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The most common chain of events that kills a 240 w/ C.I.S.

posted by  someone claiming to be George Swift on  Mon Jun 15 09:17 CST 1998 [RELATED]

ICQ>


This chain of events can be avoided, but I've seen it a zillion times. I've seen it many many times in my short time on the Brickboard. If you service or own a 240 with C.I.S. injection (K jetronic), Consider this chain of events.

1 : The fuel pump draws too much current because of wear, age, or repeatedly rin low on fuel. Water in the gas, or plugged filter too.

2 : The fuel pump relay o'heats, due to higher amperage draw, and causes numerous problems. The problems can include all of the following.

* Melt-down @ relay connector, Causing intermittant no-starts or quitting.

* Frys ECU for ign., either Bosch or Chrysler.

* Blows fuse # 7 repeteatedly. * Frys fuel pump relays/connector. * Causes intermittant fuel pump relay related faults. (no power to lambda relay, no power to CPR, Shorts ignition, no power to IAC, or AAR.

All because a worn fuel pump Draws more current than the relay can handle. I recommend that the fuel pump relay be checked after any Ign. failures or any other related failures. An amperage draw test of the fuel pump is good preventative maintenance. Remember that the fuel pump relay gets powered up or ''excited'' by a tach signal. That's how a shorted relay can fry an ICU.






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