car hesitates

[OneJoeZee]

yes thats the only code im getting... ok i start up the car revvs fine, when i go to drive and pull out the car stops revving at 4k and starts popping... and im not even getting boost at all from the start of 1st gear... i thought it was vac problems but its not... i've lookd up about caps and stuff and i was wondering if that is the reason y i cant revv hi??? more on driving... is when u start off from 1st till iono 3500 where boost is suppose to hit, and it doesnt hit... then towards higher rpm it starts to pop like crazy and the rpm stops moving and wont go past 4k...what could it be???

Are you sure your vacuum line on the MAP sensor is secure? If it's on there, are you sure it's the right size and it's not just leaking under pressure? It's a good idea to zip tie that line. If all that is fine, check to make sure that vac hose is not cracked or leaking. Are you t'ing anything off the vac line? Try replacing it with a new vac line. That sounds like a symptom of a disconnected MAP sensor... Car will start and drive fine until you try to boost and then breaks up to all hell. Check the integrity of the wiring for the MAP sensor. Although 4000 is really late to be building boost if that's where you are seeing boost pressure. Maybe you have IC pipe leaks, especially if you can't boost in 1st. Just looking at the pipes and hoses isn't going to cut it. You can have small cracks and splits your eye may not catch but will burst open wide under boost pressure. Maybe your turbines are shot causing late spool... Has the car been this way since you first started it? Stock turbos have been known to be dead from the get go of a swap. It's happened to me.

Are you monitoring boost with an aftermarket gauge to see how the boost is acting? That would be good to see.

Maybe it's just your plug gap or dead plugs, period... I don't know if you said you did that or not. You may want to, try some NGK 6097s gapped around .28 or .30

I've had a bad 02 sensor before but the car didn't hesitate. Gas mileage just sucked something aweful.

 

[AZN MK3]

Are you sure your vacuum line on the MAP sensor is secure? If it's on there, are you sure it's the right size and it's not just leaking under pressure? It's a good idea to zip tie that line. If all that is fine, check to make sure that vac hose is not cracked or leaking. Are you t'ing anything off the vac line? Try replacing it with a new vac line. That sounds like a symptom of a disconnected MAP sensor... Car will start and drive fine until you try to boost and then breaks up to all hell. Check the integrity of the wiring for the MAP sensor. Although 4000 is really late to be building boost if that's where you are seeing boost pressure. Maybe you have IC pipe leaks, especially if you can't boost in 1st. Just looking at the pipes and hoses isn't going to cut it. You can have small cracks and splits your eye may not catch but will burst open wide under boost pressure. Maybe your turbines are shot causing late spool... Has the car been this way since you first started it? Stock turbos have been known to be dead from the get go of a swap. It's happened to me.

Are you monitoring boost with an aftermarket gauge to see how the boost is acting? That would be good to see.

Maybe it's just your plug gap or dead plugs, period... I don't know if you said you did that or not. You may want to, try some NGK 6097s gapped around .28 or .30

I've had a bad 02 sensor before but the car didn't hesitate. Gas mileage just sucked something aweful.

well i know its not the IC pipping because i just bought new ones and i just put them on... the car spools right at about 3500 but then right when it hits like 4k it starts breaking up like crazy... well im running a map sensor from a celica 3sgte engine, i've searched and was said to work on the 1jz. truth or not, im starting to think not... if you had the same problem and it was the map sensor... well my vacuum lines are all new... even the lines on the turbos are new... spark plugs have been replaced about 2wks ago... gapd to .30 came pre gapped at .30 actually and i checkd... i know the turbos are fine because i can hear them spool and its not spitting out and black smoke... wiring i've checkd today and im getting continuity and a resistance of .03 -.05 ohms so i know thats good... it just seems to be like something simple but what i dont know... kinda making me sad almost done and yet i cant even feel the boost.... :-( nor revv up past 4k...

 

[OneJoeZee]

Don't know anything about 3S MAP sensors. Sorry.

Maybe borrow a Supra MAP from someone local and see what happens.

Or, tell us what the part number is and we could tell you if it's the same part. Never heard anyone using a 3S sensor before.

 

[Rich]

Quote:
Originally Posted by tissimo
code 31 is map sensor?

thats what im trying to find out....

Yes it is.

 

[AZN MK3]

Don't know anything about 3S MAP sensors. Sorry.

Maybe borrow a Supra MAP from someone local and see what happens.

Or, tell us what the part number is and we could tell you if it's the same part. Never heard anyone using a 3S sensor before.

ok the part # is 89420-20070

 

[AZN MK3]

Yes it is.

if thats so u think my 3sgte map sensor isnt compatible???

 

[OneJoeZee]

ok the part # is 89420-20070

I'll check if my MAP sensor p/n matches before I leave work in an hour.

Or if anyone else has that info before then, feel free to help out.

 

[AZN MK3]

I'll check if my MAP sensor p/n matches before I leave work in an hour.

Or if anyone else has that info before then, feel free to help out.

thanks joe... btw.... is this the intake air temp sensor???

 

[OneJoeZee]

Yes. Shouldn't be a cause of your problems, though. Mine isn't even plugged in.

 

[OneJoeZee]

ok the part # is 89420-20070

My 1J sensor reads P/N 89420-14060



I would find a 1J sensor if I were you. Jose (Soapra) has one in the JZ parts FS section, I believe.

edit: http://www.supramania.com/forums/showthread.php?t=47899



I've never heard anyone using a 3S sensor. Therefore, I'm inclined to believe that since the only code you're throwing is a MAP sensor code, it would be best to get the correct 1JZ part.

How did you end up with a 3S sensor anyway? Can you link me to the source you found in your research saying it would work?

 

[OneJoeZee]

Also, I still think you have a pressure leak. 3500 is still late to be spooling the CT12s. You should be hitting full boost in the neighborhood of 3000.

 

[AZN MK3]

My 1J sensor reads P/N 89420-14060



I would find a 1J sensor if I were you. Jose (Soapra) has one in the JZ parts FS section, I believe.

edit: http://www.supramania.com/forums/showthread.php?t=47899



I've never heard anyone using a 3S sensor. Therefore, I'm inclined to believe that since the only code you're throwing is a MAP sensor code, it would be best to get the correct 1JZ part.

How did you end up with a 3S sensor anyway? Can you link me to the source you found in your research saying it would work?

so you say that you dont have your air temp sensor pluged in well i was messing with the map sensor and i was checking the wires to see if there all connected and i was messing with the air temp sensor and for got the key was in the ignition and then it started acting funny... then i checkd codes again and im getting code 24 which is the intake air temp sensor and code 31... as for the 3sgte map sensor heres a sites that say it.... but i cant find it. its on that web site automotiveforums.com... i really need to get this car fix.... thanks man... im goin to have to try to find a 1jz map sensor then...

http://www.clubna-t.com/forums/showthread.php?t=3954

 

[OneJoeZee]

My car still runs fine without the IAC.

I've seen some dumb shit on that automotiveforums place before. I wouldn't trust that place.

I don't see anything in the clubnat link confirming a 3S sensor as a proper replacement.

Where do you live? Maybe someone near you can let you borrow their 1J MAP to test.

 

[Rich]

My car still runs fine without the IAC.

Ehm, to calculate load, like the ecu does, air temp is part of the formula...
It might work without it, but it won't be optimal.

 

[OneJoeZee]

Didn't say it was. Just stating to show that it's not a cause of his symptoms.

 

[AZN MK3]

thanks joe... where does the 2jz map connect to the same hose right... well why does it look different well i hope thats the only problem that i have...