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Turbofrog
Join Date: Aug 2009
Location: Europe
Posts: 1,677
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Hot start trouble. Starts only after pressing FH air plate
When I press the plate I can hear sqeaking. AFR on idle is 13.5 and warm control pressure is 50psi or 3.5 bar. No help pressing the gas pedal when it does not start.
I might still have air leaks but this does not sound like air leak. Timing was at 15btdc and I just changed it to 5 up to 800rpms and 10btdc up to 1200rpms. Any other ideas? I dont have the plunger wire connected and the cold start valve is disconnected also ( shoul not matter on warm start up). No aar or is it aav, only Wur is connected of the original gadgets. I also have my fuel pumps switched next to a start push button and fuel pumps are definately running! The car is not ready for streets yet but I have done 10 meter runs on driveway and it stalls easily on get go (might be air leaks related)
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************************************************** ******************************* 10/78 930: HX40Super, MS3pro+IDX1050+044+E85, ITB, 12 Denso COPs, TrueSplit-BB/2*38WGs, Weight<1100kg Last edited by smurfbus; 06-25-2013 at 11:13 AM.. |
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06-25-2013, 09:53 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Having the same issue right now. What ended up being the problem?
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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10-10-2015, 03:00 AM
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Turbofrog
Join Date: Aug 2009
Location: Europe
Posts: 1,677
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Cant recall but I had the rubber bend after the metering plate hooked up badly at one point. So I beleive it was air leak after all.
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************************************************** ******************************* 10/78 930: HX40Super, MS3pro+IDX1050+044+E85, ITB, 12 Denso COPs, TrueSplit-BB/2*38WGs, Weight<1100kg |
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10-10-2015, 06:38 AM
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Fuel accumulator, thingy by the fuel filter. Try replacing it, I think there is a way to test it but not sure. |
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10-10-2015, 11:39 AM
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The fuel accumulator holds residual pressure for hot start - 20 psi. Only way to test is with CIS gauges as normal, then switch everything off - should hold 20 psi on gauge for half hr or so. The squeeking noise on pushing airplate is your injectors pushing fuel into cylinders. Don't do this for long or you will flood them. All suggests not getting fuel quick enough for hot start (or leaness/airleak) - so the accumulator/Rest pressure is a good place to start.
Regards Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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10-10-2015, 04:22 PM
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Registered
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Fuel pump ?Check-Valve
Could also be the front fuel pump Check-Valve if same as early turbo. There is a check valve in the fitting for the fuel line that screws into the front fuel pump. I think they are about $20-$40 on e-bay.
Rahl |
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10-10-2015, 05:39 PM
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Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,404
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Then you said this: Cant recall but I had the rubber bend after the metering plate hooked up badly at one point. So I beleive it was air leak after all. So what really is the problem? It won't start, or it won't keep running? Tell us again what's really going on.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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10-10-2015, 06:42 PM
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Turbofrog
Join Date: Aug 2009
Location: Europe
Posts: 1,677
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Heh, that was Keniks bump for a two year old tread. I dont remember what it was.
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************************************************** ******************************* 10/78 930: HX40Super, MS3pro+IDX1050+044+E85, ITB, 12 Denso COPs, TrueSplit-BB/2*38WGs, Weight<1100kg |
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10-10-2015, 11:24 PM
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Registered
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If the rest pressure is not holding - then a place to look is the check valve as posted above - that is its function.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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10-10-2015, 11:45 PM
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Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,404
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Quote:
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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10-11-2015, 05:29 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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the original post is 2yrs old.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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10-13-2015, 04:45 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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I was asking, as I was having hot start problems and was looking for a lead on where to start. The good news is that we found it! Looks like there was an obstruction in the control fuel line between the WUR & fuel distributor.
With noting found or left to loose we took the fuel line off, cleaned it with throttle body cleaner, blew it out and now she starts every time. Nothing solid but for sure some corrosion.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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10-13-2015, 01:33 PM
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Registered
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It does sound a bit odd, but good luck if it is working. It would have to suggest your WUR wasn't working properly either - which would have given you a few more headaches. Maybe you gave it just enough of a fright.
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-) |
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10-14-2015, 11:49 AM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Quote:
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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10-14-2015, 11:51 AM
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1988 Porsche 911 Turbo
1976 Porsche 930
