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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?? |
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11-14-2020, 07:56 AM
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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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1985 911 with original 502 191 miles...808 198 km "The difference between genius and stupidity is that, genius has its limits". Albert Einstein. |
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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. |
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11-16-2020, 09:40 AM
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6 cylinder symphony
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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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'84 3.2 Targa '89 964 Coupe "What do you mean NEXT project?" - my wife |
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11-16-2020, 01:44 PM
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Quote:
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11-16-2020, 11:07 PM
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Join Date: Jun 2013
Posts: 491
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Quote:
From one PeterM to another Peter M! ICV controls bypass air at all temperatures. |
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11-17-2020, 12:24 AM
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Quote:
I will use that information in my own tread on idle issues |
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11-17-2020, 01:51 AM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
Posts: 5,022
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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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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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11-17-2020, 02:05 AM
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Reference and speed sensors could be starting to fail or covered with oil/dirt.
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11-17-2020, 06:08 AM
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6 cylinder symphony
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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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'84 3.2 Targa '89 964 Coupe "What do you mean NEXT project?" - my wife |
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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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Kevin 1986 Carrera Targa |
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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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Kevin 1986 Carrera Targa |
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11-18-2020, 02:22 AM
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Hester
911
