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930s rule the wasteland
 
h20cooled7's Avatar
 
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Question car is depressing me!

Help
80 930 Car starts fine,idles fine. Engage 1st gear let out clutch start going then I will get a hesitation from 2k up until 2800 then it will run awesome the rest of the rpm range. I have not fooled with the mixture adjustment,and cannot find any vacum leaks.Heres what I have done. Had Brian Leask rebuild my WUR and this has more than doubled my fuel milage. Removed all injectors and checked spray pattern w/ bosch special tool and spray pattern look good with no pissing. R/R all spark plugs with recommended 15$ a pop plugs, and have Clewett wires that have also been done. Adjusted valves to spec cold. I checked CID for 12 volts and ground even swapped out with permatune unit and runs the same way. ohmed out coil ,primary w/in spec but 2ndary was about 750 ohms about 100 ohms out of spec.Has anybody had a similar issue or throw me in a new direction? This is really starting to piss me off!

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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-20-2008, 03:07 PM
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Check fuel filter, with these new fuel's I change mine twice a year.
Old 12-20-2008, 03:18 PM
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Even I replaced about 10k ? Do you notice a performance drop if you dont?
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-20-2008, 03:32 PM
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Check AFR's and also control pressures.

I have a similar problem and I am going to embark on changing almost everything (including a BL WUR) in the endevour to fix my problems.

First and foremost tho AFR and also control pressure readings will probably give a better indication than any other tests.

Have you replaced/upgraded any other components lately? I hope you find out what is causing problems because I think we may be in the same boat.
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'85 930 - Black on Black
'95 993 Turbo - Silver
Old 12-20-2008, 03:52 PM
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I had Brian set my pressures back to stock ,but I can adjust my cold,warm and boost pressures. The car will do it cold or warm and it was doing the same thing b4 I replaced the WUR so thats why im rulling out pressures. If my pressures were off when he set it up to stock it should of brought it back in in therory . I would like to install a Inovate system to adjust pressures but thats after Christmas. Im gonna try the coil for sheets and gigles and fuel filter because this is a cheap route. I have the Porsche shop manuals but they are very choppy and leave you scratching your head. I might have picked up a bad tank of fuel but I would think it would affect the way it runs across the board not at the same point every gear and at the same rpm range.(but thats when I did notice it running like crap) I am a Volkswagen tech and Im pretty decent with CIS but not a a turbo application. Im reallly not feeling firing up the money incinerator because the wife forgot to water the money tree and the damn thing died. But I will keep you posted on my progress and let you know if I luck out. I was also gonna check the diaphram on my dist,but thought the other CID would fix it. Oh well I'll keep you posted on what I find. what are your symptoms?
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-20-2008, 04:15 PM
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Yes I have, replace filter twice a year.Also I run LL av gas mix, seems to help. The gas now a day's is just crap, our car's were built for higher octane than we can get.
Old 12-20-2008, 07:04 PM
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I had a guy swear by a cup of marvel mystery everyfill up,said he never had a problem with cis.
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-21-2008, 03:38 AM
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Could it be a distributor curve thing? Check your spark advance in that rpm range. It that is okay check for a vacuum leak.

diverdan
Old 12-21-2008, 03:38 AM
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Dan, yeah I'll check the diaphram Monday night. I think its totally ignition related. The shop manuals are good..... not great, just wish they would blow over how the systems operate. Is there any porsche training manuals that break down Ignition or turbo systems on the 3.3 turbo? Thats information would be priceless.
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1980 930 Turbo
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1983 944
1984 944
2001 VW golf TDI
Old 12-21-2008, 04:26 AM
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Please note this attachment is for the later 964 3.3, 3.6 turbo, although the ignition system is different along with some other things....
Some info is still the same on earlier 3.3 turbos so you may still find this info usefull in some way or another!!


http://www.adrianstreather.com/docs/Turbo%20technical%20overview.pdf
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"92" 964 turbo,Modified and recently rebuilt using all ARP hardware..
Purpose built fuel controller set up to acheive perfect fuel curve on CIS inj.
Old 12-21-2008, 05:40 AM
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Very cool, Thanks for the info
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-21-2008, 05:51 AM
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When you checked the injector spray pattern, did you also try the fuel flow test, i.e. where you run the injectors for a minute to check volumes across injectors?

edit: just read that other thread about the bad fuel dizzy, and saw you were on there so never mind!
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Last edited by TroyN; 12-21-2008 at 07:12 AM..
Old 12-21-2008, 07:05 AM
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no i didnt check fuel delivery, i just tore the manifold off to check gaskets for intermidiate flange. manifold was tight and gaskets in order but did find fractures in the intermediate flanges but nothing real bad.
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1980 930 Turbo
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1983 944
1984 944
2001 VW golf TDI
Old 12-21-2008, 08:05 AM
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Take a look at the two fuel pump relays . I had same problem .one relay the top came off when removed and some gray resadue inside . replaced it and wala fixed.
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Old 12-21-2008, 01:41 PM
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On it I'll check it out. Thanks Guys the support is Awesome
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-21-2008, 01:44 PM
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connectors are fine but I will recheck relays when I dont have fuel system cracked.
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-21-2008, 02:11 PM
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update to those that are having the same problem. brought fuel meter,intake manifold,and flanges to inspect. the flanges have decent fractures in like 4 of them(I'll post crappy pics of them along with the fuel meter). one of the blocks actually looks melted or bubbled.I have new blocks and gaskets on the way. another thing i noticed while i was cleaning my fuel meter on of the 3 flatheaded screws on the fuel dist was so loose when i blew it with air it was shaking around? retightend and continued to clean injectors out while i have out of car. also checked for any possible air or vacum leaks on manifold just replaced some questionable hoses. thats all i have for know until parts arrive .check the photos out and i'm totally open for comments
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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-22-2008, 02:30 PM
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1980 930 Turbo
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1983 944
1984 944
2001 VW golf TDI
Old 12-22-2008, 02:33 PM
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I replaced those 3 screws that hold the fuel head on with stainless steel allen bolts.
They fit perfect and are so much easier to use.

I think they were 5mm diameter x .8mm thread pitch, and 45mm length.
Old 12-22-2008, 05:35 PM
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if one was loose could this potentially cause a surging problem?

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1980 930 Turbo
1993 Corrado
1983 944
1984 944
2001 VW golf TDI
Old 12-23-2008, 04:47 AM
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