jl_76 at hotmail.com
Fri Mar 27 01:34:43 PDT 2009
I've been trying to find the missing boost. It started intermittently, and no it's seems permanent 1.2 bar on the dash dial and that's with WOT on fift gear. I've checked the list on SJM site:
Check for any stored ECU fault codes, are the knock sensors working ok? "pulled codes yesterday, only code 2231, ISV is working, could faulty MAF do this"
Read the Measurement block values using the VAG-COM, look for anything out
of the range "haven't tried that yet"
Check basic engine timing, flywheel, camshaft and distributor rotor position "check"Check Throttle Cable Adjustment "check"Check Air Filter, is it really clogged up? "just put in new one"
Check/Replace the Turbo Bypass Valve, check small vacuum/boost hose to this
valve "checked, should be OK"
Check Idle Stabilizer Hoses, and other small vacuum/boost hoses "checked and replaced"
Check basic fuel pressure and correct operation of the rising rate fuel
pressure action by applying vacuum or boost to the vacuum/boost hose connection "checked and replaced"
Check fuel pressure regulator for leaking into the vacuum/boost hose fitting
"changed the pressure regulator, was leaking"Check ECU Connector Terminals for corrosion, remove connector and use
contact cleaner "cleaned"Replace small vacuum hose from Bypass valve to Intake Manifold (3B engine) "done"Check the Operation of the Multi-Function Temp Sensor (1991 200Tq 20V Only) "replaced, and have tried to disconnect it, no avail"
Temporarily disconnect Multi-Function Temp Sensor 4 pin connector and
recheck boost output (1991 200Tq 20V Only) "tried"Remove and inspect the Intercooler exit hose (Ribbed Hose) and the lower
turbo exit pressure hose for leaks. "doesn't leak"
Check the rubber hose between the intake pipe and the throttle body. "checked and cleaned"
Check Vacuum hoses and their connections at the back of the intake manifold "checked and replaced"
Check/Replace the coolant thermostat, is the engine running too cold? or too
hot? "this is still on to-do list, mind you temp is OK"
Check Engine Coolant Temperature Sensor Resistance and connector wiring "haven't tested, gauges are working ok though"
Check the operation of the Waste Gate Solenoid using the ECU Output Test "still to be done"
Check Waste Gate Solenoid hoses "checked out OK"
Check Air Temp sensor resistance at the ECU, and Repair the Air Temp Sensor
wiring connections if needed. "these were OK as well"
Check Throttle Position Switch/Potentiometer for intermittent operation "checked this, at least my multimeter didn't find anything wrong, resoldered the connections as well"
Check Altitude Sensor Voltage Output and wiring between sensor and ECU "still to be done"
Plug or pinch off hose to lower waste gate and check for maximum boost and
overboost cutout "still to be done"
Check Waste Gate for sticking open, defective spring? "need to get my hands on a vacuum pump"
Check the Exhaust System Back pressure, possible exhaust restriction "exhaust' fine, checked it yesterday"
Inspect the Turbo inlet vanes and end play, has the turbo compressor nut
left the building? or the turbo seized up, broken in half, or otherwise gone
south? "Turbo checked out, no end play, no extra sound"
My comments in red, other than that, the car runs fine, just got through the Finnish MOT inspection without any faults. So once I find the missing boost, I'm all set for the coming summer, seems quite long way away, -20 C this morning.
"It's not that I'm so smart, it's just that I stay with problems longer." - Albert Einstein
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