noslliw1 Posted May 11, 2016 Share Posted May 11, 2016 (edited) 1999 Subaru Legacy 2.2L AT Wagon 2.5L block, 2.2L single port heads with correct MLS HG for block Delta 1500 grind KN filter on the stock cold air intake Problem: Starts OK then stalls after 3 seconds Recent maintenance: New battery Replaced plugs & wires with new NGK New coil pack New fuel filter New alternator I cleaned the MAF with MAF cleaner. Then the problem started Car had been running good on the road; some minor stumbling between 1000-1200 rpm Problem troubleshooting; What I've tried so far: No CEL Disconnected MAF; would not run New MAF sensor; reset ECM by disconnecting battery for 30 minutes; no luck Disconnected MAF; would not run Disconnected battery over night; no luck Swapped out fuel pump with known good spare Visually checked for vacuum leaks; not that many hoses No CEL Next: IACV? ECM? 22611 AD66B DY7 80 Edited May 11, 2016 by noslliw1 Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted May 12, 2016 Share Posted May 12, 2016 Loose hose on the intake tube. The big one for the IAC usually gets overlooked because it looks like its in the right spot. The hoses from the valve covers that attach on the back/bottom of the tube need to be connected at both ends, and the one next to the PCV hose. 2 Quote Link to comment Share on other sites More sharing options...
noslliw1 Posted May 15, 2016 Author Share Posted May 15, 2016 Thanks for the suggestion. On this car (1999) there is no hose or connection for a hose on the intake tube. There are three that go right into the air box: 2 from the valve covers, and 1 from the big vertical hose that also connects to the PCV. I'm at a complete loss. Starts perfect, then stalls in about 3 seconds. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted May 15, 2016 Share Posted May 15, 2016 (edited) Sounds like its either getting un-metered air (air leak into intake tube between the MAF and throttle body), or MAF wiring could be damaged, Or fuel pressure is dropping off after it starts. Check the tube for any cracks, especially between the ripples where it flexes. If it has the resonator tube that sticks off the side, check where that connects to the main tube. Have seen them break there. Edited May 15, 2016 by Fairtax4me Quote Link to comment Share on other sites More sharing options...
Cougar Posted May 15, 2016 Share Posted May 15, 2016 I wonder if the ECU is shutting down the fuel system for some reason or the security system is involved. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted May 16, 2016 Share Posted May 16, 2016 sure there's no hose for the IAC? 1 Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted July 5, 2016 Share Posted July 5, 2016 any progress on this? Quote Link to comment Share on other sites More sharing options...
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