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'87 5KQT turbo overpressure
Check the braided hose that goes from the intake manifold to a metal
fitting on the wastegate. Not the little one coming off the Wastegate
Freq. valve, the other one, about 3/4" dia. It is ridiculously
expensive from the dealer, the parts guy said to me "I'm embarassed to
tell you this lists for $37.91, so I'll give you a discount." PN 035 145
742 B. I never hit the cutoff (it doesn't sound pleasant), but I was
indicating 1.9 a lot more than I should (Intended Accleration 1.5) and
sure enough the hose was cracked and basically cooked inside from the
heat where it connects to the wastegate. This is probably the easiest
fix, it could also be a siezed wastegate (bad), or ??.
-Matt Martinsen '86 5KTQ
>My newly-aquired 1987 5KQT is consistantly activating the turbo
>overpressure switch (fuel cutoff) when accelerating under part or >full
>throttle conditions. It accelerates very nicely up until it hits the
>overpressure switch and it is possible to accelerate without causing
>to trigger but I must be careful. At an indicated 1.5 bar pressure
>reading from the dash guage it appears to trigger which sounds >normal.
>I can't seem to locate and vac/pressure leaks but it has been cold
>outside and I may not have been as thorough as I should be. Any >clues
>as to where to check first?
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