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Registered
Join Date: Dec 2001
Posts: 132
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What would you do next?
1981 911SC (104,000 miles)
work just done: New cat. converter (old one rotted & cracked) New O2 sensor New Plugs New Megacor wires New dist. cap & rotor Adjusted timing. Now the Pcar runs poorly when cold. After its been run for awhile its like a different car. Smooth and ideling niceyly. Complaint is that it appears to bog down on initial acceleration and the power peak seems to have risin to over 4000rpms. It just does not have the crisp power it did before. So, what would you check & do next? Tx! John |
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02-04-2003, 03:00 PM
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Join Date: Sep 2002
Posts: 3,580
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Have you checked the mixture and Warm Up Regulator?
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02-04-2003, 03:07 PM
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Join Date: Nov 2002
Posts: 1,955
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Definately check the WUR.
Also check the controls pressures when warm and cold. |
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02-04-2003, 03:09 PM
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Registered
Join Date: Dec 2001
Posts: 132
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thanks what do you refer to when you say "Controls pressures"?
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02-04-2003, 03:12 PM
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Fuel Control Pressure
John,
You need a fuel injection (CIS) gauge kit to measure your fuel pressures. This kit is available from J.C. Whitney ($60) and very useful for trouble shooting CIS system. You need to know the pressure before and after the WUR (cold & warm) to be able to diagnose the problem causing your erractic engine performance. This fuel gauge kit also helps you determine the delivery pressure of your fuel pump. Just my two-cents...... |
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02-04-2003, 07:34 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Get a CIS test from JC Whitney (why doesn't Wayne have this at the same price?) and read this thread:
close, but no cigar |
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02-04-2003, 07:37 PM
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Somewhere in the Midwest
Join Date: Oct 2001
Location: In the barn!
Posts: 12,499
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Note: your full advance will be less than the 78-79 SC motor..maybe 29 degrees max. I'll have to check the factory spec for full advance, but others will chime in, I'm sure.
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02-04-2003, 07:41 PM
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Adjusted timing to what? 29-32 degrees total at 6000rpm, 5-10 at idle would be ideal. I run an MSD timing computer with no vacuum or mechnical advance only the computer to control timing I'm set for 14 at idle and 32 at 6000rpm any less and I get a hestitation in the lowend. Make sure the mechanical and vacuum advance units are functioning properly without sticking and that most of the timing is in by 3000rpm.
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Email me about 911 exhaust stud repair tools, rsr911@neo.rr.com 1966 912 converted to 3.0 and IROC body SOLD unfortunately  1986 Ford F350 Crew Cab 7.3 IDI diesel, Banks Sidewinder turbo, ZF5 5spd, 4WD Dana 60 king pin front, DRW, pintle hook and receiver hitch, all steel flat bed with gooseneck hidden hitch. Awesome towing capacity! |
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02-04-2003, 09:15 PM
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1966 Porsche 912 1981 3.0SC
