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Location:
Victoria, Melbourne
Registered:
August 2003
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4age problem....wheres all the power??
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Fri, 07 May 2004 03:09
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Hi everyone,
just finished putting a 4age into my ae86, and im finding it very very non responsive. The car is drivable..(just) but im finding that there is no power at all in the lower rev range.
It makes the old 4ac look like a rocket!
I have found that it gets all its responsive power when the tvis opens at about 5k.....but it takes about 20sec to get that high in the rev range!!
Does anyone know what could be causing this?
The engine has semi-adjustable cams gears on it, could it be that all the power is set to high up in the rev range??
its really starting to bug me..
any help is much appreciated
cheers ryan
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Location:
NSW, East Coast
Registered:
July 2003
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Location:
Posts: 992738234
Registered:
February 2004
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Re: 4age problem....wheres all the power??
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Sat, 08 May 2004 03:20
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Reminds me of a inital D episode when takumi first gets behind the wheel of the "atlantic 4age", mabey you should rev to 11k??? 
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Location:
Brisbane
Registered:
September 2003
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Re: 4age problem....wheres all the power??
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Sat, 08 May 2004 07:05
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check your timing
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Location:
Victoria, Melbourne
Registered:
August 2003
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Re: 4age problem....wheres all the power??
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Sat, 08 May 2004 07:34
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yeah did the timing yesterday, everything is spot on...
i dunno about the tps but, is there anyway to reset it??
dosent seem to have any leaks in the intake.
im stumped for ideas! 
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Location:
Sydney
Registered:
May 2002
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Re: 4age problem....wheres all the power??
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Sat, 08 May 2004 13:09
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just had another thought ryan while reading another thread,
not sure but the distributers may be different on the FWD and RWD motors, someone may be able to confirm this, because if your running a FWD computer you may need to find a FWD distributer to try ????
just a passing thought.
Ben.
AE86 Trueno 4AGE.
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Location:
Melbourne
Registered:
November 2003
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Re: 4age problem....wheres all the power??
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Sat, 08 May 2004 17:28
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Naw, he doesn't need any of that. Just rev it to 11,000. You'll be right. 
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Location:
melbourne
Registered:
September 2003
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Re: 4age problem....wheres all the power??
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Sun, 09 May 2004 00:44
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below 5000rpm, it isn't any faster than a 4ac.
did you change your exhaust? i had the same problem when i installed mine.. had to get a smaller tip to restrict the flow.
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Location:
Victoria
Registered:
January 2004
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Re: 4age problem....wheres all the power??
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Sun, 09 May 2004 08:02
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had a very similar problem on my twinky cause one of the little vacuum hoses on the tvis was not conected  after i "fixed":roll: the head gasket. When it's idleling disconect the tps and see if it does anything diffent, if not you found something. .........chris
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I supported Toymods
Location:
sydney.au
Registered:
August 2002
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Re: 4age problem....wheres all the power??
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Sun, 09 May 2004 08:29
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| ke70_3SGTE wrote on Sat, 08 May 2004 13:20 |
Reminds me of a inital D episode when takumi first gets behind the wheel of the "atlantic 4age", mabey you should rev to 11k???
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| Shraka wrote on Sun, 09 May 2004 03:28 |
Naw, he doesn't need any of that. Just rev it to 11,000. You'll be right.
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guys this is tech and conversions, not "im a funny cunt, laugh at me". please refrain from verbal dribbling.  thats what the outhouse is for
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Sun, 09 May 2004 11:43
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thank you, agreed. Keep the funny BS to the outhouse.
When u did the timing you did earth the timing "diagnostic pin" didnt you? Otherwise you have timed the engine to a bad reference.
I would also inspect cam timing, vacuum leaks, and everything else!!
Sounds crappy dude 
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Location:
NSW, East Coast
Registered:
July 2003
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Re: 4age problem....wheres all the power??
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Sun, 09 May 2004 13:36
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Any progress.
Steve
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 03:37
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Well timings been checked again, and there appears to be no vacuum leaks. The part numbers on the distributors are the same so i doubt its that. Tried changing TPS, map sensor, dizzy, ecu and other shit i cant remember and its still rooted. Anybody got any other ideas?
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Location:
NSW, East Coast
Registered:
July 2003
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 03:47
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| Hirogen wrote on Mon, 10 May 2004 13:37 |
Well timings been checked again, and there appears to be no vacuum leaks. The part numbers on the distributors are the same so i doubt its that. Tried changing TPS, map sensor, dizzy, ecu and other shit i cant remember and its still rooted. Anybody got any other ideas?
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Did you just change/try another dizzy cap or the hole thing, i think there would be a fault code on the computer if its running as bad as you say.
What condition are the spark plugs, thoroughly clean them and see what happens.
You'll find the problem,its just a process of elimination.
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 04:07
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Tried cleaning the plugs a few times, even though they were fine when we pulled them out. And yes we changed the whole dizzy.
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Location:
NSW, East Coast
Registered:
July 2003
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 06:38
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Hey man, anything you can think of just throw it out, were desperate now so any ideas however dumb will be attempted. But yeah that earth seems fine
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Location:
NSW, East Coast
Registered:
July 2003
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 07:08
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| thevelvetgreasemonkey wrote on Sun, 09 May 2004 18:02 |
When it's idleling disconect the tps and see if it does anything diffent, if not you found something. .........chris
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What were the results of this.
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Location:
NSW, East Coast
Registered:
July 2003
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 07:14
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Is there a adjuster on the tvis, perhaps its closed to much restricting airflow too much.
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 07:31
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since then we have a new tps, but i cant test that until the top water outlet comes back from being repaired. As soon as thats done, ill post back here.
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 07:32
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| FKN16V wrote on Mon, 10 May 2004 17:14 |
Is there a adjuster on the tvis, perhaps its closed to much restricting airflow too much.
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I dont beleive there is an adjuster on the Tvis, anyone tell me for sure?
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Location:
Adelaide
Registered:
May 2003
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 08:10
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| FKN16V wrote on Mon, 10 May 2004 16:29 |
Is the earth on the inlet manifold (below/underneath the fuel rail) connected properly.
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I dont think it would be that, cos if you lose that ground you lose your ECU entirely and the car stalls. It was the problem i had in my GZE when i was building her.
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 09:57
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Well I thought Ryan had mentioned this but i cant read anywhere that he did. The problem seems to be only when the engine is under load. When its just sitting there it appears to rev just fine, try to move the car though, and it dies in the arse. Hopefully this new info can lead to an answer.
I did also bridge the two ECU pins when i set the timing, but im told the revs should alter slightly when the pins are bridged, but when I did, it did bugger all. When the wiring was done, alot of stuff was discarded, including the diagnostic connector so im working directly from the ECU here. Can anyone tell me which pins on the AE82 ECU im supposed to bridge? (ie which connector, then which number pin) Thanks heaps.
[Updated on: Mon, 10 May 2004 10:00]
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Location:
Sydney
Registered:
January 2003
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 13:24
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mine was doing a similar thing when i first put the 4ag in my sprinter it turned out to be a wiring problem, the injectors were pumping at twice heir regular duty cycle for some reason,
it might be a similar problem because below about 5000 the injectors pulse once per engine revolution and above 5000 they pulse once every second engine revolution. so possibly it might be getting too much fuel at lower revs and then it gets a bit better air/fuel ratios up in the revs.
other than that i'm not really sure what it could be
have you tested the map/afm
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 10 May 2004 13:58
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| SPRINTAH! wrote on Mon, 10 May 2004 23:24 |
mine was doing a similar thing when i first put the 4ag in my sprinter it turned out to be a wiring problem, the injectors were pumping at twice heir regular duty cycle for some reason,
it might be a similar problem because below about 5000 the injectors pulse once per engine revolution and above 5000 they pulse once every second engine revolution. so possibly it might be getting too much fuel at lower revs and then it gets a bit better air/fuel ratios up in the revs.
other than that i'm not really sure what it could be
have you tested the map/afm
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Interesting idea. Yeah i tried my MAP sensor on his car and it didnt change a thing. How exactly was this problem remedied on your car?
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Location:
Victoria, Melbourne
Registered:
August 2003
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Re: 4age problem....wheres all the power??
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Fri, 14 May 2004 08:19
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well im gonna have to bite the bullet and take it to a place to get the problem sorted...
could anyone recommend a place where i could take it to?? (in melb)
this problem is really starting to give me the shits,  and any help on this would be much appreciated!!
cheers
ryan
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Location:
Adelaide
Registered:
May 2003
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Re: 4age problem....wheres all the power??
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Fri, 14 May 2004 08:40
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Try Racing Project in Mitcham, since we have 3 4A sprinters and my GZE. Or Toyospares.
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Location:
Sydney (Campbelltown...!)
Registered:
December 2003
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Re: 4age problem....wheres all the power??
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Fri, 14 May 2004 08:49
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i had a problem like this at work
plugs were stuffed, black and fauled but it was missing under load
is it missing at all?? if u go up a hill under load does it caught and splutter?
check compression might be low...
check lead resistance
check fuel pressure
check fuel filter might be blocked
check fuel might have water in the tank
could be heaps of things...
wat fuel pump are you running it might not be supplying it with enough fuel pressure
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Location:
Melbourne, Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Fri, 14 May 2004 09:26
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well it seems like the car is improving, I have no idea why but im not about to look a gift horse in the mouth
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Location:
s.a
Registered:
May 2004
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Re: 4age problem....wheres all the power??
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Mon, 07 June 2004 12:14
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try replacing your fuel pressure regulator.
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Location:
s.a
Registered:
May 2004
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Re: 4age problem....wheres all the power??
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Mon, 07 June 2004 12:16
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and check your fpr has a good vacuum signal
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Location:
South Australia
Registered:
July 2002
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Re: 4age problem....wheres all the power??
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Mon, 07 June 2004 12:48
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Maybe check your cam timing again. Check the resistance in your ignition leads as well?
If the car isn't coughing like a bastard, then chances are it isn't getting enough fuel - if it is coughing like a bastard, then it probably isn't getting good ignition.
Just some thoughts.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 4age problem....wheres all the power??
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Tue, 08 June 2004 01:57
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Who knows, maybe one day I'll even have an afternoon free and be silly enough to have a look at the thing 
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