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1995 GMC Timing problem
Sent to Car Experts September 14 09:56 PM

I have a 1995 GMC pickup truck. Three months ago I replaced the engine with a NEW 1998 350 ci vortec engine, I set the timing on "0" dead center. It ran so bad that I had to aadvance the timing about 12 degrees just so it woukd not spit back thru the throttle body. When the engine was installed, I also installed a new distributor, new AC plugs, new plug wires, new ignition coil, new fuel pump and filter. I would appreciate any thoughts you might have. P.S. The engine vacuum is a steady 19 in.

Ray

 

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1995 GMC pickup 350 vortec

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Answer
September 14 10:12 PM (16 minutes and 30 seconds later)
         
REPLIEDCheck Mark
Hi. The distributor timing on you set up is a little different than most chevys. Put the engine at top dead center of the compression stroke. Remove the distributor cap and look down at the distributor. You will see a notch that the rotor should be pointing to. In order to change the timing you need to unplug a tan wire with a black tracer that is located near the fuel pump relay(passenger fire wall) Unplug it and plug it back in with the engine off. While it is unplugged you can adjust the timing to specs.

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C.J. -- Auto Service Technician -- 96% Positive Feedback on 58 Car Accepts
ASE master certified, L1 certified, WA state emmissions, 19 years experience, foreign and domestic!
Reply
September 14 10:25 PM (12 minutes and 47 seconds later)
         
Reply to C.J.'s Post: The procedure you mention is how I adjusted the timing. After putting the engine on TDC,and disconnecting the spout, I used my timing light to set it on "0". I started the engine and began advancing my timing until the engine smoothed out. I then disconnected the spout and took another reading.
Customer (name blocked for privacy)
Answer
September 14 10:30 PM (5 minutes and 28 seconds later)
         
ACCEPTEDCheck Mark
Hi again. Adjustments need to be made with the spout disconnected. When the timing is set and the distributor is stabbed right the wires usually point off to both sides at almost 90 degrees from the engine. If the distributor is off a tooth you can get the timing to read 0 and it still won't run right. Weird huh.

If I answered your question choose accept but if you still need more help just ask, I'm here for YOU.
C.J. -- Auto Service Technician -- 96% Positive Feedback on 58 Car Accepts
ASE master certified, L1 certified, WA state emmissions, 19 years experience, foreign and domestic!
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