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Showing results 1 to 25 of 387
Search took 0.06 seconds. Search: Posts Made By: DPW928
Forum: Porsche 928 Technical Forum 07-06-2013, 11:23 AM
Replies: 5
Views: 2,383
Posted By DPW928
The two plugs appear to be oil fouled. Try...

The two plugs appear to be oil fouled. Try removing the intake tubes and look for oil residue where the intake valve enters the chamber. If you see oil, it's time for new valve seals
Forum: Porsche 928 Technical Forum 06-14-2013, 05:36 AM
Replies: 5
Views: 1,025
Posted By DPW928
I put a 91 tank in my 78 without any problems....

I put a 91 tank in my 78 without any problems. The only difference is that the newer tanks are molded with a fitting that allows the intake tube to be fastened to the body. i.e. the tanks are...
Forum: Porsche 928 Technical Forum 05-29-2013, 05:49 AM
Replies: 27
Views: 3,051
Posted By DPW928
No fuel when hot normally indicates a leak down...

No fuel when hot normally indicates a leak down in your fuel system. This could be caused by a bad check valve at the fuel pump, a leaking fuel accumulator, injector(s) leaking fuel into the...
Forum: Porsche 928 Technical Forum 04-26-2013, 05:40 AM
Replies: 27
Views: 3,051
Posted By DPW928
Even a small fuel leak is enough to reduce the...

Even a small fuel leak is enough to reduce the system pressure and cause a hard warm start. Try tightening the connection at the top of the injector. A bad seal around the injector won't cause a fuel...
Forum: Porsche 928 Technical Forum 04-14-2013, 08:42 AM
Replies: 9
Views: 907
Posted By DPW928
MPDano, I've had good luck cleaning them by...

MPDano,

I've had good luck cleaning them by letting them soak in cleaner then forcing the cleaner through them with at least 60 psi of air pressure to open the pintle. Sometimes I have to repeat...
Forum: Porsche 928 Technical Forum 04-13-2013, 08:43 AM
Replies: 9
Views: 907
Posted By DPW928
A dry and clean sparkplug indicates a plugged...

A dry and clean sparkplug indicates a plugged injector. A partially plugged injector will normally show signs of blistering on the plug insulator due heat and preignition from lean running. A couple...
Forum: Porsche 928 Technical Forum 04-13-2013, 06:57 AM
Replies: 9
Views: 907
Posted By DPW928
The CIS tester cannot tell you if an injector is...

The CIS tester cannot tell you if an injector is bad. It measures system and control pressures only. The system pressure is regulated by the relief valve in the fuel distributor and the control...
Forum: Porsche 928 Technical Forum 03-28-2013, 05:53 AM
Replies: 7
Views: 1,104
Posted By DPW928
Agree with Pete R. Also check/clean the ground...

Agree with Pete R. Also check/clean the ground wire at the sender and where it connects to the body.
Forum: Porsche 928 Technical Forum 03-25-2013, 07:22 AM
Replies: 20
Views: 5,425
Posted By DPW928
It would still have retarded timing but not as...

It would still have retarded timing but not as much as WOT. Also, the engine needs more advance to accelerate than it does to cruise.
Forum: Porsche 928 Technical Forum 03-25-2013, 06:03 AM
Replies: 20
Views: 5,425
Posted By DPW928
The problem you are having could also be due to...

The problem you are having could also be due to the vacuum lines to the distributor being reversed.
Forum: Porsche 928 Technical Forum 02-17-2013, 10:21 AM
Replies: 83
Views: 11,174
Posted By DPW928
No trick. If I can do it anyone can. Just take it...

No trick. If I can do it anyone can. Just take it slow, clean all surfaces, make sure the o rings are the correct size and recheck everything. The most common problem in DIY rebuilds comes from fuel...
Forum: Porsche 928 Technical Forum 02-17-2013, 08:50 AM
Replies: 83
Views: 11,174
Posted By DPW928
Just a side note for anyone adjusting their...

Just a side note for anyone adjusting their control pressure (WUR) or system pressure (regulator on the distributor). After changing either pressure, the A/F mixture will need to be reset.

For...
Forum: Porsche 928 Technical Forum 02-15-2013, 10:05 AM
Replies: 83
Views: 11,174
Posted By DPW928
Airtek, If you get an MB distributor, you...

Airtek,

If you get an MB distributor, you will need to adjust the A/F mixture with the adjustor on the upper plenum due to the different geometries. The A/F mixture can be adjusted without the...
Forum: Porsche 928 Technical Forum 02-14-2013, 07:19 PM
Replies: 83
Views: 11,174
Posted By DPW928
There shouldn't be a vacuum in the tank if the...

There shouldn't be a vacuum in the tank if the lines are clear. You may want to check all your lines and inlets/outlets at the top on the fuel sending unit and between the fill tube and the back of...
Forum: Porsche 928 Technical Forum 02-14-2013, 01:57 PM
Replies: 83
Views: 11,174
Posted By DPW928
Also, remove the fuel regulator off the back of...

Also, remove the fuel regulator off the back of the distributor, check the o rings and spray injector cleaner into the ports. It's possible the regulator was stuck open letting system pressure bleed...
Forum: Porsche 928 Technical Forum 02-14-2013, 08:51 AM
Replies: 83
Views: 11,174
Posted By DPW928
Airtek, Boises problem was the engine ran...

Airtek,

Boises problem was the engine ran alright when cold but went lean as it warmed up. From reading your thread, your engine is starting with fuel from the cold start valve but you are getting...
Forum: Porsche 928 Technical Forum 02-09-2013, 11:43 AM
Replies: 26
Views: 1,560
Posted By DPW928
Two pumps were only installed by the factory for...

Two pumps were only installed by the factory for early 928's destined for hot environments so yours would probably function OK with just the external pump. I would remove the internal pump assembly...
Forum: Porsche 928 Technical Forum 02-09-2013, 10:03 AM
Replies: 26
Views: 1,560
Posted By DPW928
IIRC there is a common ground point behind the...

IIRC there is a common ground point behind the tool panel at the rear of the hatch. May want to check it.
Forum: Porsche 928 Technical Forum 02-09-2013, 08:45 AM
Replies: 26
Views: 1,560
Posted By DPW928
Not sure how the wiring loom is laid out. Did you...

Not sure how the wiring loom is laid out. Did you trace the ground wire off the pump to the body to check its connection? IIRC it connects at an area separate from the rear lights. Also, did you...
Forum: Porsche 928 Technical Forum 02-09-2013, 07:58 AM
Replies: 26
Views: 1,560
Posted By DPW928
Did you check the voltage at the small connectors...

Did you check the voltage at the small connectors at the pump? The 928 is set up for Bosch pumps which use a smaller connector for the positive and a larger connector for the ground.

On your...
Forum: Porsche 928 Technical Forum 12-11-2012, 02:06 PM
Replies: 9
Views: 3,948
Posted By DPW928
All of the above. LOL Actually each bulb...

All of the above. LOL

Actually each bulb has its own fuse, so I would check the fuse to make sure it is not burn out and no corrosion at the contacts on each end.

To check the bulb and...
Forum: Porsche 928 Technical Forum 12-11-2012, 10:20 AM
Replies: 9
Views: 3,948
Posted By DPW928
If either switch detects pressure you should get...

If either switch detects pressure you should get power to both brake light circuits. Since one light is working, the new switches are functioning. I would check the fuse, bulb, bulb connections and...
Forum: Porsche 928 Technical Forum 11-26-2012, 05:44 AM
Replies: 6
Views: 980
Posted By DPW928
There may be too large of a gap between the pedal...

There may be too large of a gap between the pedal adjustment rod and the clutch master cylinder which could cause the click. The original WSM said to allow .004" gap but IIRC in 91 the manual was...
Forum: Porsche 928 Technical Forum 11-26-2012, 05:26 AM
Replies: 9
Views: 3,948
Posted By DPW928
The corrosion could very well be the cause of no...

The corrosion could very well be the cause of no brake lights. If you braking is OK the master cylinder probably just needs cleaned up and painted.
Forum: Porsche 928 Technical Forum 11-24-2012, 06:35 AM
Replies: 9
Views: 3,948
Posted By DPW928
The early 928's had two switches on the inboard...

The early 928's had two switches on the inboard side of the brake master cylinder. There are three electrical connections on each switch. One switch senses pressure on the rear brakes and one for the...
Showing results 1 to 25 of 387
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