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Registered
Join Date: Aug 2001
Location: Webster, NY, USA
Posts: 244
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warm-up regulator troubleshooting
I have a 1983SC that has a hesitation problem. It's pretty consistant so I feel that it is fuel problem. The problem is very noticeable cruising around 2500 rpm's. I've replace the fuel filter, air cleaner, plugs, cap & rotor. The car starts fine and seems to idle a little rough and at a slightly lower rpm than usual.
How can I tell if the warm-up regulator is functioning properly and not offering a restriction to the fuel supply? Otherwise, the car is in pristine condition with about 76K miles. Any other ideas? The car is in storage now but I can still get at the engine to try things. Thanks for any help. Michael |
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12-18-2004, 04:38 PM
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Registered
Join Date: Feb 2001
Location: Viera FL
Posts: 5,642
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Usually when the WUR goes bad, the symptoms include a poor idle and the inability to really give the car any gas until it has warmed up (WUR leans the car out too much).
Function is normally checked with a fuel pressure gauge between the fuel distributor and the WUR. On a cold engine, the fuel pressure going to the WUR rises at a steady rate (see diagram below) You will want to test this with the pressure gauges rather than by swapping parts - the WUR is pretty expensive. A few other things to check: Frequency valve: behind the airbox, when the car is running, you should be able to feel this valve vibrate. Pressure regulator in fuel distributor: O-rings fail. sensor plate warped\excessively dirty\out of adjustment. Here is the sheet with some of the fuel pressure values. AFJuvat 
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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12-18-2004, 05:10 PM
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Registered
Join Date: Oct 2000
Location: Nor-Cal
Posts: 4,403
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Re: warm-up regulator troubleshooting
Quote:
As AFJuvat said, you need to do a fuel pressure test to trully tell if your warm-up regulator is bad. You can throw parts at a CIS car all day long and not solve the problem, if you don't do a fuel pressure test. |
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12-18-2004, 05:32 PM
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Registered
Join Date: Feb 2002
Posts: 344
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1. Agree with the others that you start with a complete pressure test.
2. If 1 OK, set the CO properly using a gauge. 3. Then, and only then, start changing parts. |
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12-18-2004, 09:28 PM
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Registered
Join Date: Jul 2001
Location: Tuscaloosa Al
Posts: 1,175
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Try checking your vaccum advance on the distributor.
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John Brasfield 91 C2 78 SC For sale 76 3.6 68 Datsun 2000 Mr. Magoo, 02 330ci |
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12-18-2004, 09:48 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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I wouldn't rule out an ignition related problem just yet.
A consistent hesitation is just as likely ignition related. -Joe |
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12-19-2004, 08:17 AM
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