sentra se-r. jdm sr20 stails when hits idle

[jeremymr06]

1991 sentra ser with jdm sr20 motor swap. the car stalls out when the car should idle when driving, pushing the clutch in.it will start right back up.speedo doesnt work. revs fine and pulls good. althought there might be a small vac leak.

we believe it is ether the, speedo cable, speed sensor or the idle control thing. also the speedo cable may not be pluged into the back of the speedometer. does that matter for the speed sensor signal to get to the ecu.

found the car cheap and this is its problem. thanks for your help

[jeremymr06]

engine bay pic

[RED_DET]

Try adjusting idle screw back it out a couple turns and see what happens. Did you change out the temp sensor on the JDM motor to the USDM sensor?

[jeremymr06]

car drove fine for the first year he had it, no problems. second year at somepoint he had it dynoed then 2 weeks later the speedo stopped working and the stalling started to happen. we are going to turn the idle screw out so it will idle high without computer help. havent brought it home yet.Question, the cable that runs from the transmission through the firewall. does it go to the cluster and then a signal is sent to the ecu. or is it the other way around. thanks

[jeremymr06]

does anyone know if the speed signal goes to the back of the gauge cluster then to the ecu. it would be the same for the 240sx and sylvia s13 style.

[RED_DET]

the cable runs to the back of the cluster, clip style plug in. More than likely the issue with the speedo cable lies at the other end that plugs into the transmission. Just replace the cable, very simple.

[jeremymr06]

the cable runs to the back of the cluster, clip style plug in. More than likely the issue with the speedo cable lies at the other end that plugs into the transmission. Just replace the cable, very simple.

took the cluster out and the speedo wasnt plug into the cluster. real tight, a b**** to get it back on. works now but looking into a new cable.

found alot of gunk in the throttle body and the throttle body is closing off all air to the intake. we cleaned it sum, idled a little batter but going to have to find a way to remove it. it doesnt want to come out.

does anyone know if an sr20de cap and rotor will work on an imported sr20det.

someone should post up a replacement parts list for the sr20det.(just a though)

[RED_DET]

SR20DE and DET rotor and cap are the same.

[jeremymr06]

fixed the idle. the idiot who installed the motor used an extra piece of 1/2 inch pipe on the vac hose fitting on the iacv. then shoved the vac hose going to the iacv into the 1/2 inch hose. the extra hose kinked off so no air could get to the iacv and no idle. cap and rotor have been replaced, wires and plugs will be replaced ether today or monday motor still runs rough with hiesitation going into boost and cruising. no problems under boost or if clutch is out but your not pushing the excellerater. it feels like its misfirering so i hope its just fowled plugs. but im also getting realy bad milage.

any help appreciated

[RED_DET]

replace o2 sensor if you are getting bad gas mileage. check timing and check the maf ground as well.

[jeremymr06]

who ever wired in the safc was probly the same idiot that installed the motor. guy i bought it from said he paid 400 for the apexi safc and have it installed. he never wired in the airflow signal so all it could do was monitor. and he didnt go off the power and ground wire. it must have been a 12volt source and a ground but not the right ones. got all the wires hooked up besides the airflow to make sure i got the power and ground right for the safc and thats were i stoped for the night.

going to run a wire from the engine to the mounting point of the ecu. at the same spot i will ground the brown wires for the safc and the wideband i got. im doing it so there is a dedicated ground for both the safc and the wideband plus ground the ecu like it wasnt before i started.(ecu was loose with a loose bolt holding it in place. also broke that bolt in one turn, very rusty.)

jeremy, july 13, 2009

[Akuma362]

I dont know if this will help in anyway but i've heard that the sr20det's dont like to have atmosphere bov. Unless of course you tune it to compinsate for the lack of air flow that the intake would be getting from the recirculating stock bov. If you dont tune it you experience the same symptoms your talking about.

[jeremymr06]

I dont know if this will help in anyway but i've heard that the sr20det's dont like to have atmosphere bov. Unless of course you tune it to compinsate for the lack of air flow that the intake would be getting from the recirculating stock bov. If you dont tune it you experience the same symptoms your talking about.

its recirulated. the only problems now are unstable idle and misfires from 2500 to 3500 rpms. we think is is ether the coil or the cas.i found a coil and distributor being sold together for 60 so i ordered that and it should be here monday.check alty today and it was good. its getting fuel so the problem is ignition. has to be one of the two and both r being replaced.

zer...21622found this article and it sounds alot like my problems. but i dont have the skills or the workplace to dismantle a dizzy like that.

if the coil and dizzy doesnt fix it what else could it be.it feels like complete misfires from about 2500 to 3500 then it starts fireing and it boost good and fast.

coil does have a crack on the top so it could be malfunctioning.

thanks for the support everyone, this site rocks.

[jeremymr06]

when i test resistence on the power and ground wires to the coil i got infinit for power. like i shouldbut i got 73 ohms on the ground wire. is this right. or is there a very big problem.

let me know soon so i dont reground it and fry something.

[jeremymr06]

runs fine now but there is still a problem.i rigged the wideband into the exhaust pipe.readings were very lean. 16 to 21so with the aprexi safc2 i turned the low throttle fuel settings up 30 to 35% from 1000 to 5200rpmson the high throttle settings i turned it up the same 30 to 35% from 3000 to 5800. after that the afr was around 13 so i didnt mess with it.

what would case this. car runs mint now.

[RED_DET]

what ecu?

[ZOMG.SR20]

having same prob but with a RWD SR listening

[jeremymr06]

having same prob but with a RWD SR listening

do you have a post started. link it..

wideband getting installed on friday. then i will be able to tell whats going on with the afr.

[ZOMG.SR20]

zer...62427

[jeremymr06]

what ecu?

its a jim wolf programed for 370cc injectors, 8.5 compression, and stock maf.

its a jdm red top. we have changed the temp sensor and am going to use the wideband narrowband emulator output for the ecu O2 sensor

the ecu is the original sentra ecu tuned...

so what different between a sentra sr20de and a jdm sr20det. temp sensorsO2 sensorsecus read them differentlyinjectors9.5/8.5 compression ratios

what do you think RED_DET

[RED_DET]

Are you using USDM o2 sensor or the JDM? USDM will be the correct one to run. Have you tried adjusting the idle screw? The Air Idle Control Valve may need replacement.

JDM motors run different voltages from ecu to temp sensor, MAF & o2 sensor. JDM motors also have different size injectors but same impedence. If you use USDM ecu programmed by Jim Wolf you must use USDM sensors. If JDM ecu, JDM sensors.

[jeremymr06]

its the

Are you using USDM o2 sensor or the JDM? USDM will be the correct one to run. Have you tried adjusting the idle screw? The Air Idle Control Valve may need replacement.

JDM motors run different voltages from ecu to temp sensor, MAF & o2 sensor. JDM motors also have different size injectors but same impedence. If you use USDM ecu programmed by Jim Wolf you must use USDM sensors. If JDM ecu, JDM sensors.

right now its the skinny O2 sensor which is jdm.i replaced the temp sensor the other day,what should the maf voltage be around at idle...?

im installing the wideband tonight. im using the narrowband emulator wire instead of replacing the stock O2 sensor.

car was running lean but i will know for sure tonight, i was running the wideband after the cat before... so...

will post results later tonight when i get it in and see what its running at.