Rb20det no power under load wtf? YES I HAVE SEARCHED

[nismo13s]

what up! I recently got my rb20det running again and i have ran into a problem. whats happening is when i put the car in gear and try to go, I have no power. the car idles strong and will rev good but as soon as i put a load on it, I will want to bog and stall and wont go past 5mph. has anyone had symptoms like this before? any help is appreciated. thanks for looking.Eddie V.

[Kansei240sx]

Boost leak?

Check all your Intercooler Couplers and Pipes, and make sure all your clamps are tightened. I just woke up so thats all that comes to mind right now.

[Bluefire]

Explain what you have done to the car... we need more details on your setup and what has been modified... condition of motor... etc...

-Bluefire

[Carl H]

what does the timing look like?

[nismo13s]

ok, well the motor is a 94 spec rb20det all stock. the only thing i added was a fpr(all my fuel lines ARE correct). I checked my base timing and it is dead on. as far as remeber all my intercooler piping was tight, but i'll have to check it for leaks. that about it, i dont know what else to check. i have checked everything else that I know of. again any help is appreciated.

[Carl H]

whats base timing set at?have you checked it?

[nismo13s]

I checked the timing at the crank and the cam pulleys and that was dead on. I have not set the timing with the cas but i guess i would do that next right? it pretty close to where it should be. it starts and idles fine.

[Carl H]

you still havent answered the question, what is the timing?5* 10* 15*? a bunch of bannanas?one load of potatos?saying you checked the timing and its right on doesnt help anything without numerical values...

[jdmser]

You do know that ignition timing and crank/cam timimg are two different thing, right? Carl is asking what your ignition timing is at, not if you put your timing belt on right. Get a timing light on it and adjust the cas.

[nismo13s]

Timing is at 15btdc.

[Carl H]

then has to be part of the intake track thats loose...then maf then ect but after that im not sure.could possibly be ignition but go after that after testing all other possiblities.boost leak the car and see whats up.

[nismo13s]

ok, well no luck so far. we have checked every thing. here is what we did*check and set timing to 15btdc*set tps sensor to .45v closed.*cleaned acc valve*replace coolant temp sensor.*swaped ecu from a known good running rb20det*swaped in a known good ignitor from running rb20det.*check maf per fsm, SEEMED to be in good shape.*check for air leaks, none found. tightened all clamps.so that everything we have done. when we swaped in the good ecu and ignitor nothing change. still ran like ****. we still have to start it with carb cleaner and still wont rev over 3k with a load on it. does anyone have any suggestion on what we should do next. we are going to go over the cold start wiring again but im pretty sure that is correct. any suggestion on what could cause a no start when the cold start wiring is correct? the only thing i can think of that could cause the no power issue is the maf could be bad. is there anything else i havent checked? any input is appreciated. Thanks for looking.

[Kansei240sx]

MAF

[Chaos the Xile]

Yeah I'd have to say MAF too check the wiring and voltage to make sure that its regestering the air if not you won't be driving the car it'll look and sound good from a standstill.

[nismo13s]

ok, this is weird! well we were messing with car and decided to disconnect the maf and see what happen...the car fired right up with no carb cleaner or nothing. ok so we think it the maf. so a buddy bring his maf over and put it on my car. we go to start it and nothing the car just cranks. then we unplug the maf and the car will not start on it own. its so weird. we think it in the wiring. we will check that later tonight. any ideas?

[Eikon]

this car has gremlins I swear!

The wiring wasn't soldered to well, so Karl stripped it and resoldered. I had to get my 5 month old home to bed so I didn't hear if that helped or not.

The Maf didn't seem to help, but we couldn't get it to run long enough to even really try it.

Could still be some issue with the MAF.. but I am starting to think the fuel pressure regulator may be an issue.

It's really loud!!! It sounds like it has an air leak or something strange. I've never heard a pressure regulator that is that loud. But, it shows right around 40 psi.. which should be close enough. It might be worth picking up another one... or just taking it off to test.

Whats the history with your car... Did you do the swap yourself? Or did you buy it with a perfectly running swap? What exactly have you done with it since you got it? We need to retrace your steps and start taking things apart to get back to running... then we can re-install properly.

Another observation that we didn't really get to test very well... I noticed an odd sound from your air filter/Maf region the other day when the car was idling. When giving it gas, the airflow of course increased, but then it would make a strange sound just as it started to choke out... It almost sounded like there might be something clogging the filter... I know there's no plastic flap or anything in there... but that was approx. the sound it made... like it was sucking hard enough to close something off.

If I get over there again... I want to take apart the air filter just to check it out.

Anyhow.... looks like were down to fuel pressure regulator or wiring as the culpret. What kind of sheilding do the wires to the MAF require? Have you searched that yet? I know you sent Karl and email with some MAF info.... Like I said, they weren't soldered very well, and they were just wrapped with electrical tape and not shielded in any way.

I'd sure like to get that goofy engine running. When it does... it idles really smooth and quiet. Other than the dumb fpr.

Anyhow... we'll keep working on it.

[Bluefire]

what fuel pump? fuel filter? Do you see the fuel pressure rise a bit as you rev it?

-Bluefire

[Eikon]

Do you see the fuel pressure rise a bit as you rev it?

-Bluefire

we couldn't even get it to keep an idle last night... let alone rev it enough to watch the pressure.