Stock D-jet 1,7 running wery lean but why? S O L V E D Options

[larss]

Have some problems with a stock 1,7 D-jet that runs wery lean, hunts and pops in the intake, hardly running at all....reving up wery uneven and slowly.

-Engine has not been running for severeal years so there is no history to tell.
-Timing triple checked 27 degrees at 3500rpm
-Fuel pressure triple checked 31psi
-All 4 injectors new (repro)
-Trigger points checked OK
-Changed to anoter MPS (which runs well in another d-jet) with no difference
-Changed head temp sensor with no difference
-Compression tested, even around 145psi
-Points, condenser, cap, cables are new (also tested with an old set but no difference)
-All injectors getting pulses, checked and injector plugs are at the correct injectors
-Yes firing order is triple checked

The only way to get it running quite OK is to replace the head temp sensor with a potentiometer at 3Kohms, runs quite good with that even when warm.
This leads me to think that it is running w e r y lean for some reason.

Any ideas?

/Lars S

[BillC]

Have you checked for a vacuum leak (or leaks)? Since you already tried a different MPS, looking for leaks is the next thing to check.

If the vacuum and intake hoses haven't been replaced in a while, start there. Also, check the intake manifold (the sheet metal piece that the throttle body mounts to) to make sure there are no rust pinholes in the bottom (fairly common problem, especially when the car sits for a while).