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Forum: maintenance & nonperformance Yesterday, 04:13 PM
Replies: 3
Views: 112
Posted By bobxyz
There are instructions floating around somewhere...

There are instructions floating around somewhere on how to replace the blown injector driver transistor in the LH2.4 ECU. The low-Z injectors wouldn't damage the wiring, just the ECU.

IIRC, for...
Forum: maintenance & nonperformance Yesterday, 04:09 PM
Replies: 10
Views: 160
Posted By bobxyz
If you don't care that it doesn't look original,...

If you don't care that it doesn't look original, wgusler's posts and pictures here are what I used:
http://forums.turbobricks.com/showthread.php?t=324711&page=3

I ended up with 5.25" in front...
Forum: aftermarket engine management 10-16-2020, 07:01 PM
Replies: 11
Views: 351
Posted By bobxyz
A little searching found this:...

A little searching found this: http://forums.turbobricks.com/showpost.php?p=4836402&postcount=72
http://forums.turbobricks.com/attachment.php?attachmentid=12115&stc=1&d=1393218568

And this:...
Forum: aftermarket engine management 10-16-2020, 09:32 AM
Replies: 11
Views: 351
Posted By bobxyz
^^^ if this is still available, it would be a...

^^^ if this is still available, it would be a great solution. The DIY hall sensor is here: link (https://www.diyautotune.com/product/hall-effect-crankshaft-position-sensor/)

Hall sensors are much...
Forum: maintenance & nonperformance 10-16-2020, 09:23 AM
Replies: 6
Views: 279
Posted By bobxyz
What wire did you plug in? That connector is...

What wire did you plug in?

That connector is VSS Vehicle Speed Sensor used originally for late 80s cruise control and shift indicator. For LH2.4, the same signal goes to the ECU through a...
Forum: performance & modifications 10-15-2020, 02:47 PM
Replies: 50
Views: 1,443
Posted By bobxyz
Example of engine stand testing:...

Example of engine stand testing: http://www.revsearch.com/grooves/grooves.html

Brief Somender Singh video: https://www.youtube.com/watch?v=Sdmgydl7fU0
Forum: performance & modifications 10-14-2020, 02:03 PM
Replies: 50
Views: 1,443
Posted By bobxyz
I didn't realize that turbobricks was still one...

I didn't realize that turbobricks was still one of the top web sites for Somender Singh Grooves. There's a really long thread here (and amazingly, some of the pictures are still intact): ...
Forum: maintenance & nonperformance 10-13-2020, 07:17 PM
Replies: 21
Views: 473
Posted By bobxyz
I'd measure, or swap, the plug wires. And try...

I'd measure, or swap, the plug wires. And try the timing light on the coil wire pointing at the cam gear -- I think it should show the timing mark evenly at 12-3-6-9 o'clock positions.
Forum: performance & modifications 10-13-2020, 07:13 PM
Replies: 5
Views: 299
Posted By bobxyz
If it's the same as "TP31058_1 1987 740 760...

If it's the same as "TP31058_1 1987 740 760 Wiring Diagrams" pg80, then:
- white goes through a connector to green/white wire off of the speedometer connector
- blue/red is power (ign sw 15R)
-...
Forum: maintenance & nonperformance 10-13-2020, 12:25 AM
Replies: 2
Views: 261
Posted By bobxyz
Brickboard says:...

Brickboard says: https://brickboard.com/FAQ/700-900/TransmissionAuto.htm#Kickdown_Cable_Adjustment
Forum: maintenance & nonperformance 10-05-2020, 07:03 PM
Replies: 11
Views: 422
Posted By bobxyz
If you hear an initial click, but nothing else,...

If you hear an initial click, but nothing else, it's most likely a speaker wire shorted to the chassis, and the deck is automatically shuting off all the speakers to prevent damage.

With the...
Forum: performance & modifications 10-05-2020, 06:58 PM
Replies: 7
Views: 497
Posted By bobxyz
These might help ...

These might help
http://forums.turbobricks.com/showthread.php?p=2865196
https://people.physics.anu.edu.au/~amh110/Diff_LSD/diff_lsd_volvo_dana.htm - see sections 2&3
Forum: performance & modifications 10-02-2020, 10:19 PM
Replies: 22
Views: 1,687
Posted By bobxyz
Potential engine donor instead of trying to...

Potential engine donor instead of trying to rebuild the B21FT? https://www.facebook.com/marketplace/item/611009006244304
and...
Forum: performance & modifications 09-29-2020, 09:06 PM
Replies: 13
Views: 714
Posted By bobxyz
What's wrong with 240deg? Is the timing not...

What's wrong with 240deg? Is the timing not stable during cranking? I'm not sure if it will help, but is 1st Deriv Prediction turned on?

Can you rotate/flip the toothed wheel? How many teeth? ...
Forum: performance & modifications 09-29-2020, 08:41 AM
Replies: 22
Views: 1,687
Posted By bobxyz
Oh, the block is already stripped down in the...

Oh, the block is already stripped down in the car, that changes things.

First off, you want something over the top of the block to protect it from dropped tools. I'd use the head gasket to cut...
Forum: performance & modifications 09-28-2020, 12:08 AM
Replies: 22
Views: 1,687
Posted By bobxyz
There should be lifting brackets on the back of...

There should be lifting brackets on the back of the intake manifold and on the front thermostat housing. There's also one on the exhaust side around #3.
...
Forum: performance & modifications 09-26-2020, 12:19 PM
Replies: 22
Views: 1,687
Posted By bobxyz
I'd be surprised if any reputable machine shop...

I'd be surprised if any reputable machine shop would start work without having all the key parts in hand. Initially, they should be able to look at and measure the block to make sure that the...
Forum: maintenance & nonperformance 09-26-2020, 01:02 AM
Replies: 9
Views: 873
Posted By bobxyz
In electronics for wires that flex a lot, you...

In electronics for wires that flex a lot, you usually use "test lead wire", named for test meter probes that are always getting tossed around. Test lead wire is composed of 50, or 100, maybe 200,...
Forum: maintenance & nonperformance 09-25-2020, 07:35 PM
Replies: 10
Views: 902
Posted By bobxyz
That's a common problem. IPD sells a short...

That's a common problem. IPD sells a short length of the special grade submersible hose just for this - link...
Forum: maintenance & nonperformance 09-25-2020, 07:12 PM
Replies: 9
Views: 728
Posted By bobxyz
This may help:...

This may help: http://forums.turbobricks.com/showpost.php?p=5255661&postcount=19
I just re-hosted the picture earlier this week.

I found another picture for you, from ~5 years ago, 23mm and 21mm...
Forum: aftermarket engine management 09-25-2020, 02:50 PM
Replies: 6
Views: 535
Posted By bobxyz
I think the FTDI DB9-USB-RS232-F would be a...

I think the FTDI DB9-USB-RS232-F would be a direct replacement for the current female DB-9 connector on the MS PCB. With this, you wouldn't need to change any other wiring (no need to wire around the...
Forum: aftermarket engine management 09-25-2020, 01:03 PM
Replies: 6
Views: 535
Posted By bobxyz
The original DB-9 serial connector on the MS is...

The original DB-9 serial connector on the MS is pretty robust. I'd just get another DB-9 to USB adapter cable in the desired length, and with Windows10 drivers.

If you really want to convert to...
Forum: performance & modifications 09-25-2020, 09:38 AM
Replies: 22
Views: 1,687
Posted By bobxyz
There's a bit of info on the custom pistons here:...

There's a bit of info on the custom pistons here: http://forums.turbobricks.com/showthread.php?t=322850

The factory M rods weight a couple tons apiece - the M is for Massive chunk of iron, and...
Forum: maintenance & nonperformance 09-24-2020, 01:00 PM
Replies: 32
Views: 1,664
Posted By bobxyz
^^^ that's an interesting failure scenario,...

^^^ that's an interesting failure scenario, thanks!

If one circuit of the dual circuit master fails, shouldn't it turn on the dashboard light? Does the sensor in the Volvo junction block commonly...
Forum: performance & modifications 09-24-2020, 12:54 PM
Replies: 4
Views: 533
Posted By bobxyz
Do you have a MS3 (the more expensive one) or...

Do you have a MS3 (the more expensive one) or MS2v3 (the original one with a v3 circuit board)?

If you're running a MS3, there's already an AFR Safety System (under Fuel Settings). No idea how...
Forum: maintenance & nonperformance 09-23-2020, 12:02 AM
Replies: 32
Views: 1,664
Posted By bobxyz
If you don't have a copy already, I highly...

If you don't have a copy already, I highly recommend the Bentley Volvo 240 Service Manual -- even if you don't do all the work yourself, it will certainly help you narrow down and understand the...
Forum: performance & modifications 09-22-2020, 11:53 PM
Replies: 22
Views: 1,687
Posted By bobxyz
I rebuilt my B21FT ~4 years ago. It was a...

I rebuilt my B21FT ~4 years ago. It was a quality rebuild - new pistons, oil pump, hoses, valve job, squirters, etc. OE Volvo, Mahle, Melling, Elring, BMW parts. I've never added up all the costs...
Forum: maintenance & nonperformance 09-22-2020, 03:05 PM
Replies: 32
Views: 1,664
Posted By bobxyz
It's probably a bad master cylinder, unless it's...

It's probably a bad master cylinder, unless it's spraying out brake fluid at the wheels or under the car.

The master cylinder has two separate pistons/circuits, usually plumbed in a diagonal to...
Forum: maintenance & nonperformance 09-21-2020, 11:31 PM
Replies: 32
Views: 1,664
Posted By bobxyz
What happens when you have no brakes? 1) pedal...

What happens when you have no brakes?
1) pedal goes to the floor?
2) pedal is firm and maybe stops a bit early with normal effort?
3) pedal is firm and car won't stop with herculean effort?
4)...
Forum: maintenance & nonperformance 09-21-2020, 03:37 PM
Replies: 10
Views: 902
Posted By bobxyz
87 and 87b are 2 contacts (poles) on the relay...

87 and 87b are 2 contacts (poles) on the relay flapper. Both should make contact at the same time when the relay coil is energized. The coil is energized when the circuit in the relay detects tach...
Forum: maintenance & nonperformance 09-20-2020, 06:24 PM
Replies: 10
Views: 902
Posted By bobxyz
Find a copy of...

Find a copy of TP12045-1_wiring_diagrams_1977_1978.pdf (try https://ozvolvo.org/archive/). Unlike some later cars, jumpering fuses 5 and 7 won't turn on either pump -- it's the same as turning on...
Forum: projects & restorations 09-18-2020, 05:27 PM
Replies: 144
Views: 50,966
Posted By bobxyz
Congratulations! What a great Willys build. ...

Congratulations! What a great Willys build. That metallic blue paint looks awesome :love:

And I see that you even added the appropriate York AC setup -- does that go to a dash gauge? ...
Forum: maintenance & nonperformance 09-18-2020, 12:51 AM
Replies: 20
Views: 1,128
Posted By bobxyz
I think you can replace the head gasket without...

I think you can replace the head gasket without pulling the engine. If you have the original log exhaust manifold, you may need to unbolt the engine mounts to get enough clearance. Maybe someone...
Forum: performance & modifications 09-17-2020, 04:25 PM
Replies: 7
Views: 816
Posted By bobxyz
The response you got from the ebay seller is...

The response you got from the ebay seller is amazingly good. About the only thing that might be incorrect is that the ebay seller was expecting the 5cyl ECU to put out 5 pulses per engine cycle,...
Forum: maintenance & nonperformance 09-16-2020, 10:01 PM
Replies: 20
Views: 1,128
Posted By bobxyz
Once this pandemic !#@^$& is over, we'll need to...

Once this pandemic !#@^$& is over, we'll need to get together and compare my rebuilt B21FT+LH2.4 AW71 wagon to your B21FT+MS sedan.

For machine shops, western engine supply...
Forum: performance & modifications 09-15-2020, 08:29 PM
Replies: 18
Views: 887
Posted By bobxyz
I don't know, it seems like a +T conversion on a...

I don't know, it seems like a +T conversion on a B21F (9.3 cr) would be pretty similar to a +T on a B230F (9.5, or 9.8?, cr). You'd need to use premium (93 octane around here) and keep the boost...
Forum: maintenance & nonperformance 09-14-2020, 07:42 PM
Replies: 1
Views: 439
Posted By bobxyz
Name that tensioner bracket

The earlier brackets for the small 55Amp alternator don't have an adjuster (#3). From underneath, I just wedge a big screwdriver, or tire iron, between the alt and the block bracket, and wedge it...
Forum: aftermarket engine management 09-13-2020, 09:49 PM
Replies: 34
Views: 1,895
Posted By bobxyz
Glad you figured it out! :) I was certainly...

Glad you figured it out! :) I was certainly perplexed....

I think that connecting both JS10 and D14 to the ignition module resulted in a very low coil charging current, and that the only way to...
Forum: aftermarket engine management 09-12-2020, 06:18 PM
Replies: 34
Views: 1,895
Posted By bobxyz
I'm still stumped. Something certainly isn't...

I'm still stumped. Something certainly isn't right.

^^^ this link confirms that it should be GoingLow. Check your SparkA circuit -- make sure it's connected to D14 (R26 is used for a different...
Forum: aftermarket engine management 09-12-2020, 10:34 AM
Replies: 34
Views: 1,895
Posted By bobxyz
GoingLow should generate a spark, but the rotor...

GoingLow should generate a spark, but the rotor may not be in the correct position to steer it to a plug tower. Try cranking (injectors unplugged) and see if you're getting a spark off the unplugged...
Forum: aftermarket engine management 09-11-2020, 08:45 PM
Replies: 34
Views: 1,895
Posted By bobxyz
I have one other idea - you may have both a...

I have one other idea - you may have both a misaligned distributor and an incorrect Spark Output setting, resulting in your coil charging on the wrong half of the cycle, but the spark firing at about...
Forum: aftermarket engine management 09-11-2020, 10:41 AM
Replies: 34
Views: 1,895
Posted By bobxyz
Hi Kenny, the OP has posted multiple logs and the...

Hi Kenny, the OP has posted multiple logs and the .msq, but the links don't pop out clearly amidst my ramblings. I'd love to know if you see anything wrong in the setup or logs.
Forum: aftermarket engine management 09-11-2020, 09:02 AM
Replies: 34
Views: 1,895
Posted By bobxyz
Don't go and buy another timing light for this --...

Don't go and buy another timing light for this -- it's a long shot. On yours, check that it's set for 4-cycle (or 4-stroke) and 0deg advance. If it's setup for a 2-stroke, with non-zero advance, it...
Forum: aftermarket engine management 09-11-2020, 12:08 AM
Replies: 34
Views: 1,895
Posted By bobxyz
Well, I'm stumped. The standard log shows 0deg...

Well, I'm stumped. The standard log shows 0deg spark timing from all the contributors for the whole log. Sure looks like MS timing is completely fixed.

Do you have access to a different timing...
Forum: aftermarket engine management 09-10-2020, 08:59 PM
Replies: 34
Views: 1,895
Posted By bobxyz
Mighty strange.... I looked at your .msq and...

Mighty strange....

I looked at your .msq and tooth logs, but nothing seemed bad. :???:

For some reason, my copy of megalogviewer didn't like your composite tooth log, but I was able to view...
Forum: aftermarket engine management 09-10-2020, 05:17 PM
Replies: 34
Views: 1,895
Posted By bobxyz
You sure you have a LH2.2 distributor with fixed...

You sure you have a LH2.2 distributor with fixed advance??? I think Europe may have had some Volvo 240 distributors with 3 wires and centrifugal/vacuum advance. If it's not the electronics, and not...
Forum: aftermarket engine management 09-10-2020, 12:59 PM
Replies: 34
Views: 1,895
Posted By bobxyz
Wow, that's a big shift (10deg to 20+deg from...

Wow, that's a big shift (10deg to 20+deg from idle to 2500rpm). I forget if you need to do a power-cycle after setting MS to Fixed timing mode. Maybe post your .msq, or a screenshot of the fixed...
Forum: aftermarket engine management 09-10-2020, 12:24 AM
Replies: 34
Views: 1,895
Posted By bobxyz
On the PCB, there are opto-isolator circuits and...

On the PCB, there are opto-isolator circuits and VR circuits available to condition the tach pulse. The opto circuits can be used with a direct coil connection (for a fuel-only MS setup), or with a...
Forum: aftermarket engine management 09-09-2020, 08:39 PM
Replies: 34
Views: 1,895
Posted By bobxyz
Is it a relatively new MS2 V3.0 build? IIRC,...

Is it a relatively new MS2 V3.0 build? IIRC, some of the really old ones used some filter caps that were way too big. Are you using the adjustable VR circuits or the opto-isolator circuits for...
Forum: aftermarket engine management 09-09-2020, 08:23 PM
Replies: 14
Views: 1,133
Posted By bobxyz
I'd guess that you have a loose connection...

I'd guess that you have a loose connection between the MS and the disti that's picking up noise. Try tugging/wiggling the wires and see if it gets better/worse. There might also be a bad ground...
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