Timing helped but didnt help

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Timing helped but didnt help - 5/3/2007 3:49:55 PM    Chevyguy032   Posts: 170 Joined: 10/21/2006 Status: offline Ok so i did my timing the other day..and i noticed when the motor is cool it runs 100 percent better than it did..BUT once it warms up it will knock if you keeop the gas at a certain point..but wont really knock when you floor it...any ideas?? < Message edited by Chevyguy032 -- 5/6/2007 5:09:56 PM > _____________________________ 1987 K5 Blazer Motor: 350 TBI Trans: 4 Speed Manual 4wd Stance: 32x 11.5x15(stock) Post #: 1

RE: Timing helped but didnt help - 5/3/2007 5:53:21 PM    erauto   Posts: 23 Joined: 4/19/2007 Status: offline try good gas, 91 octane and up. smell your exhaust, maybe your cat is plugged, anyways remove it. its sucks. _____________________________ 1988 JIMMY 427 little M, vortec blower,methanal injection, holley stealth ram 950. 700r4 manual reverse shift, B M shifter. good transfer case. Tru trac 373. 3 inch lift on 33s. (in reply to Chevyguy032) Post #: 2

RE: Timing helped but didnt help - 5/3/2007 6:14:02 PM    swartlkk Posts: 14499 Joined: 5/1/2005 From: Waterloo, NY Status: offline I'm betting that your advance isn't working.  Does the truck have an electronic advance or does it still have the old vacuum advance?  And when you set initial timing, did you do it with the vacuum/electronic advance disconnected?  Also, have you checked the condition of the counter weights and springs on the mechanical advance under the rotor? And what good advice to remove the cat...  I don't think so..  While it is possible that it may be clogged, a working catalytic converter is much better for the environment, not to mention that it may cause the vehicle to fail inspection depending on where you live.  In NJ, if the inspector were to look, it would fail without a cat.  And before you say 'gut it', that will perform worse than a properly functioning catalytic converter.  If you need me to explain it further I can. A clogged catalytic converter should exibit symptoms even when cold, typically higher up in the RPMs...  Basically like the engine is being choked off.  It will get worse when hot. _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to erauto) Post #: 3

RE: Timing helped but didnt help - 5/6/2007 5:08:49 PM    Chevyguy032   Posts: 170 Joined: 10/21/2006 Status: offline well there are 2 electrical connectors to the distributor so i am guessing electonic advance..now when i did it the instructions said to unplug the tan/black wire from the bulk head...well i couldnt find any such wire..so i did the timing without unpluging anything..i drove it around the block..threw the timing light back on and it was still good...so i am guesing it really didnt need to be unplugged...and how would i check my counterweights and springs?? _____________________________ 1987 K5 Blazer Motor: 350 TBI Trans: 4 Speed Manual 4wd Stance: 32x 11.5x15(stock) (in reply to swartlkk) Post #: 4

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