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Old 09-16-2017, 01:26 PM   #1
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Fuel pressure testing

Having some ongoing bogging issues with my 2002 986 S and now suspect fuel pump or regulator. Having a Bentley manual, it says PWIS required for 2002-2004.

Anyone perform a pressure test w/o further issues?

I've looked at the generic testers at Napa & Autozone. Considering buying on from Actron.


Last edited by onaFLYer; 09-16-2017 at 06:53 PM.
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Old 09-16-2017, 06:52 PM   #2
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bogging issue

Bought the tester from Summit. Works great. Shows 50lbs key on & 55-60 idle to about 3000 rpm. Which I believe translates to over 3 bar. Don't think this is the problem either with my bogging issue.
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Old 09-18-2017, 09:51 AM   #3
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A quick and risky way to check without a Tester is to remove the Schrader valve from the Test Port and crank briefly.Put a rag over the open port. It should produce a fountain of fuel. Careful ! Don't loose the valve when trying to re-insert it.Use the correct valve tool .You'll be really unhappy if you cross thread it because you used needle nose pliers.
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Old 09-18-2017, 06:37 PM   #4
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50 lbs pressure

No need to. Shows 50lbs + on tester. Considering raising car and testing again in gear. Which is when it happens most otherwise.

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