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Old 05-12-2008, 12:42 PM   #1
The_Hamster
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Join Date: Apr 2002
Posts: 792
Default What a difference full boost makes!

1987 5000TQ

Wasn't making full boost, no codes from computer.

1.1 was all it would ever reach on the MAF screen.

The computer output tests shows the frequency valve and boost solenoid valve were not getting any power. Tracing wires showed the wiring was good to those devices. More reading into the diagram lead me to the fuel pump relay, as it is supposed to put out 12V for these devices through the computer.

The relay was not putting out the 12v. Opened the relay up to find a broken tract on the circuit board. Soldered in a 10amp fuse to repair the tract and voila, devices now all work.

1.4Bar is now the highest I can get the MAF to go. Sure does push your butt harder than 1.1Bar, and sooner. Car is a joy to drive now. Looking into upping the boost further with one of the chips.
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Old 05-12-2008, 12:42 PM
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