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Search: Posts Made By: dr bob
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Forum: 928 Forum
06-22-2021, 02:44 PM
Replies: 253
Views: 17,044
Posted By dr bob

I thought I was reading that you are not able to...

I thought I was reading that you are not able to get both the required flow and system pressure to happen at the same time. Was I not reading that correctly? My suggestions for diagnosing are based...
Forum: 928 Forum
06-22-2021, 02:20 PM
Replies: 16
Views: 1,263
Posted By dr bob

Looking at Tire rack, there are a few more...

Looking at Tire rack, there are a few more options: https://www.tirerack.com/tires/TireSearchResults.jsp?zip-code=07928&width=245/&ratio=45&diameter=16&rearWidth=245/&rearRatio=45&rearDiameter=16
Forum: 928 Forum
06-22-2021, 12:40 PM
Replies: 2
Views: 420
Posted By dr bob

Lighting systems for 1981 cars consume four pages...

Lighting systems for 1981 cars consume four pages of workshop manual diagrams, more than I'm willing to casually post here. Meanwhile, there's a pretty high-quality scanned set of manuals available...
Forum: 928 Forum
06-22-2021, 12:07 AM
Replies: 3
Views: 459
Posted By dr bob

This was tailed on a 6 year old thread on...

This was tailed on a 6 year old thread on insurance and repair strategies. It deserves its own thread.
Forum: 928 Forum
06-21-2021, 09:25 PM
Replies: 16
Views: 1,487
Posted By dr bob

Foolishly, bob suggests that a compression gauge...

Foolishly, bob suggests that a compression gauge might be a handy tool to help discover leaks between the coolant passages and the combustion chambers. You are halfway there with the old plugs out. ...
Forum: 928 Forum
06-21-2021, 09:22 PM
Replies: 253
Views: 17,044
Posted By dr bob

The S pipe between pump and filter accepts the...

The S pipe between pump and filter accepts the same banjo bolt and fittings you use at the WUR, so it's an easy place to test for pump discharge pressure with nothing in between. It's a convenient...
Forum: 928 Forum
06-21-2021, 04:24 PM
Replies: 17
Views: 1,091
Posted By dr bob

The LED won't pass enough current to "light off"...

The LED won't pass enough current to "light off" the alternator excitation. You might try adding another resistor in parallel with the 68-Ohm resistor that's already in parallel with the bulb, or...
Forum: 928 Forum
06-21-2021, 04:09 PM
Replies: 29
Views: 1,713
Posted By dr bob

There was never a 7" H4 option on the cars. ...

There was never a 7" H4 option on the cars. Factory H4 cars came with the 8" version. When the cars were first introduced, the US was still clinging to the idea that all headlights needed to be...
Forum: 928 Forum
06-21-2021, 03:33 PM
Replies: 253
Views: 17,044
Posted By dr bob

Gerrit -- I'd start by making sure that the...

Gerrit --

I'd start by making sure that the pump can deliver the required pressure while dead-headed (outlet completely blocked briefly, no flow at all). Then move to making sure that it has the...
Forum: 928 Forum
06-21-2021, 02:53 PM
Replies: 64
Views: 3,842
Posted By dr bob

Mark, these aren't "guesses", they are pointers...

Mark, these aren't "guesses", they are pointers to help you think about the system as a whole, and maybe how some simple damage in storage (mouse damage?) would offer the symptom you describe. The...
Forum: 928 Forum
06-21-2021, 02:14 PM
Replies: 64
Views: 3,842
Posted By dr bob

Mark -- I know the whole engine doesn't...

Mark --

I know the whole engine doesn't start thing can be really frustrating for you. At the same time, a [shrinking] group here is more than willing to help you, but we are a bit hamstrung by...
Forum: 928 Forum
06-20-2021, 03:11 PM
Replies: 253
Views: 17,044
Posted By dr bob

Gerrit -- The pressure regulator controls...

Gerrit --

The pressure regulator controls the pressure that pump sees, by sending all fuel that doesn't go through the injectors back to the tank. The test for volume at correct primary pressure...
Forum: 928 Forum
06-20-2021, 02:47 PM
Replies: 20
Views: 2,389
Posted By dr bob

I see a vacuum line running to the brake booster...

I see a vacuum line running to the brake booster connection. Can't miss that bright red hose... Is that a reference for fuel pressure? If so, that's a poor place to connect. I'm not familiar with...
Forum: 928 Forum
06-20-2021, 02:39 PM
Replies: 17
Views: 1,091
Posted By dr bob

A reminder that there's a separate resistor on...

A reminder that there's a separate resistor on the cluster backplane, in parallel with the bulb, that's needed to provide the proper initial excitation to get the alternator going from a start.
...
Forum: 928 Forum
06-18-2021, 08:48 PM
Replies: 73
Views: 4,728
Posted By dr bob

Caliper grease would probably be OK. Remember...

Caliper grease would probably be OK. Remember that you are trying to lubricate and preserve the o-ring, and keep the hole from getting smaller with oxidation. The sensor itself is a smooth barely...
Forum: 928 Forum
06-18-2021, 07:51 PM
Replies: 73
Views: 4,728
Posted By dr bob

More: It will be interesting to follow up on all...

More: It will be interesting to follow up on all this diagnosis. A failed CPS usually manifests as no fuel pump relay close, and missing injection and ignition function since the position in crank...
Forum: 928 Forum
06-18-2021, 07:48 PM
Replies: 73
Views: 4,728
Posted By dr bob

For future efforts, consider adding a little...

For future efforts, consider adding a little silicone grease to the CPS, and make sure the hole is clean and smooth. The Dow-Corning DC111 that Stan recommends is perfect for the duty, as is...
Forum: 928 Forum
06-18-2021, 04:43 PM
Replies: 16
Views: 1,263
Posted By dr bob

The S4 cars came with staggered 16" wheel widths,...

The S4 cars came with staggered 16" wheel widths, so the wider rear tire is appropriate. The original 245/45-16 rear size was shared with period 911 turbo cars, so there's still some market to get...
Forum: 928 Forum
06-18-2021, 04:34 PM
Replies: 253
Views: 17,044
Posted By dr bob

Gerrit -- The flows you see directly from...

Gerrit --

The flows you see directly from the pump are to be expected. The Real Test is from the return flow after the fuel pressure regulator, with primary pressure set correctly. That tests...
Forum: 928 Forum
06-18-2021, 04:21 PM
Replies: 14
Views: 770
Posted By dr bob

When cleaning in the V, avoid petro solvents and...

When cleaning in the V, avoid petro solvents and brake cleaner if you can, in favor of a detergent and water. The petro products and especially the low boilers like brake cleaner will take a toll on...
Forum: 928 Forum
06-18-2021, 02:44 PM
Replies: 9
Views: 614
Posted By dr bob

For many tint removal challenges, remember that...

For many tint removal challenges, remember that almost all tint adhesive will come off with an ammonia/water solution. Easiest if the hatch is off the car, where you can flip it over, spray the tint...
Forum: 928 Forum
06-18-2021, 02:34 PM
Replies: 17
Views: 1,209
Posted By dr bob

As Nick suggests in his LH comment, a failing...

As Nick suggests in his LH comment, a failing controller will cause the symptoms you shared. If the controller hasn't been reworked already (check for repair/warranty sticker from the rebuilder...)...
Forum: 928 Forum
06-18-2021, 02:19 PM
Replies: 26
Views: 1,492
Posted By dr bob

Know that if you had the cylinder heads reworked,...

Know that if you had the cylinder heads reworked, there are some critical pieces in the oil system/passages that can be left out and will cause low oil pressure. I don't have the WSM pages in front...
Forum: 928 Forum
06-17-2021, 11:01 PM
Replies: 6
Views: 875
Posted By dr bob

Our vendors offer them. Try, in no particular...

Our vendors offer them. Try, in no particular order, 928 International (RL: Mark Anderson), 928SRUS (RL: ROG100), and Greg Brown (RL: GregBBRD). Some have sourced the wire and connectors...
Forum: 928 Forum
06-17-2021, 10:54 PM
Replies: 40
Views: 1,449
Posted By dr bob

If it works now, it's right! There's a 944...

If it works now, it's right!

There's a 944 sender that will work with some help, if you find yourself in a hole. Our favorite sponsor/vendors can guide you.


Housekeeping: We've strayed from...
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