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Problems starting engine in rain.

When i went to start my car up last night it had some trouble starting but after it warmed up the engine was fine. The same thing happened today. It seems the rain is affecting how it starts. Could this be from a cracked distributor cap? I haven't actually gone and check it yet because it has been raining.

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1984 944 N/A
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If you can't dazzle them with brilliance, baffle them with bull. - W. C. Fields
Old 10-27-2003, 12:27 PM
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Sitting in the rain or from driving in the rain?

Driving: Your timing belt will pick up water through the crank pulleys and stuff it into the dist cap if the baffel-cover is missing behind the rotor.

In rare cases I've seen the terminals on the water pump get wet and loose condutivity.
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Hugh - So Cal 83 944 Driver Person
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When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Old 10-27-2003, 12:46 PM
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no problem when driving or sitting but when i first start up the car after it has been raining it takes more cranking then usual.
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1984 944 N/A
1996 Golf Gl
Drive fast. Take chances.

If you can't dazzle them with brilliance, baffle them with bull. - W. C. Fields
Old 10-27-2003, 04:49 PM
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SoCal, water getting through the bottom of the windshield/firewall area into the electronics?
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Old 10-27-2003, 07:53 PM
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That is a possibility because I park on an incline. The water may not be draining well.
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1984 944 N/A
1996 Golf Gl
Drive fast. Take chances.

If you can't dazzle them with brilliance, baffle them with bull. - W. C. Fields
Old 10-27-2003, 08:19 PM
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yep, right around the area of the battery box could be a potential culprit
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Old 10-27-2003, 08:30 PM
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Quote:
Originally posted by ronin
SoCal, water getting through the bottom of the windshield/firewall area into the electronics?
84 has it mounted under the steering column just above the drivers knees.

Could be getting the terminals on the battery soggy. A bad terminal will cause a bit of resistance when wet. If driving in the rain then the starter terminals could be wet also.

Can't think of anything else that will get wet if the car is left standing other than the battery.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Never break more than you fix!
Old 10-27-2003, 10:59 PM
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y'know, I've been meaning to see what I could find under the column. what type of FI system does the 84 have? does it have an ECU?
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Old 10-27-2003, 11:10 PM
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The 83, 84 and early 85's have 95% of the same DME brain as the later NA 944's. As you have read when some what to use a newer DME in a later car they have to change out the AFS and the idle possitioner.

The air flow sensor uses a lower control voltage, 4 rather that 8 VDC, and had a slightly different resistence curve. The idle possitioner is controlled by the DME rather than being a timed valve (heated bimetalic spring).

They use the same plug with the newer DME having a few extra wires for the idle possitioner.

Think the 951 DME uses the same plug.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 10-27-2003, 11:19 PM
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yes, I do remember the issue of having to change the AFS and i/p for the later DME. interesting to note (I just found out) that the self-diagnostic process wasn't available until 88. (that's what I refer to as an ECU) curious that they would put the DME on the steering column. same place as the central locking control unit
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Old 10-27-2003, 11:29 PM
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"curious that they would put the DME on the steering column. same place as the central locking control unit."

If you already have a mounting bracket there why not use it.

Some of the changes make sense; some don't.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 10-28-2003, 06:42 AM
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definitely makes it easier to get at as well. I had my power locks stop working one day and I said to myself "I'll fix it when I get home." I jumped into the car and noticed something rubbing against my leg. I looked underneath and saw the central locking control just haning there(!) I simply plugged it back in and voila! easiest fix ever
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Old 10-28-2003, 10:08 AM
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that would have been nice! but cinsidering that this incident happened right at the end of a date with my girlfriend, it would have been awkward to say the least! and what kind of chick fits in the footwell these days anyway??
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Old 10-28-2003, 10:25 AM
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oh gawd! lol
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Old 10-28-2003, 10:35 AM
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Knackered ignition leads. They have cracked inside and in damp conditions the spark jumps to surround. Once warmed up the cable expands and closes the cracks. Seen it several times causing bad or no damp starting. Get yourself a good, new set of ignition leads.

Mark

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Old 10-28-2003, 01:45 PM
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