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2003 a4 1.8 t auto troubleshooting

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2003 a4 1.8 t auto troubleshooting

Old 06-08-2016, 04:12 PM
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Default 2003 a4 1.8 t auto troubleshooting

Hello everyone, I would like to start out with a thank you! This is my first Audi/ turbo car so this forum has been a huge help diagnosing and repairing my car.

Anyway here goes, my car had no boost when purchased so I replaced turbo (was blown) still no boost, replaced diverter valve with blowoff valve, no boost, replaced n75 valve, no boost. Performed boost leak test three times, no leakes, flushed intercooler, eliminated catalytic converter, replaced plugs, coils, air filter, maf sensor, fuel injectors. I finally installed a boost gauge. with aftermarket blowoff valve I was reading vacuum at about -16 at idle but no boost, replaced blowoff valve with original (old) diverter valve and read no vacuum, no boost. Disconnected n75 from wastegate and read no vacuum and boost of 5 psi. Any help would be greatly appreciated, I'm out of ideas!! Just for a thorough history, I have also checked compression which is good, replaced timing belt, water pump, valve cover gasket,coolant temp sensor, thermostat, cam chain tensioner and installed aftermarket coil hold down brackets. car is only showing codes due to cat delete. Thank you in advance! Sorry for the long writeup
Cabinetconsultants.dan@gmail.c is offline  
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