| Author |
Message |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5393
Reg: 11-2005
|
Mmm okay, so I have recently put a 1UZFE + A431E into my BMW E36 Coupe.
It runs fantastically, however if I am going 0-45km/h and put it in Drive gear, and floor it to full throttle it sort of misses and hunts, repeats until it goes over 50km/h before powering ahead normally to the redline.
If I floor it when I'm doing 50km/h+ it kicks down a couple of gars and does what it should normally but below that speed.
Any ideas what the low speed full throttle miss could be?
I thought it could be one of the O2 sensors or AFM not reading right? Back when the I had the motor in the LS400 body the only error I got from a diagnostics test was one bad O2.. |
Dan McColl
Goo Roo
Victoria (The Nazi State)
Pretty Red Thing and The Black Beast
Posts: 3059
Reg: 07-2005
|
Most likely damaged a wire during the transplant. Check cam and crank angle sensors first.
Could be a failing coil. |
Joshua Baldwin
Goo Roo
victoria
1990 ucf11 c+f celsior. 1991 uzz31 toyota soarer 2003 vy sv8 ute
Posts: 1477
Reg: 10-2009
|
sounds like a sensor is not giving a correct signal/pulse at a higher voltage causing confusion at the ecu end? |
Jamie Richards
TryHard
St.john's
v8
Posts: 173
Reg: 06-2009
|
sound like AFM unplug & try running car see what happens |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5394
Reg: 11-2005
|
I've tried that, still does it, and runs a bit rough without the AFM.
Interestingly it revs fine at WOT in neutral but doesn't like it in drive...
Maybe I will start with replacing the o2 sensors, they are probably a bit knackered |
Brett Harrison
DieHard
QLD
JZZ30
Posts: 773
Reg: 09-2005
|
I doubt it is O2 sensors, the 1U will run fine without them, but then again you never know.
I would be looking at TPS, make sure that is set to factory specs. Often if the car runs like crap without AFM, suggests faulty or mis aligned TPS.
If you have access to a scan tool, you can plug straight into diagnostics port in engine, then read fault codes. |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5396
Reg: 11-2005
|
Ahhh Brett, you might be onto something here.
Pretty sure about 1 year ago, i took the tps off for some reason so it is probably out of alignment. I will test it as per the LS400 1UZFE manual.
Report back soon! |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5397
Reg: 11-2005
|
So I adjusted as best I could, at 1130pm so I wasn't not in the best shape.
Upon testing it seems the TPS is the culprit, now powers ahead under 45km/h where it didn't before
Although I may need to adjust it again as it did the same thing twice when taking off, but then didn't do it the second time?
So perhaps I need to adjust it a little bit more finely...
Report back tomorrow. |
Brett Harrison
DieHard
QLD
JZZ30
Posts: 774
Reg: 09-2005
|
To make it easier, get an old wiring plug, any toyota one. Break the plastic and pull out the wires with their small female spade connectors.
Then plug those into the TPS, then alligator clips to those wires, then to multimeter. Ive found this makes it much easier than trying to hold three things at once. |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5398
Reg: 11-2005
|
Haha that is exactly what I did - I've got the whole LS400 loom from the donor car so it's useful to take parts off
I adjusted it again this morning, all testing correct, and works faultlessly on the road now.
Thank you Brett! |
Peter Williams
TryHard
Victoria
V8
Posts: 127
Reg: 01-2009
|
Mike, any pictures? |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5399
Reg: 11-2005
|
Off to the paint shop next week!
Not the best pictures, but it gives you an idea of what I have been doing. |
Brett Harrison
DieHard
QLD
JZZ30
Posts: 776
Reg: 09-2005
|
Nice work Mike,
I notice your AFM adaptor looks the same as the one I have, from a 7MGTE ?
So how does she sound, and go ? |
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder
Posts: 6490
Reg: 03-2006
|
Nice work Mike , looks factory ;) |
Damian Ware
Goo Roo
Victoria
UZZ32
Posts: 2096
Reg: 10-2005
|
Great work Mike very neat installation. |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5400
Reg: 11-2005
|
Thanks guys  Quite pleased it's finally done for the most part - I did take time but keep in mind I did everything apart from weld the parts.
Brett Harrison wrote on Saturday, October 01, 2011 - 05:47 pm:I notice your AFM adaptor looks the same as the one I have, from a 7MGTE ?
So how does she sound, and go ?
I got it from Ebay, quite useful, eventually I want to run a MAF sensor as the AFM is far to bulky and restrictive.
It goes pretty well, performs no problem
The trouble I anticipated is the A431E gearbox I used (just to save some costs) has much too tall gearing, coupled with my final drive of 3.71... so it dampens acceleration a bit.
So at this stage I will look at changing the final drive ratio to 3.91 or 4.10.
My intention is to install an A650E I am rebuilding with a different valved body, upgraded clutch packs and a stronger torque converter. Might also have to replace the commonly failing solenoids too, I will then run it through a TCM-2000 controller, so I can use it to its best potential (torque converter lock up etc..)
I suppose I could go to a manual, but I feel I prefer the automatics at this stage and the A650E has really great ratios (No one wants them so the market is swamped with cheap gearboxes)
With a 3.91 diff it would run to a max speed in each gear of:
1st - 56 km/h
2nd - 85 km/h
3rd - 132 km/h
4th - 186 km/h
5th - 250 km/h
The 3UZFE headers I used were a temporary fix, I mean they are loosing me a good 15-20hp, but at least they are something I can upgrade next year once I find the right person to build me some. The rest of the exhaust is from a 328i so 1.8-2" tube is less than ideal.
At present it's pulling 0-62mph in just over 6 seconds flat, so not too shabby for a stock 1uz with a stock auto, it would only be putting out 250hp at best. |
Don Bagnall
Moderator
New Zealand
2002 Ford Fairmont AUII 6 cyl.
Posts: 7676
Reg: 05-2005
|
Very nice Mr.Beck  |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5401
Reg: 11-2005
|
Thanks Don. |
Brett Harrison
DieHard
QLD
JZZ30
Posts: 777
Reg: 09-2005
|
Sounds good mike,
You can simply run it with TPS vs RPM, as so don't need a MAP sensor, the base maps in the ecu are TPS based, when running mafless.
I know the LS400 ran 3.7 diff, and a 2.5 first gear, good for fuel economy, but did kill the off line performance somewhat.
V8 soarer ran a 2.8 first and a 3.92 diff, |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5402
Reg: 11-2005
|
Yeah currently this has a 3.71 diff so basically the same gearing as the LS400 had.
Not ideal! But I was aware.
I have a 3.91 in the cupboard so when I get my hands on a LSD center I will retro fit that lot. |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5403
Reg: 11-2005
|
Ahhh haa!
So I found the problem.
Turns out it wasn't the the AFM or TPS like I thought.
It's the ECU, some of the caps have leaked fluid out, so I will replace those and report back tomorrow! |
Brett Harrison
DieHard
QLD
JZZ30
Posts: 779
Reg: 09-2005
|
Lets hope that is the culprit, their always a little bit finicky to get just right, but once you do it's well worth it. |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5404
Reg: 11-2005
|
Yeah, well it makes sense some of them are visibly stuffed.
I inspected the ECU 6 months ago and it was ok looking.
But now after using the car for a couple of weeks the age of them and the sudden use has lead to their failure.
Probably explains why the failure has been intermittent and gradually got worse.... I've tested all the leads and they are within resistance, the coil packs and ignitors are both working and testing ok.
The rotors and distributor caps are probably not helping, as they look a bit tired so Ill need to replace those too. |
Brett Harrison
DieHard
QLD
JZZ30
Posts: 780
Reg: 09-2005
|
Yeah if the ecu doesn't correct it you can start crawling around all the ignition parts, as you probably know, left hand coil is often a failure point. While your at it change the coolant temp sender, green top one. This can make significant difference to performance/economy. |
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i
Posts: 5405
Reg: 11-2005
|
I just hope the electrolyte that leaked from one capacitor the bigger 220uf component didn't damage the board circuit, it looks ok but we shall see.... |
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