# 1.8T 98 A4 issues. need some opinions **URL:** \ **Category:** Shift518 Automotive\ **Created:** [April 25, 2013, 6:39am UTC](https://forums.speedlife.net/t/1-8t-98-a4-issues-need-some-opinions/266871 "2013-04-25T06:39:31Z")\ **Posts on this page:** 1\ **Showing post:** 11
**Author:** ![DumpyBunny](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dumpybunny/32/6759_2.png) [@DumpyBunny](https://forums.speedlife.net/u/DumpyBunny)\ **Post date:** [April 28, 2013, 6:57am UTC](https://forums.speedlife.net/t/1-8t-98-a4-issues-need-some-opinions/266871/11 "2013-04-28T06:57:58Z")
> [@OFFICIAL: 2008 ELECTION THREAD](https://forums.speedlife.net/t/official-2008-election-thread/41192/1031): > > tune is from NA motorsports, its a run of the mill every day Unitronic Stage 1+ (+ is a gimic its for “aftermarket exhaust” so it probably does nothing more than raise the boost 1psi or something) tune. Stock turbo, stock injectors, etc. ONLY time I see a tune not be a flash and drive ordeal, is when the car has underlying problems. (like this one). The aggressive tune just makes them jump out more. Even well running 1.8T’s I have seen get flashed, and 100 miles later blow coil packs out of nowhere. Which I think this car also did in the beginning. 3 coils looked like OEM originals (green VW text and part numbers on top), and one was a black top no identification aftermarket replacement. > > This is an all or nothing money pit I think. Either put $140 battery in it, $100 thermostat, $300 maf (labor included) then cross your fingers the wiring/ecu isnt fucked and sees the maf… or you spend all that money + labor/materials to troubleshoot the wiring, and/or replace the ecu and have to pay a dealer to sync the immobilizer to even make the car run which is $$$$… it runs ok once warmed up, put a MBC in parallel to the n75 valve to cap the boost spike and off load it. All or nothing money pit is exactly what i see this as. I spent a couple hours working on this with my full version vag com. The number of intermitent sensors and other parameters was endless. There were 3 main issues that i picked out as clear a day being a shot maf, bad thermostat and possibly coolant temp sensor, and intermitent signal to the n75 boost control valve. Each one of these problems could cause poor running conditions, let alone all of them put back together. Even as farmiliar as i am with 1.8ts and vag com diagnostics there is no way i could have proceded with anymore troubleshooting untill the above problems are repaired. That is not saying that fixing those problems will solve the issue. all the sensors on the car are my eyes and ears on what the car i doing, take a couple of those away and the scales on my computer might as well be an etch-a-sketch. --- _[View the full topic](https://forums.speedlife.net/t/1-8t-98-a4-issues-need-some-opinions/266871)._