snellk2 Posted November 12, 2015 Share Posted November 12, 2015 Hey all I just bought a used motor with about 60,000 miles on it to replace mine with a thrown rod. It's a 2008 2.5i Impreza, non-turbo. Replacement motor went through a compression test and was said to have good compression. We replaced all the timing components, valve cover gaskets, spark plugs, and clutch. Went to turn it on and the motor wouldn't turn over on it's own. The starter spun the flywheel like it was supposed to but nothing happened. We then checked the fuel lines to make sure it was getting fuel pressure and it was. Then checked spark plugs and verified that we are getting spark as well. Motor still won't turn over. Can anyone help? I can give more info as needed. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
ocei77 Posted November 12, 2015 Share Posted November 12, 2015 Check your vacuum lines, especially the small one to the fuel presure regulator. If the 08 has the hose from the IAC to intake check that too. O. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted November 12, 2015 Share Posted November 12, 2015 +1 vacuum lines are often the cause of this. scan for OBDII codes Quote Link to comment Share on other sites More sharing options...
lmdew Posted November 12, 2015 Share Posted November 12, 2015 Make sure you used the correct timing marks and that the crank and left cam gear are the same as your old engine. Before you tear into the timing, put a cap full of gas in the intake, but it all back together and see if it starts If it cranks well, the battery and starter are good and it one of two things that's not allowing it to start: - no Fuel - no Spark 1+ for checking codes I'm sure you have, but double check all electrical connections - are the plugs fully seated. Quote Link to comment Share on other sites More sharing options...
ccrinc Posted November 12, 2015 Share Posted November 12, 2015 Make sure you used the correct timing marks and that the crank and left cam gear are the same as your old engine. 1+ for checking codes I'm sure you have, but double check all electrical connections - are the plugs fully seated. ^^^This.^^^ If those gears don't match your original engine, the car won't start. Period. Emily Quote Link to comment Share on other sites More sharing options...
snellk2 Posted November 13, 2015 Author Share Posted November 13, 2015 Ok, this is all great advice! I noticed you guys all mentioned the left cam gear. Is there something different about that side? The cam gear itself looks different than the right side. Also we scanned for codes and nothing is coming up. Quote Link to comment Share on other sites More sharing options...
ccrinc Posted November 13, 2015 Share Posted November 13, 2015 The left cam gear has reluctors on the back side which communicate with the cam angle sensor. Those are in the shape of raised bars. There will either be 2 or 7 bars. If the original engine had a 2 bar gear, then the one on the replacement engine must also have a 2 bar gear. Emily Quote Link to comment Share on other sites More sharing options...
snellk2 Posted November 14, 2015 Author Share Posted November 14, 2015 The left cam gear has reluctors on the back side which communicate with the cam angle sensor. Those are in the shape of raised bars. There will either be 2 or 7 bars. If the original engine had a 2 bar gear, then the one on the replacement engine must also have a 2 bar gear. Emily Thanks Emily! Is it possible that newer motor, even though it's from the same model year, could have a different left cam gear then? I don't have the original motor anymore, as it was turned in for a core refund. How would i tell if the car needs a 2 or 7 bar gear? Quote Link to comment Share on other sites More sharing options...
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