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mgatlag
Joined: 02 Aug 2007
Posts: 647
Location: Avon, IN
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 Posted: Mon Mar 17, 2008 11:28 pm Post subject: been running great, won't start today... |
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Well it's not supposed to rain today so I thought I'd get the 924 out of storage and drive it today but she had other plans...
Normally when I start it, it fires right up and warms up in a few minutes. Today, however, no dice. It fired up and immediately revved up to about 3000 rpm and then died. I tried several more times and almost got it to stay on but it was idling so rough, I thought the engine was going to vibrate out of the engine compartment and fall out. It's never done this. And I mean the engine REALLY was vibrating! I even heard a few bursts of air that sounded like I have NOS and the lines were purging! WTF!!! That only happened 2 times while trying to start though. Needless to say, it stayed in the garage for today. Any suggestions? WUR, injectors, accumulators are all new and never had problems since they were replaced. I've done fuel test recently and all was well, but something is definitely wrong now.... 
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Michael
'77 1/2 924 N/A- 5 speed Audi box
'04 Ford Taurus - gone!!
'92 Jeep Cherokee Laredo - gone!!
Porsche... better than tea with Miss McGill
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924RACR
Joined: 29 Jul 2001
Posts: 9126
Location: Royal Oak, MI, USA
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| Posted: Tue Mar 18, 2008 12:37 am Post subject: |
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Condensation in the distributor cap causing misfires?
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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mgatlag
Joined: 02 Aug 2007
Posts: 647
Location: Avon, IN
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| Posted: Tue Mar 18, 2008 1:01 am Post subject: |
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Never thought of that one. If this is the case, is this normal? And what is the remedy or prevention? I have noticed that when I start the car after sitting for a week or so, moisture does spit out the tailpipe at first start up.
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Michael
'77 1/2 924 N/A- 5 speed Audi box
'04 Ford Taurus - gone!!
'92 Jeep Cherokee Laredo - gone!!
Porsche... better than tea with Miss McGill
(Slap Shot) |
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924RACR
Joined: 29 Jul 2001
Posts: 9126
Location: Royal Oak, MI, USA
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| Posted: Tue Mar 18, 2008 1:53 am Post subject: |
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Not all that common - maybe you should stop storing it in the boathouse? 
Did that fix it?
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Tue Mar 18, 2008 2:04 am Post subject: |
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| mgatlag wrote: | | And what is the remedy or prevention? |
A light misting of WD40 inside the cap can help this issue.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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mgatlag
Joined: 02 Aug 2007
Posts: 647
Location: Avon, IN
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| Posted: Tue Mar 18, 2008 2:36 am Post subject: |
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Sorry Vaughan but the only thing in the garage is the 924. The 28' cuddy cabin Sea Ray and 67 427 Cobra sit outside all year around, uncovered. I do have my priorities! I'm bored at work today so I think I'll take off the afternoon and play with the 924. I'll try misting some WD40 like Rasta said. This hasn't happened with the car yet, I'm hoping this isn't going to start a trend each time I want to get her out. If this doesn't work, I guess I'll have to start with a fuel flow test and injector spray test and see where that gets me. If you see a big ball of flame from Indy, assume I did something wrong!
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Michael
'77 1/2 924 N/A- 5 speed Audi box
'04 Ford Taurus - gone!!
'92 Jeep Cherokee Laredo - gone!!
Porsche... better than tea with Miss McGill
(Slap Shot) |
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PORSCHEV
Joined: 02 Nov 2002
Posts: 1901
Location: Cedar Lake Nova Scotia, Canada
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| Posted: Tue Mar 18, 2008 3:11 am Post subject: |
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I would also inspect the timing belt. Might have jumped a tooth if it getting worn and dried out.
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1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.
1978-#53 "D" track racer. |
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mgatlag
Joined: 02 Aug 2007
Posts: 647
Location: Avon, IN
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| Posted: Tue Mar 18, 2008 8:16 am Post subject: |
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Think I figured it out. There was a hose coming off the back of the intake manifold that didn't have a hose clamp and came loose enough to create a vac leak. The burst of air I heard must have been the hose blowing off cuz as soon as I reattached it, it fired right up and ran good. I guess there was more air going thru that hose that I thought. Wish they were all that easy. I did spray some WD40 in the cap and it seemed to start better than normal when the engine is cold.
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Michael
'77 1/2 924 N/A- 5 speed Audi box
'04 Ford Taurus - gone!!
'92 Jeep Cherokee Laredo - gone!!
Porsche... better than tea with Miss McGill
(Slap Shot) |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Tue Mar 18, 2008 6:16 pm Post subject: |
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| 924RACR wrote: | | Condensation in the distributor cap causing misfires? |
| mgatlag wrote: | | Never thought of that one. If this is the case, is this normal? |
| 924RACR wrote: | | Not all that common |
...unless you live in the damp UK climate!
Here, it's the number one reason for cars not starting!
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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