A little brain twister for you all.....

[Beatty, Robert]

Hi all,

A few months back, I had posted about a stumbling problem at high boost.
Well, finally figured it out and I figured i could see who can figure this
out on their own :).

Car:  87 5ktq with SMJ Autotechnic ecu mod.


Symptoms


Stumbling at high boost (3800 rpm & up)  (boost either 1.2-1.4 or 1.7-1.8)

No codes when checked


Have replaced the following


sparkplugs (correct W7 plugs for 5ktq)

replaced or verified plugs wires are correct resistance

replaced all breather hoses

checked and replaced where needed all vacuum lines

changed fuel filter

switched ECU's no change in problem

have NOT checked fuel pressure, but thats not the problem

head gasket and em was replaced along with timing belt ect ect in July.
Problem was there BEFORE and is still there now.

WGFV and WG working correctly


Have at it :)

Rob