Help weird idle

[89supraa]

Alright, today i re-calibrated the tps, took my manual boost controller off and also checked the resistance in the isc. Started it up ran like a beauty, no more viggerous fuel cut( even though i had the controller turned down as far as it could) got home after pry 10 mins of driving. shut it off. Ran inside to get some money for food. came back out started it back up and it was doing it again??.. wth..
I really dont know. Im gunna try my friends afm tomorrow when he gets back into town and see if that could possibly be it. Oh and that scraping noise, turns out it was my electric fans. My cousin who was helpin me said it was the turbo. doh! Any other help would still be appreciated! Thanks

 

[89supracrazy]

You need to stick with your codes. I was curious what was your idle after you installed the tps. The code 43 is saying that you are not getting no voltage to the sta during cranking, at some point in time. I would clear the system by pulling the EFI fuse and check your codes after you drive it for a day or two. You said you checked the iscv. I read that it should make a clicking noise when you shut your car off, and then you can unplug the iscv and plug it back up and restart your car and the idle should be high for a few seconds. They said this is a sign it is working properly.

 

[89supraa]

I realize that you edited out the part about the boost sensor, anyways i did go take a look at it and the white wire from the plug was broke off, so i am going to have to somehow find a new connector because the wire is broken off to far in to solder it back in place. I will check the iscv again tomorrow when there is some daylight.Thanks for your help!

 

[89supracrazy]

Yes I edited the post because I believe the pressure sensor is just for the boost guage that is in the dash. I really dont know if it does anything else. I believe I read the post wrong that I told you. You need to unplug the iscv after hearing the clicking sound and dont plug it back up. Crank your car with it unplugged and see if it has high idle. What I told you in the previous post just dont make sense plugging it back up. Hope this helps.

 

[89supraa]

I did not hear it clicking after i turned it off, but i still unplugged it to see what would happen, and the idle did not change. It still did the surging. Im going to start checking out my ecu with a volt meter and see if its all good according to the tsrm. Thanks!

 

[89supraa]

Again today it ran great then shut it off and started it back up and ran like crap. half hour later it ran awesome. went over to my friends and was tellin him how if i turn the ignition to ON and the check engine light pops up it will run good, but if it doesnt pop up then it runs like crap. Well it didnt pop up but for some reason i flicked on the lights and the check engine popped on. ran good. But just in case i turned it off, turned it back on, check engine didnt pop on, started it up, ran horrible. Idk what to tell you guys, but hopefully you can tell me. OH! when the light did come on i quick checked for some codes and just 43 came up. Thanks!

 

[89supracrazy]

It sounds like your ignition switch might be bad. If you look at the ignition print it shows that it powers the injector circuit and the b+ for the igniter. That might be why you turn it off and back on it starts acting up. Try to jiggle your ignition switch when it acts up to see if it makes a difference. That is also why you are getting a code 43. It can be the ignition circuit itself. Test it by this link.

http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=62

 

[89supraa]

So yesterday i drove it over to my uncles house because he is a mechanic. He started playing around and when he grabbed the hose leading to the iscv from the intake and squeezed closed with a pliers it ran normal, as soon as he released it it would start surging again. We also found that the vacuum hose going from the egr to the vsv, the connector is broke that bolts to the intake manifold is broke so there is just a dead end vacuum line so i need to source out one of those little tube things. Not really sure if it has anything to do with this issue but it needs to be fixed. i pulled out the wires for the ignition and checked for continuity according to tsrm and it all checked out good. Today it wasnt surging but for some reason it was stalling, and then it wouldnt start. just kept cranking and cranking. Finally got it started than it ran alright. Got it home from a couple blocks away and started looking at wiring to the ecu. Noticed that there was a wire splicer on the "efi main relay(coil)" wire right off the ecu, and it was ran to the fuse panel and hooked to a 30A fuse in the wiper one. I pulled that out of there and started it up and it ran good.No hesitation for the check engine light to come on in the "on" position. I checked for codes and i still got a code 43. But now as i am typing this i realize i forgot to pull the efi fuse to clear the memory first. Looks like i will be doing that tomorrow. Thank you!

 

[89supraa]

That idle kinda of went away now.And i am not complaining. But it does still have some trouble starting when it is warmed up..? It will start the first try but bogg down and die right after. Then it will crank and crank and crank, then fire and ill give it gas, and it sounds choppy,but eventually will clear up and then run fine..? Anyways, not sure if this is related to this problem but i decided to take my radiator cap to see how much fluid was in there and i noticed it was like brown on the cap. so i stuck my finger down in there and my finger was brown and like chunky. Now idk if i have a bhg becuase i am not loosing coolant nor any smoke. But tomorrow i am going to flush the system.Maybe the guy who i got it from didnt fush the system when the headgasket blew the first time. Hopefully i am not joining the bhg club and it is just crap in there. Any tips on flushing the system?
Thanks!

 

[89supracrazy]

I unplugged my iscv to see what I told you was correct in my previous post. It was correct. When I unplugged my iscv, idle went up and it started surging. If you unplugged your iscv and it did not change, then your iscv is your problem. That is most likely the same problem with it starting because when you give it throttle the butterfly flap opens up allowing air to go in to the engine. Try it again unplugging it and if it does not change try taking it off and cleaning it. If that don't work I believe I would start looking for one.

 

[89supraa]

i did not have time to clean the iscv today because of work, but i did however flush my coolant. Boy was i glad i did that. All of it was brown, with a hint of green. Anyways it was running great when it was cold, but now as soon as it gets up to normal operating temp it has a very low idle. about 500.Sort of sounds like it is cammed. I will check and clean the iscv when i get a chance tomorrow and hope that it works. Was yours clicking when you turned the car off?
Thanks!

 

[89supraa]

so, since my isc isnt clicking when i shut the car off, and it still is hard to start, you think i should get a different one? I cleaned it, and the idle got better but it is always different. For instance it will idle at 1100 at normal temp, and sometimes it will be more like 800 at normal temp.

 

[89supraa]

Do you think that it could be my cps? I only say that because i read a lot on here about people having to rewire theirs and if it has a bad connection it will cause hard starting. I never messed with it so i dont think that it would be adjusted wrong. Maybe i should check my timing?
Thanks!

 

[89supraa]

so i decided i would check for some codes today,and there isn't any. But it still is having troubles starting. It wont do it every time but most of the time it does. It will start right up and the revs will go to about 1500 then will drop down and keep going, then it bogs and dies out, then it will crank and crank for about 10 seconds then fire up, and run like a charm. Has anybody else encountered an issue like this?Anything special i should take a look at? I don't like driving it now because i am afraid that when i get out of work that it isn't going to start and i will have to get it towed.
Any help would be greatly appreciated!
Thanks!

 

[89supracrazy]

You need to recheck your iscv. I unplugged mine to see what it does and it would idle at 1500 rpm for about a 10 seconds and then start to surge. If you unplug yours and it does not make a difference then that is most likely your problem. Spray the connector with some electrical cleaner also.



http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=107

 

[89supraa]

It does not surge anymore but i will check the isc again tomorrow. Thanks for the link to check it.Do you think that could be the source of the hard starting also?
Thanks!

 

[89supracrazy]

It could be. I checked mine by applying voltage like the tsrm says. Take the iscv off the car get a 12 volt power supply or hook it to your battery but be carefully not to short nothing. Follow the tsrm and make sure the valve moves toward the closed position. All you have to do is touch one at a time and you will feel it and see it move. The faster you touch them in sequence the more you can tell it is working.

 

[89supraa]

Have any of you ever heard of the fuel pressure regulator going bad? I was telling my uncle about whats happining with this, and he thought it could be the regulator. I looked up the symptoms of a bad regulator and it seems i almost have all of them : rich, hard start, sounds like its misfiring sometimes, pulled the plugs and have lots of carbon build up on them.
Thanks

 

[IBoughtASupra]

It can be that but try changing your plugs too, plugs can create a hard start. A friend of mine changed his CPS and wired it in without the connection and it still did not help until he pulled the plugs and saw that they are bad.

 

[sixpatch]

How do you tell the difference between a G series fuel injection, and an L?