Solution to the brain twister (5ktq stumbling problem)

[Beatty, Robert]

little brain twister for you all.....
> 
> 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
> 


While replacing my clutch last week, Dad was lining up the engine and tranny
to slide them together.  As he turned the flywheel to assist in this, he
noticed a broken tooth on the starter ring gear!  That is the nasty little
gremlin that is causing my car to stumble.  The ECU counts the number of
teeth on the fly wheel and makes adjustments in timing and other conditions
based on that count.  SOOO thats why I have a stumbling problem.
Unfortunately I now have to pull the whole tranny out AGAIN to replace as i
didnt have access to a ringgear that day :(

If anyone has a ringgear for 5ktq (MC eng) please get back to me.

Rob