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98 Silverado- ENGINE KNOCK AND STALLING


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Thisislame123321
New User

Jul 11, 2014, 4:14 AM

Post #1 of 3 (1160 views)
98 Silverado- ENGINE KNOCK AND STALLING Sign In

Where to start... Well, I bought a truck that I had to do an engine swap on (1998 Chevy Silverado, 1500, 5.7 350 Vortec).. I did the swap and everything ran great. After it was up and running perfectly, i noticed a crack in the intake. So I went ahead and changed that and then the truck wouldn't start. I tried using quick start at one point, which produced a very loud backfire. After that I had realized it was only the timing, so I redid the timing exactly how it should be, and then it started. After it started that time, it was knocking very loudly, and running rough. After starting it a few more times, the knocking is bearly noticeable, but it keeps stalling, especially during acceleration (stepping on the gas in park). Is it possible that the backfire from the quick start could have caused damage somewhere? If so, could it have blown the engine completely? If not, what else could be causing the symptoms I've described? Could bent valves cause any of this? Please help! It sucks doing an engine swap, having it run great, changing the intake, and now having it running rough! Any reasonable answers are greatly appreciated. Thanks in advance.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 11, 2014, 4:41 AM

Post #2 of 3 (1147 views)
Re: 98 Silverado- ENGINE KNOCK AND STALLING Sign In

Timing not adjustable in this engine. Machine done with right equpment with it in exact (to the hair) in place, computer does the rest,


T



(This post was edited by Tom Greenleaf on Jul 11, 2014, 4:43 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 11, 2014, 5:11 AM

Post #3 of 3 (1137 views)
Re: 98 Silverado- ENGINE KNOCK AND STALLING Sign In

My guess would be that you dropped something down the intake while it was off and now you have big problems as far as the noise is concerned.
The timing cannot be changed. Moving the distributor changes the synchronization and it requires a professional scan tool to set it correctly.



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