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Search: Posts Made By: bobxyz
Forum: performance & modifications Today, 02:21 PM
Replies: 5
Views: 159
Posted By bobxyz
No, it's a really skinny little pulse (~0.0001...

No, it's a really skinny little pulse (~0.0001 seconds long), so the multimeter will just read 0volts. If you have access to a labscope, it would be interesting to see if it's a) dead, or b) noisy,...
Forum: performance & modifications 06-30-2022, 06:56 PM
Replies: 5
Views: 159
Posted By bobxyz
The Load or Tq signal is a short pulse generated...

The Load or Tq signal is a short pulse generated twice per rev by the ECU. The width of the pulse is roughly proportional to the MAF air flow or to the injector on-time -- the higher the airflow,...
Forum: maintenance & nonperformance 06-29-2022, 07:10 PM
Replies: 7
Views: 216
Posted By bobxyz
Years ago, I got a Bosch 69591 on closeout from...

Years ago, I got a Bosch 69591 on closeout from rockauto. At the time, I remember looking it up and finding that it was a cross to the whatever was the standard Volvo higher-pressure K-Jet pump. I...
Forum: maintenance & nonperformance 06-28-2022, 09:51 PM
Replies: 15
Views: 541
Posted By bobxyz
I don't understand this behavior. Normally, a NA...

I don't understand this behavior. Normally, a NA ECU with Turbo, or other higher flow, injectors would run much richer than a Turbo ECU. The NA ECU is expecting ~20lbs/hr injectors versus the...
Forum: maintenance & nonperformance 06-25-2022, 12:53 AM
Replies: 15
Views: 541
Posted By bobxyz
OK, the white tops are a little bit bigger than...

OK, the white tops are a little bit bigger than original turbo injectors, but no where close to 8.5 AFRs. Something's dumping fuel into the engine off idle to get to the 8.5 AFRs. Air leaks, crud'd...
Forum: maintenance & nonperformance 06-24-2022, 08:48 PM
Replies: 15
Views: 541
Posted By bobxyz
Are you running turbo injectors (and resistor...

Are you running turbo injectors (and resistor pack) with a non-turbo ECU? What are the Bosch part numbers on your injectors, ECU, EZK?

Normal behavior is idle timing of 12deg, and jumping up to...
Forum: maintenance & nonperformance 06-24-2022, 02:27 PM
Replies: 12
Views: 454
Posted By bobxyz
It's not a precision fit part, so you can make...

It's not a precision fit part, so you can make one if you have a hacksaw and a vice. Start with a suitable small metal plate, such as:...
Forum: maintenance & nonperformance 06-23-2022, 01:11 AM
Replies: 10
Views: 575
Posted By bobxyz
The original Volvo/Bosch MAFs are a hot-wire...

The original Volvo/Bosch MAFs are a hot-wire sensor, where there is literally a really thin heated platinum wire in the air stream. If you take the screen off the MAF, you can see the wire strung...
Forum: performance & modifications 06-22-2022, 06:38 PM
Replies: 33
Views: 1,162
Posted By bobxyz
Cool project! May it provide many hours of...

Cool project! May it provide many hours of entertainment and head scratching. :lol:


This is a wicked idea, but you would have to know the exact relationship of air mass to voltage, which I do...
Forum: maintenance & nonperformance 06-17-2022, 09:18 PM
Replies: 6
Views: 428
Posted By bobxyz
Sorry, didn't mean to make it worse. :oops: ...

Sorry, didn't mean to make it worse. :oops:

If you look inside the old MAF, there should be 4 spikes sticking out in roughly a square. Between 3 of the 4 should be a really thin and hard to see...
Forum: maintenance & nonperformance 06-17-2022, 07:57 PM
Replies: 1
Views: 270
Posted By bobxyz
http://forums.turbobricks.com/showpost.php?p=59941...

http://forums.turbobricks.com/showpost.php?p=5994146&postcount=64
Forum: maintenance & nonperformance 06-17-2022, 03:17 PM
Replies: 6
Views: 428
Posted By bobxyz
Check your hoses again - make sure they're all...

Check your hoses again - make sure they're all fully seated (including brake booster, and IAC hoses), and that there aren't any new ruptures/big cracks (squeeze and feel around the backsides where...
Forum: maintenance & nonperformance 06-16-2022, 07:11 PM
Replies: 18
Views: 704
Posted By bobxyz
Bentley chapter 242 is for CIS :lol:. If you go...

Bentley chapter 242 is for CIS :lol:. If you go through the procedure and can't get it low enough, I'd guess an air leak or crud-ed up throttle plate or IAC.

I just went through CO emissions in...
Forum: performance & modifications 06-13-2022, 07:32 PM
Replies: 9
Views: 655
Posted By bobxyz
^^^ Yes. For wasted spark, the wasted one...

^^^ Yes.

For wasted spark, the wasted one should occur at TDC of the exhaust stroke (when nothing's in the cyl). Firing order of 1-3-4-2 means 1-4 and 3-2 are the pairs that are at TDC at the...
Forum: maintenance & nonperformance 06-13-2022, 07:24 PM
Replies: 10
Views: 648
Posted By bobxyz
That's certainly a strange set of behaviors. ...

That's certainly a strange set of behaviors.

I looked at the '93 wiring diagrams (my crossword puzzle for the day), and I think you have a short between the brake light wire and the fog light...
Forum: performance & modifications 06-13-2022, 06:39 PM
Replies: 9
Views: 655
Posted By bobxyz
Let's start with a couple basics: 1) When did...

Let's start with a couple basics:
1) When did the engine last run properly? What have you done since then? Have you remounted the flywheel/flexplate?

2) In MS, if you go to the CANbus/Testmodes...
Forum: maintenance & nonperformance 06-13-2022, 03:25 PM
Replies: 10
Views: 648
Posted By bobxyz
Check the ground wires off of each taillight...

Check the ground wires off of each taillight assembly - there can be strange failures if the grounds aren't good. If you have a helper, or a stick, push down the brake pedal and measure the voltage...
Forum: performance & modifications 06-13-2022, 03:20 PM
Replies: 9
Views: 655
Posted By bobxyz
Since it runs and you're using a "tooth angle one...

Since it runs and you're using a "tooth angle one at 258 degrees", I'd guess that you have non-standard wiring to the COPs. Normally, SparkA/IgnOut1 should fire the spark on cyl #1 (or wasted sparks...
Forum: maintenance & nonperformance 06-12-2022, 08:41 PM
Replies: 2
Views: 386
Posted By bobxyz
Get a 2' piece of rubber/plastic hose, stick one...

Get a 2' piece of rubber/plastic hose, stick one end by your ear, and search around with the other end to help find the source of the noise. Or go big and buy the $4.99 Harbor Freight mechanics'...
Forum: performance & modifications 06-12-2022, 08:36 PM
Replies: 17
Views: 1,117
Posted By bobxyz
You're talking about a pretty big project --...

You're talking about a pretty big project -- custom hardware design, custom PCB, custom display bezel/mounting, embedded firmware, and a custom Apple/Android App, but here's some suggestions to get...
Forum: aftermarket engine management 06-11-2022, 10:38 AM
Replies: 46
Views: 3,130
Posted By bobxyz
:cool: Great to hear that it's finally behaving...

:cool: Great to hear that it's finally behaving right
Forum: maintenance & nonperformance 06-10-2022, 03:37 PM
Replies: 11
Views: 566
Posted By bobxyz
It most likely slipped at the crank gear...

It most likely slipped at the crank gear (smallest of the gears), with cam and aux still being in correct alignment to each other. If you rotated the cam gear to re-align, you need to rotate the aux...
Forum: maintenance & nonperformance 06-10-2022, 03:27 PM
Replies: 11
Views: 566
Posted By bobxyz
Crank it around until the #1 cam lobes are facing...

Crank it around until the #1 cam lobes are facing upwards ("perky"), then use a straw (or chopstick) through #1 sparkplug hole to feel for TDC as you rotate the crank fwd/back, then see if the cam...
Forum: aftermarket engine management 06-10-2022, 08:59 AM
Replies: 46
Views: 3,130
Posted By bobxyz
That sux! Does it at least start _much_ easier...

That sux! Does it at least start _much_ easier than before?

Can you double check that all tach noise filtering is off (Ignition - NoiseFiltering: all boxes off)?

If you haven't done the logs...
Forum: aftermarket engine management 06-08-2022, 11:40 AM
Replies: 46
Views: 3,130
Posted By bobxyz
I don't have my notes/docs here, but you need to...

I don't have my notes/docs here, but you need to add a pullup resistor from the tachout wire on the hall sensor to +5Vref, and you need +12V to the sensor too. I'll check the details tonight if...
Forum: maintenance & nonperformance 06-07-2022, 09:00 AM
Replies: 3
Views: 552
Posted By bobxyz
A VR (variable reluctance) sensor generates...

A VR (variable reluctance) sensor generates electricity from a moving magnetic field. It consists of an iron core, wound with lots of fine wire, and a magnet. When a gear tooth comes close to the...
Forum: aftermarket engine management 06-04-2022, 06:20 PM
Replies: 9
Views: 725
Posted By bobxyz
Here's a rather technical description of how...

Here's a rather technical description of how megasquirt fueling works: http://www.megamanual.com/v22manual/mfuel.htm#equation

Basically, it's trying to figure out how long to pulse the injectors...
Forum: maintenance & nonperformance 06-04-2022, 04:16 PM
Replies: 12
Views: 660
Posted By bobxyz
What are the engine specs, and what ECU/EZK are...

What are the engine specs, and what ECU/EZK are you using? Has it been chipped, or remapped, to add lots of timing just off of idle?
Forum: aftermarket engine management 06-04-2022, 04:13 PM
Replies: 9
Views: 725
Posted By bobxyz
Check what each setup is using for the injector...

Check what each setup is using for the injector "required fuel" pulse width or whatever the other ECUs call it. This gets multiplied by everything else and can be used to shift the VE map up or...
Forum: projects & restorations 05-31-2022, 09:05 PM
Replies: 26
Views: 2,385
Posted By bobxyz
- Is the '84 245 a "California" model (versus the...

- Is the '84 245 a "California" model (versus the other 49 states)? If so, you need a California 740T/940T as the donor.

- I don't think you can do the B23+T since it isn't an original engine...
Forum: aftermarket engine management 05-29-2022, 07:38 PM
Replies: 10
Views: 888
Posted By bobxyz
Here's a link to what I did 5+ years ago (how...

Here's a link to what I did 5+ years ago (how time flies) to setup Closed Loop Idle and Idle Spark Advance with MegaSquirt. Hopefully some of it translates to Link:...
Forum: performance & modifications 05-28-2022, 01:14 PM
Replies: 6
Views: 1,003
Posted By bobxyz
Your reference picture of the 2x2 Bosch coil has...

Your reference picture of the 2x2 Bosch coil has disappeared, but the spark plug wires on it were OK - 1&4 on right side of coil, 2&3 on left side of coil when looking at it from the front of the...
Forum: performance & modifications 05-27-2022, 05:10 PM
Replies: 6
Views: 1,003
Posted By bobxyz
I'm confused - what exactly is your setup? ...

I'm confused - what exactly is your setup? MicroSquirt + Bosch 2x2 Coil + Dual external ignitor? Or are you trying to use MicroSquirt for fuel-only, and keeping the EZ116K, with an add-on wasted...
Forum: aftermarket engine management 05-26-2022, 06:43 PM
Replies: 2
Views: 502
Posted By bobxyz
The chip is not discontinued, or at least...

The chip is not discontinued, or at least digikey.com (USA) and uk.farnell.com (UK) both list it as in stock and not EOL. Technically, the MS3 knock sensor software is "NOTE! This feature is only...
Forum: aftermarket engine management 05-24-2022, 11:38 PM
Replies: 46
Views: 3,130
Posted By bobxyz
I looked at your MicroSquirt Tooth Logger logs...

I looked at your MicroSquirt Tooth Logger logs and think I understand most of what I'm seeing, but I'm still puzzled by your original picture where it was running OK and then lost sync at ~2400rpm.
...
Forum: aftermarket engine management 05-23-2022, 03:32 PM
Replies: 46
Views: 3,130
Posted By bobxyz
Hmm...., it's certainly a strange one. One...

Hmm...., it's certainly a strange one.

One more thought, how's the alternator? Bad diodes in the alternator can cause a lot of extra electrical noise, which might confuse the VR signal/circuit. ...
Forum: aftermarket engine management 05-23-2022, 03:01 PM
Replies: 46
Views: 3,130
Posted By bobxyz
From the Composite Logger graph in your 1st post,...

From the Composite Logger graph in your 1st post, it looks like it skipped a bunch of teeth and lost sync when accelerating from ~2400rpm. This is weird - I'd expect a bunch of lost teeth possibly...
Forum: aftermarket engine management 05-22-2022, 09:31 PM
Replies: 46
Views: 3,130
Posted By bobxyz
You could try wiring direct from the CPS...

You could try wiring direct from the CPS connector to the MicroSquirt using 2-wire shielded cable (link (https://www.diyautotune.com/product/wire-2-core-shielded-22-gauge-10-39/)). Connect the...
Forum: performance & modifications 05-21-2022, 01:04 PM
Replies: 15
Views: 1,415
Posted By bobxyz
The old 55Amp B21 Alternator Bracket goes on the...

The old 55Amp B21 Alternator Bracket goes on the back side of the alternator mounting ear, and sits flush to the block, but doesn't include a tensioning bolt (you need to wedge it over by hand and...
Forum: performance & modifications 05-20-2022, 08:58 AM
Replies: 21
Views: 2,146
Posted By bobxyz
Unless you have extensive Autronic knowledge...

Unless you have extensive Autronic knowledge already, you'll be _way_ better off buying a MicroSquirt and an 8 foot harness with individually labeled wires (~$450), especially around here where there...
Forum: maintenance & nonperformance 05-19-2022, 08:09 PM
Replies: 7
Views: 1,069
Posted By bobxyz
I think the 139 includes dwell control while the...

I think the 139 includes dwell control while the 124 doesn't (or only includes long duration overdwell limiting). The pinout is slightly different - pin5 vs pin6 as EZK input. If the factory EZK...
Forum: maintenance & nonperformance 05-18-2022, 09:04 PM
Replies: 7
Views: 849
Posted By bobxyz
Look on brickboard for a MCC repair FAQ.

Look on brickboard for a MCC repair FAQ.
Forum: maintenance & nonperformance 05-18-2022, 08:44 PM
Replies: 7
Views: 849
Posted By bobxyz
It looks like the MCC module supplies power to...

It looks like the MCC module supplies power to engage the A/C compressor through the A/C pressure sensor. I'd check the wiring around the pressure sensor (by accumulator can), and then trace it over...
Forum: maintenance & nonperformance 05-17-2022, 07:12 PM
Replies: 11
Views: 1,236
Posted By bobxyz
FYI - You can find the LH2.4 fault tracing...

FYI - You can find the LH2.4 fault tracing greenbook under TP31361 at ozvolvo.org/archive/

[Just to sure, the LH2.2 temp sensor looks like the LH2.4 temp sensor but isn't interchangable -- LH2.2...
Forum: website & board 05-13-2022, 07:32 PM
Replies: 52
Views: 3,800
Posted By bobxyz
Thanks Dana, I was going through major withdrawal...

Thanks Dana, I was going through major withdrawal symptoms without my daily+ tbricks fix. :wave:

And I guess what happened in Vegas, may stay in Vegas.
Forum: maintenance & nonperformance 03-21-2022, 10:03 PM
Replies: 11
Views: 702
Posted By bobxyz
Call your local copy shop and ask them if they...

Call your local copy shop and ask them if they can print color transparencies, and if so, how much $ per 8.5 x 11 sheet?
Forum: maintenance & nonperformance 03-18-2022, 04:48 PM
Replies: 9
Views: 967
Posted By bobxyz
IIRC, I had some new pads in a red/black box that...

IIRC, I had some new pads in a red/black box that were too big. It took a while to figure out why it wouldn't go back together, but was obvious when I tried assembling the loose parts into a rotor...
Forum: maintenance & nonperformance 03-16-2022, 07:50 PM
Replies: 6
Views: 819
Posted By bobxyz
I have no idea what that would be on a '76, and...

I have no idea what that would be on a '76, and with only 1 wire connected, it's not doing anything. The CIS Constant Idle Speed box that was added in ~'82 uses a microswitch on the throttle...
Forum: aftermarket engine management 03-16-2022, 07:45 PM
Replies: 5
Views: 751
Posted By bobxyz
Inrush current is mostly an issue when driving...

Inrush current is mostly an issue when driving big capacitive loads or driving motors -- for the motors, once up to speed, the back EMF greatly reduces the effective voltage and current available to...
Forum: performance & modifications 03-16-2022, 07:34 PM
Replies: 19
Views: 1,816
Posted By bobxyz
Thanks, I didn't realize that it would be so...

Thanks, I didn't realize that it would be so easy, and especially that the distributor hold down is a good enough location for a 2nd knock sensor -- I was expecting that the sensor needed to be on...
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