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Vans & Minivans GMC Safari & Chevy Astro GMC Safari/Chevy Astro Starting/Stalling/Idling Problems
155 messages, Last post on Dec 01, 2009 at 12:48 PM
You are in the GMC Safari & Chevy Astro Forum. Your Host is Karens
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Replying to: atlhotboy (Dec 28, 2007 7:38 pm) |
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Replying to: marek416 (Dec 06, 2006 12:48 am) mine just did the sme thing.
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Replying to: jkowmr (Feb 24, 2008 12:18 pm) Let me know how thing go with you, can you confirm it always starts when the bloc heater is plugged in. Cheers. M |
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My 95 GMC Safari (4.3 L Vortec) has had fuel system issues for approx 10,000 miles now and has ~ 215K miles on it. I recently replaced the rotary fuel pump (OEM) with the new Bosch turbine pump and have had great success with it. After filling the vehicle with gas I made it about 3 blocks before the engine cut out. Checked fuel pressure at the rail and found it to be in spec ~ 61psi ignition on. I checked for spark and traced it all the way down to the ind. wire for each plug and have good spark. The most obvious answer is bad fuel at this point, but I took a sample and found water but not very much. Any ideas as to why it wont even kick over? Thanks P.S., try the new Bosch turbine pump if your are sick of replacing your fuel pump every 10 K miles, it eliminates the ethanol sensitive pulsator valve and comes with a life time waranty! |
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Replying to: marek416 (Dec 06, 2006 12:48 am) thanks
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Replying to: pwr2020 (Mar 05, 2008 11:47 am)
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Replying to: dakota4x4 (Mar 05, 2008 7:32 pm) Pull a plug, re-connect it to its wire and set the base of the electrode on the head. Cranked engine over and found that spark is strong, blue in color and fires correctly with timing. However, if you crank the engine over with your foot on the throttle (all plugs installed) and then pull a plug it comes out dry with no discoloration or ceramic deposits, why am i not getting Combustion sufficient to fire engine? From what I understand of the injection system (CMFI), the individual injectors are supplied fuel by the main injector. Instead of having individual electronically actuated injectors, each jug receives fuel from a hose that supplies during vacuum seen in the head (non-electronic). The only issue I can see now is that although the fuel rail has good pressure, the main injector is not opening and therefore fuel is not being delivered to the ind cylinders. Is the main injector electronically actuated which would be a failure mode here, by not allowing fuel into the combustion chamber via its vacuum actuated ind. injectors? I would think that even bad gasoline (with water in it) should still dampen a plug when you pull it if it does not combust and I am getting dry plugs. (CMFI) Main Injector (electronic/vacuum?) No fuel being delivered Inj 1 Inj 2 Inj 3 Inj 4 Inj 5 Inj 6 Vacuum Vacuum Vacuum Vacuum Vacuum Vacuum Does this make sense? Thanks for the help!
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Replying to: pwr2020 (Mar 06, 2008 8:14 am)
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Replying to: dakota4x4 (Mar 06, 2008 7:18 pm) Thanks for the help, I will replace cap and rotor and let everyone know if that solves the problem!
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| 95 Astro runs good most of the time, except when in heavy traffic or climb. If I suddenly stop or even slow down in traffic, upon re-acceleration the van acts as if it is either flooding or starving for fuel. I have found a temporary remedy for it. If I turn engine off and back on it continues as if nothing happened. Please help!!! Its not fun stopping in heavy traffic to re-start a sick automobile. | |
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