88 Turbo No Start - Help

[John S]

Had to tow my son's '88 740 Turbo wagon home last week (157k miles) .

Car died at gas station. It ran fine until fill up and then very
rough after fill up. Then no start at all.

Now at home, car cranks and appears to fire, but on release of
starter, it will not continue to run.

The car fires when the starter engages, and sometimes runs (well) for
a few seconds after release of starter, hence problem is probably not
bad gas or ignition.

Also, I jumped the ground on the fuel pump (under driver foot well on
charge air overpressure switch). This caused the fuel pump to run
continuously, but engine still would not run after release of starter.
Hence probably not the fuel pump relay.

So what else? Mass air sensor, computer, ??

Thanks.

John S.

 

[Gary Heston]

Had to tow my son's '88 740 Turbo wagon home last week (157k miles) .

Car died at gas station. It ran fine until fill up and then very
rough after fill up. Then no start at all.

Now at home, car cranks and appears to fire, but on release of
starter, it will not continue to run. [ ... ]
So what else? Mass air sensor, computer, ??

Check all the sensors associated with the fuel injection system. My
145 died recently while driving and exhibited the same symptoms; it
turned out to be a wire that pulled loose from the temperature senson.

I suspect you have a similar loose wire, or with an '88, possibly
biodegradable wiring harness shorting out.


Gary