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why is my timing retarded? repost from the 700 board 200

posted by  someone claiming to be bourbonbrick on  Tue Sep 21 05:17 CST 2004 [RELATED]

Hi guys,

I tried posting this on the 700 board, but didn't get any responses. I'll try it here.

I'm new here and I've got a technical question I hope you can help me with. Let me know if I'm in the wrong section.

I checked the timing on my brick (88 740 2.3L non-turbo) and with the engine warm and idling, I get a timing reading of 0 degrees. I am concerned since it is supposed to be 12degrees BTDC. I did a search and found that the marks on the balancer can slip causing an erroneous timing reading. So, I took off the harmonic balancer and checked the alignment of the timing belt and everything is still aligned at 0 degrees.

So, my timing belt is ok, my balancer has not slipped, so this means my timing is being retarded BY something. Figuring a bad knock sensor, I unplug its connector and redo the timing check... doesn't change at all... still 0degrees. I install a new knock sensor... same thing, no change in timing.

I also read that a plugged cat can retard the timing (my cat is 1 year old), so I removed a port plug just in front of the cat to remove a little backpressure... no change in timing.

My next thought is that I have bad wiring from the knock sensor to the ignition computer... but I don't know where the ignition computer is located...

Am I on the right track here? Can anyone help me out?

BTW... all other Fuel injection components diagnose as OK... injectors, amm, the fuel pressure regulator is new and working, pumps, throttle position switch, etc.

I would really appreciate your thoughts on this.

THanks.






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