[Main 9000 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos Not really Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Mon, 13 Dec 2004 10:17:06 In Reply to: Is there anyway to test a DIC...., Robert, Mon, 13 Dec 2004 09:20:18 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

The DI tends to either work or not work. Some go directly from just fine to completely dead. Some give a little warning, like sputtering and misfiring. But a slight hiccup is probably not causing the problem.

About the only test of the DI is to put it on a car and see if the engine runs.

Since one plug is a little darker, you may have a leaky or sticky injector which is stuffing in more fuel to that cylinder than the system calls for. That would cause a darker plug and higher HC. A bad Fuel Pressure Regulator (FPR) could cause it, or a leak in the hose between the intake manifold and the FPR.

I'd put my money on the FPR. You seem to have the problem at idle. The FPR reduces fuel pressure at idle, because the intake is at vacuum. The amount of fuel that sprays in is a function of pressure differential, so to keep too much fuel from spraying in at idle (high vaccum) fuel pressure is reduced. As the intake gets nearer atmospheric (or above, in the case of the turbo), the FPR increases fuel pressure, in order to squirt the fuel in against the higher internal pressure.

180 vs 291 may be almost a factor of 2, but it's not a lot. You could be running slighty rich, not enough to really see dark plugs, and still miss the HC levels. So I'd check for things that can cause rich running - bad FPR, including one with a leaking diaphram or bad vaccum line; sticky fuel injectors, etc.

posted by 192.249....

• Is there anyway to test a DIC...., Robert, Mon, 13 Dec 2004 09:20:18
  • the only test I have done..., Chris M, Wed, 15 Dec 2004 11:32:22
  • Not really, Ari , Mon, 13 Dec 2004 10:17:06 <-- Viewing This Message
    • Ari, thats some great info....., robert, Mon, 13 Dec 2004 10:25:43
      • Re: Ari, thats some great info....., Ari , Mon, 13 Dec 2004 10:56:19
        • Well I guess if I get a mouth full...., Robert, Mon, 13 Dec 2004 11:34:29
          • Really faulty, Ari , Tue, 14 Dec 2004 05:24:17
          • The Hayne's manual is pretty good..., turrbo , Mon, 13 Dec 2004 20:00:41

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