CIS-E Problem[NG CIS-E3

[Ben Swann]

Though I may have overlooked something here, I did replace the entires fuel pump, including check valve.. see below.

[Ben,

If you're experiencing leak down, and you're not flooded when you start, then I'd save a whole lot of money and rather than just replacing the accumulator (sp?) and the injectors, and replace the check valve at the fuel pump.  Very easy to get to, cheap, and it doesn't take much for it to fail.  BTDT. 

-- This does come with the pump, right?  I can certainly backtrack here and double check, but entire assembly as I explained was replaced, including the check valve, which is crewed directly into the pump - correct?

 The next question is why should that matter?  When you first turn the key to the "on" position, if the residual pressure isn't high enough, the fuel pump should run for a second or two. 

- Are you sure about that.  I was not aware of this feature.  I don't think this happens as you describe.  If so where is the fuel pressure sensor that tell the relay to run?  Also, I can force the pump to run and charge the "system" and it makes no difference.  

 During cranking, the fuel pressure builds very quickly (with the fuel pump running) to 5 bar (or so, depends on system, could be 5.4-5.8 also) within .75 seconds.  When the engine is shut down, the residual fuel pressure drops back down to 2.3 bar to shut the injectors.  Bosch states that the
residual pressure should last at least an hour, my experience shows my CIS-E to go much longer than that.

-- Again only when I lift the airflow plate manually do I get enough fuel to start the engine.  Othwerwise, I can crank all day til the battery dies.  The engine vaccuem is tight and cranking is not enough to cause the plate to rise and get fuel to the injectors.  Perhaps something else is broken, but that is how it is working now.

-- I know I have a leakdown so I'm not sure how effective a fuel pressure test will be except to confirm that I have a leakdown.  Where else can a leakdown occur?  I do appreciate the answers, as although I think I know, I like confirmation.

--  I don't feel that I'm wasting my money on injectors, etc.  I know from experience the original injectors cerca 1987 tend to fail over time.  I want this car to last and be reliable.  Once I get the kinks worked out, I'll know what is new and not - currently one of the few things I did not replace is the injectors although it did get new seats and seals.  The accumulator may not be bad either, but I've seen the difference one can make.  When everything is working correctly as in my wifes 4kq, the engine should start immediately.

-- Just making sure we are providing correct information and Thanks for the feedback.

HTH.

Chris Locke
'86 4KCSTQ
'91 2C20VTQ]