Question about GMC Sierra 2500
Engine Cranks But Will Not Start
A. Test Fuses. Test both under hood power distribution center and the fuse panel under dash. This is done with a test light tool. The test light should illuminate on both sides of the fuse, if not the fuse has failed and needs to be replaced.
B. Testing Fuel Pressure Test for proper fuel pressure with a test gauge on the fuel rail, most throttle body injection cars (TBI) are between 13 psi and 17 psi. and most (DPI) direct port inject systems are between 40 psi and 55 psi. If no or little fuel pressure is observed and there is 12 volt power present the fuel pump, the fuel pump needs replacing.
C. Checking Timing Belt Test for compression by removing a spark plug and insert a compression gauge. Crank the engine over about 5 seconds the gauge should read between 125 psi and 165 psi, if no compression is observed remove front engine cover to inspect timing belt or chain. Crank engine to observe cam rotation, if the cam does not rotate the timing belt or chain has failed. (note: if the timing belt drives the water pump it is best to replace the water pump at this time)
D. Test for Injector Pulse Remove injector connector to insert injector test light (node) or volt meter. Observe light flash or gauge pulse while cranking. If light/voltmeter doesn't respond, an ignition distributor/crank angle sensor (CKS) or an ignition module is most likely your problem.
E. Test for Ignition Spark Remove spark plug wire, insert an extra spark plug into end of wire, rest spark plug next to a ground source then crank engine. You should observe a blue spark between the spark plug gap and ground source. If no spark is observed, an ignition coil, ignition rotor or spark plug wires might have failed. (always keep hands away from engine when cranking)
The ENGINE CROSS-SECTION below (typical 'V-8' ENGINE) shows all main ENGINE components and indicates the exact location of the most HEAT DAMAGE PRONE PARTS - THE HEAD GASKETS.
Posted on Jul 18, 2008
a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Apr 14, 2011 | 1995 Jeep Grand Cherokee
Apr 01, 2011 | GMC Suburban Cars & Trucks
Nov 02, 2010 | 1998 Ford Explorer
Sep 02, 2010 | GMC Sierra 1500 Cars & Trucks
Feb 06, 2010 | 1998 GMC Sonoma
Nov 07, 2009 | Pontiac Trans Sport Cars & Trucks
Sep 14, 2009 | 1994 Mitsubishi Mighty Max
Apr 10, 2009 | 1994 Chevrolet Cavalier
Mar 01, 2009 | Chevrolet S 10 Cars & Trucks
Oct 18, 2008 | 1995 Jeep Grand Cherokee
Mar 27, 2017 | 2004 GMC Yukon
632 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: