Help with SR accelerating issue!

[duffman1278]

Well my problem is that I can't seem to accelerate my car without "pumping" the throttle. If I just go from closed throttle to wide open I can't seem to get the car to accelerate, even at idle.

Its an S13 SR redtop370CC injectors

I replaced my MAF and am able to rev all the way to redline with ease.I also checked my TPS, and its set at .37V closed.I replaced the injectors with new ones from DW because there was always a cyclinder that kept flooding, even after changing the o-rings.I've checked my timing at least 4 times already.My vacuum is at 15Hg

I checked for boost leaks already with a boost leak tester and fixed the leaks. I dunno what else to look for really, so any suggestions would help.

[homeslicej2]

how much fuel pressure are you running? Sounds to me that you are running too rich at WOT and are bogging. By pumping do you literally mean pump or just pushing the throttle in stages (1/4 throttle, 1/2 throttle, etc.)? What's your fuel setup? just the new stock-sized DW injectors and a Walbro?

[duffman1278]

The fuel setup is 370CC injectors with a 255 walbro

By "pumping" I mean that if I turn the throttle back and forward quickly, I can rev the engine enough to keep increasing the RPM's until I get to redline.

I don't have a gauge installed on my fuel line, but I guess I'll hook one up to it.

[homeslicej2]

By "pumping" I mean that if I turn the throttle back and forward quickly, I can rev the engine enough to keep increasing the RPM's until I get to redline.

that is weird.

[duffman1278]

I turned on the car for awhile today after making sure my IC tubes were nice and tight, and also that the vacuum lines were tight. However, it was still the same results. hits 3500RPM at full throttle and wont pass that unless I "pump" the throttle.

When I got back home though, I took out the spark plugs from the cylinders and noticed my number 2 cyclinder was STILL flooded, and seemed a bit worst. I could smell some fuel in the oil, so I'll be changing the oil for that before I drive it again. btw, I allowed tried allowing my cyclinder to evaporate the fuel by pulling out the spark plug for a whole day, doesn't seem to really go away. My other cylinders are dry, its just that number 2.

I'll be making a fuel pressure gauge this week to hook up to the fuel line and see what I'm at.

I also readjusted the TPS to .4V closed. It was at 4.0V at WOT. But that was BEFORE I took it for a drive.

[duffman1278]

Alright, so I didn't get to turn on the car today but I turned the key all the way so that the fuel pump came on and I took a pic of the pressure in my fuel. I dunno if this helps but tomorrow I'll take another one with the car on. The second pic shows you a clear view of the gauge numbers. Mine was over 40 but I believe under 45psi

[blinker_fluid]

Does it idle smooth? When u accelerate does it just bog or start bucking?Try back probing a test light to that injector to see if its getting a pulse signal from the ecu also make sure the spark plug is firing.

[duffman1278]

I have tested for spark by actually grounding the coil with the spark plug and having a friend crank the motor. I could see the spark.

It does idle smooth, with no problems. When I accelerate it stutters, not too sure what bucking is. but yea it LAGS like crazy and wont pass 3500RPM at WOT. Revs to redline though so I know its not the MAF

[TeamTorqueJuggernaut]

Mine does almost the same thing. It depends on how much boost im running. If im on stock boost it will run to redline fine, but if I change it to 10psi it wants to buck like crazy. When I just ease into it, then it will hold 10psi fine. Im leaning toward plugs being messed up. Also I smell gas when I stand behind the exhaust.

[duffman1278]

According to my boost gauge, I'm running 5 psi, but I can't even ease into it to get to redline.

[duffman1278]

So today I cranked the motor a few times without the fuel pump on to try and get out the excess fuel. After that I blew some air into the cyclinder to dry it up.

I also changed my vacuum lines with brand new ones but now the car wont even idle anymore!

I noticed that my fuel pressure when I pumped the throttle from the engine bay, was going from 39-40 psi. I dunno if thats normal?

I'm uploading a video right now which I'll post up asap.

[duffman1278]

Here's the videohttp://s5.photobucket.com/albu...9.flv

[duffman1278]

I readjusted my TPS so that it was .32V closed throttle and the idle was perfect, it went back to normal HOWEVER, when it was running, I decided to pull each injector plug individually and I noticed that as I pulled them, all but the second cylinder were were causing the engine to turn off. When I unplugged the second cylinder injector, the engine ran normal at idle, as if I did nothing to it.

[DOHC20sr]

do you have access to another ecu to try? you may have a bad driver on #2. that sounds simular to what happened to a friend of mine.

[duffman1278]

No, I've been trying to get a hold of one, because I don't want to buy one.

[duffman1278]

Alright can someone verify if this is the pin to check for continuity from the 2nd injector to the ECU?

[duffman1278]

Just for anyone who might search this in the future, the problem WAS fixed. Swapped out the ECU's and she runs SMOOOOOTH, with no more hesitation or any issues as of know. YAY!!

[sr28]

i had the same thing until i changed my plugs.. i went through like 3 sets in 2 months..check the plugs

[duffman1278]

Uh...don't wanna sound like a d!ck, but did you read my last post?? Problem was solved