 3.2l conversion died on a ride, appears I have an electrical problem, success! |
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| jim912928 |
 Sep 13 2023, 04:32 PM
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#21
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Senior Member  Group: Members Posts: 1,487 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest  |
Root…when I did the Y jumper the fuel pump did run.
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| ClayPerrine |
Sep 14 2023, 05:42 AM
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#22
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Life's been good to me so far..... Group: Admin Posts: 16,312 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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QUOTE(r_towle @ Sep 12 2023, 10:16 PM)  QUOTE(arbitrary @ Sep 12 2023, 10:25 PM) QUOTE(jim912928 @ Sep 12 2023, 11:33 PM) Ok, I jumpered 30 (always hot), to 87 and 87b and the fuel pump runs. Not sure if the car should start or not (it didn’t) but at least I know the fuel pump is good, the relay is bad. Ordering up 2 tonight. I’m not certain this proves that the relay is the problem. The DME relay only powers the fuel pump when the DME senses the engine rotating; you could still have a sensor issue. (IMG:style_emoticons/default/agree.gif) With DME, if the ECU sees the engine turning from the sensors, it turns on the ignition, the fuel injectors and the fuel pump. If you have spark, then It is probably the fuel pump side of the DME relay. Plug the DME relay back in, and see if you have spark. |
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| jim912928 |
Sep 18 2023, 04:43 PM
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#23
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Senior Member Group: Members Posts: 1,487 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
Finally got back to this. Found reference video on testing ohms and voltage. Reference sensor reads fine, speed sensor appears dead. I also get no tach bounce when cranking.
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| ClayPerrine |
Sep 18 2023, 05:25 PM
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#24
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Life's been good to me so far..... Group: Admin Posts: 16,312 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(jim912928 @ Sep 18 2023, 05:43 PM) Finally got back to this. Found reference video on testing ohms and voltage. Reference sensor reads fine, speed sensor appears dead. I also get no tach bounce when cranking. That is a common failure for the 3.2 911 engine. The sensor is not hard to replace, but you will have to do it from underneath. (IMG:http://www.914world.com/bbs2/uploads_offsite/forums.pelicanparts.com-1143-1695079500.1.jpg) I would also suggest that you replace both sensors. That way you don't have to go back next week to replace the other one. You should be able to just pull the sensors out of the mount and replace them. The sensor gap should be OK after the replacement. Otherwise you have to pull the transmission to set the sensor gap. Good Luck! |
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| jim912928 |
Sep 18 2023, 07:59 PM
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#25
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Senior Member Group: Members Posts: 1,487 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
Thanks Clay!
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| porschetub |
Sep 19 2023, 07:22 PM
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#26
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Advanced Member Group: Members Posts: 4,816 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(jim912928 @ Sep 19 2023, 01:59 PM) Thanks Clay! (IMG:style_emoticons/default/agree.gif) I had the speed sensor fail after engine swap from 2.5 to 2.7 944,danced around doing (IMG:style_emoticons/default/aktion035.gif) (IMG:style_emoticons/default/aktion035.gif) (IMG:style_emoticons/default/aktion035.gif) when it first ran real nice , long night so off to bed ,next day no start and no tach bounce so had a fair idea as I did have issues when the car had the 2.5,chucked in a spare and happy camper ran nice . If one craps out the engine has no input on flywheel position or no input for when to fire so both need to be ok, shop around for these as the prices vary a lot . Good luck . |
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| porschetub |
Sep 20 2023, 01:37 PM
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#27
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Advanced Member Group: Members Posts: 4,816 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Sorry 2 x post
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| jim912928 |
Oct 9 2023, 03:48 PM
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#28
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Senior Member Group: Members Posts: 1,487 Joined: 8-January 04 From: Granger, IN Member No.: 1,536 Region Association: Upper MidWest |
Success! I replaced both reference sensors and it fired up immediately. Also got a new dme relay…old one still worked so I’ll use the old one as a spare. These were a pain to replace. One was frozen in (speed) so I had to remove the entire assembly and re-gap. Also tight on top to get everything unplugged, had to remove heater blower etc. in all, it took me about 8 hours from start to finish.
Just got back from a long spirited drive! Thanks all for your help! |
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| ConeDodger |
Oct 10 2023, 10:31 AM
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#29
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Apex killer! Group: Members Posts: 24,025 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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QUOTE(Justinp71 @ Sep 12 2023, 11:04 AM) Why I stick with carbs... (IMG:style_emoticons/default/smile.gif). No in all seriousness I am working on switching to EFI but the extra electrical makes me nervous. Said the electrical engineer! (IMG:style_emoticons/default/lol-2.gif) |
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