Help, any one heard of adding a ground wire to
 

adding a ground wire to either the iac or the tps on 88-91 hondas for idling issues? my car sometimes goes down to 400 or lower idling and runs rough, been thru everthing else 4 times, thought i'd read somewhere about grounding the tps ground to the chassis(some groudn issue some of htem had?) would fix it. anyone konw of info on this? would like to get this fixed very soon.

Re:Help, any one heard of adding a ground wire to
 

I doubt it.

Try taking your idle adjust screw and turning it all the wayt close till your car dies or it is closed then back it out 2 turns. Do this after your car is fully warm and all acc is off. Fixed the problem for me

Re:Help, any one heard of adding a ground wire to
 

:) forgot notify of replies

Re:Help, any one heard of adding a ground wire to
 

its not that easy. i've done everything to this car and nothing is working. the screw doesn't change ----. tried different iac motors, diff thottle bodies, different computerers, different map sensors, everything. doesn't matter if i'm running pm6 setup or the p28 with wiring adapter. can't get it to idle good for anything. it sometimes idles good then it will kick down to 3 or 400 and idle rough. when it does that it doesn't want to run good at any rpm. no codes though. please help!
btw its a 94 d16z6 in a 90 civic wagon.

Re:Help, any one heard of adding a ground wire to
 

If I fix it.. do I get a cookie?

ok your running a D16z6, I am assuming you kept the D16z6 intake manifold? using the factory D16z6 Throttle body? Well, 92+ and all B-series use secondary cold idle air control valves located directly underneith the throttle body. If this peice is not working correctly your idle will bounce and get all fucked up. Its not an electric unit, if you have another one, try it and see if it changes. Also, be sure to take your throttle body off and clean the ---- out of the idle air screw passage, because that should change the idle somewhat.

Jeff

Re:Help, any one heard of adding a ground wire to
 

I'd give you a whole pack of cookies. yeah I tried adjusting that sucker, then I tried another throttle body alltogether from a known working one.(that peice came with it)it acts like its an electrical problem. sometimes it works fine, the only way to get it to idle up is to unplug the pvc valve, then it revs up and cuts, revs up and cuts. the only part of the problem thats there with the pm6 is the crappy idle, but when i run the p28 setup it feels like it yanks the timing back when its running like that. so sometimes it will pull good, and other times it hesitates and jerks, and then all of a sudden it will feel like a switch was thrown, and it will take off. I think it has a bad sensor connection or ground somewhere, but i've cleaned and checked all the connections I can think of. but it has the low idle/no idle adjust with either computer. lately I've just been driving my hf cause it runs right.
I need to get this fixed before I go nuts.
Oh yeah, I've also tried two other distributors, three computers, new oxygen sensors, different injectors, and just about every other sensor on the ride. :(

Re:Help, any one heard of adding a ground wire to
 

I have heard there is a EAVC valve that can be cleaned this may help....

Re:Help, any one heard of adding a ground wire to
 

iac is cleaner than a whistle. tried two different ones of them also. I am sure I saw somewhere a tsb on running the tps or iac ground to the chassis, but can't seem to find it anywhere.

Re:Help, any one heard of adding a ground wire to
 

have you reset your ECU? worth a try...
if not could be a sticky pedal not returning back to the same position everytime throttle is applied.

Re:Help, any one heard of adding a ground wire to
 

I am also guessing wiring as well, especially if you have done a OBD conversion in your car.. something else is going on. I am sure the parts are fine, as far as a TSB or any type of ground update I honestly dont think so. I will ask a friend of mine later this week to double check.

Jeff

Re:Help, any one heard of adding a ground wire to
 

let your car warm up fully. when it does its funcy idle thingy shut off pull the hazzard and ECU fuses and wait like 30 sec pop back in start up and see if that works. did for me.

I would say that maybe one of the electrical connections is not getting sent thru it... check resistanvce between plugs and ecu

Re:Help, any one heard of adding a ground wire to
 

well i found the info on the ground fix. its for dx wiring harnesses, (which mine is cause I modified a 2wd wagon.) you gotta take the green/white wire at the tps and cut it and run it straight from the tps to a ground on the intake manifold. got it done today but have my turbo off for some mods so havne't tried it out yet. if that don't work i'm just gonna run the pm6 and screw the vtec cause I've not been able to notice when it kicks in anyhow. oh well, maybe once I have bigger exhaust on i'd notice it. thats coming soon.

Re:Help, any one heard of adding a ground wire to
 

you should be able to hear the solenoid kick in in your garage with hood open manually turnning throttle.

the DX harness the 2 outside wires of TPS should be flipped around. I cant see grounding that would do anything as all it does is generate between 1-5ish volt depending on throttle position but maybe worht a try.

Re:Help, any one heard of adding a ground wire to
 

that wire is the ground for the tps voltage. can't have voltage without a ground, and if your ground has a bad connection somewhere in the harness, you will have a voltage drop, which will affect the signal getting to the computer. They had a problem with the ground on some dx harnesses, enough to have a honda tsb on it. yea i did switch the wires, so thats not the problem. I should know later today if that fixed it or not.

Re:Help, any one heard of adding a ground wire to
 

ah i gotcha wel then ya I can see what your doing could make a huge difference. So your gonna gorund the middle wire then?

let us know how it works out

Re:Help, any one heard of adding a ground wire to
 

here is something little that should be tried before making any expensive purchases...
the vac line to the intake...make sure it's connected, and there is no leaks...that could cause fluctuation in idle...
as for using ground lines, those are bullshit...
they work REALLY well if u have a stereosystem that creates engine noise when revved.

Re:Help, any one heard of adding a ground wire to
 

they work REALLY well if u have a stereosystem that creates engine noise when revved.




that would be a poorly gorund amp, speaker grounded system or a bad RCA's with power running along side them to close. thats all that really creates alternator whine nothing to do with TPS sensor

Re:Help, any one heard of adding a ground wire to
 

have you tried looking for a vacuum leak? the manifold gasket or the throttle body use a can of brake clean and spray these areas if idle increases or falls off dramaticly there is a vacuum leak. as for the wiring also if you pull the connector off the eacv the car should stall telling you that the sensor is working try this i have more

Re:Help, any one heard of adding a ground wire to
 

yeah I've been all over it looking for vaccum leaks, etc. no such luck. it runs fine with the pm6 other than the idle issue, but it has good power and no hesitation.I just wanted to run the vtec properly. the the p28, you start to ease into it, and it starts stumbling and feels like nothings there, and if you keep on sometimes it will ping. but if you let off some and then go back open it sometimes will straghten up and pull good. very wierd. i'm going to go back to the pm6 tonight I think. this damn thing is going to lean out and blow my motor if i don't change it back to pm6. by eacv you mean the idle air vavle? it will die if thats unplugged. its not supposed to, you're suposed to be able to unplug it and adjust the idle to 500, then plug it back in. I can't open it enough or close it enough for it to idle with it unplugged.

Re:Help, any one heard of adding a ground wire to
 

i will check my honda manual for you to see about the ground wire there are two idle control sensors one is the eacv or elec. air control valve the other is the purge valve one is on the bak of the manifold the other is under the throttle body i did not read this entire forum this is what year car crx, model? and the pm6 is 92-95 vtec coorect
i have diagrams for everything i just need to know what you have happy to help let me know

Re:Help, any one heard of adding a ground wire to
 

pm6 is D16a6 88-91 SI
p28 is D16z6 92-95 Ex/SI

Jeff