Very Quick Question

[1nst1nct]

i drive a 1990 240sx, and latley its been having trouble starting and also the idle on it hasnt been very steady what so ever. so i tried replacing the fuel pump and fuel filter thinking it would help, but no results... so now that i think about it, i used to have 2 bolt clogging up the outs on my headers, well the on in the headers fell out, so i just took the pipe and screwed it back into the damn thing. well the pipe has a small bolt in it aswell, and about 2 weeks after doing this the car started to have the idle and starting problems.... so my question is

a) could it be that this bolt fell out, and now is causing enough back pressure to where the car is acting like this

b) if i tomorow disconect the cat where its bolted to the downpipe, move it aside, and try to start, should it start normally if this was the problem all along

any answers, hints, tips etc that might come in handy are apriciated

thanks to all who respond

[1nst1nct]

sum1 please help me out...

[95auto]

what the fuck are you saying?
am i the only one who didnt understand a bit of that?


adam

[kandyflip445]

Originally posted by 95auto
what the fuck are you saying?
am i the only one who didnt understand a bit of that?


adam

:werd:

[MasterOFDrift]

yea man yea, clarify yourself and maybe you will get some responses.

Try to list out everything in steps or something. You are just typing what is poppin into your head or something:aw:

[ckyfish]

theres a bolt in your header right before the cat?:wtf:

[1nst1nct]

sorry that was one of those late night, drank too much posts... heres the deal

when you install aftermarket headers, there is a hose looking thing u connect to them towards the top and the bottom of the headers, they are called the ins and outs on a header. well the guy who put the headerson didint connect these hoses, but rather use lugs to clog them up saying it produces more horse and all this other stuff, so i said allright. well a few weeks later on the outs of the header(the bottom of the 2) the lug fell out of the header. so what i did is just screw the hose/pipe that was supposed to go there originally back in. the problem is there was still a smaller lug inside this hose. so what happened is that lug got loose and fell out, well my guess is it just slid right back toward the catalyc converter, and probably got stuck in it, causing more back pressure than usuall. with this said, about 2 weeks after screweing that pipe/hose in, my car starts acting funny... has troubles starting, oce it starts the idle dosnt stay steady and so forth, so all in all the car is triying to function normally very hard, but something is preventing this from happening(my guess was that bolt in the cat causing all the backpressure). so my question is if i just went ahead and bought a new cat, if this would fix the backporessure problems and if it would help my car run normally once again... well today i bought a new cat, and took the old one off, so preatty much i was running straight headers at this point. i tried to start the car a few times, but it still gave me some difficulty, although not as much as before. so tomorow im putting the new cat on (ran out of time today) and seeing if this fixes my starting problems, but if it dosnt, heres my problem in detail....

after the car sits there for more then a few hours after running, ithas a very hard time starting, for example... the rpms will jump between 0 and 200, so its turning over, but they will not go obe that so the car never actually turns on.

also sometimes once started it gives out a very low note, sounding almost liek a tractor, note is very low and a lot of cracking and poping going on aswell.

and to tope this all off once the car IS running, if i come to a stop at a light or something, the idle will just not stay steady, itll hope between 500 and 1500, and sometimes even almost turnoff.

so once i replace the cat if this problem continues, what do you suggest i do to get it fixed...

p.s. i already put in new spark plugs, and spark plug wires, and a fuel filter triying to correct this poblem with no luck, the car is a 1990 240SX hatch


thaks to all who replied telling me i need to sober up and clarify myself, hopefully somebody will be able to help me out now...:bash:

[Phoen_x_s14]

hmm.......was thinking it might be your TPS, but thats on the intake manifold. A friend of mine had similar problems when a couple of his vacuum hoses to the TPS weren't connected right.
hmm another thing, when I was changing my 02 sensor out, I had no other car to pick up the 2nd 02 sensor so I had to drive my car. It made a high pitch "whine" because air was escaping throught the exhaust manifold and revs were jumping constanly back and forth. Repost and ask members if they have a Haynes manuel and see if there are any vacuum lines from the header.

[mbmbmb23]

I would take it back to that guy and have him hook up all the bolts that are supposed to be bolted. Please tell me he didnt fail to hook the O2 sensor back to the header? I need more details about what was left "unbolted". I know my 93 FSM talks about an EGR Temp Sensor that the Cali models had, maybe this is one of the blocked header holes you have. I would get that bolt outta your cat and re plug those bolt holes in the manifold. The popping sound you are hearing could be unburned gas in the exhaust hitting a red hot bolt (thats in your cat), causing little fireballs to happen inside the cat.



-m

[1nst1nct]

allrighty, i have now replaced the cat, with no luck what so ever, car still has a hard time starting, low idles etc etc.... however i have noticed that when it does start, it gives out this high pitched squeeking noise.... any help yall can give me now?:cry:

[1nst1nct]

bump, sum1 please help

[lhracer05]

try resetting your ecu and cleaning out your throttle body and intake. good luck on getting it fixed.

[Var]

Dude the hose you put in may belong somewhere else. First of all WHAT THE FUCK are ins and outs? I've never heard of that shit. The only holes i can think of in the header would be for an O2 sensor . What i'm thinking is that somehow you have bypassed the EGR valve so it's constantly working, which would cause the hard start and idling problem. Find you EGR valve and disconnect EVERY hose going to it and see if it fixes the problem. If the problem goes away, , make sure to hook your EGR back up using the correct routing. the vaccum diagram should be under the hood.

[Scracho]

Process of elimination... Check the obvious ie: plugs, cap, rotor, coil, vacuum, etc. Best thing to do is refer to the service manual and check for that kinda stuff first.