rb20det developments and problems

Post by **goofynick6** » Mon Apr 12, 2004 4:22 pm

Knock sensor codes really make the car run like crap..happened on my buddy's KA and we ended up swapping ecu's to fix the problem and then it ran great.

Nick

Post by **GTR Shop** » Mon Apr 12, 2004 4:22 pm

Pull the knock sensorplugs and see how it runs..

Post by **HybridOne** » Mon Apr 12, 2004 4:22 pm

i am going to pull the knock sensor plugs later today. The car still runs like crap though. I switched the O2 last night and reset the ECU, and it didn't change a damn thing.

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

IF ITS NOT A LEAK OR VACUUM PROBLEM WOULD A STANDALONE CLEAR UP ANY ECU RELATED PROBLEMS?

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

I'M USING WALBORO 255LPH FUEL PUMPBLOCK HAS GOOD GROUNDIGNITOR HAS PROPER GROUNDINTAKE MANIFOLD WAS PULLED OFF, CLEANED, AND RE-SEALED (CHECKED FOR LEAKS AND THERE IS NONE)ONLY THE MAF AND O2 SENSOR PLUGS WERE CUT AND EXTENDED.I HAVEN'T CHECKED MAF VALUES YET.

Post by **HybridOne** » Mon Apr 12, 2004 4:22 pm

P.S. are you running a coal canister? cause i'm not.

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

I TOOK IT OFF AFTER EMISSIONS... IT WAS DOING THE SAME THING WITH AND WITHOUT IT THOUGH.

Website · Post by **frosted flakes** » Mon Apr 12, 2004 4:22 pm

i dont think carbon canister has anything to do with it...i dont have mine and mine is idling fine at 650rpm....good luck guys i really dont know what your guys problem is...

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

WHO HAS THE POWERSTEERING PUMP HOOKED UP? I WONDER IF THE ENGINE IS TRYING TO COMPENSATE FOR LOAD..... ITS JUST A GUESS.

Post by **HybridOne** » Mon Apr 12, 2004 4:22 pm

i'm running my power steering pump...but i didn't connect the power steering pump signal wire. It is suppose to up the idle when the pump is in use. But since it isn't hooked up, it shouldn't be upping the idle.

Post by **GTR Shop** » Mon Apr 12, 2004 4:22 pm

We don't use the load sence for power steer.

Check your fuel pressure.. I think you'll find its up!The std regs can't bypass the fuel of a big fuel pump.

Post by **rbsileighty** » Mon Apr 12, 2004 4:22 pm

What is standard pressure? His is running (hybrid) at about 3 bar static pressure.

Post by **GTR Shop** » Mon Apr 12, 2004 4:22 pm

Std FPR? 3bar with the boost compensation hose off and the key turned on to prime? making 3bar when it primes?

Post by **HybridOne** » Mon Apr 12, 2004 4:22 pm

boost compinsation hose off? I make just above 40psi at idle.

Post by **GTR Shop** » Mon Apr 12, 2004 4:22 pm

You will have a vacuum hose going to the reg.. pull that off, hook up your gauge and then turn key on.. pump will prime and you will see what your base is.40psi at idle, witht he hose on is too high.. you have a big pump also?

Post by **f150intally** » Mon Apr 12, 2004 4:22 pm

I know this may be far fetched, but have you check to see that your throttle plate is closing completely. I know a couple of guys that had to adjust their throttle cable. It was being held open ever so slightly at idle causing it to idle round 1200rpm. No matter what they did with the idle screw, it would not go below that figure.

Till they adjusted the throttle cable. Then it idled perfectly since the throttle plate wasn't cracked open.

Just a thought.

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

Any more ideas cause I'm fresh out!?

Post by **Carl H** » Mon Apr 12, 2004 4:22 pm

if the ecu says that its all good then perhaps its the injectors.i would pull the injectors and have them cleaned and see if thats the problem.what about fuel filter?if its never been changed then it will most definately cause hesitaion as they do get clogged.change it out to a 300zx fuel filter, works fine.try the filter bit out first then the injectors, else i have no idea.mebey a damaged MAF.*edit*come to think of it it probably is a clogged fuel filter.i had a friend who had a honda prelude that wouldnt rev past a certian point no go above a certian speed.replaceed the fuel filter and all was good.

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

I HAVE ALL NEW FILTERS ON THIS CAR (300ZX OIL AND FUEL FILTER).THIS CAR ALSO HAS A NEW FUEL PUMP (WALBORO 255LPH)THE INJECTORS ARE ALL CLEAN WE CHECKED THEM HERE AT WORK AFTER I SEAFOAMED THEM.THE MAF IS A-OK.

THIS LIMITER IS A SPARK CUT SO THE COMPUTER IS CAUSING IT. YOU CAN TELL ITS A SPARK CUT BECAUSE ITS IMMEDIATE AND WHEN SPARK COMES BACK ON, THERE IS A HUGE FIREBALL OUT THE EXHUAST.

I WILL TRY ANOTHER FUEL FILTER BUT I DOUBT ITS IT....

Post by **GTR Shop** » Mon Apr 12, 2004 4:22 pm

WHats your fuel pressure with the compensation hose off on the reg??

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

WE HAVEN'T GOT THAT FAR.....

I'LL CHECK THAT TONIGHT AFTER WORK.

BTW: WHATS THE COMPENSATION HOSE?

Post by **JonPowell** » Mon Apr 12, 2004 4:22 pm

Goes from the manifold to the regulator

Post by **GTR Shop** » Mon Apr 12, 2004 4:22 pm

Check the pressure with just prime.. not running idle pressure.

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

OHH OK ITS THE VACUUM LINE TO THE REGULATOR.... I'VE JUST NEVER HEARD IT CALLED THAT BEFORE.

Post by **WDRacing** » Mon Apr 12, 2004 4:22 pm

Did you ever set your TPS? Have you messed with the IACV screw?

The stock fuel reg mixed with the 255 pump should be fine. I ran mine like that for years. Unless your reg is just bad.

Check that fuel press on prime and idle. Have you posted this on SDU??

WD

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

How do you set the tps? I've tried everything in the manual related to timing and idle but I just want to know if I missed anything.

I've been playing with my IACV screw and right now its fully closed and its the lowest idle its been at.

I'll post on SDU and SAF.... I rarely ever get a response from anyone on those forums though.

Post by **WDRacing** » Mon Apr 12, 2004 4:22 pm

Really?? I got a ton of info from SDU over the last couple of years...although I haven't posted there for quite some time.

I don't remember the voltage settings for the TPS off hand, but if you run a search on SDU it should lead you to the right place.

WD

Post by **PROJECTRB240SX** » Mon Apr 12, 2004 4:22 pm

OHH YEAH I HAVE CHECKED AND SET THE VOLTAGES ACCORDING TO THE FSM.

YEAH I GUESS THE SDU GUYS DON'T LIKE ME MUCH!?

Post by **OmniProbe** » Mon Apr 12, 2004 4:22 pm

Is it working fine now? maybe your injectors maxing out due to the airflow coming from the fmic?

Post by **oreofreak** » Mon Apr 12, 2004 4:22 pm

Try buying a brand new O2 sensor and replacing it. It sounds like your car is ecu stuck in a low octane fuel map on the computer. A bad O2 sensor can cause this. Your computer cannot go into a closed loop mode if the sensor is bad.

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