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Spark not on compression stroke

Tiny
RSDIN559
  • MEMBER
  • 2003 TOYOTA RAV4
  • 215,000 MILES
I rebuilt the engine. I'm trying to start it, but the spark is not on the compression stroke. It's 180 degrees off. I was very careful to make sure the chain and all marks lined up. Could this be a problem with the cam position sensor, or is it something else. Thanks in advance.
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Monday, September 17th, 2012 AT 11:46 PM

3 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Put it on compression stroke on #1 cyl. Then turn the crank until the piston gets to tdc. Check the timing marks if they line up or not?
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Tuesday, September 18th, 2012 AT 1:05 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If the ignition timing is 180Â off, the timing chain installation should be correct. Either the crank position or camshaft position sensor plate is installed reversedly.
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Tuesday, September 18th, 2012 AT 8:57 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Most probably this is where you went wrong.
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Tuesday, September 18th, 2012 AT 9:00 AM

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