HELP!!..many codes and more!!

[apexi287]

this may be long so please bare with me..ok ive been going at my car for 3 days now and no luck what so ever i may not be doing everything correct thats why i need help..ok first off the problem at hand i got my car back from the shop after they replaced my headgasket and put on a brand new cylinder head and brand new seals throughout the entire engine..they also rebuilt/replaced my ECU and repaired damaged parts in my wiring harness it still is a little fraid and old in places but what can you expect from something so old...anyways when i get it back i turn on the car and i get this incredibly loud hissing noise from my intake side around the rear fuel injectors(it sounds like)..i tried to feel around to try and feel air because youd think that loud of a sound air would be escaping in large amounts but no i felt no air..so i thought maybe my gaskets were bad or the intake manifold wasnt on tight enough so i take it off and replace the gaskets and also put sealant on them and tighten each bolt as tight as they should be put everything back together and also while i did this i replaced every single vacuum line as well thinking it couldnt hurt..once it was all back together i turned the key the hissing is still there and it still stalls farely easy/almost right away it also backfires everyonce in a while..so then i decide to run a diagnostic on it i got codes 21,51,52,41...the sensors it said to replace were the 02 sensor, water temp sensor and throttle position sensor..so i replaced all those except i have to wait till tomorrow to get the 02 sensor they had to order it..i figured the throttle position sensor would fix it but it actually made it worse i hit fuel cut at 2k rpms and then it will die..i heard you need to calibrate the tps but im not really sure how to do that at all i think that may help but i dunno..it also said and i read that my egr solenoid may be bad so im hoping ill get that in tomorrow too cuz that may be were the leak is from i dunno..could bad fuel injectors make that noise cuz it seems almost directly on them?..but if anyone has any idea or wants to help me out if your local that would be greatly appreciated this is my only car being that i am still a kid so i need it so i can get around to school and shit...thanks in advance

 

[shaeff]

ok first off the problem at hand i got my car back from the shop after they replaced my headgasket and put on a brand new cylinder head and brand new seals throughout the entire engine..they also rebuilt/replaced my ECU and repaired damaged parts in my wiring harness it still is a little fraid and old in places but what can you expect from something so old...

what exactly did they do to fix the ECU? that's kindof weird, i've never heard of shops doing work on the ECU before...

anyways when i get it back i turn on the car and i get this incredibly loud hissing noise from my intake side around the rear fuel injectors(it sounds like)..i tried to feel around to try and feel air because youd think that loud of a sound air would be escaping in large amounts but no i felt no air..so i thought maybe my gaskets were bad or the intake manifold wasnt on tight enough so i take it off and replace the gaskets and also put sealant on them and tighten each bolt as tight as they should be put everything back together and also while i did this i replaced every single vacuum line as well thinking it couldnt hurt..once it was all back together i turned the key the hissing is still there and it still stalls farely easy/almost right away it also backfires everyonce in a while.

hissing at idle is definately a vacuum leak. there shouldnt be any hissing at all. it wouldnt blow air out, it would suck it in, which lets in unmetered air and plays all kinds of mean tricks on your ECU. check the coupler for the 3k pipe to throttle body, as well as the throttle body to intake manifold. there are quite a few vacuum lines that run under the intake manifold, you might have more luck diagnosing the problem from below with the undercover off.

so then i decide to run a diagnostic on it i got codes 21,51,52,41...the sensors it said to replace were the 02 sensor, water temp sensor and throttle position sensor..so i replaced all those except i have to wait till tomorrow to get the 02 sensor they had to order it..

many times you dont have to actually replace the sensors, but only clean the connections. you should calibrate the TPS in accordance to the TSRM. here's the link: http://www.cygnusx1.net/supra/library/TSRM/fi/FI_100.html flip through the next few pages and you'll see how to calibrate it.

i figured the throttle position sensor would fix it but it actually made it worse i hit fuel cut at 2k rpms and then it will die..

hitting fuel cut at such a low rpm is indicitive of a very large boost leak. are you sure that you hear the hissing where you think you do? check all of your intercooler pipes. the most common culprit is the one right off the bottom of the turbo. it's prone to cracking because of the extreme heat in that area. look them over super well!

i heard you need to calibrate the tps but im not really sure how to do that at all i think that may help but i dunno..

see above on how to calibrate the TPS. i gave you a link

it also said and i read that my egr solenoid may be bad so im hoping ill get that in tomorrow too cuz that may be were the leak is from i dunno..could bad fuel injectors make that noise cuz it seems almost directly on them?..

i had a leaky throttlebody to intake manifold gasket, and it sounded like hissing injectors. it is possible that your injectors are making the noise, but more than likely they arent. look for fuel spillage, leaks, gas smell. that'll let you know if you have a fuel leak/injector leak.

but if anyone has any idea or wants to help me out if your local that would be greatly appreciated this is my only car being that i am still a kid so i need it so i can get around to school and shit...thanks in advance

if you're anywhere within an hour of kingston NY i'd be glad to lend you a hand, but if not, i'm afraid my schedule won't allow. hope this helped!

-shaeff

 

[apexi287]

yeah well im in ohio so i guess it wont work out..but as for all of that ill try it all and see what i come up with..so far i kno there is no gas leak or anything so im guessing its not the injectors which i reallly hoped it wouldnt be..all my vacuum lines were replaced top and bottom so the vacuum lines should all be good..ill check/replace the throttle body gasket and see what that does and check the IC piping by the turbo..i also noticed the pipe that connects the 3000 pipe and throttle body is cracked decently but before it is clamped that may be it who knows..but ill c what happens and let you know..thanks for all that help

 

[mkiiSupraMan18]

No crapp shaeff, let some of the rest of us help out.... :icon_razz

Anyway, I was gonna say the coupler on the 3k pipe..... but coming from the last injector......... I remember getting a wire caught below a valve cover on my dad's 302....... maybe something like that happened..... but if you replaced it, I wouldn't think that would be likely. Are all of the lines tight, and hole-free? I could see that one nut getting started crooked and not getting a good seal and leaking air...... possibly the same with the EGR cooler? Maybe they crushed a hose putting it back in? Just throwing stuff out. Good luck.

BTW, I'm either 3 or 4 hours away, depending on which county you're in.... so I don't see anytime I could make it out there in the near future either. :icon_conf

 

[apexi287]

im going to calibrate my tps tomorrow but what exactly occurs when you do it..it seems all you do is use an OHMmeter with wires and make sure you have the correct readings..what happens when you dont how do you change it so its right..its seems like such an easy process but i dont see what really is being done or how to actually do it besides connected wires in the sensor connector to get readings....

 

[shaeff]

you adjust it by loosening the two set screws that hold it in place, and move the throttle plate to different positions following the recommended calibrations in the TSRM. once you have it within spec (resistance compared to throttle plate opening) then you tighten those screws down nice and well

then you clear your codes, and enjoy not having a CEL

-shaeff

 

[apexi287]

i was searching around on the forum do try and see if anyone else had the same hissing/stalling issue and i came across a guy that had the same exact thing only the hissing was coming from the front of the intake side..he discovered it was his injector o-rings on the cylinder head side causing unmetered air to enter the head causing a hissing vacuum leak which helped to misfire and stalling because they were damaged when replaced and didnt seat right..i just got those replaced when i got my headgasket job done so im thinking i figured it out..well i didnt figure it out but i know what it is now..i hope it is..let me know if you guys think it could be it..then ill also let you know after i replace them :naughty:

 

[isnms]

Sounds like you may be on the right track.
Might look into finding a shop that will do a smoke test on your engine. It will find every crack, leak and hole in the system. I took mine to a local Goodyear and for $80 they found the hole in my intake manifold gasket. I'm sure you've spent more than $80 replacing all the miscelanious parts and still chasing the problem. There are many other ways of DIY to find the leaks...spraying your choice of wd40, starter fluid or other, hook up a vacuum cleaner and fill the engine bay with smoke (cigar), hook some air pressure into the system and listen or many others and still not find it.
boost/vacuum leaks can be a beast to find. may be the tiniest of pin prick in a hose. let us know what you find

edit: i said all that because, i've done mose of it trying to find an elusive leak. large leaks i found just fine this way. one hose i found and an inch slit on the under side. that one was easy to find with the diy pressure test. it's the small ones that become large ones under boost that are hard to find.

 

[apexi287]

ITS FIXED!!!..the fuel injector o-rings were the problem the #5 & #6 cylinder injector o-rings were completely cracked in half so replaceing all the o-rings/seals did it..thank god..all i need to do tomorrow now is pick up my o2 sensor thats coming in and hopefully get a radiator fan cuz mine doesnt work so replacing it will probably help the overheating issue also..just wanted to let everyone kno and ill keep you guys posted if the fan helps the overheating as well... :biglaugh: