Ok here are some stats on the car as i have been told. 1987 supra n/a blew it up,took a 1989 supra turbo and swaped everything,so its really a 1989 supra i guess you could say.when he first swaped the engine in eveything it was auto and it ran good.pulled the engine back out and "built" it.The 2nd day with the newly "built" engine the auto lost 3&4 Gear.so he swaped a R154 at the same time he put on a Maftpro.well when they started the car it had a miss it idle,with no power and would sometimes die at WOT.he couldnt figure it out and well this is where i got the car...it still has a miss at idle and it will cut out like fuel cut if you hold it to the floor for a few seconds.everyone said it was the maftpro so i took it out of the car and it still has a miss and feels way under power and runs rich(keeps killin plugs lol)..i only found out yesterday from the guy that built it for him. that the car has 550cc injectors and a 255 fuel pump.with a stock fpr and the j-tube in place.i think thats where the richness is coming from and im going to try and fix that this weekend.the miss at idle mostly goes away when you give it gas,but still feels way under power for what it is,almost like one of the coil packs are dead but the all check out good.Any info will help. its has a auto engine harness wih a auto ecu but has a 5speed,stock turbo w/3in ddp,oddly ran air charge cooler pipeing,TurboXs RFL BoV,no EVAP stuff of any kind with EGR block off plates,He said it has a "JDM" TB,If you need and more info about the car let me know and ill do my best to get it to you asap.ANY Help i will be great full for.

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Originally posted by boost2kill:
Ok here are some stats on the car as i have been told. 1987 supra n/a blew it up,took a 1989 supra turbo and swaped everything,so its really a 1989 supra i guess you could say.when he first swaped the engine in eveything it was auto and it ran good.pulled the engine back out and "built" it.The 2nd day with the newly "built" engine the auto lost 3&4 Gear.so he swaped a R154 at the same time he put on a Maftpro.

I'll only tell you this one time: Please formulate proper sentences so that normal humans can read what you've written without our heads exploding. Thanks!
Sounds like there was a bit of work done to this car- it's never fun to figure out what the previous owners did.

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well when they started the car it had a miss it idle,with no power and would sometimes die at WOT.he couldnt figure it out and well this is where i got the car...it still has a miss at idle and it will cut out like fuel cut if you hold it to the floor for a few seconds.

Do you have an aftermarket boost gauge? If so, what's the vacuum reading at idle? I highly suggest you check the diagnostic trouble codes. Here's how:
http://www.cygnusx1.net/supra/TechTips/engine_error_codes.aspx

Get back to us with what codes you have, if any. Also, check for boost/vacuum leaks. Check every coupler, every pipe, especially the coupler between the 3000 pipe and the throttlebody, as well as the charge pipe off the bottom of the turbo. Both have been known to split wide open.

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everyone said it was the maftpro so i took it out of the car and it still has a miss and feels way under power and runs rich(keeps killin plugs lol)..i only found out yesterday from the guy that built it for him. that the car has 550cc injectors and a 255 fuel pump.with a stock fpr and the j-tube in place.i think thats where the richness is coming from and im going to try and fix that this weekend.

It's nice to see that you've done some research already. Here's how to remedy the J-tube issue: http://www.supramania.com/forums/showthread.php?t=34548&highlight=j-tube

The richness could be a number of things: the issue you just mentioned regarding the j-tube, code 52 (knock sensor circuit), boost/vacuum leak (lean at idle, rich under load), etc...

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the miss at idle mostly goes away when you give it gas,but still feels way under power for what it is,almost like one of the coil packs are dead but the all check out good.Any info will help. its has a auto engine harness wih a auto ecu but has a 5speed,stock turbo w/3in ddp,oddly ran air charge cooler pipeing,TurboXs RFL BoV,no EVAP stuff of any kind with EGR block off plates,He said it has a "JDM" TB,If you need and more info about the car let me know and ill do my best to get it to you asap.ANY Help i will be great full for.

For the miss, start looking for bad grounds, specifically the ground that goes from the driver's side of the coilpack to the head. The auto harness/ecu doesn't matter. I would triple check the intercooler piping, as that is definitely the culprit on a lot of member's cars.

But yeah, check those codes and get back to us.

Hey,im sorry bout the sentences.This car has me really stressed right now,im just ready to see it running right or burning to the ground.

Thanks for taking your time to read and help me out.The previous owner is kinda of a dumbass.But i did talk to the guy that worked on the engine and found out that it has a set of crower rods with cp pistons,billet main caps,a titan head gasket,arp head studs, with a list of a lot of other parts,he said the kids parents paid for everything.So im hoping that all this is worth me going crazy over.

Just a Stock Boost gauge for now,im trying not to put a lot of money into the car until i get it running strong.Im going to bring home a Vacuum gauge home from work this weekend.20"hg is about what im looking for on this engine correct?

Im going to get the codes when i get home this weekend im on call till the end of the week.

Thanks for the link on the j-tube.

And most of all thanks for your help,im going to look everything over as well.

Well i got some info for you.Fuel pressure is 20psi at idle and drops to 5 when you hit the throttle.when i pinch-off the return line the pressure goes up and to about where it needs to be.so i need a Fuel Pressure Regulator.

I was looking at the coil packs and there is no ground wire so i need to fix that.I took the coils off the plate they are mounted to and one coil is almost completly melted on the bottom so i got to get a coil or a set if i can find them at a good price.

im going to go look for parts and ill let you know how it goes.Thanks for your help.

It's nice to see someone who's enthusiastic about the car, and learning how it works as well. People like you are few and far between.

I'm not saying your motor isn't what that guy said it is... but I find it difficult to believe that it doesn't even have an aftermarket boost gauge in it with all that internal engine work...

Fuel pressure should increase as you open the throttle. Less vacuum= more fuel pressure. It's a rising rater regulator. Before you go changing out that regulator, I'd see if there's a way to check it per the TSRM. It might not be faulty. Your problem could lie elsewhere, such a place as a clogged fuel filter. (I had that same problem, clogged filter)

The FS section at supramania.com is pretty good, might want to check that out for a set of coilpacks.

You're welcome.

The boost gauge is in the kids new svt mustang that he got,along with the Lc-1 W/B.

I did a cut-out test to see if all the cyliders where running and well number 5 dont change that much.the spark going to the clyinder is fine.i can unplug the injector and the sound of the engine dont change much at all but it still has that miss/skip,but little worse when the injector is unpluged

When you cut the key off fuel pressure is supost to say up a little bit correct? well this bleeds off kinda quickly,and its fouling the plug...you dont think it could be a leaky injector do you? im going to try and find a set to try and see how it does.

Thanks for the filter idea,And all your help.

This message has been edited. Last edited by: boost2kill,

well i got a new filter on it and it is still low on pressure.would it be best to put a aftermarket pressure reg. like he had b4 he took it off or go OEM for now?

OEM will be fine for the time being, but I'd look into the reason that the fuel pressure dies off so quickly.

Just to let you guys know,i have been working on the supra when i have time,lots of work gets in the way sumtimes.

but my work has found the number 5 injector to be stuck open,so now i got to get a new set.hope to order them friday

Why not just pull them and send them to RCengineering to have them cleaned and flowtested? 99% of the time, they can match them to 1% of each other.

No need to order new ones unless you're going larger.