Page 1 of 2 1 2 LastLast
Results 1 to 10 of 20

Thread: stocko 4age playing up!

  1. #1
    Veteran
    Join Date
    Dec 2008
    Name
    Dave
    State
    QLD
    Location
    Brisbane
    Country
    Australia
    Posts
    2,667

    Default stocko 4age playing up! but problem solved..

    hey folks, got a tech Q for you 4age junkies.

    ok the setup

    -"Jap spec" 16v 4age (as far as i know)
    -jap ecu (definately)
    -rwd loom
    -head reco few months back with new head gasket of course
    -new gaskets everywhere
    -bp ulimate fuel run all the time
    -base timing set to around 15-20 degrees before tdc, doesnt ping
    -fuel system is just an external fuel pump under the back of the car.

    ok the symptoms.

    engine seems to bog down and die, if the throttle is opened quickly. if i build up the acceleration relatively slowly (ie not instantly) the engine picks up well . but if i "snap open" the throttle under any circumstance the engine will cough and splutter for a bit and then sort it self out and continue reving well. the coughing and spluttering is sort of "power surges" it is really quite violent . it is especially apparent when changing gears quickly while accelerating fast. ie...rev out first gear, off throttle change gear, and back to 100% throttle it will cough and splutter violently for a few secs then keep going.

    note the engine starts perfectly fine, and drives great all the time, except for the circumstances listed.

    my initial thought is that the spark is breaking down, the spark plugs are prolly 3 months old and were pretty good condition last time i checked (few weeks back). The spark plug leads are new, not sure on the coil, but i guess that is fine.

    also note i am unsure when this problem started as since ive had the engine in my car i haven't really driven it that hard all that often, its only that ive started becoming more confident with my driving with it that ive noticed this problem. i do know that it hasn't always done it though.

    so if any one has any ideas that would be great! my understanding is that i should be able to stomp on the throttle at any time (within reason) and the ecu should sort things out for me....
    Last edited by ke70dave; 12th June 2009 at 12:00 AM.

  2. #2
    Veteran Robo86's Avatar
    Join Date
    Dec 2008
    Name
    Rob
    State
    QLD
    Location
    Brisbane
    Country
    Australia
    Posts
    2,759

    Default

    mmm my problem was kiiiinda similar. it turned out to be a clogged fuel pump, threw in a 7mgte one and i havnt had a problem since, just something to keep in mind maybe?

    http://shirtstuckedin.com/
    my corolla
    Bosman Wholesale Tyres
    3274 5374 - Roy

  3. #3
    Veteran
    Join Date
    Dec 2008
    Name
    Dave
    State
    QLD
    Location
    Brisbane
    Country
    Australia
    Posts
    2,667

    Default

    hmmm interesting

    i have been suspicious of my fuel pump since i got it (unknown history, which yes i know is a dodgy thing to do)

    i have a 8mm line and a surge tank to put in....im sure it would improve the situation. but there are plenty of guys running just a dodgyvl pump and they seem to run ok.

    thanks for the reply though mate!

  4. #4
    Senior Member KE70's Avatar
    Join Date
    Dec 2008
    Name
    Alek
    State
    VIC
    Location
    Lalor
    Country
    Australia
    Posts
    150

    Default

    I have the same problem but its not my fuel pump as it measures ~40psi upto the rail.

    Let us know if you work it out.

  5. #5
    Veteran Nikkojoe's Avatar
    Join Date
    Dec 2008
    Name
    Tom
    State
    WA
    Location
    Perth
    Country
    Australia
    Posts
    2,260

    Default

    I would check all earths, paying great attention to the engine loom earth bolted to the inlet manifold. Check ecu codes for errors.
    1983 AE86 ADM rust spec goodness track car build - end of the road
    1984 AE86 Silver ADM mk2 daily build - SOLD
    1984 AE86 ADM granny car daily now 4AGZE - SOLD
    1983 AE86 ADM Engine Conversion Slut - SOLD
    2002 IS200 6spd - new daily in progress
    1986 AE86 JDM GT-Apex Levin Notchback ready to roll......

  6. #6
    Veteran slydar's Avatar
    Join Date
    Nov 2008
    Name
    Dimitri
    State
    QLD
    Location
    Brisbane
    Country
    Australia
    Posts
    3,096

    Default

    its unlikely to be the pump.

    you need to put some effort into sorting out a way to read the fault codes, thats my main advise.

    the fuel line size is fine. 1/4" is big enough. checking the earths is a good idea. the main one on the engine loom is usually bolted to the intake manifold behind the fuel rail.
    78's

  7. #7
    Veteran LittleRedSpirit's Avatar
    Join Date
    Dec 2008
    Name
    Matt
    State
    QLD
    Location
    West
    Country
    Australia
    Posts
    1,988

    Default

    As Ive said many times, take it to my mechanic.

    You will waste your life playing with something like this.






  8. #8
    Veteran
    Join Date
    Dec 2008
    Name
    Dave
    State
    QLD
    Location
    Brisbane
    Country
    Australia
    Posts
    2,667

    Default

    haha good luck getting me to take something to a mechanic!! (assuming its mine!!)

    right ive had a bit of a play this arvo

    pulled out the spark plugs and found them to be a tad white on the tips, which from my understanding is a bit lean or possibly a bit of detonation?

    anyway checked the timing again, found it to be a bit too advanced (around 22 before tdc) so i knocked it back to around 15 deg tdc.

    i also found my tps a bit lose which could do annoying things, so i put that back to where it idled the best (could hear the idle switch kicking in) at around 1000rpm constant.

    checked the earths and they are all nice and tight, specially that one you guys are talking about on the intake. all nice and schmick.

    gonna go for test drive in a bit (parked in....) so hopefully ive made some improvements

    quick question, do 4ages have any sort of automatic cut out if it senses something "bad"? like the "boost cut" on turbo cars? i didnt think so since it doesnt have a knock sensor, but you never know.....

    next step is to get my check engine light working and start checking some codes! but its a bit dark for that now...

  9. #9
    Veteran hachi_dk's Avatar
    Join Date
    Mar 2009
    Name
    Filip
    State
    VIC
    Location
    Jozzaville
    Country
    Australia
    Posts
    1,069

    Default

    did u take it round the block

  10. #10
    Veteran Nikkojoe's Avatar
    Join Date
    Dec 2008
    Name
    Tom
    State
    WA
    Location
    Perth
    Country
    Australia
    Posts
    2,260

    Default

    When I meant check earths, I actually meant check if the wiring on them is still good. Best to check all the sensor earths (ie TPS, MAP, etc) which are denoted by a brown wire. These wires run to that earth connection on the inlet manifold (engine ecu/loom earth). Make sure they all earth out to the engine/car body, even when giving the loom wriggle near the earth mounting point.

    Failing every other test (even fault code), unplug the tps and take the car for a drive. If its fixed, you probably have a problem with the tps and/or wiring to the tps.
    1983 AE86 ADM rust spec goodness track car build - end of the road
    1984 AE86 Silver ADM mk2 daily build - SOLD
    1984 AE86 ADM granny car daily now 4AGZE - SOLD
    1983 AE86 ADM Engine Conversion Slut - SOLD
    2002 IS200 6spd - new daily in progress
    1986 AE86 JDM GT-Apex Levin Notchback ready to roll......

Page 1 of 2 1 2 LastLast

Similar Threads

  1. Replies: 20
    Last Post: 3rd August 2009, 04:24 PM
  2. what videogame are you playing currently ??
    By baka_ae86 in forum Offtopic Discussions
    Replies: 119
    Last Post: 3rd October 2007, 05:43 PM
  3. My brakes are playing up ???????
    By MrMatt in forum Technical - Questions
    Replies: 6
    Last Post: 22nd July 2006, 10:27 PM
  4. Price for a Stocko
    By Peripheral in forum General Topics (No Technical Questions)
    Replies: 19
    Last Post: 16th October 2005, 06:42 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •