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> 914 Decel Valve, NLA?
smooth_eddy
post Jul 10 2005, 01:26 PM
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Last time I took my car into the shop I had them put on a decel valve. The car came w/o one. I was told the 914 decel valve is NLA. So a 911 valve was installed. Well the car no longer dies at stop signs, but idles really high for 30 seconds or so. Finally it will settle down to 900 RPM. Do I need to find a 914 decel valve to get a good idle?
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bd1308
post Jul 10 2005, 02:50 PM
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sounds like your car is working as it should....how high is "really high"
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SirAndy
post Jul 10 2005, 04:53 PM
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QUOTE (smooth_eddy @ Jul 10 2005, 12:26 PM)
but idles really high for 30 seconds or so

i should not take that long for the DV to wind down the rpm. it should be smooth decel as soon as you lift off the throttle ...

stupid question: why did you opt to add one? i like the more responsive throttle without the DV much better anyways ...

(IMG:http://www.914world.com/bbs2/html/emoticons/cool.gif) Andy
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qa1142
post Jul 10 2005, 06:26 PM
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(IMG:http://www.914world.com/bbs2/html/emoticons/agree.gif)

I pulled my decel valve on recomendation of Porsche Factory trained mechanic. First theing they did when selling new 914's before they even left the dealership.

Check for other problems if you car won't idle (IMG:http://www.914world.com/bbs2/html/emoticons/wacko.gif)

Djet or L jet????
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bd1308
post Jul 10 2005, 06:37 PM
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well going upon his signature, it's a D-Jet.....

personally I'd check the timing and dwell and idle...
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smooth_eddy
post Jul 10 2005, 10:06 PM
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QUOTE
sounds like your car is working as it should....how high is "really high"


At a stop light, the idle is 18-2200 RPM.

E
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skline
post Jul 10 2005, 10:09 PM
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QUOTE (smooth_eddy @ Jul 10 2005, 09:06 PM)
QUOTE
sounds like your car is working as it should....how high is "really high"


At a stop light, the idle is 18-22k RPM.

E

How does it not blow up? I dont even know any cars that run that high.
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smooth_eddy
post Jul 10 2005, 10:09 PM
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QUOTE
stupid question: why did you opt to add one?


The car idled fine w/o the decel valve. But when I came to a stop quickly the motor always died. I have an aluminum flywheel and was told my RPM's dropped too fast, so I needed the decel valve.
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smooth_eddy
post Jul 10 2005, 10:10 PM
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QUOTE
How does it not blow up? I dont even know any cars that run that high.


Oops... fixed my post
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bd1308
post Jul 10 2005, 10:14 PM
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does it only happen when engine is cold, or all the time....


dude bump the idle up and toss the DV.....
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smooth_eddy
post Jul 10 2005, 10:17 PM
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QUOTE
does it only happen when engine is cold, or all the time....


happens all the time.
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bd1308
post Jul 10 2005, 10:18 PM
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i'd just bump the idle up and toss the decel valve....

timing might be fuched up.
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smooth_eddy
post Jul 10 2005, 10:20 PM
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Just checked my email. The PO (a club member) said the idle problem might be to a leaking injector.
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bd1308
post Jul 10 2005, 10:20 PM
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woah....thats cool and wierd.
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dmenche914
post Jul 10 2005, 11:13 PM
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my 914 did not have a decel valve on it, however your aluminum flywheel might make one needed,

Could be the decel valve is: a. broekn, and taking to long to slow the engine down. or b. the 911 valve you have is just to much of a slow decel for the 914. After all does it not work on a vacuum principle? I bet a 911 six draws at the rpms, and displacements they run, a tad bit more vaccum than a 914. thus the decel valve is made to let more air flow on the 911 (just a hunch, comments???)

One thing to try is a used 914 decel vale from someone, maybe that will help, and make it run right.

If even a stock decel valve is too much for you lightend flywheel, try restricing the rubber hose that goes tot he intake. that "might" have an effect, maybe a clothes pin clamping he hose will reduce the air bypasssing the throotle such the engine settles to idle faster.

anyway try that, the pinching off the line a bit trick it might just do it for you, it's cheap and easy to to find out.


good luck
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North Bay 914
post Jul 10 2005, 11:42 PM
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This car does not have an aluminum flywheel...it has a 13 pound Bontempi flywheel, an a 911S aluminum pres. plate and

matching lightweight 911S disc, almost a grand all that cost me....which I wish I had back right now, and would never

cause this problem, it never needed a decel valve for this, and this problem I would bet is vacuum leak related in some

way, more than likely a sticking aux. air valve, or loose hose. After this car left my possesion, someone told me

(Brad Roberts) that the only issue I had with the engine (after spending nearly $5000.00 on it anf the gearbox)

was more than likely an injector leaking after closing. That problem was a mild bucking unless the ECU was slightly

enrichened. The extra fuel released caused the engine to speed up mometarily. I agree with this theory, and never had the

oppurtunity to find out if that was indeed the problem.
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North Bay 914
post Jul 10 2005, 11:51 PM
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By the way, if any one needs one of these paperwieght 914 decel valves, let me know, I have 4 or 5 of them, doing what they do best... far way from a d-jet engine...FYI all for every one who thinks you need this on your car, it was NOT installed on the Euro/ROW cars. What they do best is provide an excellent source for another vacuum leak.
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North Bay 914
post Jul 11 2005, 12:05 AM
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For future reference on my old car...

Flat top 2056, 8.7 to 1 compression ratio
Ported heads
Web #73 Grind D-jet camshaft
911 swivel foot rockers
Perfomance double valve springs, height matched and pressure balanaced
New everything in the cylinder heads, minus exhaust valves, as I wanted to retain the sodium filed stem type
Align bored case
Crankshaft trued/turned
Rods reconditioned/ARP bolts
Matched injectors
Lighten flywheel 13 lbs
911S clutch assembly
Pertronix ignition

Built at EBS racing in Reno.
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Bleyseng
post Jul 11 2005, 06:38 AM
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Smooth Eddy. I could look at your car this week and check it out. I even have a couple of 914 decel valves as I rip them out. What shop did you take it to??

Sounds like a couple of things are going on related to the FI and the Djet is tricky to tune the idle right.

I also run a 13lb flywheel so that is not a problem.

So thats where Martins car went, cool
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smooth_eddy
post Jul 11 2005, 08:43 AM
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Thanks for the offer Geoff....I sent you a PM. Eddy (IMG:http://www.914world.com/bbs2/html/emoticons/rolleyes.gif)
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