Hesitation Found: Ecu Crush Mod Really Works - Page 9

NikFu S. · #**121** 05-07-2011, 05:11 PM

Quote:

Originally Posted by teamilluminata

Did I mess something up?

I don't see anything out of the ordinary other than those two trace links appear to be insulated (mine aren't).

Make sure you've still got continuity there, if you do, this is probably not the cause of your problem.

1986nate · #**122** 05-07-2011, 07:59 PM

ECU bead crush was for early 92 SVXi only... You're gonna need a replacement or get a new resister for the one you just crushed.

Stevebsy · #**123** 05-07-2011, 10:48 PM

I have a 93 and crushed the one in my ECU. It is possible he has an older ECU.

The how-to is here:
http://www.subaru-svx.net/forum/showthread.php?t=54133
and
http://www.subaru-svx.net/forum/showthread.php?t=54161

Was the thing you crushed black? I did mine nearly 10 years ago, but recall that the one to crush was black, and you leave the internal wire, just crush the outside.

Some more searching on the subject should find more info.

teamilluminata · #**124** 05-08-2011, 06:30 AM

I did wonder about that but only slightly. I didn't see the black dot next to the part number and to be honest I can't swear that my ECU is the same year as my engine. I got them from the same guy but that doesn't mean they came from the same car.

I believe mine was black. It did seem a little smaller than ones I'd seen on the crush threads.

I think the hesitation was initially improved but that could have been wishful thinking. I noticed it again a few dozen miles later and then a few dozen more it got worse then worse agian, quite quickly. It seems to have moderated now but is worse than the initial hesitation I was trying to cure.

Changed the fuel filter yesterday - no change.

NikFu S. · #**125** 05-08-2011, 01:14 PM

I'm not certain whether doing this mod on 94+ models should have any negative effects. I don't remember this being expressly outlined by anyone.
It's worth investigating.

Anyone with a spare ECU want to give it a shot?

Maybe we can just crack a few open to see if anyone has the same design with the insulated wires and clean-looking resistor.

oab_au · #**126** 05-09-2011, 01:55 AM

Quote:

Originally Posted by NikFu S.

I'm not certain whether doing this mod on 94+ models should have any negative effects. I don't remember this being expressly outlined by anyone.
It's worth investigating.

Anyone with a spare ECU want to give it a shot?

Maybe we can just crack a few open to see if anyone has the same design with the insulated wires and clean-looking resistor.

The black ones are a ferrite tube around the wire. It acts as an inductor that delays a signal.
They didn't want you's blokes, driven too fast.

Harvey.

NikFu S. · #**127** 05-09-2011, 06:44 AM

Quote:

Originally Posted by oab_au

The black ones are a ferrite tube around the wire. It acts as an inductor that delays a signal.
They didn't want you's blokes, driven too fast.

Harvey.

Righty, but this guy is having problems after doing that mod, I think there is no sense in assuming it's the cause of his new problem, however coincidental.

teamilluminata · #**128** 05-09-2011, 06:49 AM

Quote:

Originally Posted by NikFu S.

Righty, but this guy is having problems after doing that mod, I think there is no sense in assuming it's the cause of his new problem, however coincidental.

I feel the same way but wanted to rule out the crush mod as the culprit. I'm fairly sure there was a delay between doing this mod and the current issue but can't be certain.

So what could be causing my current accelleration problems and where is a good forum to pose the question, Technical Q & A?

Tapani · #**129** 07-17-2011, 08:17 AM

What a fantastic difference this little effort made !

After stumbling on this thread I was rather sceptical, but since it is so easy to do I decided to give it a go.

The car transformed totally. Strange things happen. Still in awe.

Tapani

claret turbo 1992

nimrod8560 · #**130** 10-29-2011, 11:26 AM

So just to be clear you crush the ferrite black "bead" and nothing else?

Tapani · #**131** 10-29-2011, 11:35 AM

Yes, that's correct.

Tapani

THE NEW GUY · #**132** 10-29-2011, 11:49 PM

Quote:

Originally Posted by Tapani

What a fantastic difference this little effort made !

After stumbling on this thread I was rather sceptical, but since it is so easy to do I decided to give it a go.

The car transformed totally. Strange things happen. Still in awe.

Tapani

claret turbo 1992

yours have a turbo? what year is your car? It does not make any sense to me to delay a signal using a ferrite bridge on a system like this. What is causing this hesitation exactly: low amount of gasoline injection, leak on the vacuum during this 2-3 secs by the action of any solenoid, firing advance? Is the learning funtion affecting perfonmance wrongly? anybody with knowledge on electronic circuits to explain why did subaru used a ferrite bridge to delay a signal instead of programing it on the chip?
This hesitation just appears on my svx 94 when the ambient temp began to go down... may be this afect the signal from the MAF...