Got my LH-brain rebuild!!!
08-21-2003, 08:28 PM
#16
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lorenfb,
We have a perfectly reliable source for LH rebuilds who offers seven day door to door service.
What's your problem?
John could probably offer two day service if someone wanted to pay a core charge and the shipping.
We have a perfectly reliable source for LH rebuilds who offers seven day door to door service.
What's your problem?
John could probably offer two day service if someone wanted to pay a core charge and the shipping.
08-22-2003, 02:37 AM
#18
Burning Brakes
Originally posted by ErnestSw
John could probably offer two day service if someone wanted to pay a core charge and the shipping.
John could probably offer two day service if someone wanted to pay a core charge and the shipping.
08-22-2003, 03:54 AM
#19
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What John Speake mentioned is quite correct; I had to replace my LH Steuergerät last year and was told it was the last one in stock in Stuttgart. (This was before John offered his rebuild service) Then just afterwards a couple of guys had to wait for some 'new' ones to be made available by Bosch.
This and the MAF were problematic for us 87/88 owners. Credit to John for providing good value and good quality LH brain and MAF solutions. Who cares where he resides. I'm in Europe and the MAF exchange was done by post - absolutely no problems with any part of the transaction. Rennlist proves that geographical location is no longer relevant.
And the best thing? My shark is running better than ever with the replacement parts!
This and the MAF were problematic for us 87/88 owners. Credit to John for providing good value and good quality LH brain and MAF solutions. Who cares where he resides. I'm in Europe and the MAF exchange was done by post - absolutely no problems with any part of the transaction. Rennlist proves that geographical location is no longer relevant.
And the best thing? My shark is running better than ever with the replacement parts!
08-22-2003, 06:34 AM
#20
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Barry said:
You mean, pay a core charge, have a rebuilt unit sent out, and then upon receiving the customer's faulty brain, refund the core? If I'm understanding you right, I'd be writing a check right now if he'd do it. John? (end quote)
Barry: et al.
Because there are at least 8 versions of the LH ECU fitted to S4 onwards, it's difficult to keep "stock"units .................also the quality of the customer's unit has to be checked out first, to confirm it is suitable for exchange.
But I do have a plan that would mean that when the US agent receives the customer's unit, it can be turned around within an hour.
It's then up to the customer how much he want to pay for return carriage to get it quickly. But it would be internal US postage/carriage cost. My quoted price includes standard UPS carriage costs.
Thanks eveyone for your suportive comments !
You mean, pay a core charge, have a rebuilt unit sent out, and then upon receiving the customer's faulty brain, refund the core? If I'm understanding you right, I'd be writing a check right now if he'd do it. John? (end quote)
Barry: et al.
Because there are at least 8 versions of the LH ECU fitted to S4 onwards, it's difficult to keep "stock"units .................also the quality of the customer's unit has to be checked out first, to confirm it is suitable for exchange.
But I do have a plan that would mean that when the US agent receives the customer's unit, it can be turned around within an hour.
It's then up to the customer how much he want to pay for return carriage to get it quickly. But it would be internal US postage/carriage cost. My quoted price includes standard UPS carriage costs.
Thanks eveyone for your suportive comments !
08-22-2003, 08:15 AM
#21
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-For what its worth to y'all, I got a wild hair up my bum last night and installed the EPROM chip that John Speake cloned for me.
This is the EPROM chip for an '85 ROW or S2 car. My engine had been running with the LH Jetronic unit from an '85 US model....
Speake effectively has the ability to copy chips. My engine started and ran fine last night with his chip-
Normy!
'85 S2 5 Speed
This is the EPROM chip for an '85 ROW or S2 car. My engine had been running with the LH Jetronic unit from an '85 US model....
Speake effectively has the ability to copy chips. My engine started and ran fine last night with his chip-
Normy!
'85 S2 5 Speed
08-22-2003, 02:25 PM
#23
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One interesting and positive change I have noticed with my rebuild unit is that now the idle is correct. I had a low idle since a very long time. Actually since a local shop welded something on my car. They then blew my engine, bought me a replacement engine and it had the same low idle (525 RPM). Shortly before the LH-brain failed I had some intermittend high idle.
It now idles at 650 RPM.
cheers,
Sab.
It now idles at 650 RPM.
cheers,
Sab.
08-22-2003, 02:41 PM
#24
The more I hear, the more i think that my 89 was running incorrectly for some time. My LH died in October of 2002, and since then the car has sat, as my plans are to install a DTA. This is comming much much loser now, and I am looking forward to a correctly controlled 928. I plan on buying another 928, probably an auto 91 or GTS, and I will not be performing the computer change, so its gret to know there is someone doing the computers for the stock cars.
08-22-2003, 03:10 PM
#25
Three Wheelin'
Loren I wouldn't worry about it! Even if for whatever reason there were never ever anyone working on rebuilding LH ECU's on this planet! There are plenty of others out there that would work in it's place.
One could even sub in a Motronic unit off one of those air/oil/water cooled flat six units maybe?
Remember the LH is batch injection, it's only knowledge of it being install on a v8 in the programmable memory if i'm not mistaken (John you can correct me if I wrong).
The possibilities are endless and what you would have in the end could be better than the one you had to start with. Humm, maybe even OBD II?
For me, as long as I can get a stock unit rebuilt "even if it need to make "another" trip across the pond (first being from the factory), I will keep it running on the LH unit.
Kudos John!
One could even sub in a Motronic unit off one of those air/oil/water cooled flat six units maybe?
Remember the LH is batch injection, it's only knowledge of it being install on a v8 in the programmable memory if i'm not mistaken (John you can correct me if I wrong).
The possibilities are endless and what you would have in the end could be better than the one you had to start with. Humm, maybe even OBD II?
For me, as long as I can get a stock unit rebuilt "even if it need to make "another" trip across the pond (first being from the factory), I will keep it running on the LH unit.
Kudos John!
08-22-2003, 05:32 PM
#26
Rennlist Member
hi Max,
It's not even that clever, it fires all 8 injectors at the same time, so it doesn't recognise whether it's a V8...............
There is no reason in principle why you can't upgrade to a Motronic system, but doing the remapping of the ECU would be the time consuming part.
Several people are working on finding out exactly how the 928 EPROM code works. Maybe when that is understood, the maps can be used with another ECU type, thus cutting out a lot of hard work !
Oh s..t, and doing me out of a job !
It's not even that clever, it fires all 8 injectors at the same time, so it doesn't recognise whether it's a V8...............
There is no reason in principle why you can't upgrade to a Motronic system, but doing the remapping of the ECU would be the time consuming part.
Several people are working on finding out exactly how the 928 EPROM code works. Maybe when that is understood, the maps can be used with another ECU type, thus cutting out a lot of hard work !
Oh s..t, and doing me out of a job !
08-23-2003, 12:56 AM
#27
Three Wheelin'
John I thought it shot four injectors at a time off of two separate drivers?
Anyway, thats a long way down the road, John. Even if it was ready in a year or two, there would be some that would stick with the stock LH unit until the very end. By then you will be on your way to selling those easy retro kits to convert the 928 LH and EZK to who knows what?
Anyway, thats a long way down the road, John. Even if it was ready in a year or two, there would be some that would stick with the stock LH unit until the very end. By then you will be on your way to selling those easy retro kits to convert the 928 LH and EZK to who knows what?
08-23-2003, 08:49 AM
#28
Rennlist Member
Sab,
The erratic idle problem you mention is also classic LH ECU "on the way out".................
Max:
No, the LH2.3 (S4 onwards) fires all 8 injectors at the same time, off a common driver stage.
Even the old LH2.2 (Euro S2, and early 32v) did the same. I think some of the early L-jet controllers did 2x4 injector firing. Even then I think they were all fired at the same time.
Then Bosch got clever, and shaped the pulse so that the initial current is high to open the injectors, and then it is reduced to a holding current.
That way they were able to use a single output driver.
All:
From now on, I will return any LH units sent for repair from North America by 2 day UPS Express, at no additional cost. Then you can track it all the way home !
The erratic idle problem you mention is also classic LH ECU "on the way out".................
Max:
No, the LH2.3 (S4 onwards) fires all 8 injectors at the same time, off a common driver stage.
Even the old LH2.2 (Euro S2, and early 32v) did the same. I think some of the early L-jet controllers did 2x4 injector firing. Even then I think they were all fired at the same time.
Then Bosch got clever, and shaped the pulse so that the initial current is high to open the injectors, and then it is reduced to a holding current.
That way they were able to use a single output driver.
All:
From now on, I will return any LH units sent for repair from North America by 2 day UPS Express, at no additional cost. Then you can track it all the way home !
08-23-2003, 01:18 PM
#29
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Originally posted by Lorenfb
I really hate to buy a 928 and have to worry about such a problematic key part and not having multiple reliable sources. I've seen a lot of posts about this problem. Many Porsche shops tell me that once this unit fails, the car is "dead in the water".
I really hate to buy a 928 and have to worry about such a problematic key part and not having multiple reliable sources. I've seen a lot of posts about this problem. Many Porsche shops tell me that once this unit fails, the car is "dead in the water".
Loren, please explain the above statement.
In previous posts, you plug your website which claims to have numerous major Porsche vendors as distributors. Your bogus* website claims to handle repairs of all sorts of automotive electronics.
Why do you constantly talk in circles regarding the availability of electronic repairs, and never reply to questions which address your motives?
* I consider any business website as suspect which does not list a physical address, does not come up on a whois search, and contains only a phone number which does not appear in the reverse directory.
08-23-2003, 10:09 PM
#30
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Hey John-
I have not had a chance to mess with the MAF pot yet.
I drove the car 600 miles to North Carolina today, and I can tell you that the car is running somewhat leaner than it did before. My typical speed today was 80-85 mph, with the air conditioner on, and I managed 18.5 miles/gallon. Compare this with 17.5 from my last trip north- without the A/C. I don't know...what do you think? 18.5 mpg at these speeds, with some hard acceleration occasionally....
Yesterday, I had new tires installed, one new rim, and an alignment done at the Porsche dealership in Orlando. While I was there, I mentioned to the tech that the car was running rich, I had tried nearly everything, and that I suspected that the fuel pressure was high. He checked it and it turns out that the pressure is perfect, with almost no drop even after being shut down for 20 minutes.
I don't know what to think. I'm going to Michigan tomorrow, and sometime in the month of September I guess I'll link up with members of the [fairly large] Michigan 928 contingent. I want to get a few of them to "blip" their throttles, because at this point, I don't know if my car is running all that rich. I think a little black smoke like this is normal, but I'd like to see another car or three do it to make sure. The technician at the shop seems to think that I need to investigate whether or not my catalytic converters are plugged up...he also voiced the opinion that I might have a bad wire, though I guess that this last isn't likely, since I put Nology Hot Wires on the car about 2 years ago.
Anyway, the part throttle response has improved- It seems that my hesitation problem takes more throttle to initiate than before, and I have noticed that my idle is now about 750 rpm, where before I had it set for 900 or so.
WELL... I'm slowly unwinding the massive ball of knotted thread that exists under my hood!
Thanx again!
N
I have not had a chance to mess with the MAF pot yet.
I drove the car 600 miles to North Carolina today, and I can tell you that the car is running somewhat leaner than it did before. My typical speed today was 80-85 mph, with the air conditioner on, and I managed 18.5 miles/gallon. Compare this with 17.5 from my last trip north- without the A/C. I don't know...what do you think? 18.5 mpg at these speeds, with some hard acceleration occasionally....
Yesterday, I had new tires installed, one new rim, and an alignment done at the Porsche dealership in Orlando. While I was there, I mentioned to the tech that the car was running rich, I had tried nearly everything, and that I suspected that the fuel pressure was high. He checked it and it turns out that the pressure is perfect, with almost no drop even after being shut down for 20 minutes.
I don't know what to think. I'm going to Michigan tomorrow, and sometime in the month of September I guess I'll link up with members of the [fairly large] Michigan 928 contingent. I want to get a few of them to "blip" their throttles, because at this point, I don't know if my car is running all that rich. I think a little black smoke like this is normal, but I'd like to see another car or three do it to make sure. The technician at the shop seems to think that I need to investigate whether or not my catalytic converters are plugged up...he also voiced the opinion that I might have a bad wire, though I guess that this last isn't likely, since I put Nology Hot Wires on the car about 2 years ago.
Anyway, the part throttle response has improved- It seems that my hesitation problem takes more throttle to initiate than before, and I have noticed that my idle is now about 750 rpm, where before I had it set for 900 or so.
WELL... I'm slowly unwinding the massive ball of knotted thread that exists under my hood!
Thanx again!
N