies the choking. This is new too.

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1986 Carrera Targa
Old 11-18-2020, 02:22 AM
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