Jdm B16a swap, wont hold steady idle...help.
 

what up h-t,
i have a 1995 honda civic ex with a jdm b16a swap. my problem is my car wont hold a steady idle, idles goes up n down n the car wants turn off but sometimes then idles up n down going to a high idle then back to normal. it doesnt idle like that all the time tho, it only does it every now n then. i have checked all the vacuum lines n those r good, also clean the idle control valve so at this point idk what it could be, any info would be great. Thanks:thumbup:

Re: Jdm B16a swap, wont hold steady idle...help.
 

bump! 37 views n nothing

Re: Jdm B16a swap, wont hold steady idle...help.
 

is the MAP and TPS switched?

Re: Jdm B16a swap, wont hold steady idle...help.
 

No, the map n tps r good, the map sensor is actually brand new. would the tps make it idle like that?

Re: Jdm B16a swap, wont hold steady idle...help.
 

I'm almost positive it would. It could be something else. But I would check the TPS. And your sure that the plugs aren't swapped for the MAP and TPS. They have the same plug and they are right next to each other. Cause it sounds like what happened with my swap, i just had them switched. As soon as I switched them back, i had a smooth idle.

Re: Jdm B16a swap, wont hold steady idle...help.
 

I will recheck n switch the plugs to see if that helps the idle n i will let u know how it goes, thanks for helping out.

Re: Jdm B16a swap, wont hold steady idle...help.
 

It could be the throttle body. Gasket mite not be good. I had the same problem.

Re: Jdm B16a swap, wont hold steady idle...help.
 

good luck.

Re: Jdm B16a swap, wont hold steady idle...help.
 

I actually just went to my car right now really quick n ur right that the switches the same so i tried switching them but the harness plug that goes into the TPS isnt long enough to reach up to the MAP so im guessing that they are plugged in right?

Re: Jdm B16a swap, wont hold steady idle...help.
 

i was thinking that too, once u replaced the throttle body gasket did that fix ur problem?

Re: Jdm B16a swap, wont hold steady idle...help.
 

on my swap, i had length either way. But, since you can't swap it, its probably in the right area. Are you throwing a CEL? If so, check the codes. But i would also suggest the TB Gasket.

Re: Jdm B16a swap, wont hold steady idle...help.
 

but it does sound like a bad TPS sensor. I see alot of these broken on swapped motors.

Re: Jdm B16a swap, wont hold steady idle...help.
 

No, no CEL. Car runs perfect no problems just idles weird every now n then but still annoying u know. Imma try to replace the throttle body gasket later today if i have time.

Re: Jdm B16a swap, wont hold steady idle...help.
 

The TPS is actually kinda loose, looks like it was gonna brake. imma try to replace it but its gonna cost a good penny.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Thats the problem right there. You could find them aftermarket i believe. Its been a while since i looked for one. But I rememeber them going for like $20 online. If you go to the dealer, I can see them charging you an arm for it.

Re: Jdm B16a swap, wont hold steady idle...help.
 

i actually just checked autozone online n they only go for 45$ so i think imma go pick one up n throttle body gasket while im at it.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Autozone carries TPS sensors for about $46

Re: Jdm B16a swap, wont hold steady idle...help.
 

cool. good luck man.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Thanks, appreciate the help! :thumbup:

Re: Jdm B16a swap, wont hold steady idle...help.
 

TPS is $15-25 on ebay. Just get one if it looks like its partially broken.

Re: Jdm B16a swap, wont hold steady idle...help.
 

yeah i am, i plan to get one asap.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Just bought my new TPS Sensor on ebay, only $18.40 so it wasnt bad whatsoever, should be getting it by friday or so, Hopefully that fixes my problem.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Wow you got great timing, Im having the same issue. I did all the same things you did, but I went ahead and replaced the coil. But still acting up, and your right its annoying. Well G/L and keep us informed.

Re: Jdm B16a swap, wont hold steady idle...help.
 

what n what have u replced so far on yours? n i'll let u know if mine gets fixed with the new TPS just gotta wait for it to come in the mail.

Re: Jdm B16a swap, wont hold steady idle...help.
 

well I cleaned the IACV, and throttle body, PCV. Replaced the coil and roter, but kept the cap and wires. I cleaned and regaped the plugs back to .044. and put in a larger fuel pump. and checked all the wires to be in the proper place.

All this did clear up the a few small issue but still the idle will drop down from 800rpm to 300 then back up to 800 and hold.

Re: Jdm B16a swap, wont hold steady idle...help.
 

I'm having the same problem too - my post here - https://honda-tech.com/forums/showth...9#post45464929

I will try switching the TPS and MAP plugs if possible - if you've not done it already, try purging the coolant system of air - didn't work for me, but it has cured a fair few of others issues.

I got a new TPS from your side of the pond - £10.76 GBP delivered when everyone over here was looking for £65 GBP on ebay and don't get me started on the dealer prices!

I have put the original IACV back on now as it makes no difference to the idle - unless of course that the one I got (secondhand) has exactly the same issue as the old one - new one from a dealer is over £400 GBP!!

Good luck anyway guys and keep us posted, as will I.

Cheers

Darren

Re: Jdm B16a swap, wont hold steady idle...help.
 

Have you reset the ECU after all the replacement and maintenance you have done?
Maybe alternator is bad? It seems like your idle moves around when there is electrical load in your alternator like fan etc
I'm having somewhat similar problems with my si
But it only happens when ac is on
Good luck

Re: Jdm B16a swap, wont hold steady idle...help.
 

i have so far done the same too, hopefully by replacing the TPS it'll fix my problem tho, i also plan to replace my throttle body gasket. my idles from 800ish to 300ish too but sometimes itll go from 800ish to like 1300ish...

Re: Jdm B16a swap, wont hold steady idle...help.
 

I have reset the ecu after doing any mods, the only thing i can think of is that the harness i got is connected to where the radiator fan is always on bc it came off a turbo'd car but would the fan always being on affect the idle? It doesnt do it all the time thats y im not sure...

Re: Jdm B16a swap, wont hold steady idle...help.
 

I've noticed replacing the IACV doesnt work most of the time, It always comes out to be something else and the IAVC are expensive too to replace. Goodluck on fixing yours n ill keep posted on how mine goes.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Check your coolant. If its low, the car will idle like that.

Kev

Re: Jdm B16a swap, wont hold steady idle...help.
 

Coolant level is good.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Make sure that when you get the new TPS that you calibrate it properly. It should be @ .5 Volts under "0%" throttle and around ~5V under WOT.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Alright sounds good, thanks. Got an email today that it was already shipped so hopefully i get it soon.

Re: Jdm B16a swap, wont hold steady idle...help.
 

yea the shipping is pretty fast, and the sensors have always been good. ive broken my TPS like 3 times now with engine swaps lol

Re: Jdm B16a swap, wont hold steady idle...help.
 

yeah i hear ppl brake em all the time during swaps or they seem to brake during the swap. I just hope that fixes my problem its annoying having it idle all dumb.

Re: Jdm B16a swap, wont hold steady idle...help.
 

yea becuase when your dropping the motor in and lining it up with the mounts, it usually tilts back, and since the TPS is on the back of the intake manifold, it gets crushed on the firewall

Re: Jdm B16a swap, wont hold steady idle...help.
 

yeah, i hadnt even noticed that untill hondaluver19 told me to switch the plugs n when i was taking the plug from the TPS i noticed it was all loose pretty much cracked on the side if not i probably wouldnt of noticed.

Re: Jdm B16a swap, wont hold steady idle...help.
 

Cleaning your iacv doesn't always work...motor of the IACV may still be bad...bust out the ohm tester...touch leads to the iacv motor terminals...should get between 10-15 ohms...if not...than the motor is bad or going bad. This would make it respond slowly to any load placed on it or not at all. TPS sensors rarely go bad...but I guess It's possible... check to make sure its .5 closed 4.5 wot. Best bet is probably to try a whole new t.b. or borrow an IACV from a friend that works to find out before shelling out $$$

Re: Jdm B16a swap, wont hold steady idle...help.
 

But wouldnt my car idle bad 24/7 is it was 100% sure if the IACV was bad or going out, i had this probem like a year ago when i still had my single cam n it would do it 24/7 n this time with my b16a it only does it every now n then? Imma try n barrow a friends IACV to see if mine is bad or not and i still havent replaced the throttle body gasket since i havent had time but i will be changing that too.