[Peugeot-L] Re: 89 405 Mi16 - rough idle, buzzing fuel pump

Blade,

Check fuel pressure regulator usually locateed on fuel rail. Pull vacume hose off and see if gas comes out. If so, diaphram has hole in it and is no good. There should be a schrader valve on fuel rail. Hook up pressure tester to that. Don't recallwhat correct pressure should be but if it goes sky high on the gauge, its no good. I had same symptoms on a 505 turbo a few years ago. the high pressure caused the fuel pump to buzz like crazy and car ran rough from all the fuel being forced through the injectors.                                

• In peugeot-L@yahoogroups.com, "blade44m" <zaphod44@...> wrote:
  >
  > I went ahead and checked the compression as was suggested today.
  > Cylinders 1-3 are all within 5 of 200 PSI. The 4th showed 170, but
  > that may have been because it was the last one I checked and the
  > battery was getting a bit flat. I squirted oil into that cylinder,
  > and it went up to 250 PSI. I'll drive it around a bit and then
  > recheck them.
  >
  > The car still idles poorly and shakes really bad. It kind of seems
  > like it's running lean at idle. I swapped out the idle control
  valve
  > and the entire airbox from my good running Mi16, and it made no
  > difference. Anything else I can check next?
  >
  > There is also another problem that maybe you guys can offer some
  > help about. The car heats up very quickly. The fans come on slowly
  > within just a couple minutes of the engine being started, and they
  > come on full blast within 5 minutes. The inside temp sensor never
  > even gets up to 190 like my other 405 does. Also, the radiator is
  > still super cold when they come on! I think I'll replace the
  > thermostat and flush the cooling system, but are there any other
  > temp sensors I should test or replace? I see at least 3 sensors on
  > the thermostat block, but I don't know which one does what. I think
  > this is probably related to the idle.
  >
  > --- In peugeot-L@yahoogroups.com, "mike aube" <maube@> wrote:
  > >
  > > On something like this you start with the basics, take a
  > compression test to make sure that the engine is good to start off
  > with.
  > > ----- Original Message -----
  > > From: blade44m
  > > To: peugeot-L@yahoogroups.com
  > > Sent: Tuesday, January 01, 2008 3:33 PM
  > > Subject: [Peugeot-L] 89 405 Mi16 - rough idle, buzzing fuel pump
  > >
  > >
  > > Well, I got the new clutch in my "new" free 405 Mi16, and now
  > there's
  > > another French car back on the road! Next, I need to get it
  > smogged.
  > > The car starts easily and moves out pretty good, but it idles
  > very
  > > roughly. It doesn't surge or hunt for idle, but it idles at
  > about 800
  > > RPM, shakes really bad, and sounds like it's running on 2 or 3
  > > cylinders. The check engine light does not come on. However,
  the
  > fuel
  > > pump always buzzes while the car is running, and I've never
  > > experienced this on any Mi16 before.
  > >
  > > I've checked all hoses and wires, cleaned out the idle control
  > valve,
  > > replaced the plugs, checked/cleaned the distributor cap and
  > rotor
  > > (they're newish and look good), cleaned the air filter (it's
  new
  > too),
  > > but the problem persists. As soon as I give it any gas at all,
  > it runs
  > > smoothly. Does anyone have any idea what could be wrong?
  Thanks!
  > >
  > >
  > >
  > >
  > >
  > > [Non-text portions of this message have been removed]
  > >
  >