 Fuel Problem?, Need Diagnostic Help |
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| Jim C |
 Jan 15 2023, 12:23 PM
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Member  Group: Members Posts: 192 Joined: 11-July 19 From: Texas Member No.: 23,294 Region Association: Southwest Region 
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I left on a 200 + mile drive yesterday morning with other aircooled Porsches. As usual the D jet equipped '76 2.0 was running beautifully. Until I got within 10 miles of home. At that point the engine tone changed and I experienced small backfires occasionally. At idle I could also hear a low moaning sound inside the car on the left side. Besides running rough, although with good acceleration, there was black smoke and lots of carbon in the tailpipe and the smell of fuel in the exhaust. I thought exhaust leak maybe, but when I put my hand over the tailpipe the engine stopped. The car has had extensive work: FIs cleaned and checked in 2019, rebuilt MPS 2020, ECU tested and functioning, new CHT 2022, Bowlsby engine harness 2022, 123 distributor 2021, all vacuum lines replaced, AFM adjusted 2022. She will start as normal and run, although roughly.
Fuel pump perhaps? |
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Posts in this topic
Jim C Fuel Problem? Jan 15 2023, 12:23 PM
brant Black smoke and the smell of fuel would make me th... Jan 15 2023, 12:40 PM mgphoto MPS diaphragm cracked, check if it holds vacuum. Jan 15 2023, 01:02 PM
JeffBowlsby
MPS diaphragm cracked, check if it holds vacuum.
... Jan 15 2023, 03:21 PM Lockwodo
I left on a 200 + mile drive yesterday morning wi... Jan 15 2023, 02:50 PM Jim C No animals were harmed or ingested. Could the nois... Jan 15 2023, 05:39 PM ChrisFoley Could be a failed fuel pressure regulator Jan 15 2023, 07:01 PM emerygt350 Check the plugs first to see if it is cylinder spe... Jan 15 2023, 07:49 PM Rikyrat On my first 914, I am on my third, I had a similar... Jan 16 2023, 11:15 AM emerygt350 Djet, so no flap. Jan 16 2023, 11:32 AM brant Do a valve adjustment
Might be both symptoms Jan 16 2023, 02:02 PM emerygt350 Afm adjusted? Djet? Wait, what? Jan 16 2023, 08:13 PM Jim C Still have decel valve installed. I have a vacuum ... Jan 17 2023, 07:57 AM Superhawk996 Just for fun, go check the CHT sensor - aftermarke... Jan 17 2023, 08:14 AM Jim C
Just for fun, go check the CHT sensor - aftermark... Jan 17 2023, 08:22 AM Jim C CHT checks out. MPS has no vacuum, so I guess it i... Jan 17 2023, 04:25 PM GregAmy
CHT checks out. MPS has no vacuum, so I guess it ... Jan 17 2023, 04:54 PM brant so your running extremely rich
most people can not... Jan 17 2023, 04:31 PM Dave_Darling @JeffBowlsby , above, sometimes will calibrate a b... Jan 17 2023, 04:53 PM bzettner @JeffBowlsby will rebuild your MPS for you also... Jan 17 2023, 09:46 PM Jim C Thank you all. Jan 18 2023, 08:40 AM bzettner http://www.914world.com/bbs2/index.php?showtopic=3... Jan 19 2023, 05:54 PM 914Sixer Sold and shipped today. Jan 19 2023, 06:54 PM  |
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