hello and welcome !!
you have a real scanner? that can see all PID's (like ECT, closed loopstatus, IAT, LTFT, TPS angle, etc?) not just a code reader?
that surge means (ecu caused) is because the ECU can not hold idle a 800 rpm , so it hunts the ISC valve (air supply) to find 800 and cant.
my guess is the intake system on this engine is leaking air, from MAF to intake valves. (end to end can leak) and go lean.
EGR is missing and has metal plate in place of EGR main?
or the ring plate (steel)inside the frame skeleton, is stuck , if yes this is a stuck closed EGR. (bad)
yes, the cars ECU must have the timing freeze jumper inserted, to set timing (spark)
the jumper is called DLC connector next to right front head light.
that jumping is normal, that is how (just 1) the ECU , makes idle run so good. (perfect mixtures)
you do have 2 problems on the engine, EGR is last, in fact fixing the other with EGR stuck closed, is more easy.
seem you timing belt did not slip, with 2degrees there. if it slips it goes way cam shaft (spark) retarded and rpm drops like a rock. (usually)
here is the results of a full 96 scan
any scan tool can do this, ignore graphs, that is my fancy software doing that , and is not needed.
http://www.fixkick.com/ECU/Authority/A_F..._scan.html
so when scanning does TPS work, match foot actions. (right foot throttle)
does ECT attain 180F hot and hold there.
all others checks hot engine.
MAF reading at idle, ? and what can you get gunning the throttle?
RPM will be wrong, (yours is )
Do you get closed loop status, at idle, (i bet not)
what is LTFT at idle hot (long term fuel trim) -5% (or -8) but not + 40% (its polar readings,)
better tools can see the 02 swing, many times a second.
no my wild guess.
vacuum leaks.
where, that is the question.
IAC stuck open will also cause this.
IAC is thermal, mounted under the throttle body.
300RPM is bad. maybe the EGR is leaking (main valve,) it can be hard to remove, those 2 ,6mm screws. (if off, get the valve to open by hand and snap shut)
even the cheapest $10 scan tool can read a 1996 fully.
??? ideals.
the bogging is bad sign.
Egr stuck open or weak FAM (ecu can only report (DTC) dead maf, not weak)
or very horrid air (vacuum leaks)
http://www.fixkick.com/sensors/EGR/egr-main2.jpg
full 96 egr report
http://www.fixkick.com/EGR-Gen3.html
DLC; jump pin 4 to 5 for freeze (6pin conn, next to R/F head light)
http://www.fixkick.com/IGN_timing/IGN-FREEZE.HTML
if the IAC leaks, we will need to prove that with clay here
http://www.fixkick.com/fresh-air/Slide_S...Body1w.jpg
but you can not run engine with the AIR pipes off like that. (this would make the MAF read 0)
id do full scan first. do get a better handle on what's going on.
for now , get the EGR main closed, 100% .
fix real problems, (bogs tops that list) then attack EGR last.
engine will have full power, like that.
the 96 has rubber main intake pipes behind MAF to engine, are they cracked? and boots.
you have a real scanner? that can see all PID's (like ECT, closed loopstatus, IAT, LTFT, TPS angle, etc?) not just a code reader?
that surge means (ecu caused) is because the ECU can not hold idle a 800 rpm , so it hunts the ISC valve (air supply) to find 800 and cant.
my guess is the intake system on this engine is leaking air, from MAF to intake valves. (end to end can leak) and go lean.
EGR is missing and has metal plate in place of EGR main?
or the ring plate (steel)inside the frame skeleton, is stuck , if yes this is a stuck closed EGR. (bad)
yes, the cars ECU must have the timing freeze jumper inserted, to set timing (spark)
the jumper is called DLC connector next to right front head light.
that jumping is normal, that is how (just 1) the ECU , makes idle run so good. (perfect mixtures)
you do have 2 problems on the engine, EGR is last, in fact fixing the other with EGR stuck closed, is more easy.
seem you timing belt did not slip, with 2degrees there. if it slips it goes way cam shaft (spark) retarded and rpm drops like a rock. (usually)
here is the results of a full 96 scan
any scan tool can do this, ignore graphs, that is my fancy software doing that , and is not needed.
http://www.fixkick.com/ECU/Authority/A_F..._scan.html
so when scanning does TPS work, match foot actions. (right foot throttle)
does ECT attain 180F hot and hold there.
all others checks hot engine.
MAF reading at idle, ? and what can you get gunning the throttle?
RPM will be wrong, (yours is )
Do you get closed loop status, at idle, (i bet not)
what is LTFT at idle hot (long term fuel trim) -5% (or -8) but not + 40% (its polar readings,)
better tools can see the 02 swing, many times a second.
no my wild guess.
vacuum leaks.
where, that is the question.
IAC stuck open will also cause this.
IAC is thermal, mounted under the throttle body.
300RPM is bad. maybe the EGR is leaking (main valve,) it can be hard to remove, those 2 ,6mm screws. (if off, get the valve to open by hand and snap shut)
even the cheapest $10 scan tool can read a 1996 fully.
??? ideals.
the bogging is bad sign.
Egr stuck open or weak FAM (ecu can only report (DTC) dead maf, not weak)
or very horrid air (vacuum leaks)
http://www.fixkick.com/sensors/EGR/egr-main2.jpg
full 96 egr report
http://www.fixkick.com/EGR-Gen3.html
DLC; jump pin 4 to 5 for freeze (6pin conn, next to R/F head light)
http://www.fixkick.com/IGN_timing/IGN-FREEZE.HTML
if the IAC leaks, we will need to prove that with clay here
http://www.fixkick.com/fresh-air/Slide_S...Body1w.jpg
but you can not run engine with the AIR pipes off like that. (this would make the MAF read 0)
id do full scan first. do get a better handle on what's going on.
for now , get the EGR main closed, 100% .
fix real problems, (bogs tops that list) then attack EGR last.
engine will have full power, like that.
the 96 has rubber main intake pipes behind MAF to engine, are they cracked? and boots.
http://www.fixkick.com