KiLLeR2001

You need a dedicated fuel pressure gauge, fuel pressure will change after the car is warmed up. You'll especially want to see what your fuel pressure is reading around the problem RPM range. I'm not so concerned with the fuel pump but more so the connections / wiring for the fuel pump. A loose ground, wires with high resistance, will cause fueling issues for sure.

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tman6500

thanks for the help will check it out tomorrow and post the results.

tman6500

Driving it around today it might not be rpm or throttle position its different for every gear and sometimes just goes limp in first from a stop

tman6500

Do you mean the ground on the fuel pump like taking it out again? or is there another ground outside the tank?

tman6500

The tps is set to .73 closed 4.23 wot

KiLLeR2001

Not good. You'll want it at 0.45 closed.

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tman6500

So to change the voltage you loosen the two screws and move the tps unit?

KiLLeR2001

Yes, make sure you test the entire range of motion as well. Move it and make sure the voltage continues to go up, if it dips down randomly or cuts out, you may need a new TPS.

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tman6500

Closed its .45 wot 3.97

KiLLeR2001

WOT seems a little low, it should be around 4.45 - 4.55v.

Here's a good article: KA24DE : Checking TPS and adjusting idle : Nissan Articles

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tman6500

set the wot to 4.5 and then closed was .97 now its set to .48 wot 4.04 best i could get it could it be bad it like a month old? It helped but still going it. Going up hill makes it bogs worse.

tman6500

Going to hook up a fuel pressure gauge next.

Nizzan4u2nv

Try swapping in a working ECU.

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tman6500

Well i gave up and a shop now has had it for about about 5 days no luck.

emack240StL

Any word from the shop yet? I think mine is having the same problem that you are describing. I was happening earlier this year, I switched out the mass airflow meter, and the spark plugs and the problem almost completely went away, but now its getting worse again. I'm goning to start testing the advice from this feed, and see what works, but let me know what you learn from the shop.

tman6500

They still have it cant find anything yet

tman6500

Shop called and they ran out of ideas. Great lol now what

emack240StL

I've been doing my research, I havn't had time to start palying with it yet, but one thing I have found that seems to give the same symptoms as we are experienceing is the EGR unit. It can go faulty, or get clogged and cause hessitations. The EGR and EGRV can be cleaned replaced or removed to fix the problem. Like i said i havnt tested it yet but you might want to try it, seems like its getting good results...

tman6500

Checked the egr valve you can get your hand under it and push up on it and if the engine starts to idle bad (which mine did) then the egr valve is working.

Butcher240sx

Did you ever try another ecu?

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Don't Mess With Texas

tman6500

Couldnt get my hands on one to just swap. Might have to just buy one

OutlawLui

Same thing with mine , it was a bad maf plug connection.

Thank god for safe mode

So i cut it off and did this


Like a baws. now it runs perfect

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tman6500

Ya I was thinking about the same thing but didnt because i thought it would have given a code. I will have to steal or idea and give it a try thanks for your help.

emack240StL

I just noticed last night that the air temp sensor on the intake just past the filter was missing the wires/pug that connects to the plug that goes to the ecu. i have the part on order and i'll let you know if that fixes my problem any. if you have and aftermarket intake u might want to make sure that yours isn't like this too. im thinking that when my maf went bad, the shop might have accidently knocked the wires of the sensor and it got lost somewhere and thats why only half of the problem got fixed the first time around in my case

tman6500

Well bought a used ECU and no luck. Also hooked the MAF connecter right to the MAF nothing drove the car around don't see any difference. Wow this is crazy there most just be a loose wire or half broken wire sending a bad signal or something.

Butcher240sx

Start de looming the harness. Wiggle test the connectors with a ohm meter to check for bad connections. I'd start with the Maf and work back. There is a gremelin in there somewhere.

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falling angel

One thing I haven't seen you check, the tps voltage. Does it go up smoothly all the way from closed to full open? I've had this problem, right at quarter throttle the voltage dropped then came back near 3/4 throttle.

tman6500

Set the tps to .48 4.04 with the new on didnt see anything jumping in volts.

CraftHell

Im having the same exact issue wtf..

tman by any chance is yours manual or auto?

tman6500

My car is manual