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928 Mechanical restoration - Reliability? (1981model)

I'm new to 928 ownership although not new to Pelican having saved a 73 911.

I didn't buy this car because I wanted a cheap sportscar, but because I wanted a 928 that I could drive reliably.

While I don't want to wast money, I don't want to be cheap and shoot myself in the foot, so preventative maintenance is what I am planning. I see the sticky thread on common issues, but I'd like to baseline the car and create a brief paint by numbers list for myself of what to take care of before it causes problem, so if you want to contribute please jump in.

(I see lots of relay problems for instance, and wonder if I shouldn't just try to replace them all and keep the old ones as spares? ... or at least the ones that would make it non drivable (things that would stop the fuel pump and injectors from working for instance)

Here is my list of accomplishments so far, working from back to front with the fuel system. What else in order of while I am in there, or in order of importance?
  1. Replace leaking gas tank
  2. replace fuel pump
  3. replace filter
  4. replace all rear hoses by the tank
  5. fix connectors and brittle wire near the fuel pump
  6. ???
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Last edited by wayner; 02-05-2018 at 11:49 AM..
Old 02-05-2018, 11:16 AM
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Old 02-05-2018, 11:17 AM
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Nice car, I've always wanted a gaurds red 928. I would start at the grounds, clean them all very well along with the 14 pin connector. Those two areas seem to cause a huge amount of issues in these cars. The fuel hoses in the engine compartment are also prone to failure if they are original. Roger @ 928's R Us has the fuel hoses and tons of other parts you will need. If you need used parts Garage 928 on FB has a huge selection of good used parts along with 928 International of course.

Ramon
Old 02-05-2018, 12:45 PM
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A thorough professional inspection by someone expert in the 928 is the best initial investment. Anyone with a helper can take about an hour off the normal time by doing all the basics like checking switches, lights, and fluids.

Fuel injection hoses under the hood are item one.

Replacing all the relays should stimulate the economy, not a "bad" idea, just expensive when the primary need is to clean all the contacts. Many here like the Caig products like deoxit.

Replace the ground strap on the battery, do the ground service and make sure it has a good battery, then drive it a lot and fix anything you notice.
Old 02-05-2018, 08:40 PM
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Quote:
Originally Posted by Danglerb View Post
A thorough professional inspection by someone expert in the 928 is the best initial investment. Anyone with a helper can take about an hour off the normal time by doing all the basics like checking switches, lights, and fluids.

Fuel injection hoses under the hood are item one.

Replacing all the relays should stimulate the economy, not a "bad" idea, just expensive when the primary need is to clean all the contacts. Many here like the Caig products like deoxit.

Replace the ground strap on the battery, do the ground service and make sure it has a good battery, then drive it a lot and fix anything you notice.
+928 Very good advice posted here!!
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Old 02-06-2018, 08:55 AM
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Thanks everyone

In anticipation I already ordered and received upgraded brakes from a newer model ( to replace seized calipers. They’ll get put in a box and reconditioned one day if keeping it original makes sense in the future

I’ve also got ALL belts and hoses and lines for replacement

I think that’s just prudent on any car this age

Are relays even much if an issue or do problems stem from corrosion of grounds and connectors leading up to the relays?

( I’m already skilled at cleaning up grounds as I had a late model Honda motorcycle where the frame was painted by the factory covering all ground points that never had the paint removed before screwing down lugs

As far as a 928 expert, the car got a cursory once over, but I’m mainly looking for a more comprehensive list of preventive tasks rather than waiting for failures

The car is old, clean and seems reliable and well cared for but deserves some TLC to keep it that way, but it seems that aside from replacing old rubber, cleaning up the electrical is where it’s at?


Thanks for the product and vendor recommendations
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Last edited by wayner; 02-06-2018 at 02:15 PM..
Old 02-06-2018, 02:13 PM
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Quote:
Originally Posted by wayner View Post
Are relays even much if an issue or do problems stem from corrosion of grounds and connectors leading up to the relays
Short answer is: Yes, relays can be a problem. Replace the relays that concern the vehicle running:

Fuel Pump (XVII) next to large relay at bottom right (928.615.113.01
Fuel Injection (XVI) 4th from the right on top row (928.615.119.00)
Ignition/Starter (XIV) 5th from the right on top row (928.615.117.00)

If it ran before you replaced these relays, you can keep the old relays as back up spares only.

Replace any other relays as necessary.
Spin your fuses around in the fuse holder to get a good connection initially, but plan to clean and polish the fuse holders at some point.

The more you drive your car, the better it will run generally.

These cars like to be driven!
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Old 02-06-2018, 04:12 PM
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Nice car! Is it a 5-speed, or automatic?

As others have already stated, a good all-around electrical system/contact cleaning and inspection goes a long way on these cars.

Also a good idea to check the condition of the "green wire" which runs from the ignition distributor to the ignition control module on the passenger side of the engine bay. If this wire fails, your engine won't run!

If it's a 5-speed car, plan on replacing the clutch master and slave cylinders, unless they were already replaced recently.

Post up some engine pictures!
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Old 02-06-2018, 06:18 PM
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Thanks!

I know what you mean

I’ve already experienced how they like to run when a few dropped cylinders finally started firing while idling waiting for the trailer after the tank and fuel pump were replaced

Thanks for the relay advice

P.S.
Yes 5 speed
Engine needs a good cleaning from storage
I’ll grab some pics this weekend
Good thinking on the clutch components, master and slave should be easy

Tranny is weeping so I’ll likely pull it and refurbish it next season
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Last edited by wayner; 02-06-2018 at 06:50 PM..
Old 02-06-2018, 06:37 PM
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clutch slave is easy to get to...clutch master..not so much
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Old 02-07-2018, 08:18 AM
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So since you have a 5-speed, I would highly recommend removing/inspecting the clutch assembly when you have a chance. A little bit of fresh lubricant on the clutch shaft and release fork pivot points goes a long way for longevity and smooth operation. With the high prices of clutch components for these cars, you don't want to wear anything out unnecessarily. I would recommend replacing the release bearing and pilot bearing while you are in there, especially if they are old. Also renew the plastic pivot bushing for the clutch fork. If the clutch fork is worn where it contacts the release bearing, it can be welded up and filed down to it's original profile pretty easily. I've found on several cars that it makes a difference in clutch operation and driveability.
Old 02-07-2018, 09:26 AM
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Ok, here is my list so far:

COMPLETED:
  • Replace leaking gas tank
  • replace fuel pump
  • replace filter
  • replace all rear hoses by the tank
  • fix connectors and brittle wire near the fuel pump


TO DO:
  • All engine compartment hoses and belts
  • Water pump (while I am in there)
  • Brakes and lines

Electrical
  • Clean grounds
  • Clean fuses and holder
  • Fuel Pump relay (XVII) next to large relay at bottom right (928.615.113.01
  • Fuel Injection relay (XVI) 4th from the right on top row (928.615.119.00)
  • Ignition/Starter relay (XIV) 5th from the right on top row (928.615.117.00)

Future:
  • Clutch (see prev posts for parts to refurbish)
  • Inspect rad, replace with aluminum?

Harebrained idea that may never happen or maybe should never happen:
  • Recover seats in Pasha and install phone dials in place of black leather and manhole covers
This should keep my busy for a while
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Last edited by wayner; 02-07-2018 at 03:43 PM..
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