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1949 GMC Pickup Reg Cab Base

1949 GMC Pickup Reg Cab
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June 25, 2011, 4:20 pm

 
 

Question: time my engine 5.7 efi 1987 runs starts but no power

my 1987 5.7 efi the timing mark with timing light is at noon position on the crank way before the timing pointer scale, how do i get the crank mark back on the scale so truck runs correctly it starts and runs now but no power at all wants to stall out when i give the gas , how to get back to factory timing position plate


June 27, 2011, 4:23 pm

Elizabeth K
Expert Mechanic

Here's a video on how to adjust the timing:
http://www.youtube.com/watch?v=UYGU7mTwsZc

You can find the spec to set truck at on a label under the hood. Here's a thread with some info on a wire you need to disconnect before you set it:
http://www.gm-trucks.com/forums/index.php?showtopic=126745

If you cannot get the timing set properly by adjusting the distributor, the timing chain may have jumped a tooth and will need to be replaced.


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