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#1
01-12-2010, 07:53 AM
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2003 sonoma 4.3 ltr PO300 code after tune up
I have a 2003 sonoma, I changed the plugs, wires, rotor, and distributer cap and now it runs rough and is throwing a PO300 code. The cap only goes on one way. Any ideas??
Last edited by bfd1262; 01-12-2010 at 05:44 PM. 
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#2
01-12-2010, 09:37 PM
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Re: 2003 sonoma 4.3 ltr runs rough
P0300 is almost ALWAYS caused by a fault in secondary ignition parts, (plugs, wires, cap & rotor).
Are you sure the cap is wired correctly?  The 4.3 can be very fussy when it comes to ignition parts. AC Delco plugs #41-993 and AC Delco cap, rotor and wires will assure proper performance. Low fuel pressure and or excessive leakdown can cause P0300 also. Have you checked fuel pressure and leakdown?
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