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Search: Posts Made By: Dennis Wilson
Showing results 1 to 25 of 498
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Forum: 928 Forum
03-18-2017, 11:21 PM
Replies: 6
Views: 737
Posted By Dennis Wilson

The CIS fuel system uses a higher pressure pump...

The CIS fuel system uses a higher pressure pump than later models.
Forum: 928 Forum
09-29-2014, 09:55 AM
Replies: 24
Views: 2,295
Posted By Dennis Wilson

If none of the other suggestions work out, check...

If none of the other suggestions work out, check the cat/exhaust system for partial blockage.
Forum: 928 Forum
06-22-2014, 10:13 AM
Replies: 4
Views: 567
Posted By Dennis Wilson

Check your resistors for the 15 and 16 circuit...

Check your resistors for the 15 and 16 circuit that powers the coil. Cranking goes through one resistor which appears to be OK, but when the key is moved back to run, the 15 circuit goes through both...
Forum: 928 Forum
04-17-2014, 11:09 AM
Replies: 10
Views: 1,125
Posted By Dennis Wilson

When you rebuilt the FD, did you check the o...

When you rebuilt the FD, did you check the o rings and seats on the relief valve? A leak at the valve can cause a loss of pressures due to fuel leaking into the retuen lines.

Dennis
Forum: 928 Forum
01-30-2014, 10:07 AM
Replies: 16
Views: 1,137
Posted By Dennis Wilson

Did you check the voltage at the coil when the...

Did you check the voltage at the coil when the key was in the crank position? If you got 6 to 9 volts, the ignition switch is OK and the problem is either low voltage to the starter solenoid or a bad...
Forum: 928 Forum
01-10-2014, 10:31 PM
Replies: 35
Views: 10,231
Posted By Dennis Wilson

Colin, On my 78 euro the machine shop found...

Colin,

On my 78 euro the machine shop found 2 valve springs below spec. There was no indication of valves hitting the pistons but with the heads being milled and a potential for carbon buildup, we...
Forum: 928 Forum
01-10-2014, 10:09 PM
Replies: 35
Views: 10,231
Posted By Dennis Wilson

Jim, guess Porsche put the valve tension spec's...

Jim, guess Porsche put the valve tension spec's in the manual for nothing. Just because your very old brown has been well maintained doesn't mean all the 928's have been. Running too hot for too long...
Forum: 928 Forum
01-10-2014, 08:59 PM
Replies: 35
Views: 10,231
Posted By Dennis Wilson

Weak valve springs can also increase valve lash...

Weak valve springs can also increase valve lash enough to cause contact.

Dennis
Forum: 928 Forum
09-13-2013, 12:53 AM
Replies: 16
Views: 2,162
Posted By Dennis Wilson

It is possible the A/F mixture was previously...

It is possible the A/F mixture was previously richened to compensate for a vacuum leak. Now that you have replaced the lines, the mixture may need reset. A basic running adjustment may be made by...
Forum: 928 Forum
09-09-2013, 09:04 PM
Replies: 16
Views: 2,162
Posted By Dennis Wilson

A bad thermotime switch can cause the cold start...

A bad thermotime switch can cause the cold start valve to inject continuously. Try unplugging the injector after a cold start to see if the rich running goes away. If it leans it out, replace the...
Forum: 928 Forum
09-02-2013, 07:17 PM
Replies: 40
Views: 3,294
Posted By Dennis Wilson

The control pressure appears to be too low at 10...

The control pressure appears to be too low at 10 psi. It should vary from 15 to 50 psi dependent upon temperature. Have you cleaned the inlet and outlet ports of the WUR. Also, since the air sensor...
Forum: 928 Forum
08-19-2013, 09:42 PM
Replies: 12
Views: 1,873
Posted By Dennis Wilson

Spun, They couldn't be WWII as the NATO...

Spun,

They couldn't be WWII as the NATO country code (12 for Germany) wasn't incorporated into the NSN's until the 1970's. BTW bandages over 10 years old should not be used as old cotton can...
Forum: 928 Forum
08-19-2013, 12:02 AM
Replies: 12
Views: 1,873
Posted By Dennis Wilson

The first kits pictured were not made for...

The first kits pictured were not made for Porsche. They were made for the German military. The stenciled number starting with 6545-12 is a US/NATO National Stock Number (NSN). The picture brought...
Forum: 928 Forum
08-12-2013, 10:53 PM
Replies: 13
Views: 1,466
Posted By Dennis Wilson

The 78 models came from the factory with fuel...

The 78 models came from the factory with fuel pumps that had internal check valves and are not replaceable. Many have been replaced with later pumps that have external check valves. The pumps with...
Forum: 928 Forum
08-11-2013, 11:34 PM
Replies: 9
Views: 788
Posted By Dennis Wilson

The procedure Jpitman described is the only way...

The procedure Jpitman described is the only way to set the A/F mixture on a non-running CIS system. Lateral and vertical adjustments may be required on other cars (MB, Audi or VW's) but the 924 and...
Forum: 928 Forum
08-11-2013, 08:12 PM
Replies: 9
Views: 788
Posted By Dennis Wilson

The only air sensor plate adjustments on the 928...

The only air sensor plate adjustments on the 928 is centering of the plate in the venturi. The lever from the control piston to the plate has a set length and mounting points. Have you tried...
Forum: 928 Forum
07-21-2013, 11:08 AM
Replies: 40
Views: 3,294
Posted By Dennis Wilson

The resistance on the air sensor plate is due to...

The resistance on the air sensor plate is due to control pressure in the fuel distributor. Have you gotten a gauge to measure your system and control pressures?

Dennis
Forum: 928 Forum
07-20-2013, 10:52 PM
Replies: 40
Views: 3,294
Posted By Dennis Wilson

Jay, Not sure about the ROW CIS cars but all...

Jay,

Not sure about the ROW CIS cars but all the US CIS Porsches have this to prime the system before start up. It probably has to do with the US specs that require the fuel pump to be off on a...
Forum: 928 Forum
07-20-2013, 09:33 PM
Replies: 40
Views: 3,294
Posted By Dennis Wilson

Check the red wires going into the bottom of the...

Check the red wires going into the bottom of the fuse panel for 12 volts. If all have 12 volts, remove the panel and look for loose/corroded connections. If less than 12 volts on all/any of the red...
Forum: 928 Forum
07-10-2013, 11:35 PM
Replies: 40
Views: 3,294
Posted By Dennis Wilson

When you replace the fuse, make sure to get the...

When you replace the fuse, make sure to get the ceramic type with the copper element like the 928 vendors sell. Since the fuses have a very small contact point/ring, the plastic with aluminum element...
Forum: 928 Forum
03-24-2013, 01:28 PM
Replies: 75
Views: 16,472
Posted By Dennis Wilson

Dan, Since you were missing the small o ring...

Dan,

Since you were missing the small o ring on the relief valve plunger, it has probably broken up and stuck in the FD return manifold or in the return line. This would cause your high system...
Forum: 928 Forum
03-03-2013, 11:54 AM
Replies: 20
Views: 6,379
Posted By Dennis Wilson

LT, It sounds like the heater winding has...

LT,

It sounds like the heater winding has fried and is shorting to the body of the AAV. You can check it by testing for a circuit from the positive connector to the body of the AAV.

Dennis
Forum: 928 Forum
01-22-2013, 12:00 AM
Replies: 6
Views: 914
Posted By Dennis Wilson

In my 12 years on Rennlist I've seen the 924 vs...

In my 12 years on Rennlist I've seen the 924 vs 928 development argument at least 6 times. The Porsche project numbers were assigned sequentially, so the #924 was given to engineering before #928....
Forum: 928 Forum
10-31-2011, 10:57 AM
Replies: 14
Views: 1,455
Posted By Dennis Wilson

Pushing down on the A/F adjuster causes the air...

Pushing down on the A/F adjuster causes the air sensor plate to raise the piston and richens the mixture. On cold starts this is normally accomplished by the cold start valve. Have you checked the...
Forum: 928 Forum
08-14-2011, 12:26 AM
Replies: 21
Views: 2,295
Posted By Dennis Wilson

Did you install the piston upside down?

Did you install the piston upside down?
Showing results 1 to 25 of 498
 
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