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Registered
Join Date: Feb 2002
Location: Montana
Posts: 715
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running issue
So I'm having some issues with my '82 930. Originally I had the bouncing tach issue, so I had the alternator rebuilt and put in a new battery (the battery needed replaced a while ago). I also checked and cleaned grounds. That seemed to be an improvement; however, now the issue is a jumping idle, it'll drop about 200 rpm then jump 400 rpm. When it jumps the engine seems to sound labored. While driving the AFR is richer somewhere between .5-.75 richer. Fuel pumps are about 3 years old; Leask WUR, MSD CDI & coil, plug wires, rebuilt distributor are about 10 years old. I think the spark plugs are 5 years old.
I put about 2-3,000 miles a year on the car (short summers here in Montana) Any ideas before I get into trouble shooting? I'll start checking the normal stuff but thought I'd check with the group to see if anyone has experienced something like this before. Thanks, Frank
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1982 930, K-27, BL adj. WUR, Rarlyl8 Headers and Hooligan muffler, PK CDI, 22 and 30mm torsion bars, poly bronze bushings 30mm raised spindles and custom valved Bilstein shocks (by Elephant Racing), monoballs front and rear (by Rennline), Alton 17" Fuchs, Fred Cook fuse panel |
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10-01-2023, 08:00 AM
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Hi Frank, I would check the coil next, then report back.
Best of luck, Rahl
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1976 930 turbo Carrera, "Ubich". Mostly stock, lightly sweetened. She’s an angry schwierigkeit. She doesn’t want flowers, she just wants to dance! And when she does, she shakes her hips to the rythem of the road. Drive her like you hate her! |
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10-03-2023, 09:17 AM
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Registered
Join Date: Feb 2002
Location: Montana
Posts: 715
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So it took a little while to check things out. Here's what I've done. Checked coil and it checked out good. I checked out the ignition system, the rotor and cap looked good. I changed spark plugs from Bosch to Denso Iridium IW24 (based on recommendations on the board). It seems to have solved the issue based on a quick test drive to town and back; however, I now seem to be running rich by about a full point. Would new plugs cause the AFR to read rich? My ability to trouble shoot then drive is coming to an end for the season here in Montana. The last time the car seemed to start running rich I had a fuel pump failure.
Thoughts?
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1982 930, K-27, BL adj. WUR, Rarlyl8 Headers and Hooligan muffler, PK CDI, 22 and 30mm torsion bars, poly bronze bushings 30mm raised spindles and custom valved Bilstein shocks (by Elephant Racing), monoballs front and rear (by Rennline), Alton 17" Fuchs, Fred Cook fuse panel |
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11-19-2023, 10:59 AM
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That sounds like a generaly rich engine. The WUR pressures should be checked. And the idle mix.
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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11-24-2023, 11:47 PM
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1976 Porsche 930
