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GL 740 B230F 1989- no start 700 1989

posted by  volvosenior on  Fri Jun 29 12:52 CST 2007
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last visit: Tue Oct 21 21:49 CST 2014
[RELATED]

I'm really stumped with this no start problem.
Everything checks out- the RSR is good- (a new one at least), the RPM sensor works, no vacuum leaks, timing is on as per the timing belt replacement procedure, the AMM is working, IAC and power stage are good- I only have a multimeter, but I checked everthing for ground and continuity and it all seems okay.

The injectors show infinite resistance, when they should show 16 ohms according to the spec book- but they squirt fuel into the cylinder. So the Fuel pump relay works.. it makes a good healthy sound when the key is turned on. When I disconnect the fuel line fuel squirts out all over!


I'm wondering if the ECU has gone kaput? the Bosch # is 0280000556
When I try to bring up the OBD is shows everything as working- in mode one, but can't get any readings in mode two or three-

the engine gets fuel and has a healthy spark =it just won't fire- it backfires and coughs. otherwise it just cranks with no intention of firing- plugs are new
and I changed the copil too..

any good mechanics out there with some fixit solutions?






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