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[JLX 1993]

Originally Posted by jtgh

full tune up. (cap ,rotor,wires, plugs) and fuel filter. ( dizzy is not bad , im sure)

disconnect MAF and try to see if the ECU mimic mode of a missing MAF helps. I disconnected, and no difference.. (what do I look for? I'm still learning)

does it bog hot and cold motor ( top test )
Yes it does, cold, warm, hot

cracked exhaust manifold can cause gross lean OR gross rich. (pull top shield and look)
depends on how much carbon lays down on top of 02 sensor element.
unplug O2 sensor connector and drive it.
It this besides the exhaust manifold? will check this evening

this forces EFI out of attempt of closed loop and car now runs strickly off MAF hot.
this is the Intrinsic AFR of your motor.
in this mode out of factor car is a tiny bit rich ( if not you have 2 problems)
the normal EFI always subtracts fuel. ( that is the goal) on average.


as per previous post. timing. IGN !

if timing is way off, over 2deg. do not set it. (need freeze timing jumper to set it ,ask) specialty tool? have only basics, no fancy tools here
this is proof positive that the Timing belt has slipped. ( damage will happen if it slips more)
I don't have a lot of choice for mechanic, etc... will be big $$ (if they have manuals, etc on hand)

id never drive any 16v that bogged,until
i validated:
1 timing belt , cam timing . (cam belt cover removed ,eye balls on marks)
belt inspection (frayed?)
2: tightened crank pulley center bolt to 94ft/lbs( TSB revision!!!) and determined setting actual as it did it. (i use beam torque wrench for that) where was mine.
10 ft/lbs ( panic)
50 ? kinda stock so ok add TSB rule.
94 ? your last mech reads TSB's he is Hero.
step 3: then set igntion timing last .

that is my proc. , it is to save a good viable motor from destruction.

that is, pistons hitting valves, bye bye head, pistions, rod bearings and worse.

Will try the basics first... order filters, cap, rotor. Not alot of mechanic expertise up here. Not sure if I can have proper test to check timing, but can order parts like rotor, etc... disconnected MAF; what do I look for? no difference in power. Will try the 02 disconnect. Thanks again