 Mystery connection, don't know what plugs into this, have a look |
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| jackspratt |
 Feb 27 2022, 10:22 PM
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#1
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Member  Group: Members Posts: 55 Joined: 5-February 22 From: Canada Member No.: 26,315 Region Association: Pacific Northwest 
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Wondering what this would have plugged into it. Looks like it's a ground of some sort and looks stock? Anyone have a clue? 1973 914 2.0
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| JeffBowlsby |
Feb 27 2022, 10:29 PM
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#2
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914 Wiring Harnesses Group: Members Posts: 8,548 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Thats the heater fan ground for a 1970-72 914. Is your engine original to the 1973 chassis?
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| jackspratt |
Feb 27 2022, 10:58 PM
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#3
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Member Group: Members Posts: 55 Joined: 5-February 22 From: Canada Member No.: 26,315 Region Association: Pacific Northwest
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QUOTE(JeffBowlsby @ Feb 27 2022, 08:29 PM)  Thats the heater fan ground for a 1970-72 914. Is your engine original to the 1973 chassis? The engine code is GA000744 And have no idea if original or not but looks like it was never out of the car. What do you think and much thanks for solving this. I just got this project that was left around for years. I'm still trying to figure out the vacuum hoses which this 1973 seems to have 1/2 73 and 1/2 74? setup. It has a round air filter. Do you have any idea what this other mystery plug is for? no idea on that one either. Talking about the last picture, the one coming off of the thick ones    |
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| Rob-O |
Feb 28 2022, 08:35 AM
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#4
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Senior Member Group: Members Posts: 1,252 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region
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That one looks to be the connection for the head temperature sensor. Coming out of the engine tin on the passenger side should be a wire that leads to the head temp sensor.
Does the car still have the fuel injection? |
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| Olympic 914 |
Feb 28 2022, 09:04 AM
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#5
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Group: Members Posts: 1,679 Joined: 7-July 11 From: Pittsburgh PA Member No.: 13,287 Region Association: North East States
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My early '73 has the same tab, it never had anything connected to it.
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| ClayPerrine |
Feb 28 2022, 01:06 PM
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#6
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Life's been good to me so far..... Group: Admin Posts: 15,540 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(Olympic 914 @ Feb 28 2022, 09:04 AM) My early '73 has the same tab, it never had anything connected to it. Probably installed on the engine in 73 until someone figured out it was no longer needed. |
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| jrmdir |
Feb 28 2022, 01:24 PM
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#7
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Member Group: Members Posts: 224 Joined: 13-May 21 From: Central Ohio Member No.: 25,544 Region Association: Upper MidWest
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Yep - I have the same lug on my early '73 (9/72 build) (Original engine confirmed by Porsche.)
And I posted the same question soon after I got the car. Got some informative replies: http://www.914world.com/bbs2/index.php?sho...=354174&hl= Ron |
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| jackspratt |
Feb 28 2022, 06:01 PM
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#8
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Member Group: Members Posts: 55 Joined: 5-February 22 From: Canada Member No.: 26,315 Region Association: Pacific Northwest
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QUOTE(Rob-O @ Feb 28 2022, 06:35 AM) That one looks to be the connection for the head temperature sensor. Coming out of the engine tin on the passenger side should be a wire that leads to the head temp sensor. Does the car still have the fuel injection? Yes, it still has the fuel injection system. Not starting up though. Fuel pump seems to not be working. Can't hear anything when cranking. And I changed the relays to new ones and still nothing. Any suggestions? |
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| jackspratt |
Feb 28 2022, 06:06 PM
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#9
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Member Group: Members Posts: 55 Joined: 5-February 22 From: Canada Member No.: 26,315 Region Association: Pacific Northwest
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Well that solves that one for that rogue plug in. Nothing goes there
Thanks |
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| emerygt350 |
Feb 28 2022, 07:26 PM
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#10
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Advanced Member Group: Members Posts: 2,152 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Yeah same here on the rogue plug. I have actually run that first ground tab to the battery on mine to improve the engine grounding on the fan shroud. Aluminum is not the best conductor and I saw a notible drop in resistance to ground when I was troubleshooting charging issues.
Give us a full picture of your engine. Show us the heads too, around the injectors/plugs. |
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| mate914 |
Mar 1 2022, 07:13 AM
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#11
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Matt Group: Members Posts: 760 Joined: 27-February 09 From: Eagles mere, PA Member No.: 10,102 Region Association: North East States
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aaah ground?
QUOTE(jackspratt @ Feb 27 2022, 11:22 PM) Wondering what this would have plugged into it. Looks like it's a ground of some sort and looks stock? Anyone have a clue? 1973 914 2.0 |
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| JamesM |
Mar 1 2022, 12:05 PM
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#12
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Senior Member Group: Members Posts: 1,922 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
QUOTE(jackspratt @ Feb 27 2022, 09:58 PM) The engine code is GA000744 And have no idea if original or not but looks like it was never out of the car. What do you think and much thanks for solving this. I just got this project that was left around for years. I'm still trying to figure out the vacuum hoses which this 1973 seems to have 1/2 73 and 1/2 74? setup. It has a round air filter. Do you have any idea what this other mystery plug is for? no idea on that one either. Talking about the last picture, the one coming off of the thick ones You have a 2.0 engine case and 1.7 heads and injection system. I think all bets are off as far as originality. |
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| emerygt350 |
Mar 1 2022, 12:30 PM
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#13
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Advanced Member Group: Members Posts: 2,152 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
QUOTE(JamesM @ Mar 1 2022, 01:05 PM) QUOTE(jackspratt @ Feb 27 2022, 09:58 PM) The engine code is GA000744 And have no idea if original or not but looks like it was never out of the car. What do you think and much thanks for solving this. I just got this project that was left around for years. I'm still trying to figure out the vacuum hoses which this 1973 seems to have 1/2 73 and 1/2 74? setup. It has a round air filter. Do you have any idea what this other mystery plug is for? no idea on that one either. Talking about the last picture, the one coming off of the thick ones You have a 2.0 engine case and 1.7 heads and injection system. I think all bets are off as far as originality. We haven't seen the heads yet... It could be quite a frankenstien. Or simply a strange mix of djet components. From the pics it looks like you need some help routing the crankcase ventilation as well... Get us those pictures of the heads and engine! |
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| JamesM |
Mar 1 2022, 01:43 PM
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#14
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Senior Member Group: Members Posts: 1,922 Joined: 6-April 06 From: Kearns, UT Member No.: 5,834 Region Association: Intermountain Region |
QUOTE(emerygt350 @ Mar 1 2022, 11:30 AM) QUOTE(JamesM @ Mar 1 2022, 01:05 PM) QUOTE(jackspratt @ Feb 27 2022, 09:58 PM) The engine code is GA000744 And have no idea if original or not but looks like it was never out of the car. What do you think and much thanks for solving this. I just got this project that was left around for years. I'm still trying to figure out the vacuum hoses which this 1973 seems to have 1/2 73 and 1/2 74? setup. It has a round air filter. Do you have any idea what this other mystery plug is for? no idea on that one either. Talking about the last picture, the one coming off of the thick ones You have a 2.0 engine case and 1.7 heads and injection system. I think all bets are off as far as originality. We haven't seen the heads yet... It could be quite a frankenstien. Or simply a strange mix of djet components. From the pics it looks like you need some help routing the crankcase ventilation as well... Get us those pictures of the heads and engine! You can see the spark plug angle in the pic, they are not 2.0 914 heads. Leaves a lot of questions as to what the bottom end is made up of. |
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| Dustin |
Mar 1 2022, 05:26 PM
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#15
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Member Group: Members Posts: 111 Joined: 19-August 10 From: Woodland Hills, CA Member No.: 12,072 Region Association: None |
In the 70s and 80s when the engines started running poorly in these cars they would take it out and just throw a rebuilt engine in. Less than a days work. Then the shop would rebuild the one they took out and throw it in something else. The numbers on the case don't really mean very much other than that was originally in a 2.0. But, who knows what is in the case now. There were a whole lot of these cases produced. They weren't considered anything special for many years. Shops back then were just about getting the car back on the road. Not purity so much.
2.0s and 1.7s have different parts in the case. Connecting rods and crank and cam shaft. 2.0s also have a windage tray. Hopefully you have 2.0 parts in the case. Your fuel injection is from a 1.7. Any time you see a connector like this one that is just attached to the fan shroud and engine case and transmission and chassis, it's just a ground. |
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| emerygt350 |
Mar 2 2022, 03:13 PM
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#16
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Advanced Member Group: Members Posts: 2,152 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
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Ahh yes, up on the driver side, now I see it. Interesting. So 1.7 top end. Can you read the number off the injectors? That could tell us the current displacement. |
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| forrestkhaag |
Mar 2 2022, 03:31 PM
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#17
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Senior Member Group: Members Posts: 935 Joined: 21-April 14 From: Scottsdale, Arizona Member No.: 17,273 Region Association: Southwest Region |
As for the lug, I remember reading somewheere in R&T back in the late 70's that the factory placed that plug there for a convenient ground lug for one's timing light. Maybe...
My 71 1.7 had the lug original to the car.... (IMG:style_emoticons/default/beerchug.gif) |
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| jackspratt |
Mar 3 2022, 02:36 PM
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#18
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Member Group: Members Posts: 55 Joined: 5-February 22 From: Canada Member No.: 26,315 Region Association: Pacific Northwest
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Well, here are a few more engine pics. The injector was yellow in color when I removed a boot. Underneath it seems the PO had done some stuff. The heads look clean, new oil filter? push rod tubes not leaking? Who knows?
Question, got the fuel pump running by knocking on it with a hammer. This was after I went out and got new relays and tried them and still no fuel pump. So, I put the old ones back in and read an article to give the fuel pump a few knocks with a hammer, did that and it started running LOL! But there is no fuel getting to the cylinders I think? I took out a spark plug and no smell of gas. I have spark from coil to distributor to plugs. Any suggestions? Fuel filter was flowing when I undid a line to see if fuel was coming out. ??? So, cranking over now, pump running but no fuel to cylinders Attached image(s)       
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| jrmdir |
Mar 3 2022, 02:53 PM
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#19
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Member Group: Members Posts: 224 Joined: 13-May 21 From: Central Ohio Member No.: 25,544 Region Association: Upper MidWest
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I don't have a good answer but after having spent months trying to breath life back into a a long-dormant engine, I found it invaluable to get a cheap (Harbor Freight) fuel pressure gauge and hook it up to the test port between injectors 1 and 2. I eventually made it semi-permanent by zip tying it to the rear firewall and referenced it a lot when I was having drivability issues.
If you have pressure (spec is 28-29 psi) then I suppose all of the injectors could be plugged but that would seem unusual. More likely it has to do with the trigger points in the distributor or the ECU not firing. A lot of threads on this. Ron |
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| jrmdir |
Mar 3 2022, 03:06 PM
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#20
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Member Group: Members Posts: 224 Joined: 13-May 21 From: Central Ohio Member No.: 25,544 Region Association: Upper MidWest
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Further thoughts. If not already, you will no doubt find your way to this site:
https://members.rennlist.com/pbanders/DJetParts.htm If it turns out that you have pressure I'd start with the electrical ECU test checklist (Step 10) This will verify if pulses are coming into the ECU from the trigger points and also if there is good connectivity from the ECU connector to the injectors. Also make sure to check the injector wire ground lug near the throttle body. Good luck! Ron |
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