03-25-2018, 12:53 AM
most mono port EGR years. late 95 to 98.
the mono port in the intake manifold it 100% plugged up, and the stall test fails. hard.
there 4 systems to fail here.
1: exhaust path
2: vacuum path
3: electric path to ECU and Vsv.
4: cat missing makes the modulator dead.
each can be tested. i do the stall test and bark test. first. most times you go in the correct direction, to the actual cause.
if the bark test passes, then I make sure the vacuum side is working. using vacuum gauge and handpump (all in on tool)
the mono port in the intake manifold it 100% plugged up, and the stall test fails. hard.
there 4 systems to fail here.
1: exhaust path
2: vacuum path
3: electric path to ECU and Vsv.
4: cat missing makes the modulator dead.
each can be tested. i do the stall test and bark test. first. most times you go in the correct direction, to the actual cause.
if the bark test passes, then I make sure the vacuum side is working. using vacuum gauge and handpump (all in on tool)
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