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

OnI 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 Onand 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),
  On> 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!
  >
  >
  >
  >
  > On
  > [Non-text portions of this message have been removed]
  >