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Carrera Balkiness Season

With the onset of the cold and rainy weather here in the north east, my Carrera has decided to become balky. This behavior is more pronounced in the mornings when the car is cold and in the rain as today. I opened the engine cover expecting to find the distributor cap soaked but everything was dry in the engine bay.

Just having tuned up the car, I am wondering if this is normal for these DME cars. In the summer, the car behaved perfectly. I guess my real question is, how well do these cars run when cold? I always start the car and immediately take off.
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Indigowhale
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Old 10-25-2005, 01:53 PM
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As a one owner Carrera, I have noticed the same thing except once she gets to temp, she is ok. The morning cold which is high 50s to low 60s causes shaking at idle at least until the engine is past the first bar for temp. Usually in the cold for CA she runs even better and I was driving in the rain yesterday with both defrosters and heat running and was perfectly fine.
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Old 10-25-2005, 02:01 PM
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That is exactly my problem. Not clibing above 50 degrees here today and the car never went over the first bar, it stayed right below it and balked less as I got closer to home. It only does it as you press the accel. No big deal, but I would expect better. It was also raining cats and dogs, but the engine bay seemed to stay dry.

Does a Steve Wong chip improve any of this? I tried putting a chip from my 86 in and it behaved identically to the 84.

And how about that sub-idle dip? The car drops some 500-750 rpm or so after sitting half a minute or so.
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Indigowhale
1990 Carrera 4, 1984 Carrera, 1986 Carrera -
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Old 10-25-2005, 02:55 PM
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I have the same problem.

I am almost sure this symptoms are some sort of an intake leak.

Check the intake gaskets for tightness and/or the little boot. Sometimes one of those pesky little vacuum hoses crack and such. But I think Indigo knows that better than the rest of us...
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Old 10-25-2005, 03:09 PM
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Cold temps tend to make the DME run richer making it more likely to have your plugs load up and foul.
Old 10-26-2005, 12:36 AM
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Mine runs perfectly in any weather condition, even in the cold, rainy, hostile Swedish winters. Hence I would say your experiences are not "normal".
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Old 10-26-2005, 01:04 AM
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Anecdotal hearsay and likley useless ( that doesn't always stop me) but I've heard similiar symptoms attributed the Cylinder Head Temp needing replacement.

If it hasn't been done on your car, it's a job thet most 3.2s get sooner or later anyway.
Old 10-26-2005, 05:13 AM
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Quote:
Originally posted by livi
Mine runs perfectly in any weather condition, even in the cold, rainy, hostile Swedish winters. Hence I would say your experiences are not "normal".
Agreed, mine runs fine year round. The original poster mentioned he had a lot of rain in the area. How old are the plug wires and distributor cap?
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Old 10-26-2005, 05:27 AM
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Today here in Atlanta the morning temp was 39 deg.. My '84 Carrera stated just fine but I was near empty so I stopped by the gas station and filled up. 7 miles down the road the engine started misfiring and would only idle. Every time I stepped on the throttle it would stumble and backfire.. A few minutes later it ran perfectly so I continued on to work..25 miles later on the freeway I felt another miss but I made it to work.. I donít know if it was due to the low temp. or a bad tank of gas.. It will be in the low 60s when I head home, I will see she runs.
Old 10-26-2005, 05:40 AM
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I've driven my '86 during the last five winters with no problems. It gets cold here in Utah during Jan and Feb with mucho snow and have not had any issues. It has been in the high 30's low 40's in the AM for the last few weeks and she starts and runs perfect. She almost seems to run better in the cold air...
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Old 10-26-2005, 06:10 AM
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Yes, that head temperature sensor, replaced with the updated. Matter of fact, I've had the whole top of the engine off looking for clues and found a couple of intake gaskets partially sucked in. AFM, injectors, hoses, done them all. Brand new ignition wires. New fuel filter. You name it, done it. Replaced the DME chip, dual grounds, BG44K, etc., etc.

However, yesterday as I got home in the rain, I adjusted the idle up to about 950 and screwed in the AFM air mixture allen screw a turn or so to enrich the mix (I think).

Today, a bit cooler weather but dry, no balkiness at all.

So, I was running too lean or the car does not like moist air. I am becoming a great guesser, or the car was having a bad hair day yesterday.
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Last edited by indigowhale; 10-26-2005 at 03:31 PM..
Old 10-26-2005, 03:28 PM
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Could also be the gap on the Flywheel speed sensors. Or the speed sensors themselves. I found one that had all the outside rubber bits falling off...
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Old 10-26-2005, 07:29 PM
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Well with colder wheather, the balkiness has returned. Dry weather too. As I said, I drive right off without the car "warming up", but I expect better from the DME.

Is the head temperature sensor the only input to the DME that the car is cold? for some reason, the car is not getting enough fuel when cold. I replaced this part. No vacuum leaks either.

Anybody fix this problem not due to a vacuum leak or HTS?
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Old 10-31-2005, 10:10 AM
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How do you know the car is not getting enough fuel when cold? Is it just as possible that the opposite might be true?
Old 10-31-2005, 06:33 PM
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Reason is because when the engine is cold, the car is balky when taking off. Once it is warmer, the symptom is gone. I assume the engine requires a richer mix when cold that it is not getting. Reminds me of my carburated 911 when it was cold. Almost identicall behavior.
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Old 11-01-2005, 04:17 AM
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You may want to have your AFM checked as the contacts inside may be wearing through or spring tension may be off on the flapper. It may also need to be adjusted properly if it's out of adjustment. When was the last time you had the O2 sensor replaced?
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Old 11-01-2005, 05:11 AM
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O2 sensor replaced about 6,000 miles ago. Only thing about the AFM, if it were an iffy spot on the track, or tension issue, wouldn't do it when warm too? I actually replaced the AFM with one from a newer carrera with less miles after reconditioning mine. I took a pencil eraser and cleaned the tracks and the contact points.
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Old 11-01-2005, 05:39 AM
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Mine did the same sort of thing before I replaced the O2 sensor and had the AFM re-adjusted. It would balk at lite throttle under 3000 RPMs while cold. Actually would buck until warm. Once it was warmed up no bucking. If I gave it lite throttle you could still feel the hestiation but it just felt like it had a flat spot, if I gave it heaver throttle it was fine. My AFM was a rebuilt one but still needed to be adjusted. It could be other things as well, sort of trial and error as you rule out things.
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Old 11-01-2005, 06:56 AM
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I wonder if this balky behaviour has any correlation to Beru ignition cables? I wonder if this happens with Magnecores or Cewetts too?
Old 11-01-2005, 09:15 AM
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Dan and sltrj thanks for tuning in, we go way back with this issue. Dan, when they adjusted your AFM, did they calibrate your spring tension or set the idle mix? The idle mix screw turns in about 15 times. Mine is somewhere in the middle. Today it was warm in the DC area and no balkiness.

I have a new set of Clewett wires as the ones I had were updated and improved. The new ones are quite nice for the money.

The car is just about perfect except for this early morning balkiness:

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1987 944, 1979 SC, 1969 911T, 1971 914 -
Old 11-01-2005, 04:34 PM
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