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Re: Kangaroo
Posted by David Prantl (more from David Prantl) on Tue, 2 Jan 2001 01:24:04
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

OK.  Since it's an '87, it probably has the Bosch LH2.2 fuel system.  If the 
APC system has been messed-with, I would make sure it is restored to stock 
condition before throubleshooting further.

Here's what I'd do.

Make sure all rubber intake plumbing is properly sealed and leak-free.

Make sure all vacuum hoses are properly attached and leak free.
Replace these as necessary.

Make sure your turbo-bypass (hooter) valve is not busted.  Replace if 
necessary.

Make sure the throttle is set-up correctly.  If it has an air-bypass screw, 
adjust that to spec.  Adjust the throttle-plate rest-position to spec.  Now 
make sure the throttle switch is set up properly, and functioning as it 
should be.  Make sure the throttle damper is working so that the throttle 
doesn't slam shut when the pedal is released.  Finally, make the necessary 
adjustments so that the idle-control valve is operating at the proper 
duty-cycle at idle, and that the idle lambda signal (average voltage, or 
better still, frequency/amplitude) is correct.

Make sure your fuel-pressure-regulator is not dumping fuel into the manifold 
through it's vacuum hose, and test the vacuum/no-vacuum fuel-rail pressure 
to make sure the regulator is functioning correctly.  This allows you to 
test fuel pump output pressure and flow capacity, to verify that both are in 
spec.

If everything is OK thus far and the problem persists, I would disconnect 
each vacuum-operated system, one by one, and plug the corresponding manifold 
vacuum port.  Drive the car without heater-vent-control vacuum, without 
charcoal-canister function, without PCV, and if you're really brave, without 
brake-assist !  See if the problem can thus be traced to one of these 
systems.

If EVERYTHING is perfect, and the problem refuses to go away, the only 
recourse I know of is to start swapping components from a perfectly-running 
car.  Do the throttle-position switch, idle-control valve, air-mass-meter, 
and finally, the Jetronic computer.  Check that all electrical 
signals/connections at the AMM and ECU are correct.

Best of luck.

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP
'86 9000T, 5M, 182kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 133kMi
'93 9000CSET, 5M, 64kMi
'89 900, 3A, 115kMi
'68 97 Sonett V4, 76kMi, #000467

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