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GMC Sierra problems Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Truck Repair>> Truck Engine Repair waiblicious21 New User Oct 19, 2010, 8:39 PM Post #1 of 3 (3700 views) GMC Sierra problems Sign In I have a 1991 GMC Sierra SLE its a k2500 with a 5.7 liter engine it has a/c and is a 4x4. it has 200,00 miles. As of now the truck starts up immediately upon turning the ignition. it idles really rough and spews out black smoke. if I pull the injector plug or the ecm fuse the truck runs perfectly until the fuel line empties. I just changed fuel pressure regulator the throttle position sensor, knock sensor, plugs, distributor cap and rotor and all plug wires. I'm lost. HELP.......................... Sidom Veteran / Moderator Oct 19, 2010, 9:09 PM Post #2 of 3 (3698 views) Re: GMC Sierra problems Sign In I think it would be good to start with some basics. Pull the codes and see if any codes are there, you may have to run it and check before shutting it all the way off. A fuel pressure reading would be good and also how long the pressure holds. It would be real helpful if you could look at the comp datastream and see what some reading are, the coolant temp in particular......... Tom Greenleaf Ultimate Carjunky / Moderator Oct 20, 2010, 6:59 AM Post #3 of 3 (3692 views) Re: GMC Sierra problems Sign In I'd do exactly what Sidom suggested and and just add that the CTS (coolant temp sensor) is suspect. Check the plug to it and if you replace that get one with a pig tail wire to solder in properly. It should have a yellow wire and another I forget right now near the thermostat like a spark plug they just screw in, T   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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