 '70 D-jet runs terrible cold, great when warm,, Please share your wisdom |
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| Porsche Rescue |
 Sep 9 2008, 03:45 PM
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Saving and Enjoying Old Porsches  Group: Members Posts: 2,978 Joined: 31-December 02 From: Bend, Oregon Member No.: 64 Region Association: None  |
Car starts when cold (not quickly, but it does start, air temp. 80 degrees), then it is a bitch to keep it going. Once on the road and warmed up it performs beautifully.
I have checked the Aux. Air Valve and it is sucking when cold, plugged when hot. I replaced the head temp sensor even though the old one tested OK. The new one helped a little, but not near enough. I have studied Brad Anders' site and can't come up with any other ideas of what to check. I have to believe the ignition system is fine because it runs so well when warm. I have checked timing and dwell and they are on spec. Any suggestions out there? |
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| r_towle |
Sep 9 2008, 07:01 PM
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Custom Member Group: Members Posts: 24,680 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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the spare ECU is a 2.0 liter ecu, but from what I have read its just a renumbered 1.7 ECU that needs the 270 ohm resistor.
How do your plugs look? Rich |
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| orange914 |
Sep 9 2008, 08:22 PM
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#3
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http://5starmediaworks.com/index.html Group: Members Posts: 3,371 Joined: 26-March 05 From: Ceres, California Member No.: 3,818 Region Association: Northern California |
QUOTE(r_towle @ Sep 9 2008, 06:01 PM)  the spare ECU is a 2.0 liter ecu, but from what I have read its just a renumbered 1.7 ECU that needs the 270 ohm resistor. How do your plugs look? Rich rich is right. 73 2.0 used the same ecu as 1.7. they just added a 270 ohm resister to the cht inline. i thought about adapting my 73 ecu when i went to the 2056 (from 1.7), but located a 75-76 2.0 ecu (052 i believe). it has some great advantages like a fuel shut down at decel that not only helps mileage but saves fuel. not suposed to effect power either. i haven't had a chance to confirm any of that yet on the new motor due to just breaking a c.v. (IMG:style_emoticons/default/barf.gif) . i do know it's an amazing power difference but that could be attributed to most everything else (IMG:style_emoticons/default/confused24.gif) mike |
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Posts in this topic
Porsche Rescue '70 D-jet runs terrible cold, great when warm, Sep 9 2008, 03:45 PM
Bartlett 914 Make sure you have the correct CHT and the Correct... Sep 9 2008, 04:36 PM r_towle you could add the 270 Ohm resistor to your CHT lin... Sep 9 2008, 04:54 PM Porsche Rescue Thanks Mark and Rich. Anders mentions the resistor... Sep 9 2008, 06:12 PM Porsche Rescue I will do some ECU checking on Thursday. No time t... Sep 9 2008, 08:40 PM
Porsche Rescue Took a week, but finally made time to do some more... Sep 19 2008, 03:08 PM Rand Tweaking with resistors is cool and all, but it... Sep 19 2008, 03:32 PM Porsche Rescue My instinct is the same as yours, something else m... Sep 19 2008, 03:57 PM Rav914 CSV? Sep 19 2008, 04:07 PM Porsche Rescue As I understand, CSV only injects at low temp (50 ... Sep 19 2008, 04:12 PM mattillac bad MPS? sticky decel. valve? the AAR might work o... Sep 19 2008, 04:39 PM Rand CSV isn't kicking in at his ambient temps. Dec... Sep 19 2008, 04:48 PM toon1 Does the car back fire on accel before it's wa... Sep 19 2008, 05:40 PM mattillac could this be a bad TPS or need TPS adustment? ano... Sep 19 2008, 07:09 PM Rav914 Didn't know that about the CSV. Subscribed. ... Sep 19 2008, 11:06 PM toon1
could this be a bad TPS or need TPS adustment? an... Sep 20 2008, 12:32 AM Porsche Rescue All who offered help last fall, please see my post... Feb 7 2009, 02:43 PM orange914
All who offered help last fall, please see my pos... Feb 7 2009, 03:32 PM r_towle I will run down the issues that it could be.
The ... Feb 7 2009, 04:05 PM r_towle TPS pic at Idle with flapper closed on throttle bo... Feb 7 2009, 04:08 PM r_towle One more thing
Fuel pressure and new fuel filter.... Feb 7 2009, 04:11 PM Porsche Rescue It pains me to write this..........and Rich Towle,... May 30 2009, 05:54 PM Bleyseng I don't know, its just that if the valves are ... May 31 2009, 09:14 AM |
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