sidekick 1.8l stumble

[tizuki]

Hi,i would like to know what to look for (your diagnostic)

My sidekick sport 96 hesitate or stumble during acceleration .Diagnostic trouble code (dtc)
po500,po135 ,the scanner tell me the timing is off 8 i believe the spec are 5 at idle .The trouble is intermittent ,i found ton of information (alldatadiy)but i need some pointer thanks

[jtgh]

scanner shows real timing, dynamic, and engine static is base timing.
ECU advances timing even at idle on modern engines.
and moves ! on yours , IIRC the timing in fixed forever, on sports.
via crank sensor pickup ( you can adj. the gap maybe) no DIZZY.

135 is bad rear sensor. H = heater bad, at front sensor #1.
This will lower MPG.
HO2S Heater Circuit Malfunction Sensor 1

500 is VSS, vehicle speed sensor. IT might be bogus code.

that bad heater can even cause leakage for current to the OXY side.
this will make car run real bad.
If car is so bad it is hard to drive , unplug OXY1 front and try that.
car will run a tad rich and be ok.
that is a trick, but you will get a CEL lamp for all OXY codes. 130-135
just to try until get newone.

VSS. I am not sure about that one, I would reset it and see if 500
goes away and stays away.

[jtgh]

more on VSS
there are 2 sensors with that name.
one on the transmisson tail shaft
one mounted to the speedo head unit. (rear of dash guage cluster)

if you get more fails. tell us , maybe we can tell which of the two so you dont have to spend money on the wrong one.

cheers.

[tizuki]

Many thanks jtgh and every one who read my post héhé.
I dont want to abuse (sorry) but my speedometer doesnt work (po500)
something is broken (cable,gear)can this vss play a role ,by not comunicating
parameter whit ecm,into my mystery engine trouble also
po135 i think it was a bad connection, when i checked the connector
(o2 sensor )two wire fall off.So i did a test at the terminal E33-11 and now a pretty sure it work ,tomorrow i will scan to see wich code as cleared .Thank you

[tizuki]

So you were wright jtgh it was HO2S Heater Circuit Malfunction Sensor 1

[jtgh]

speedo spins, clicker switch in side clicks, tells ECu have far you traveled.
no speedo, no VSS.

broken wire. easy.

the broken VSS might also trip a EGR fail or EVAP as they use distance as markers for activation. just might. not sure. (secret software rules very deep)