1992 samurai custom 4 door, 1994 sidekick 1.6 16 valve, federal computer. New cat, stupid thorley header, cleaned, scrubbed, polished all egr ports and the ss tube, i tackwelded an undersized washer in collector flange to create backpressure, did egr stall test, great compression, valves adjusted, no keyway issues, tested all sensors at computer, o2 is new and working, new fuelpump and regulator, perfect pressure(34 psi with vacuum, 42 psi without), have been dealing with the wonderful state of california smog, and have crazy high nox,(was 2400 ppm, now down to 900-1000 ppm) virtually no hc's, i have narrowed it to the egr vsv opening late and only staying open for a second. Vehicle jacked up on stands in 2nd gear while testing, it appears to opens for a second, then closes. which does no good for 2500 rpm smog dyno test. It only stays open for a second then shuts down, i t'd into vacuum line and switch opens and give vacuum for about 5-10 seconds, then shuts. Where do i go from here? [ATTACH]14930
The ECU commands it to open. You can test the VSV, first by checking that, with the key on, car not running, you have 12v going to the light green/red wire going to the VSV. You can also blow into the upper hose to it (toward the VSV) and air should come out the bottom hose, with the ignition key on.
Its functional, just opening at incorrect time(too high of rpm for smog creating my crazy high Nox) and for super short periods under load. At what rpm/mph is the computer supposed to send power to the vsv? I spoke to brent at trail tough and he said to check vss connections(yellow wire to ecu and vss ground, so far it looks like the guy that installed it never grounded it, just tied into cluster with yellow wire and the original wire for ground isn't hooked up because the factory plug isnt in any computer anymore and someone missed that wire splice. I'm also looking to see if sidekick CEL wire is correct because its never came on since i've owned this rig, and when i made it a 4 door i put toyota trans/tcases in it and didnt have a speedo cable for some time, brent stated that it should had a light on, so here i go....
Well, after spending all day working on it, i removed about 30 feet of extra wiring from the "well known" company harness, they just spliced the 1.6L harness to the 1.3L tfi harness and taped it all together with all the extra unused wires and plugs left on. I have a receipt from previous owner sending instrument cluster to the same "well known" company to have vss installed. Well, i've been arguing with the owner of this company since 2008 stating its not running the way it should, it was originally a 2 door with 33"s and a trail gear 6.5 to 1 t-case and toyota axles. I have lots of friends with this setup and theirs all had way more power. The company owner argued it would have a error code stored if vss is not working, well, upon teardown, i read a writeup on vss install on the zuwharrie site and found out it was never installed right, it was never grounded either. Runs great now, egr kicks in like its supposed to, and power is increased tremendously. I got irritated at the above stated company owner, he started to tell me that the vss doesnt engage the egr til 35mph, which i knew was b.s. oh well, problem fixed..
It passed today, nox was 17 at 15mph test, 450 at 25mph.... as far as harness goes, it sat for a month at referee 2 years ago and has 1 of those cool CARB approved stickers, crazy that the smog nazis didnt catch the vss not being grounded. I recognize your writing style and dearly miss reading your responses and wisdom, i compare you to a toyota genius named Marlin Czajkowski, he like you is full of knowledge. I worked for him for a a few years and learned tons of knowledge even with his extreme sarcasm, he like you, spent millions of hours answering the same questions over and over again. People are just too sensitive these days, I agree on the modifed harness comment, the whole rig is modified, but its because i go on offroad trails all over california, only thing to keep a person sane in this liberal state... thatnks for your response to my thread, i never expected it and have done tons of technical repairs thanks to you, from replacing caps to egr issues..... thanks again!
your welcome. ! its all ASE propaganda, LOL , i used to run the rubicon for years (extreme motorcyles..), when i lived in S.valley.
yes, the vss must work. (i still dont have your ECU PN. so cant advice other issues, based on that.... and wrong harness pit falls...... given that....etc.
the scan tool would have found VSS dead.
such and easy find. with a real scan tool. sigh.
and if you had drove enough, the old OBD1 would have flagged that. code 24, but ECU must see lots of driving to figure out the VSS is dead.
on M/T the clutch switch is monitored, is yours there? (if this pin fails the ecu thinks, YOUR NOT MOVING)
if the car is in gear, and m/T (or off park A/T)is closed and the ecu sees lots of MAF action and RPM Action and zero MPH, it throws. 24s, so yours missed that. due to other wires not connected? to the ecu, is my guess. or not enough road time. !
The 24 DTC is a very tricky test in the ECU. we have many posts here for people not wanting to fix 24s. and rotten MPG and failing EGR.
the ecu needs >1mph off the VSS to work. (one guy here has the software from the ecu and can define 24s way better than me....)
even the fuel mapping is different at different speeds, as is 4 and 2 door body weights and ECU fuel trim for that, (wot and enrich mode)
all keyed of VSS. How ever the MAF based engine can handle vastly more engine mods inlike a 8v TBI)
that vss is the fall back sensor for all 4speed, (vss2 failure) so is used for a vast number of reasons.
congrats on a working EGR, bravo and was pulling for you, i have nothing against any franken. but wonder why folks build them with no docs....
what a hard thing to do.(pat self on back) and have it work.... right. sans scan tool too.
and you demonstrated, that you can pass CAL SMOG with a franken
what challenge ! thanks for sharing it, they are always fun.
I did all your listed tests that i could find before i even thought of asking because i know how irritating it is to have someone ask the same stuff over and over again. I narrowed it down to the issue of vsv signal from computer, i used your test to test mod, cleaned egr routing with your test, check all computer wires with your test, that is when i realized there was an issue with yellow wire, thats when i removed the cluster and realized vss wasnt grounded, vss was installed, but not modified to be grounded, I modified and egr was working perfect..... found you little bugger!
yes , i was not saying it is irritating, only that getting all the monitors run out
can be hard, and hoping that others landing here will see that and then find it faster.
its just a comment for them to save time. not me.....
i spind most my time wait for parts to rebuild my classic cars...
yes, you found it with the failed live test. in fact many times that happens
and is vary good way to find a hard fail. 24s are not a for sure thing.
maybe not for some just driving to church, but if flog it and the park pins are working
it will throw 24s pronto..... i can do mine on demand.
is your car a 5sp and 58B40 ECU?
is your B11 wired?
if not , your ecu cant test the VSS it think and may cause other issues
and if idle regulation is bad
check out pin A14
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