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1995 K1500 Running Rough at Half Throttle Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) 1 2  View All Auto Repair Home>> Automotive Repair>> Car Troubleshooting MarineGrunt Enthusiast Sep 27, 2014, 6:21 AM Post #26 of 28 (1286 views) Re: 1995 K1500 Running Rough at Half Throttle Sign In It ended up being the valve. Truck seems to be running great. This was the first time I've ever had to mess with the egr system on any vehicle and you guys made it all easy to understand. I really appreciate all of the help! Discretesignals Ultimate Carjunky / Moderator Sep 27, 2014, 6:53 AM Post #27 of 28 (1285 views) Re: 1995 K1500 Running Rough at Half Throttle Sign In It was pretty common on those valves for the spring inside to get worn out and change the way the valve opens. Seen that happen a lot on the Buick Roadmasters. You could duplicate by brake torquing the engine with light throttle. If the engine surged, usually the EGR valve was the culprit. As for the delayed starting, cycle the key from on to off a few times before starting the engine. This primes the fuel system. If it starts up just fine after priming a few times, you might have a fuel pressure drain back problem. Connect a fuel pressure gauge and look for pressure bleed off after the pump turns off. If it does, you either have a bad check valve in the fuel pump, which is very common, or a leaking fuel pressure regulator. If the injectors were leaking, I'm sure you would have seen that by now. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved. (This post was edited by Discretesignals on Sep 27, 2014, 6:57 AM) Hammer Time Ultimate Carjunky / Moderator Sep 27, 2014, 8:19 AM Post #28 of 28 (1280 views) Re: 1995 K1500 Running Rough at Half Throttle Sign In AMAZING........... we solved one of MG's problems in only one page........................LOL I hope this post doesn't start a second page now....LOL ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. 1 2  View All   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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