| P1PER |
Wed Feb 10, 2010 5:15 pm |
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78 Campmobile 2.0 stock fuel injection hydraulic lifters Pertronix igniter. Well I don’t post here that much but I find this site very helpful. I came across a problem recently that had me stumped. I figured it out and I want to post it here so everyone else can share it.
My bus ran very well until one day while I was warming it up it stalled (like someone flipped a switch) and I could not restart it. I pulled a plug to check for spark and the plug was wet with gas = flooded. Let it sit over night, started it the next day ran for a while, same thing. So I started troubleshooting with info from The Bentley, Ratwell and here. Very long story short this is some of what I checked in no particular order.
Timing: 7.5 before TDC
Dwell: 49
Coil per Bentley: good
Cap and rotor: good
spark at plug: good
all rubber vacuum hoses: ok but I replaced them anyways
intake air sensor at the ECU plug per Bentley: good
temp sensor II per Ratwell: ok but I replaced it anyways
AAR: ok, replaced the rubber hose
CSV per Bentley: good
replaced injector seals
replaced the oil in the crank case at least 3 times while testing (gas in oil
Fuel presser: this is where it gets interesting. While running it is just as it should be per Bentley, if you turn off the ignition before it stalls it has good fuel pressure retention BUT if you let it stall it had no fuel pressure retention. I couldn't find any thing on this here or on Ratwell and I had only hunted and pecked thru The Bentley so I decided read the fuel injection section front to back. That is where I found this on page 19 and 20. “flooding, which may prevent the engine from starting is probably caused by a faulty injector. The trouble may intermittent, becoming a major problem in damp whether. Test each of the injection system’s 4 injectors in order to determine whether the winding of any injector is grounded to the injector case. If one injector winding is grounded, owing to a brake down of the insulation inside the injector, it will also ground the windings of the other injectors with the control unit. As a result all four injectors will open and discharge fuel continually for as long as the ignition is turned on.” I tested it as the book described but I found no bad injector because as soon as you unplug the injector the spring inside it will close it and brake the “grounded winding” situation. How I fond the bad injector and confirmed this to be the problem is I ran the bus till it stalled with the air filter off, leaving the ignition on I pushed the air intake sensor flap to run the fuel pump for a second and I had no fuel pressure retention. Disconnected the plug on one injector and pushed the flap again and no retention. Reconnected that injector and disconnected an other repeat, no retention. Third try I had retention, found it! So I replaced all the injectors and it runs grate again. Hope this helps someone. |
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| Amskeptic |
Wed Feb 10, 2010 11:29 pm |
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P1PER wrote: Third try I had retention, found it! So I replaced all the injectors and it runs grate again. Hope this helps someone.
Thanks for the follow-through. That was a helpful post.
Colin |
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