Question about 1993 GMC Sierra K1500
The following resons given below might be responsible for the misfiring in your sierra K1500;
1.Faulty spark plugs or wires
2.Faulty coil (pack)
3.Faulty oxygen sensor(s)
4.Faulty fuel injector
5.Burned exhaust valve
6.Faulty catalytic converter(s)
7.Stuck/blocked EGR valve / passages
Here is a possible solution to the problem;
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule.
I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.
Posted on Aug 02, 2010
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Jun 27, 2015 | Cars & Trucks
Dec 08, 2011 | 1996 GMC Safari
Oct 02, 2011 | 1992 GMC Sierra K1500
Jan 16, 2010 | 1996 Chevrolet K1500
Oct 27, 2009 | 1993 GMC Sierra K1500
Mar 28, 2009 | 1996 Chevrolet K1500
Aug 28, 2008 | 1998 Chevrolet K1500
Aug 24, 2016 | 1993 GMC Sierra K1500
Feb 19, 2015 | 1993 GMC Sierra K1500
544 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: