tinmann55

iTrader: (1)

Hi, need some advice on this SE i am bringing back from the dead. Car sat for 7 years before i bought it from the original owner. taken out of service for oil cooler leak. I will list what i have done to eliminate alot of bs. new air filter ,plugs,plug wires,fuel filter,complete RB streetport exaust,removed acv,new rb block off plate.removed airpumb and belt. I did the atf trick and slowly brought the rotors back to good compression. Started and ran fine but had a hesititaion at 2500 and sometimes 3000rpm. idle was fine around 800rpm. So i turn the rotors and put new pads on the front and get ready for a test drive yesterday and while shes warming up it starts the se up and down rpm thing i had read about in the faq section on SE's. So i oil up the throttle shafts and switch out the vent and vacum solenoid valve with a spare set i have just in case and that clears up that problem. So now i am back to reving up through the rpms and hit the same wall at 3000rpm then it drops to 2500rpm wall,it revs up smooth to the wall and then it just drops off. but the idle is fine now so i am guessing it is a vacum leak or injectors are plugged up and need cleaned. one other thing i did was upgrade to the 2gen fuse box. The fuel tank was empty when i went to drain all the fluids in the driveline, so i took some new gas and ran about a gallon through the tank with the plug out and watched it carefully for debri. but it ran through clean.The po said the only thing he had done to service the car was oil and filter changes, and nothing else,122,000 miles. I have done several searchs in the faq section for hesitation se and havent come up with very much. i have a set of injectors i just got back that have been cleaned and tested. Thinking about spending tomorrow putting them in. Any help would be appreciated.

bugman1973

i bet your 6th ports are sticking. feels like you hit a hard wall in the engine and then it will go past it if you let it. i suggest taking off your UIM and you LIM and just pull the ports out to see how gummed up they are. if you are gummed up i would clean them out and put some sea foam in the gas tank fill the take all the way up go for a lengthy drive and run all the gas out and check your hose that comes off of your exhaust for you port activation is hooked up before you do all this. have fun rotoring

trochoid

iTrader: (6)

Injectors will not stopworking at any certain rpm. If they're having problems, it would be all the time. To check the 6-pprt operation, put a dab of grease on the actuator shafts, take it for a drive and see if it's moved. Or, iirc, you can free rev and you should see them move.

I take it you haven't driven this yet? Will the engine rev past the 3k rpm spot or is that the limit? Since you've replaced the fuel filter and drained the tank, the pickup tube may be blocked inside the fuel tank, or it's the pump, which also has a screen filter. You might want to do a fuel volume flow test as per the FSM.

If none of these work, doc should have some suggestions.

tinmann55

iTrader: (1)

Thanks guys i will check several of these today. Trochoid ,no i have not driven it on the road,i dont trust it yet & no insurnace yet, and yes 3k is the limit might have hit 4k one time. I had thought of sixports but it got lost in all the mutilple thoughts an old fart has.bugman, yes the sixport tube is hooked up to the header correctly, I have disassambled several S5 motors and the sixports in one where gummed up bad. I think i will try that first as it is a good excuse to put in the cleaned injectors. I will also check the screen in the pump. Po had the tank drained ,it was empty or dried up.I cant wait to drive it, sweet car and never been jacked with.

bugman1973

what i did to clean my s4 ports out was a combination of Seafoam and MMO great stuff. question you said you replaced the fuel pump? try that also with the s5 what ecu harness are you using are you using the full s5 uim and lim? or you the s3 on like i did and only ran 2 injectors. or are you using 4 injectors if not s5 ecu which one are you using?

tinmann55

iTrader: (1)

Huh? no i never said i replaced the fuel pump. Just the fuel filter. Like i said it is a stock SE 13B all original except for RB exaust i put on and also i removed the acv assembly and added a blockoff plate.. s3 lim&uim stock,2 stock injectors. motor has never been touched.

I went up today and visually watched the 6ports and reved the motor and they never moved. i tried to manually move them front moved down but would not come back up ,rear wouldnt move so i will pull the uim & lim and pull them out and clean them. motor will not rev past 3.5k at all even if you try it slow it just falls off ,thats why i think its fuel.

Rx-7Doctor

iTrader: (13)

Check the fuseable links at the fuse block on the strut tower for the injectors. I would just pull the ones that power the headlamps(assuming all the functions for the lamps work) and try those in the injector spots.

bugman1973

they will not move unless the car is under load for some reason you could try putting wd40 in to the hose that goes in to the ports do it a few times that will free them up a little bit.

trochoid

iTrader: (6)

While not opening under load is true for the secondary ports on a Nikki carb, it is not true for the Aux ports on the NA 6-port engines. These are opened by back pressure from the exhaust on the S3 and S4's. Load has nothing to do with it, merely the increased back pressure should open them.

tinmann55

iTrader: (1)

update, I have it tore down to the block. all the runners and sixport sleeves are covered with stickey black gooey carbon? anyway soaking everything in carb cleaner and i have a heated parts washer so i am cleaning everything now. One thing for sure po lied to me big time. the front injector plug had both wires spiced with connecters where some hamfisted fck tore off the injector harness wires duriing disasembly. connections looked ok but i am wondering if this might be a contributor to the problem,now that i know somebody has been in there mucking about everything is suspect now so i am checking all vacum hoses carefuly. injectors where fairly grungy so in hindsite i am glad i broke it down.I have done this once on my 91fc to replace injectors so this is fimilar territory for me.

Jeff20B

iTrader: (13)

Add a better engine ground too.

bugman1973

while you are at it you might want to check the ecu to see if you are getting the right signal on ports h and m i think i could be wrong check the fsm for the ecu check stuff and what signals you should be getting out of there as for as a voltage its been a while since ive messed with it sorry i could go find all my randomly placed stuff.

tinmann55

iTrader: (1)

Ok i have removed uim lim and cleaned and lubed the aux port valves,and coated them with mmo, reving the throttle now causes the valves to push out rather then turn. Thinking maybe i had installed them upside down i took everything back off but they where correctly installed / \ with the large part of the dowel pin at the bottom.Now they turn freely,I assembled and tried again ,same thing port valves want to push out not turn. I even put a new hose on to make sure i was getting vacum. I also changed out the afm with a spare i had and added a new ground wire to the engine.Also checked the dist for vacum and adjusted. I can get it to rev higher now but the limit is 6k I wonder if anyone else has had vacum problems with the RB streetport exaust system. I also upgrade to the second gen fuse box and did away with the fuseable links.I am ready to just remove the aux port valves and just run without them. i have driven it on the road now and get the same results. if you try to accelerate it just goes hits the wall and goes flat.Thinking also of using S5 uim and lim i have but after searching i cannot find a complete writeup of how to do it. I have a spare SE computer ,guess i could put it in.Help please.

uptotibet

sucks...

tinmann55

iTrader: (1)

I just wanted to finish off this thread so anyone having similar problems will know how ,and what resolved this. I called racing beat about the streetport exaust and to get there response on the problem. they said change out the auxilary 5th and 6port acuator diaphrams. I had checked them already for sound and air as advised by trachoid and they seemed fine . I took of the se actuators and replaced them with a set of spare S4 actuators i had laying around and also put new gaskets on and a new vacum line from the header to acuator supply line. That solved the problem and it now revs freely and runs great. I cannot say if the gaskets,or the acuators fixed it as i did both at the same time. The old se acuators squish and blow air fine if pushed by hand,thanks for all the input. SE power band =sweet!