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Stalling problem - getting worse 200 1991

posted by  ACVOLVO on  Thu Aug 27 09:24 CST 2015
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last visit: Fri Sep 19 13:15 CST 2014
[RELATED]

Additional things:

Looked for possible vacuum leaks, like hoses and PCV system.
Fuel injectors are only a few years old and they are new Bosch ones. So if this was the issue it would run bad most of the time.
Cleaned connections on connectors, and Fuel ECM, and ignition ECM contacts
Replaced fuel pump relay.
Checked fuse # 4 that goes through the fuel injection relay that turns on ignition system
Replaced spark plug wires, and coil wire
Inspected cap and rotor
Replaced ignition coil
Replaced MAF sensor with a used Bosch one.
Checked Throttle switch adjustment.
Checked fuel pressure 36 psi with vacuum, 46 psi with out vacuum connected.
Checked all connections.
Removed battery ground cable checked for resistance, cleaned both ends and used electrical biting style washer on block.
Did a compression test several months ago was 155 highest , 145 lowest. If I remember right , I have it written down, I know it was not lower than 145 for sure.
No signs of exhaust leaks.
Used CRC connector cleaner than followed up with Pro gold 5.






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