Question about GMC Sierra
You can google the engine size and "firing order" to get a drawing or photo of the firing order online.
Example - - 1990 GMC 350 firing order diagram
Posted on Dec 19, 2012
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Posted on Jan 02, 2017
Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps
Posted on Mar 05, 2010
SOURCE: No spark?
Hi, common thing with the mazda was the coil or the ignition amplifier going faulty, both of which are located within the distributor, the coil ususally gives the symptoms you describe, a weak spark. The coil is the most common failure aswell for your vehicle i would recommend a new one, also make sure distributor is spinning as it could just be a case of a broken timing belt.
Good luck Davelee
Posted on Apr 29, 2009
I reccommend putting WD40 or CRC on the connections to stop them corroding over time. You also want to make sure the Distributor Cap gasket seals well to keep out water. last make sure you don't get the leads mixed up, best to replace them one at a time. cheers
Posted on May 17, 2009
check your valve lash and compression.You can get a cheap compression tester at auto zone.Any thing under 100 psi or a difference of over 30 psi between two cylinders suggests worn parts or improper valve lash.
Posted on Jan 11, 2010
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