Hesitation under WOT..HELP!

[Enemigo]

Well, once i gas it up hard, the car hesitates and will start popping. If i gradually get on it, its fine and goes. Some people say it could be the TPS, but i dunno what procedures i should take. What is everyone setting thier TPS to.

BTW, its an S13 with SR

Jose

[HaLo]

Check your coilpacks. I had a similar problem.

[sepulchral]

99% chance its ur fuel filter, replace it - takes 5 minutes, i had the same EXACT problem, its the FUEL FILTER

thatll cost u $50 u can wire to me western union

email me [email protected]

[sepulchral]

my old filter had mud and shit in it, they go bad when theyre being shipped with the SRs. replace it, my newfilter i bought from napa for $15.00
:D

youll get worse milage now tho cuz ur filter aint clogged once u replace it. alot faster tho.

[Enemigo]

99% chance its ur fuel filter, replace it - takes 5 minutes, i had the same EXACT problem, its the FUEL FILTER

thatll cost u $50 u can wire to me western union

email me [email protected]


Can you explain to me the problem you had exactly?

Jose

[sepulchral]

it got worse and worse

i would get on it sometimes and at 5000rpm or so sometimes earlier it would go POP popop instant power loss like a fuel cut to the motor

it got worse and worse i changd plugs, timed motor, and out of curiosty took off fuel filter and mud came out

fixed it car has never ran better

[Enemigo]

Would you be able to give me a quick write up on chaning the fuel filter? I just want to make sure i do it correct.. thanks alot!!

Jose

[phatkorean]

Get yourself a Chilton's repair manual. It shows you how to do it in there. You should be able to get one from any automotive shop, i.e. Pep Boys. It's as easy as replacing an air filter.

[HaLo]

I still believe it's a defective coil-pack.

[sepulchral]

Take a good look at your engine bay, next to the Intake manifold there is a little canister the side of a jello pudding cup with two nipples, one goes up one goes down. THAT IS THE FUEL FILTER

A rubber hose goes to each nipple with a tiny clamp held by a screw at each end holding the hoses tightly to the fuel filter nipples.

i dont mean to sound weird by saying nipples alot but its what they are.

loosen screws that go to both clamps on up and down side get a towel and put it around the fuel filter and pull hoses off, gas will come out don't worry it evaporates and its healthy.

put new filter on with the correct direction pointing up and put hoses back on re fasten clamps

start car

u may have to give it gas as u start it

let it idle for 5 minutes

ride out

hope it works!

[Enemigo]

I'm gunna try today.. Is there a specific part number when i go to NAPA and get the fuel filter?

jose

[sepulchral]

i heard u changed it and it didnt work?

clean the MAFS
have sparkplugs checked and gap them at 0.32

try and use somone elses coilpacks see if that fixes them

Do you have an aftermarket fuel pump? if not GET ONE if so it could be fucked up.

make sure ur fuel lines arent kinked, get ur car on a lift or something

let me know whats goin on

[Enemigo]

how did you you hear that it didn't work? I will check the coilpacks. Do you think it might have something to due with the TPS?

Jose

[sepulchral]

could be it could also mean ur fuel pressure regulater is going bad (FPR)

if any of the stuff i told u doesnt fix it take it to a friends shop or somone u know get an "expert" opinion.

its like a fuel cut right?

[Enemigo]

any other stories? Has anyone head this problem before?

Jose

[steve shadows]

Well, once i gas it up hard, the car hesitates and will start popping. If i gradually get on it, its fine and goes. Some people say it could be the TPS, but i dunno what procedures i should take. What is everyone setting thier TPS to.

BTW, its an S13 with SR

Jose

maf wiring , take off the shrouding and trace the wires back into the harness, then separate them and tape them off, then check the connections from the ecu to the ecu plug.. :newbie:

[Enemigo]

Thaks for the info, i'm gunna try that today....but just FYI, far from :newbie: , check the reg date, i don't have to be a post whore to be recognized :D

Jose

[jtt220]

I had the same problem, it was a dirty maf sensor. I just pulled off the filter and sprayed it (the sensor hanging down in the middle of the sensor casing) with carb cleaner. Let it dry then put the filter back on. Problem was fixed. This is a common problem when you use an open element air filter...

[Enemigo]

I'm gunna try that tomorrow!.. Any specific Carb Cleaner?

[steve shadows]

Thaks for the info, i'm gunna try that today....but just FYI, far from :newbie: , check the reg date, i don't have to be a post whore to be recognized :D

Jose

ive been in the sr game since 02, when i turned 18. and i was in the honda touge scene before that for 2 years, runing downhill in pv. reg dates are gay too :mepoke: :duh: :bite: lol

[jtt220]

I'm gunna try that tomorrow!.. Any specific Carb Cleaner?
just any cheapo brand will do...use it liberally.

[sepulchral]

fix it yet?

[Enemigo]

ive been in the sr game since 02, when i turned 18. and i was in the honda touge scene before that for 2 years, runing downhill in pv. reg dates are gay too :mepoke: :duh: :bite: lol


I really don't wanna keep going on with this.. but just to let you know, "ive" been in this game for 7 years. I lived in Okinawa and Shinjuku Japan for years. I know the game in and out. I'm just not a mechanic, i let my buddies take care of that. So now that i'm learning, i look for help, not a lower sense of confidence.

sepulchral: I'm trying my best to work it out, its just kinda hard when your learning.. I also have a FWD SR which seems to be different than this RWD SR. Plus the FWD is a Roller Rocker..

Jose

[240-porkchop-sx]

This sounds like the prob i had with my old 90 Ka...the end problem was a cracked spark plug wire. What happend is as the car warmed up the rubber expanded and created a bad connection with the plug, causing it not to fire/ or fire very poorly. Just take each plug wire out and have a look for any cracks.

if you haven't done this yet, give it a try.

cheers!

[steve shadows]

This sounds like the prob i had with my old 90 Ka...the end problem was a cracked spark plug wire. What happend is as the car warmed up the rubber expanded and created a bad connection with the plug, causing it not to fire/ or fire very poorly. Just take each plug wire out and have a look for any cracks.

if you haven't done this yet, give it a try.

cheers!


also check your distributor (for moisture) and other crap

[Enemigo]

Thaks for all the help. Here's another question.. What the cons of the car running a 12 or 13 degrees as afar as timing is concerned? I know the stock timing is 15.. Would it be wise to raise the timing to 16 or so? The person who previously owned this car has the timing set to 12 or 13. I Believe this can be the cause of my problem.

Jose

[G_Fish240]

hey Enemigo, does it happen to you every single time? or random times, my friend is having the same problem like if he goes WOT it hesitates then goes on a s13 sr20det but it only happends sometimes and usually after he has been driving for a little whilte, just wondering so if you fix your problem i can relay it to him

[Enemigo]

It could be the timing... It happens everytime!!

Jose

[ItzGenX]

My SR used to missfire like a mofo over 5psi of boost (seemed like a rev limiter). I had to let off the gas and push it softly again and it would go away. The problem for me has happened so long that I've tried different plug gaps etc and still no go. What it was, it was a bad coilpack not being able to spark the way it should (weak). I tried things from retarding the timing (makes it worse, cylinder pressures are higher during spark when retarded). What made mine go away temporarily was to advance the timing to like 22 degrees (not recommended) until I got time and money to get new coil packs. The reason it stops doing it when the timing is advanced is that it will fire a spark before cylinder pressures got up too high for it to fire. I got the Splitfires and never had the problem ever again. I even run a .050 plug gap on 1 bar of boost and still no miss. Great low end power with a larger gap too. In your case, you have a fwd sr20 so it chould be wires, distro cap/rotor, spark plugs, mafs, or fuel pressure. It sounds to me it is more spark related (advance your timing from 13 up to 15 and see if it helps some).

[Enemigo]

My SR used to missfire like a mofo over 5psi of boost (seemed like a rev limiter). I had to let off the gas and push it softly again and it would go away. The problem for me has happened so long that I've tried different plug gaps etc and still no go. What it was, it was a bad coilpack not being able to spark the way it should (weak). I tried things from retarding the timing (makes it worse, cylinder pressures are higher during spark when retarded). What made mine go away temporarily was to advance the timing to like 22 degrees (not recommended) until I got time and money to get new coil packs. The reason it stops doing it when the timing is advanced is that it will fire a spark before cylinder pressures got up too high for it to fire. I got the Splitfires and never had the problem ever again. I even run a .050 plug gap on 1 bar of boost and still no miss. Great low end power with a larger gap too. In your case, you have a fwd sr20 so it chould be wires, distro cap/rotor, spark plugs, mafs, or fuel pressure. It sounds to me it is more spark related (advance your timing from 13 up to 15 and see if it helps some).

I have an S13 with SR20DET.... I think you were talking about my Sentra which is FWD SR.. But thats my other car.

Jose

[sepulchral]

time ur car to 15 degrees. you have a fuel cut of some sort, could be clogged injectors, i reccomend running that fuel system cleaner shit that may unclog the injectors or taking an injector out and examining it.

[Enemigo]

You know, i have a strong feeling it can be the timing.. If i put it back to 15 then it should be fine.. Although i did check the spark plugs and they were gapped to .45, i bumped them down to .35

Jose

[sepulchral]

you should describe in full detail the nature the noise what the engine does when it happens all that shit about your problem and even get a sound clip even or something to let me better diagnose the problem

what type of fuel pump do you have? did u put it or have it put in yourself?

when you took out your plugs did they have anything on them like green from coolant or anything?

[Enemigo]

you should describe in full detail the nature the noise what the engine does when it happens all that shit about your problem and even get a sound clip even or something to let me better diagnose the problem

what type of fuel pump do you have? did u put it or have it put in yourself?

when you took out your plugs did they have anything on them like green from coolant or anything?

The sound is like a popping and boggeling under heavy acceleration. If i gradually accelerated it would be fine. I don't know how to describe the sound. Its just like the car feels like its holding back, everytime it makes the popping sound the car loses power. As far as the plugs, when i pulled them out, the tipe were like a light gray color.. not quite white, but a light gray. I know t\white means lean, do you think by having the timing set at 12 would make the car run lean? I also have a Walbro 255 pump. it was installed by a shop when the whole DET was swaped in.

Jose

[soon2be240]

check for IC piping leaks

[sepulchral]

ic piping wouldnt mean shit your car is getting air, i think your FPR has gone bad or your injectors are clogged, fuel line is crimped or clogged some way.. have u tried taking it to a shop and getting an expert opinion... thats the exact prob i had and fuel filter fixed it

also what condition is your MAFS in?

THE PROBLEM IS IN THE FUEL SYSTEM keep timign set at what it should be!

[sepulchral]

i would go to the shop who did your swap and ask them to look over it, it shouldnt be a major problem.


also: does your oil smell like theres gas in it?

if so then your fuel pressure regulator needs replaced shouldnt be more than $150 installed by a shop

[soon2be240]

my brother had leaks in his IC piping and it would buck and stutter if you got on it hard, but if you did so gradually, it wouldnt do it...these sound like the same symptoms as his

[sepulchral]

then check ur piping for leaks