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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   Drive Shaft Repair I have a 2015 Chevy Traverse AWD. The fr...   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...

Search Auto Parts Search 99 4.3 vortech need a little advice Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Car Troubleshooting precision New User May 7, 2008, 2:42 PM Post #1 of 4 (2331 views) 99 4.3 vortech need a little advice Sign In I swapped old wore out 4.3 in 2000 astro with a 1999 4.3 with 21k on it thats been setting in my shop for 7 years. Everything turned out good. But there is no fuel getting to the cylinders through the nozzles. Could the fuel that sat all that time in the solenoid pump and injection lines be the problem? And could it be cleared out without dismanteling the plastic plenim and pulling the pump and injectors? (This post was edited by precision on May 7, 2008, 3:26 PM) Double J Veteran / Moderator May 7, 2008, 6:41 PM Post #2 of 4 (2322 views) Re: 99 4.3 vortech need a little advice Sign In Deposits build up on the poppet valve ball and/or seat and cause the poppet ball to stick closed. This is a common problem with this style injector. GM had issued bulletins about this with a correction to perform a special high pressure unsticking and cleaning process that usually restored the poppet valves to "as new " condition. Special equipment is needed to perform their procedure. You can try a fuel injection cleaning process to see if it works. But if these have sat idle for 7 years,IMO,I would replace them. Jim precision New User May 7, 2008, 8:04 PM Post #3 of 4 (2318 views) Re: 99 4.3 vortech need a little advice Sign In Thanks Jim for the info thats what I needed to know. You were very helpful. Barry DanD Veteran / Moderator May 8, 2008, 4:39 AM Post #4 of 4 (2312 views) Re: 99 4.3 vortech need a little advice Sign In I agree Jim. Even if he gets the poppets to start opening; he’ll likely end up with them leaking or sticking intermittently again. He may have the option of changing this system from Central Sequential Port Injection (poppet style) to a true multi-port sequential injection. On some applications GM brought out this retro-fit, doing away with the poppet valves and putting injectors in their place. It’s a direct fit, remove the central injector and poppet valve assembly and stick in the replacement injectors; no modifications, plug it in and you’re done. One of the benefits of this system is if the fuel pump cannot build its full 60psi but let’s say only 50psi, the vehicle will still start and run normally; where the original system wouldn’t even begin to fire. Poppet nozzles are opened hydraulically but the injectors are opened electrically not relying on full fuel pressure. What 4.3 wont run on 50psi as long as the volume is still there? The only draw back is that the retro-fit is a little better then a 100 bucks more to buy. Well worth it for some of the people; around here (farmers for example) that are using higher content ethanol fuels. Ethanol and the earlier poppet style systems didn’t get along to well; it was like pouring crazy glue into the fuel tank. The ethanol would actually eat the finish off the nozzle’s ball valve and seat. If you’re interested in the “new” revised system call your local GM dealer and they should be able to tell you whether it’s available for your 4.3? Dan. Canadian "EH"   Email This Post   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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