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 Running Rough 
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Running Rough
Good Day,
I just wanted to say hello to all and I am glad to find a forum that I can discuss about the 928. Recently within the last two months I pick up a 1981 Blue on Blue Shark 5 speed. I am currently under the hood quite a bit trying to get it to run well.

It feels like a dog right now and especially at high rpms. I was thinking it may be timing issue but not sure. I replaced the vacuum hoses and fuel filter and maf has been adjusted.

Any help would be great.


Thanks

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Jay

81 Porsche 928
95.5 S6 Wagon
00 S4
72 Audi 100 LS


Fri Oct 14, 2011 9:00 am
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Joined: Mon Jan 07, 2008 8:43 pm
Posts: 2078
Location: Sunny San Diego
Post Re: Running Rough
Is this an 81 US or Euro. Take pics and post them. Also, what is the number stamp on the engine near the top radiator hose? Kinda sounds like a bad O2 Sensor if this is a US Model.

Welcome to the Board!

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1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior


Fri Oct 14, 2011 9:07 am
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Re: Running Rough
It is a US edition and I just replaced the 02 sensor. I also replaced the clutch so that is why I thought the timing maybe the issue.


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Jay

81 Porsche 928
95.5 S6 Wagon
00 S4
72 Audi 100 LS
Fri Oct 14, 2011 9:12 am
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Joined: Mon Jan 07, 2008 8:43 pm
Posts: 2078
Location: Sunny San Diego
Post Re: Running Rough
Any History on this car? Timing Belt, Water Pump? If not, this is priority, then you can your timing on the marks. Also, while your in there, do an Intake Refresh, all new rubber (vac lines, hoses and couplers). Plus the infamous 928 Killer, replace or rebuild your Fuel Hoses on the passenger engine side. They are most likely cracked and ready to burst.

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1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior


Fri Oct 14, 2011 9:17 am
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Re: Running Rough
Timing belt was done by prior owners and the milage is currently at 91,401. I think I will head over and look at the fuel lines and see what I can come up with. Do you think that the fuel distributor could effect this? Also I should have mentioned this but it does take a couple cranks to get it started.

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Jay

81 Porsche 928
95.5 S6 Wagon
00 S4
72 Audi 100 LS


Fri Oct 14, 2011 9:38 am
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Joined: Mon Jan 07, 2008 8:43 pm
Posts: 2078
Location: Sunny San Diego
Post Re: Running Rough
You got an 81 with a Fuel Distributor? Something is not right. Look at your Engine Number and post it. Also, post a pic of your motor

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1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior


Fri Oct 14, 2011 10:02 am
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Re: Running Rough
My fault I meant to say the fuel injection pressure regulator. I will investigate the fuel system because it was not driven that often in the last several years.

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Jay

81 Porsche 928
95.5 S6 Wagon
00 S4
72 Audi 100 LS


Fri Oct 14, 2011 11:19 am
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Joined: Mon Jan 07, 2008 8:43 pm
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Location: Sunny San Diego
Post Re: Running Rough
Whew. Ok, we're on track now. Like I said, do the whole Intake and get your Injectors services. I had mine for the "S" serviced and flow matched by Witch Hunter.

I have to post up the finished product to this thread, but I also had he Spider Powdercoated Gloss Black.

http://porsche928forums.com/viewtopic.php?f=9&t=932&st=0&sk=t&sd=a&start=20

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1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior


Fri Oct 14, 2011 11:31 am
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Granny Driver

Joined: Thu Oct 13, 2011 11:45 am
Posts: 26
Location: Denver Colorado
Post Re: Running Rough
So last night I took the fuel lines/injectors apart on top of the engine and there were some parts that needed new rubber but overall looked good. I also noticed that plug order was wrong on the dis cap. There is a black cover on the cap showing the order in terms of cylinders and someone had put the 7 going to the 4 and Vic versa. Could this have caused major problems?

Last thing I noticed was that there was a pool of gas in the bottom of the throttle housing? Any idea what would be allowing this to happen? The injector distributors have houses going there but that is my best guess. I took a bunch of pics so if needed I can show them.
Thanks

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Jay

81 Porsche 928
95.5 S6 Wagon
00 S4
72 Audi 100 LS


Sat Oct 15, 2011 6:59 am
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Joined: Mon Jan 07, 2008 8:43 pm
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Location: Sunny San Diego
Post Re: Running Rough
Pics always help, so post them. Doesn't matter if they look good. They are 30 year old rubber fuel lines. I did them on my S and it wasn't hard at all. although I am guilty on Euro as I still haven't taken cared of this. I just got past some Smog issues recently. Clean up the fuel under the throttle body using some old rags and monitor, it could just be PO leftovers.

The proper size 5/16" 30R9 Fuel Injection Hose. Use proper Fuel Injection Hose clamps too.


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_________________
1981 Porsche 928 "Euro" 4.5 Litre Auto Gunsmoke Metallic Flat - Black Interrior
1983 Porsche 928S "US" 4.7 Litre Auto Light Bronze (Copper) Metallic - Brown Interior
Sat Oct 15, 2011 7:17 am
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