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Intermitent loss of power and running very hot
Hi All,
1978 911SC OK, so went for a ride on Sunday. Lately, the car has no power whatsoever until it is fully warmed up. Will not react to pressing on the gas pedal and almost stall until warmed up. Once it is warmed up, it seems to run OK. It will run very hot but OK. Then intermittently it will lose power. Then all of a sudden it goes away again. One other thing to note. After the car is warm, if you stop at a store for a minute and turn the car off, it will not have any power when you start it back up again until it runs for a few minutes. Any ideas what to check? Thanks for your help. Mike |
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08-13-2014, 05:09 AM
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Registered User
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bump....anyone?
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08-13-2014, 07:51 AM
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76 911S Targa
Join Date: Oct 2010
Location: Idaho
Posts: 1,150
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I had this happen on a VW years ago. The spark was not advancing. Retarded timing makes engine unresponsive and run hot. If you have a timing light, check the timing and see if your distributor is advancing as it should. Just a thought. I am not sure about this but since no one else has responded, that's my two cents.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods. |
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08-13-2014, 08:21 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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timing is a good place to start. could be sticking.
then i would look at control pressures. actually i would still look at these. could be your cold running issue
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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08-13-2014, 08:24 AM
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ROW '78 911 Targa
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Timing or running really lean.
Check timing and fuel system pressures as previously mentioned. You can check distributor advance isn't locked up by rotating the rotor a little and it should snap back.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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08-13-2014, 08:57 AM
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Registered User
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Thanks Guy's, I will check it out
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08-13-2014, 09:45 AM
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Registered
Join Date: Mar 2001
Location: Marysville Wa.
Posts: 22,481
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the hot start thing is residual pressure bleed-down. put on a later model SC larger accumulator and a new fuel pump check valve. you can do a quick check for residual pressure simply by removing the air filter cover and lifting up the sensor plate arm to feel if it has pressure on it or not. should feel like lifting a pound or thereabouts. or it will have nothing. gauges are the normal way.
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https://www.instagram.com/johnwalker8704 8009 103rd pl ne Marysville Wa 98270 206 637 4071 |
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08-13-2014, 01:36 PM
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Registered User
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Update: Checked all things that were suggested. All looked good.
I then checked the decel valve. I loosened the lock nut and turned the stem 1/4 of a turn counter clockwise. The car is running like a dream. Thanks all for your help. |
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08-14-2014, 05:26 AM
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Lil Red
Heinz
