NOT STARTING BACKFIRE INTAKE

  • Tiny
  • Saeed.almeq
  • 1995 Lexus LS 400
  • 180,000 miles

Engine cranking clockwise and backfire from intake, engine while cranking is trying to rotate counter clockwise?
Timing belt replaced
Spark plugs and wires ok + there order

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Tuesday, July 24th, 2012 AT 11:25 PM

10 Replies

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Sounds like a timing control failure. Could be failed timing belt.

Roy

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Wednesday, July 25th, 2012 AT 12:17 AM
  • Tiny
  • Saeed.almeq
  • Member

Checked timing belt twice its on the notch?

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Wednesday, July 25th, 2012 AT 8:09 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,556 posts

Start with a compression test and fuel pressure test. Get back to us with the results

Roy

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Wednesday, July 25th, 2012 AT 11:38 AM
  • Tiny
  • Saeed.almeq
  • Member

Checked compression all is above 170psi

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Friday, July 27th, 2012 AT 7:41 PM
  • Tiny
  • ASEMaster6371
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Ok, fuel pressure?

Roy

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Friday, July 27th, 2012 AT 9:28 PM
  • Tiny
  • Saeed.almeq
  • Member

Yes fuel pressure is 50+ psi
Injectors firing
Crank +cam sensors checked
No check engine light, no codes
Forget to mention that cylinder no1 has no compression at all

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Friday, July 27th, 2012 AT 9:51 PM
  • Tiny
  • ASEMaster6371
  • Expert
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Bingo, I bet you have a timing belt issue. If not, then you may have a burned valve.
Roy

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Saturday, July 28th, 2012 AT 7:51 PM
  • Tiny
  • Saeed.almeq
  • Member

Hi roy
i rotate the crank several times and check timing marks there ok
but im thinking that timing belt is for a 99 ls400

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Saturday, July 28th, 2012 AT 9:02 PM
  • Tiny
  • Saeed.almeq
  • Member

And what I should do with the cylinder that dont have comperession?

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Saturday, July 28th, 2012 AT 9:04 PM
  • Tiny
  • ASEMaster6371
  • Expert
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Inject air into the cylinder to find out where the leakage is coming from. Then you will have to remove the head and perform the needed repairs.

Roy

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Sunday, July 29th, 2012 AT 2:16 PM

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