Car Is Holding Back.

[RB20DET_Silvia]

Hey guys,

Got a new fuel pump last week car runs perfects then this week i have the same problem i was trying to get rid off for quite some time.

From 2nd to 3rd gear my car splutters and has like a one second delay then has to build up boost again.....also if i rev my car all the way out it hits about 4500rpm then the car climbs up the speed extremely slow like some on has grabbed it around its neck and is choking it.

When my car did run perfect it was extremely fast now its slugish.

I did a ECU test and it comes up saying "34" Knock sensor but i dont think this would be the issue?

I got a RB20det in my silvia with a front mount, BOV, Pod, Splitfire coilpacks, Iridium Sparkplugs, 12psi, 500HP fuel pump brand new and also a turbo smart boost-tee manual boost controller they ones u wind...u think that could be the issue?

What do u think it could be.

Thanks guys please help.

- Luke

Edited December 24, 2005 by RB20DET_Silvia

[nuR.spec]

hey mate - i have a CA s13 and i have the exact same problem - i've rectified all portions to the point where my ECU is spitting out code 55 but still no go It feels like it's starving up top end yeah?

[RB20DET_Silvia]

Yep mate,

Thats it it drives very slow under full load.

- Luke

[RB20DET_Silvia]

Please guys help.

- Luke

[Kaido_RR]

it might be fuel-cut or boost-cut, when it hits 4500rpm does it just lose all power all the sudend and fell like the car is going to stop?

are you running a stock ecu?

[RB20DET_Silvia]

stock ECU,

problem went for a week then came back?

- Luke

[maximumrpm]

i have the same problem with my r33 s1 gtst...im also trying to find the problem...i have also been told that it could be the knock sensors

[PlasticStan]

I did a ECU test and it comes up saying "34" Knock sensor but i dont think this would be the issue?

<{POST_SNAPBACK}>

If the ECU is getting error 34, then the knock sensors are either unplugged or faulty. This means the ecu will be using the safe fuel and ignition maps, this means retarded ignition and rich fuel mixtures so that will be why your car feels so slow.

I would check the connections for the knock sensors first, could just be unplugged or need a bit of a clean. If not then you will need new knock sensors.

[maximumrpm]

how much does it usually cost to replace them PlasticStan?

[RB20DET_Silvia]

Where do u find the knock sensors on the RB20DET and how much for new ones?

- Luke

[maximumrpm]

they are under the plenum....not sure how much to replace...im in the same situation as you

[nuR.spec]

My ECU was coming up with code 13 which was the Engine Coolant Temperature Sensor - i read up further on it and it seemed to be controlling the amount of petrol flow depending on the car's temperature.. I checked the plugs and they were cooked..So i rectified it and ECU came up with code 55 but the car still stutters/starves up top end..

I remember someone saying that one his tuners grounded one of the ECU pinout's as a 'temporary' fix..which? I have no idea..

Im going to get my car put on the dyno to diagnose the problem..I'll let you guys know how i go..

RB20DET Silvia - i suggest you check your plugs/sensors as they may have corroded etc; over time..As a rule of thumb, as soon as the ECU comes up with a fault, it should be looked into ASAP and not be put into the "but i dont think this would be the issue" bin

Merry Xmas

[RB20DET_Silvia]

I checked my knock sensor its plugged in....unsure if its f**ked or not....i unpluged the wire to it car ran a little better but still held back some what....so will have to get some quotes tomoz.

- Luke

[nuR.spec]

let us know what your quoted on Today i replaced my cat with a straight pipe, but still no avail.. I tried another ECU, no go.. Played around with the TPS a little, no go

Just waiting on this dyno run..

[RB20DET_Silvia]

Ok mate....try unplugging ur's it helps a little but problem is still there!!!

- Luke

[MR SLY]

i'm having the same on my skyline r33 s1... it's been going on for about 3 months now.. feels like the car has it's hand brakes on! i've tried everything! but still nothing. problem is still there! it's annoying not knowing what it is.....

hey just wondering how do you find out the ecu thingy. coming up with numbers??? the codes i mean..

thanks

[RB20DET_Silvia]

go to www.rb20det.com for code meanings..... still have problem aswell.

- Luke