Got my LH-brain rebuild!!!
08-24-2003, 07:58 AM
#31
Rennlist Member
Hi Normy,
Until you can get the car on a CO meter and adjust the CO pot on the MAF, you won't know definitely that the EPROM swap has worked.
But what you say so far is encouraging !
before, the idle mixture pot had absolutley no effect, so you just need to try now, and see if there's any noticable change of mixture as you tweak the pot.
Did you set the pot to the starting value I recommended ?
Until you can get the car on a CO meter and adjust the CO pot on the MAF, you won't know definitely that the EPROM swap has worked.
But what you say so far is encouraging !
before, the idle mixture pot had absolutley no effect, so you just need to try now, and see if there's any noticable change of mixture as you tweak the pot.
Did you set the pot to the starting value I recommended ?
08-24-2003, 01:34 PM
#32
Three Wheelin'
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John,
If the 2.3LH have only one driver for 8 injectors that explains why the engine will not run when the LH fails. The 944 DME have two injector drivers, one for two injectors
To make the 87and up 2.3 LH reliable someone should make a piggy back 4 injector driver set, 1driver for 2 injectors
If the 2.3LH have only one driver for 8 injectors that explains why the engine will not run when the LH fails. The 944 DME have two injector drivers, one for two injectors
To make the 87and up 2.3 LH reliable someone should make a piggy back 4 injector driver set, 1driver for 2 injectors
08-24-2003, 01:44 PM
#33
Rennlist Member
Hi Steve,
Nice idea, but it's not the injector driver that has failed (usually) when the LH 2.3 will not function. In fact, almost the reverse - the injectors are cycled on and off, as soon as the ignition is on. You hear then clicking away.....
It's other circuits in the ECU that fail, mostly the inputs from the engine sensors.
Nice idea, but it's not the injector driver that has failed (usually) when the LH 2.3 will not function. In fact, almost the reverse - the injectors are cycled on and off, as soon as the ignition is on. You hear then clicking away.....
It's other circuits in the ECU that fail, mostly the inputs from the engine sensors.
08-24-2003, 02:04 PM
#34
Addict
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When my LH ecu failed the symptoms were typical - injectors clicking with ignition on and no fuel pump. By jumping the fuel pump relay I could actually start the engine although it would not idle. By feathering the throttle to keep the engine RPM's synced to the injectors (~2K rpm) I could keep the engine running and was able to limp home. This was tricky with an automatic - I can't imagine trying this with a 5 spd. A fuel pump relay jumper wire is a good thing to keep in the glove box.
Last edited by Steve J.; 08-25-2003 at 12:32 PM.
08-25-2003, 10:55 AM
#35
Rennlist Member
Hi Steve,
yes, every shark should have a relay jumper lead !
When the ECU fails in this way, the injectors are switched on for typically 3mSec at a rate that equates to about 1500rpm. So I guess that matches your experience............
yes, every shark should have a relay jumper lead !
When the ECU fails in this way, the injectors are switched on for typically 3mSec at a rate that equates to about 1500rpm. So I guess that matches your experience............
08-25-2003, 02:19 PM
#37
Rennlist Member
Hi Pete,
yes, certainly for your car. 30-87. The picture on the side of the relay can will cinfirm the sockets to bridge on the relay/fuse panel.
I beleive that 30-87 applies to most MY, but I haven't checked.
yes, certainly for your car. 30-87. The picture on the side of the relay can will cinfirm the sockets to bridge on the relay/fuse panel.
I beleive that 30-87 applies to most MY, but I haven't checked.
08-26-2003, 11:43 PM
#38
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Loren,
We are waiting with baited breathes for your answer.
Why do I get the feeling that you will just pop up with another "helpful" suggestion in another place at another time?
We are waiting with baited breathes for your answer.
Why do I get the feeling that you will just pop up with another "helpful" suggestion in another place at another time?
08-03-2004, 12:14 PM
#39
Burning Brakes
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Originally Posted by Sab
I just got my brain back from the UK from John Speake the owner of jdsporsche.com. It was a very pleasant expirience and I wanted to share it with everyone (I am not affiliated with him), just a very happy customer.
After having quite a rough time with some other "shady" rebuilder (I had a long post a while ago), I finally shipped my LH-brain to John and he took care of the problem the same day he got my unit.
He was very patient explaining me every step of the process, explained what the other rebuilder did wrong or did not do and send me the unit back.
I plugged it in, connected the battery and turned on the ignition. Finally no more clicking injectors with the ignition on. I cranked it up and.... BBBWWWWWWAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.
The whole rebuild with John cost me $550.00
Thanks John, great work.
regards,
Sab.
After having quite a rough time with some other "shady" rebuilder (I had a long post a while ago), I finally shipped my LH-brain to John and he took care of the problem the same day he got my unit.
He was very patient explaining me every step of the process, explained what the other rebuilder did wrong or did not do and send me the unit back.
I plugged it in, connected the battery and turned on the ignition. Finally no more clicking injectors with the ignition on. I cranked it up and.... BBBWWWWWWAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.
The whole rebuild with John cost me $550.00
Thanks John, great work.
regards,
Sab.
08-03-2004, 12:34 PM
#40
Three Wheelin'
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Songzz-
I do, but do not want to release without his permission. He was having some email problems last month but he is definitely still there & active. He has been very responsive in my experience and I will send a message to him.
I do, but do not want to release without his permission. He was having some email problems last month but he is definitely still there & active. He has been very responsive in my experience and I will send a message to him.
Last edited by Donald; 08-03-2004 at 01:03 PM.
08-03-2004, 12:53 PM
#41
Rennlist Member
Thanks Donald,
I did receive a mail from Songzzz this morning, and have replied. I am waiting for his mail back to me.
Songxx - if you did not get my mail from info@..... please PM me.
regards,
I did receive a mail from Songzzz this morning, and have replied. I am waiting for his mail back to me.
Songxx - if you did not get my mail from info@..... please PM me.
regards,
08-03-2004, 01:17 PM
#42
Hey John
Having been to two previous 'specialist' workshops my 89GT is now at the local Porsche dealer where they are trying unsuccessfully to fix a fault in the instrument panel and/or trip computer circuit boards. After 3 weeks I think they've run out of ideas. Anyway as a last resort they're proposing to replace the entire instrument cluster at enormous expense. Could you fix a fault on one of these? There might be a bit of a market here. I believe failed instrument CBs are quite common.
Pretty please.
Colin
Having been to two previous 'specialist' workshops my 89GT is now at the local Porsche dealer where they are trying unsuccessfully to fix a fault in the instrument panel and/or trip computer circuit boards. After 3 weeks I think they've run out of ideas. Anyway as a last resort they're proposing to replace the entire instrument cluster at enormous expense. Could you fix a fault on one of these? There might be a bit of a market here. I believe failed instrument CBs are quite common.
Pretty please.
Colin
08-03-2004, 02:50 PM
#44
Burning Brakes
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Why would anyone worry at all about the availability of L/LH in the future?
If you want to keep it 'factory' John (or somebody with an o-scope and some skill) can fix it for you. It's a big box filled with primitive (easy to work on) electronics. Not for amatuers, but hardy debugging an MP3 player.
You can already swap out 'L/LH' with a half dozen different fully programmable replacement ECUs. They all have the same, or better capabilites as L/LH. Some cost more than a NEW (not reman) ECU, some cost less (way less).
The cars will always be able to run. ECUs are just a more complicated tire - they may not make your exact factory model anymore, but we can get one that's at least as good to work.
Greg
If you want to keep it 'factory' John (or somebody with an o-scope and some skill) can fix it for you. It's a big box filled with primitive (easy to work on) electronics. Not for amatuers, but hardy debugging an MP3 player.
You can already swap out 'L/LH' with a half dozen different fully programmable replacement ECUs. They all have the same, or better capabilites as L/LH. Some cost more than a NEW (not reman) ECU, some cost less (way less).
The cars will always be able to run. ECUs are just a more complicated tire - they may not make your exact factory model anymore, but we can get one that's at least as good to work.
Greg
