ECU codes

[Freaky Beanie]

Hi,
First post here
I have an 89 sidekick convertible.
I bought this truck in pieces and built it from the ground up. The engine runs and starts fine but idles at 3000rpm for 30 to 45 seconds and then the idle surges from 2300ish to 2500ish rpm.
At 2500 Rpm the timing is at 18.
Compression shows 150 +/- 5 across. (new rings and cylinder was honed)
Vacuum lines are installed correctly.
MAP sensor was replaced (nothing changed)
Plugs are new AC Delco gapped at spec
Check engine light is not on
But in test mode (in fuse box) code blinks 2 then 2 pause then code 1 then 2 =12 (everything fine) and repeats code 12 but i don't see 22 again.
Code 22 is TPS voltage low (could this be my issue?)

Thanks
Steven Richard

[fixkick]

welcome, and you are in Sidekick (vitara) heaven. 3x
I bet you , like to offroad and or have lots of snow, in winter. ?

Hi,
First post here
I have an 89 sidekick convertible.
I bought this truck in pieces and built it from the ground up. (see my 89 differences page)?
http://www.fixkick.com/specs/89-diffs.html

The engine runs and starts fine but idles at 3000rpm for 30 to 45 seconds and then the idle surges from 2300ish to 2500ish rpm.
the surge is the ECU hunting for 800 RPM hot. ISC is a servo device...(a loop)
The dash pot must retract, and no vacuum leaks. all air (vacuum leaks) cause racing idle on all TBI.

At 2500 Rpm the timing is at 18.
simply said rule1 is failing, bad idle.

Compression shows 150 +/- 5 across. (new rings and cylinder was honed)
Vacuum lines are installed correctly.
MAP sensor was replaced (nothing changed) almost never fails but , hose fail, and clog and do the nipples ,end to end.
Plugs are new AC Delco gapped at spec .028"
Check engine light is not on (my guess sometimes yes and no ) due to below.
But in test mode (in fuse box) code blinks 2 then 2 pause then code 1 then 2 =12 (everything fine) and repeats code 12 but i don't see 22 again.
Code 22 is TPS voltage low (could this be my issue?)
22 means TPS calibration is wrong, most are in 89 as its a pain to set.

Thanks
Steven Richard

the fast idle is first. all else 2nd.
throttle cables (up to 3) all have 10mm slack? TV, 3speed kickdown, or cruise cables all same.
TV the under side gunk'ed up. blocking open the TV?
is engine still 89. that is the Throttle body ISC valve has 2 naked wires? (no built in connector on ISC as 91+ have)
vacuum leaks..
ISC stuck open (2wire sensor)
IAC stuck open (or water hose to it blocked, end to end)
Dash pot stuck open. (VSV to it failing)
then lots more harder to find air leaks, I can help.
idle switch failing. (just kills idle regulation, not screaming RPM.
the TB , has gasket that can crack and suck air.(mid body gasket)

the more hard part is testing IAC,
ISC can be tested with a blocking gasket. (take it off, make a sold gasket and no air can suck now)

or as some have, just someone, turn the idle stop screw 10 times CW. and TV is jammed open...

The TV stop screw is for IDLE duty cycle setting. (to 50%) 89-90 only.

cheers to you !

[Freaky Beanie]

[/color]thanks for the prompt reply. I will start with checking the throttle cable tonight or tomorrow

welcome, and you are in Sidekick (vitara) heaven. 3x
I bet you , like to offroad and or have lots of snow, in winter. ?
yes here in Canada we usually have quite a bit of snow. I like backroads but that will be for my 1994 Suzuki Sidekick.

Hi,
First post here
I have an 89 sidekick convertible.
I bought this truck in pieces and built it from the ground up. [color=#FF0000](see my 89 differences page)?
http://www.fixkick.com/specs/89-diffs.html

The engine runs and starts fine but idles at 3000rpm for 30 to 45 seconds and then the idle surges from 2300ish to 2500ish rpm.
the surge is the ECU hunting for 800 RPM hot. ISC is a servo device...(a loop)
The dash pot must retract, and no vacuum leaks. all air (vacuum leaks) cause racing idle on all TBI.

At 2500 Rpm the timing is at 18. (the distributor flyweights are flying out now, there is no way to stop that. except find and fix that gross air leak.)
simply said rule1 is failing, bad idle.

Compression shows 150 +/- 5 across. (new rings and cylinder was honed)
Vacuum lines are installed correctly.
MAP sensor was replaced (nothing changed) almost never fails but , hose fail, and clog and do the nipples ,end to end.
Plugs are new AC Delco gapped at spec .028"
Check engine light is not on (my guess sometimes yes and no ) due to below.
But in test mode (in fuse box) code blinks 2 then 2 pause then code 1 then 2 =12 (everything fine) and repeats code 12 but i don't see 22 again.
Code 22 is TPS voltage low (could this be my issue?)
22 means TPS calibration is wrong, most are in 89 as its a pain to set.

Thanks
Steven Richard

the fast idle is first. all else 2nd.
throttle cables (up to 3) all have 10mm slack? TV, 3speed kickdown, or cruise cables all same.
TV the under side gunk'ed up. blocking open the TV?
is engine still 89. that is the Throttle body ISC valve has 2 naked wires? (no built in connector on ISC as 91+ have)
vacuum leaks..
ISC stuck open (2wire sensor)
IAC stuck open (or water hose to it blocked, end to end)
Dash pot stuck open. (VSV to it failing)
then lots more harder to find air leaks, I can help.
idle switch failing. (just kills idle regulation, not screaming RPM.
the TB , has gasket that can crack and suck air.(mid body gasket)

the more hard part is testing IAC,
ISC can be tested with a blocking gasket. (take it off, make a sold gasket and no air can suck now)

or as some have, just someone, turn the idle stop screw 10 times CW. and TV is jammed open...

The TV stop screw is for IDLE duty cycle setting. (to 50%) 89-90 only.

cheers to you !

[Freaky Beanie]

[/color]thanks for the prompt reply. I will start with checking the throttle cable tonight or tomorrow

welcome, and you are in Sidekick (vitara) heaven. 3x
I bet you , like to offroad and or have lots of snow, in winter. ?
yes here in Canada we usually have quite a bit of snow. I like backroads but that will be for my 1994 Suzuki Sidekick.

Hi,
First post here
I have an 89 sidekick convertible.
I bought this truck in pieces and built it from the ground up. [color=#FF0000](see my 89 differences page)?
http://www.fixkick.com/specs/89-diffs.html

The engine runs and starts fine but idles at 3000rpm for 30 to 45 seconds and then the idle surges from 2300ish to 2500ish rpm.
the surge is the ECU hunting for 800 RPM hot. ISC is a servo device...(a loop)
The dash pot must retract, and no vacuum leaks. all air (vacuum leaks) cause racing idle on all TBI.

At 2500 Rpm the timing is at 18. (the distributor flyweights are flying out now, there is no way to stop that. except find and fix that gross air leak.)
simply said rule1 is failing, bad idle.

Compression shows 150 +/- 5 across. (new rings and cylinder was honed)
Vacuum lines are installed correctly.
MAP sensor was replaced (nothing changed) almost never fails but , hose fail, and clog and do the nipples ,end to end.
Plugs are new AC Delco gapped at spec .028"
Check engine light is not on (my guess sometimes yes and no ) due to below.
But in test mode (in fuse box) code blinks 2 then 2 pause then code 1 then 2 =12 (everything fine) and repeats code 12 but i don't see 22 again.
Code 22 is TPS voltage low (could this be my issue?)
22 means TPS calibration is wrong, most are in 89 as its a pain to set.

Thanks
Steven Richard

the fast idle is first. all else 2nd.
throttle cables (up to 3) all have 10mm slack? TV, 3speed kickdown, or cruise cables all same.
TV the under side gunk'ed up. blocking open the TV?
is engine still 89. that is the Throttle body ISC valve has 2 naked wires? (no built in connector on ISC as 91+ have)
vacuum leaks..
ISC stuck open (2wire sensor)
IAC stuck open (or water hose to it blocked, end to end)
Dash pot stuck open. (VSV to it failing)
then lots more harder to find air leaks, I can help.
idle switch failing. (just kills idle regulation, not screaming RPM.
the TB , has gasket that can crack and suck air.(mid body gasket)

the more hard part is testing IAC,
ISC can be tested with a blocking gasket. (take it off, make a sold gasket and no air can suck now)

or as some have, just someone, turn the idle stop screw 10 times CW. and TV is jammed open...

The TV stop screw is for IDLE duty cycle setting. (to 50%) 89-90 only.

cheers to you !

---

Ok I have blocked ISC. And while I was at it cleaned my PCV valve
Throttle cable has enough slack(I would say 10 ish mm)
Started her up (cold idle was no longer at 3000rpm but at 2500rpm and after warm up surging was 1500 to 1000.so Blocking the ISC lowered the idle.
I used propane to try to identify vacuum leak (no change in engine rotation) covering the intake brings it to a stall quite fast without sounds of air entering anywhere else than the intake.
I'll keep at it tomorrow as I have a weekend off (finally lol)
Ohh and great thanks for the help. I really appreciate it

[fixkick]

Ok I have blocked ISC. And while I was at it cleaned my PCV valve
Throttle cable has enough slack(I would say 10 ish mm) Just seeing slack there, you now TV is closed ,up, well, if stop screw not cranked way in.



Started her up (cold idle was no longer at 3000rpm but at 2500rpm and after warm up surging was 1500 to 1000.
so Blocking the ISC lowered the idle. (how much?) what RPM, just approx?

I used propane to try to identify vacuum leak (no change in engine rotation) covering the intake brings it to a stall quite fast without sounds of air

entering anywhere else than the intake.
I'll keep at it tomorrow as I have a weekend off (finally lol)
Ohh and great thanks for the help. I really appreciate it,


pinch hoses, to find it, the brake booster hose, booster leaking, , off the hose and block it at intake side
pinch all hoses, but the MAP, (inspect it)
then block the thermal IAC>
the screws here triad cover.
will probably snap off.
http://www.fixkick.com/IDLE-AIR/Slide_Sh...age_9.html

but here.
this is 91, and one hole there on yours, is missing the bleed air , hole,
but the the IAC air sucking hole you can block with clay.
first make sure both IAC hoses are hot, 180F hot. if not the water path is blocked to iAC (or its packed h2o path).
but if the water flows, then block this air port
http://www.fixkick.com/IDLE-AIR/Slide_Sh...ge_14.html

it is sucking air, and you will find it..

[Freaky Beanie]

This was before I blocked the ISC so it dropped by 500rpm https://youtu.be/ZKvbdXmdkB8

[fixkick]

This was before I blocked the ISC so it dropped by 500rpm https://youtu.be/ZKvbdXmdkB8

im confused.
the video was before the block
ok the ISC blocked and is 500
so ISC is stuck open
is coil still 6 ohms?
Isc if common failure , or bad gaskets (cut wrong, not two holes but a huge wrong ellipse?)
or the valve is just stuck inside clean it?
its leaking , why is the only wonder....

here is a posters work
see wrong gasket, then correct?

http://www.fixkick.com/IDLE-AIR/1989-90/...age_1.html

[Freaky Beanie]

Ok problem resolved. Someone posted on my youtube video that same thing happened after replacing his O ring on the distributor without marking the distributor location before. He asked for help. That helped me. I moved my distributor by one gear notch and voilà problem gone. I still have a higher idle at 1200 RPM but the surging is gone.
Now for the fine tuning I'm going to get my air box in place and look at the higher idle.
I had closed off the ISC valve with tape for testing. I have since removed the tape and re-installed. My ISC does click but idle is not affected by a power load (headlight or blower fan)

Sorry for the confusion.
Thanks

This was before I blocked the ISC so it dropped by 500rpm https://youtu.be/ZKvbdXmdkB8

im confused.
the video was before the block
ok the ISC blocked and is 500
so ISC is stuck open
is coil still 6 ohms?
Isc if common failure , or bad gaskets (cut wrong, not two holes but a huge wrong ellipse?)
or the valve is just stuck inside clean it?
its leaking , why is the only wonder....

here is a posters work
see wrong gasket, then correct?

http://www.fixkick.com/IDLE-AIR/1989-90/...age_1.html

[fixkick]

yes, spark timing set way advancd, is a problem, with too fast idle (in this case small part)
the surging, is the ECU hunting 800 rpm, it does that on all early, ECU, Not today, its very illegal. this bad act. surging.
the only other cause of surging is gross lean AFR, I'm sure you dont have that. if MAP is working.
but its the chicken and egg deal, (spark/RPM) all engines race if advanced too far. (and causes ISC to lose control )

yes, spark must be set , but if RPM is super high, the mechanical advancing weights in the DIZZY base will fly out and make setting it impossible.
800 is spec, RPM for spark setting,
Then , use a timing light (engines not static timed at assembly correctly) I crank engine sparks out.
and use timing light on a dead engine, set spark near 5deg, or so,. BTDC. (bingo, its set, static timed)

then start engine, and fix the air leaks.
you cant set exacting timing on any engine racing.... like that, and leaks.
but can with spark wires removed, cranking, (close but not perfect)

sorry you car don't have timing "freeze jumper" that is 91+ when ECU does all spark and timing advance.
full spec, timing, dizzy, even FSM pages, there,

http://www.fixkick.com/IGN_timing/89-timing.html

clean ISC
new gasket if other is cut wrong, or leaking, it needs 2 holes, not slots. for the air path.
coil 6 ohms.
can be tested with 12vdc battery, 1second on, rest it for 15sec, repeat, dont power it to 12vdc for long it will get hot.

---

btw the 500 is normal, if the iSC is closed.(or gasket blocked)
all G16s do that, (approx)
2500 is , 2000 rpm worth of air leaks (to the plenum)
the ISC is bad, in some way... you proved it.

here is the scope view
if the signal sticks to 12v full time, it overheats and races.

http://www.fixkick.com/IDLE-AIR/iac-wave1w.jpg

[Freaky Beanie]

Yeah my ISC seal is a slot and not 2 holes