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1995 K1500 Running Rough at Half Throttle
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MarineGrunt
Enthusiast
Sep 27, 2014, 6:21 AM
Post #26 of 28
(1300 views)
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Re: 1995 K1500 Running Rough at Half Throttle
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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!
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Discretesignals
Ultimate Carjunky
/ Moderator
Sep 27, 2014, 6:53 AM
Post #27 of 28
(1299 views)
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Re: 1995 K1500 Running Rough at Half Throttle
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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)
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 27, 2014, 8:19 AM
Post #28 of 28
(1294 views)
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Re: 1995 K1500 Running Rough at Half Throttle
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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
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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.
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