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1985 stumbles when letting off gas? (Read 31 times)
bret.allen8
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1985 stumbles when letting off gas?
Nov 8th, 2019 at 6:53pm
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Hello, I recently purchased a 1985 NA 944. It's in perfect mechanical condition except one small thing. When I take the load off the engine, the RPMs drop dangerously low for just a second and then it recovers and idles correctly. I can be in neutral, tap on the throttle, and when it goes back down it drops too much, then goes back up to normal idle RPMs. I assume something controlling the idle speed is not functioning properly. Any help is appreciated, thanks! It's never died on me but gets pretty close to it.
  
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Dave W
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Re: 1985 stumbles when letting off gas?
Reply #1 - Nov 8th, 2019 at 7:12pm
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This is a minor problem in the programming.  There is a way to "fix" it.  You can adjust the TPS so that the idle switch never closes.
  

Dave - black 84 no longer exists. Sad 83 self destructed. All better now. Smiley
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bret.allen8
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Re: 1985 stumbles when letting off gas?
Reply #2 - Nov 8th, 2019 at 7:24pm
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Dave W wrote on Nov 8th, 2019 at 7:12pm:
This is a minor problem in the programming.  There is a way to "fix" it.  You can adjust the TPS so that the idle switch never closes.


TPS gotcha. I'll check it out in a little and let you know the results. Thanks!
  
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bret.allen8
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Re: 1985 stumbles when letting off gas?
Reply #3 - Nov 8th, 2019 at 7:36pm
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I found out this issue is referred to as the "944 shudder". Must be common. I'll check TPS and anything else people recommending. I couldn't find the threads earlier because I had no idea how to word it lol.
  
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