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Calling all d-Junk[er,Jet] Gurus 140-160 1972

posted by  yellowbricktoad on  Wed Apr 28 16:27 CST 2004
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last visit: Sat Mar 23 10:03 CST 2013
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I'm about ready to give up on D-Jet & I've been a professional wrench for 30+ yrs! The problem only asserts itself after heating up, usually after at least 10 mi. The injection drops out 2cyls [#s 2&4]. I have a DVOM that can measure pulse width [which is .79 ms at idle] & duty cycle for the trigger points [which is 49-51% untill it heats up sufficently to start the problem]. Running on 2 cyls in traffic sucks! I've replace the trigger points, substituted a used ecm,isolated the injection from the ignition, isolated both inj. & ign. from the ign. switch,swapped out the pressure sensor,replaced the injectors, cleaned all the grounds, replaced the connectors at the trigger points, replaced the coil [Bosch blue], & swapped out the Pertronix ign. for points. I've tested the pulse width at the injectors & at the ecm terminals & the same for the trigger points. The problem was occaisional untill the warmer weather, now it's a real pain. If I raise the hood it will take longer to occur. Voltage to & from the inj. relay & the fuel pump relay is good. The relays don't seem to be overheated. When the injectors drop out the trigger point duty cycle also goes haywire, fluctuating wildly from 0-99 & anything in between. So... any ideas guys?

Mike M.






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