4age loses power at 3500rpms

Tman312
Posts: 9
Joined: Fri Aug 30, 2013 10:58 pm

4age loses power at 3500rpms

Postby Tman312 » Tue Mar 11, 2014 8:28 pm

Okay, well here's a new problem. .

My car will lose significant power in the higher rpms, like it's falling on its face. It usually happens between 4k rpms and up. Ive thought about it being T-vis? Ive replaced fuel filter and checked plugs/gap/wires/dizzy/rotor/cap. There is no check engine light on, but when I scan codes I get 6, 7, and 8. http://www.troublecodes.net/toyota/

I swapped the dizzy to another known good working one and set the timing to spec but no change.

Please help, thank you.
1986 Toyota Corolla GTS
Troy
Video
https://www.facebook.com/photo.php?v=10 ... 6594696&ty pe=2&theater

User avatar
jondee86
Moderator
Posts: 2939
Joined: Fri Jan 11, 2013 10:21 pm
Location: Wellington, New Zealand

Re: 4age loses power at 3500rpms

Postby jondee86 » Tue Mar 11, 2014 10:25 pm

Image

I'd guess that you have a ground problem... possibly one of the ECU
grounds. So double check you don't have a loose ground connection or
a broken wire on that single bronze ring connector bolted down at the
back of the head, just above the intake manifold.

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

Tman312
Posts: 9
Joined: Fri Aug 30, 2013 10:58 pm

Re: 4age loses power at 3500rpms

Postby Tman312 » Wed Mar 12, 2014 8:46 pm

Thanks, I will look.

But here's another video...kind of changes sound at 4k I think or maybe it just that it's nice out and i have the windows down...
http://www.youtube.com/watch?v=G9XStdxV ... e=youtu.be

Tman312
Posts: 9
Joined: Fri Aug 30, 2013 10:58 pm

Re: 4age loses power at 3500rpms

Postby Tman312 » Thu Mar 13, 2014 8:45 pm

TVIS is not working, always open.

Swapping out with a spare soon.

Tman312
Posts: 9
Joined: Fri Aug 30, 2013 10:58 pm

Re: 4age loses power at 3500rpms

Postby Tman312 » Sun Mar 16, 2014 5:33 pm

Swapped out coils cause the current one was out of the resistance specs but no change really still slow.

How do you test the IGNITOR? (With a multimeter)

User avatar
jondee86
Moderator
Posts: 2939
Joined: Fri Jan 11, 2013 10:21 pm
Location: Wellington, New Zealand

Re: 4age loses power at 3500rpms

Postby jondee86 » Mon Mar 17, 2014 10:45 pm

If the engine runs fine except for a loss of power in the top end, then
it is unlikely to be an electrical issue. Electrical faults typically give rise
to missing, backfiring, sudden loss of ignition, no start when hot, smoke
and ocasionally flames :o

Loss of power without any other problem will usually be due to a shortage
of air (blocked filter) or timing being out (ignition or cams). Black tailpipe
and plugs indicates rich mixture, and white or very light tan tailpipe
indicates lean mixture, both of which can affect power if extreme. TVIS
stuck open has no effect on top end power, but if the TVIS stays closed it
will hurt your top end.

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

dabes
Club4AG Regular
Posts: 22
Joined: Wed Aug 07, 2013 11:06 am

Re: 4age loses power at 3500rpms

Postby dabes » Mon Jun 20, 2016 1:18 pm

was this issue ever fixed? Im having the same issue.

dabes
Club4AG Regular
Posts: 22
Joined: Wed Aug 07, 2013 11:06 am

Re: 4age loses power at 3500rpms

Postby dabes » Mon Jun 20, 2016 2:27 pm

OK just kidding, didnt realize that this was on a 16v. I have the exact same issues with a 20V.