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Help!!!! backfireing problem

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Old 02-16-2010, 05:16 PM
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Exclamation Help!!!! backfireing problem

I have a 88 chey blazer k5,, i'm having a problem with it backfireing when i step on the gas and it is also running alittle rough.. i change the spark plug, wires, distributor cap, coil, adjusted the timeing, change the fuel fliter and rotor...... i can't think of anything else to do .... can anyone help.. thank you,
raylene
 
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Old 02-16-2010, 06:13 PM
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What did you set the timing at? Or did you just rotate the distributor on a whim?
 
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Old 02-16-2010, 08:24 PM
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check the timing on the crank or could be needing a valve job
 
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Old 02-17-2010, 08:28 PM
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i did the timing light on it!!!
Originally Posted by bigfdaddy View Post
check the timing on the crank or could be needing a valve job
 
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Old 02-17-2010, 08:37 PM
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I am assuming that you have the TBI 350 here...

To set the base timing on this motor, you must first disconnect the 'set timing' connector (tan/black wire close to the distributor). The engine should be up to normal operating temperature and the A/C set to 'off'. The transmission should be in neutral and the wheels chocked.

Set it to 0* to the #1 cylinder.

The crucial step here is to disconnect the 'set timing' connector.
 
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Old 02-18-2010, 01:37 PM
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yes i set it to 0....

and i try move the distributor
 

Last edited by swartlkk; 02-18-2010 at 01:39 PM. Reason: *Combining Consecutive Posts* - Please use the EDIT feature to include additional information in your post if another member has not replied.
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Old 03-10-2010, 09:10 PM
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check your plug wires and make sure they are on the proper plugs. small blocks will idle quite nicely with the two rear passenger side plug wires swapped but backfire under load .
 
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Old 03-12-2010, 01:05 PM
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I had a similar problem... ended up being a flat cam lobe, so maybe look that direction.
 
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