Jeffers_21

I Changed my exhaust yeasterday and put a mid pipe on aswell. ive got a boost controller that is limiting the boost to 0.5bar it's pretty stable boost all the way though the rev range. i know people say you should do the mid pipe after you have done the ecu but my cat was nackered and being my only two mod's (apart from the avcr) i thought this should be alright.

however today was the 1st time i took it out and tried it. im having problems with the car hunting at idle. it sounds like a leaky vac somewhere as it only does it when warm and when you put your foot on the clutch and put it in gear it steady's out. its hunting from about 650 - 750rpm. any ideas on what this could be?

also when puting your foot down a bit it feel's quite slughish at 1st you get to about 3500 and it pick's up again, when 2nd turbo kick's in it fly's untill about 6000rpm when it start's to loose power. it just wont go any higher than 7000rpm

now i dont know if this is anything to do with it but i did brake the cat overheat sensor when trying to get the soding rusty bolts undone on it, so the cat overheat light is on at the mo, someone told me that if i join the two wires it will make the light go out but havnt got around to doing that yet.

i only took it out the once then brought it back home as it just didnt feel right.

any ideas?

Mahjik

iTrader: (1)

What did you do with the airpump?

Jeffers_21

the air pump is still there. the tube that was going to the cat was tucked up out the way.

Mahjik

iTrader: (1)

Do you still have it connected to the wiring harness, or did you disconnect it?

Jeffers_21

it is still connected to the harness. i havent touched the air pump apart from the pipe going to the cat. is this a problem?

Mahjik

iTrader: (1)

That should be fine. Has your vacuum at idle changed?

Jeffers_21

nope seams normal. could it be something to do with my tps? i have noticed that before i changed the mid pipe if i have air con on coming up to junctions the car would sometimes rev to low and not come back up quick enough, so it would just stall.

but thats only with the air con on. its just strange that its only started doing it when i changed the mid pipe. before i did it it was running fine (apart from the lower boost as i havent got the avcr set up prob yet) but as it is now the car is no where near as quick and just dosent feel right at all.

would the cat over heat sensor put the car in to limp mode or something? (its a 93 jdm type r)

Mahjik

iTrader: (1)

I'm not away of the catalytic heat sensor putting the car into limp mode. I'm not saying it's not possible, but I've never seen/heard it.

TPS adjustment is possible. It never hurts to verify that your TPS is within range. Also, cleaning out and re-lubing the ISC (Idle speed control) might help as well.

Jeffers_21

would the tps or idle controll valve cause the lack of top rev range end power? or do you think this could be a compleatly seprate problem?

sublime42o

im a 2nd gen owner, but most of the idle problems I've ever come across were caused by either: bad ground(s), or maladjusted (or malfunctional) TPS. If you haven't checked/replaced your grounds lately, I would definitely give it a shot, it costs next to nothing and will probably make something else work a little better too! Definitely could be a vacuum problem though, might want to let the car idle with the hood up, and mist a teeny bit of WD40 or starter fluid around in various places (esp the turbos, IC pipes, and rats nest) and see if it makes the idle change, if so theres your leak.

sublime42o

I would also DEFinitely clean out and re-lube the idle speed control, if your idle changes when your turn on the AC or something and doesnt level back out immediately, that could be the culprit.